GB 50205-2001 Translated English of Chinese Standard: GB 50205-2001 www.ChineseStandard.net Email: Sales@ChineseStandard.net National Standard of the People's Republic of China GB UDC GB 50205-2001 P Code for Acceptance of Construction Quality of Steel Structures 钢结构工程施工质量验收规范 Some pages are intentionally removed. Please purchase a full copy from: www.ChineseStandard.net Issued on: January 10, 2002 Implemented on: March 1, 2002 Jointly issued by: Ministry of Construction of the People's Republic of China; General Administration for Quality Supervision and Inspection and Quarantine of the People's Republic of China. www.ChineseStandard.net Page 1 of 99 GB 50205-2001 National Standard of the People's Republic of China Code for Acceptance of Construction Quality of Steel Structures Compiled by: Ministry of Construction of the People's Republic of China. Approved by: Ministry of Construction of the People's Republic of China. Implemented on: March 1, 2002 GB 50205-2001 www.ChineseStandard.net Page 2 of 99 GB 50205-2001 Notice on the Issue of the State Standard of the Code of Acceptance of Construction Quality of Steel Structures J.B. [2002] NO. 11 According to the requirements of the Notice on the Issue of the Plan of Preparing and Revising the Construction Standards during 2000 - 2001 (JB [2001] No. 87), the Code of Acceptance of Construction Quality of Steel Structures was jointly compiled by the General Architecture Research Institute of Metallurgy Ministry and other related organizations. It has been reviewed by the related departments and approved to be the national standard. The number is GB 50205-2001. This Code will be put in force on March 1, 2002. In which, the mandatory clauses include 4.2.1, 4.3.1, 4.4.1, 5.2.2, 5.2.4, 6.3.1, 8.3.1, 10.3.4, 11.3.5, 12.3.4, 14.2.2 and 14.3.3. They must be executed strictly. At the same time, the previous versions of the Code of Acceptance of Construction Quality of Steel Structures (GB 50205-95) and the Standard of Inspection and Assesment of Construction Quality of Steel Structures (GB 50221-95) shall be abolished. The Construction Ministry shall be responsible for the administration of this Code and the interpretation of the mandatory clauses in this Code. The General Architecture Research Institute of Metallurgy Ministry shall be responsible for the interpretation of the specific technical content. The issue and publication of this Code shall be jointly by the Standard & Norm Institute of Construction Ministry and the China Planning Publishing House. The Construction Ministry Ministry of Construction of the People's Republic of China January 10, 2002 www.ChineseStandard.net Page 3 of 99 GB 50205-2001 Preface This Code was compiled by revising the Code of Acceptance of Construction Quality of Steel Structures (GB 50205-95) and the Standard of Inspection and Assesment of Construction Quality of Steel Structures (GB 50221-95). It was jointly drafted by the General Architecture Research Institute of Metallurgy Ministry and other related organizations, according to the Notice on the Issue of the Plan of Preparing and Revising the Construction Standards during 2000 - 2001 (JB [2001] No. 87). During the revision, the team responsible for the compilation have carried out extensive surveys; summarized the practical experiences on the acceptance of construction quality of steel structures in China; taken the current version of the state standard of the Uniform Standard of Acceptance of Construction Quality of Steel Structures (GB 50300) as the basis and revised it holistically according to the approach of "Separate the test and evaluation; strengthen the acceptance; enhance the means and process control"; widely solicited the views and opinions, in various ways, from the relevant organizations of the country; and modified the main issues repeatedly, so as the approval-version is finalized. This code is divided into 15 chapters, including General, Terms, Symbols, Basic Requirements, Admittance of Raw Materials and Finished Products, Welding Work, Connection Work of Fasteners, Processing Work of Steel Parts and Copper Components, Assembly Work of Steel Elements, Test Assembling Work of Steel Elements, Installation Work of Single-layer Steel Elements, Installation Work of Multilayer or High Steel Elements, Installation Work of Net-type Steel Structures, Preparation and Installation Work of Metal Contour Plates, Coating Work of Steel Structures, Acceptance of Subitem-works of Steel Structures, and 9 appendixes. The Work of Steel Structures is divided into 10 subitem-works in principle, which are presented in separate chapters respectively. Though the Admittance of Raw Materials and Finished Products is not one of the subitem-works, it is presented in one independent chapter, aiming at emphasizing and enhancing the importance of the admittance inspection of raw materials and finished products and therefore ensuring the construction quality by controlling the quality of the source. Additionally, the Acceptance of Subitem-works of Steel Structures is also presented in an independent chapter in order to provide further convenience for the operation of the acceptance of construction quality. This Code may be revised where necessary in the future. The information about the revision of any parts of this Code and the revised clauses will be published on the magzine Standardization of Construction. This Code’s clauses highlighted in boldface are mandatory. Main drafting organization, supporting drafting organizations, and chief drafters: Main drafting organization: www.ChineseStandard.net Page 4 of 99 GB 50205-2001 General Architecture Research Institute of Metallurgy Ministry. Supporting drafting organizations: Wuhan Steel Structures Co., Ltd; Beijing General Institute of Iron and Steel Design; China Jingye Construction Engineering Contract Yuanda Construction Supervision Company of Beijing City; Shenzhen Jianshenghe Steel Structure Construction Engineering Co, Ltd of China Construction Third Bureau; Mechanical Construction Company of Beijng City; Zhejiang Hangxiao Steel Structure Co, LTD; Steel Structure Company of China Construction First Bureau; Shandong Chucheng High Strength Fasteners Company; Zhejiang Jinggong Steelbuilding Co., LTD; Hilfi (China) Ltd. Chief drafters: Hou Zhaoxin He Fentao He Xianjuan Lu Kekuan Liu Jingfeng Cheng Guojing Yi Minda www.ChineseStandard.net Yu Zhichuo Ma Naiguang Wang Wentao He Qiaosheng Shi Jin Pao Guangjian Li Haifeng Qian Weijun Page 5 of 99 GB 50205-2001 Table of Contents 1 General ........................................................................................................................... 9 2 Terms and Symbols ..................................................................................................... 10 2.1 Terms ................................................................................................................... 10 2.2 Symbols ............................................................................................................... 10 3 Basic requirements ...................................................................................................... 12 4 Admittance of Raw Materials and Finished Products ............................................. 14 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10 5 Ordinary requirements ......................................................................................... 14 Steel materials ..................................................................................................... 14 Welding materials ................................................................................................ 15 Standard fasteners for connecting ....................................................................... 16 Weld balls ............................................................................................................ 17 Bolt balls.............................................................................................................. 17 Closing boards, flare heads, sleeves .................................................................... 18 Metal contour plates ............................................................................................ 18 Coating materials ................................................................................................. 19 Others ................................................................................................................ 20 Welding Work of Steel Structures .............................................................................. 21 5.1 Ordinary requirements ......................................................................................... 21 5.2 Welding work of steel structures ......................................................................... 21 5.3 Welding work of welding stud ............................................................................ 24 6 Connecting Work of Fasteners ................................................................................... 26 6.1 6.2 6.3 7 Processing Work of Steel Parts and Components ..................................................... 29 7.1 7.2 7.3 7.4 7.5 7.6 8 Ordinary requirements ......................................................................................... 26 Connecting of ordinary fasteners......................................................................... 26 Connecting of high strength bolts........................................................................ 27 Ordinary requirements ......................................................................................... 29 Gas cutting ........................................................................................................... 29 Connecting of high strength bolts........................................................................ 30 Processing of edges ............................................................................................. 31 Processing of pipes/ducts and balls ..................................................................... 32 Processing of Hole............................................................................................... 33 Assembling Work of Steel Elements .......................................................................... 35 8.1 Ordinary requirements ......................................................................................... 35 8.2 H-shape weldable steel ........................................................................................ 35 8.3 Assembling .......................................................................................................... 35 8.4 Milling of ends and installation of welding bevel ............................................... 36 www.ChineseStandard.net Page 6 of 99 GB 50205-2001 8.5 9 Overall dimensions of steel elements .................................................................. 36 Test Assembling of Steel Elements ............................................................................. 38 9.1 Ordinary requirements ......................................................................................... 38 9.2 Test assembling ................................................................................................... 38 10 Installation Work of Single-layer Steel Structures ................................................. 39 10.1 Ordinary requirements ....................................................................................... 39 10.2 Bases and bearing surfaces ................................................................................ 39 10.3 Installation and rectification .............................................................................. 41 11 Installation Work of Multilayer or High Steel Structures...................................... 44 11.1 Ordinary requirements ....................................................................................... 44 11.2 Bases and bearing surfaces ................................................................................ 44 11.3 Installation and rectification .............................................................................. 45 12 Installation Work of Net-type Steel Structures ....................................................... 49 12.1 Ordinary requirements ....................................................................................... 49 12.2 Tope plates of bearing surfaces and cushion blocks .......................................... 49 12.3 General Assembling and Installation ................................................................. 50 13 Preparation and Installation Work of Metal Contour Plates ................................ 53 13.1 Ordinary requirements ....................................................................................... 53 13.2 Preparation of metal contour plates ................................................................... 53 13.3 Installation of metal contour plates ................................................................... 54 14 Coating Work of Steel Structure .............................................................................. 56 14.1 14.2 14.3 15 Ordinary requirements ....................................................................................... 56 Coating of anticorrosive layer of steel structure................................................ 56 Coating of Fire-retardant Layer of Steel Structure ............................................ 57 Final Acceptance of Subitem-works of Steel Structure .......................................... 59 Appendix A Quality Standard of Appearance of Welding Seam, and Allowable Variations of Sizes of Welding Seam ................................................................................ 61 Appendix B Inspection Items of Connecting of Fastener ........................................... 63 Appendix C Allowable Variations for Assembly of Steel Structure ........................... 68 Appendix D Allowable Variations for Test Assembling of Steel Structure ................ 74 Appendix E Allowable Variations for Installation of Steel Structure ........................ 75 Appendix F Test Method for Thickness of Fire-retardant Coating Layer of Steel Structure ............................................................................................................................. 79 Appendix G Test of Safety and Functionality of Steel Structures and Test Items Needing Witness ................................................................................................................. 80 Appendix H Examination Items of Visual Sensation of Steel Structures .................. 81 www.ChineseStandard.net Page 7 of 99 GB 50205-2001 Appendix J Record Forms for Batch Quality Acceptance of Steel Structures ......... 82 Interpretation for wording of this standard.................................................................... 97 www.ChineseStandard.net Page 8 of 99 GB 50205-2001 1 General 1.01 This Code was prepared for enhancing the control of construction quality, unifying the acceptance of construction quality of steel structures, and ensuring the quality of steel structures. 1.02 This Code is applicable for the acceptance of the construction quality of various steel structures including single-layer steel structures, multilayer steel structures, high steel structures, net-type steel structures, and structures made of metal contour plates. 1.03 The requirements on the acceptance of construction quality, set forth in the technical document executed during the construction of steel structures and the contracts for undertaking the construction, shan’t be less strict than the corresponding requirements specified in this Code. 1.04 This Code is in addition to and shall not be prejudicial to the Uniform Standard of Acceptance of Construction Quality of Steel Structures (GB 50300). 1.05 During the acceptance of construction quality of steel structures, not only requirements stated in this Code shall be implemented, but also those set forth in related current state standards. www.ChineseStandard.net Page 9 of 99 GB 50205-2001 2 Terms and Symbols 2.1 Terms 2.1.1 Part Part means the smallest unit composing a component or element, such as connection plate, flange plate and etc. 2.1.2 Component Component means the unit composed of several parts, such as H-shape weldable steel, cantilever bracket and etc. 2.1.3 Element Element means the steel structure’s basic unit composed of parts or parts and components, such as beam, column/pillar, supporter and etc. 2.1.4 The smallest assembled rigid unit The smallest assembled rigid unit means the smallest installation unit, used during the installation of steel structure, other than spare parts; Ordinarily, the smallest assembled rigid units are divided to two types including plane truss and cone. 2.1.5 Intermediate assembled structure Intermediate assembled structure means the installation unit composed of spare parts and the smallest assembled rigid units, which is used during installation of steel structure and divided usually into two types including strip-shape type and block-shape type. 2.1.6 Set of high strength bolt Set of high strength bolt is the general term of high strength bolt and the nut and gasket matching the bolt. 2.1.7 Slip coefficient of faying surface Slip coefficient of faying surface means the ratio between the foreign force generating slip movement on friction surface of adapting piece and the sum of the high strength bolt’s pre-tensile forcing on the friction surface vertically. 2.1.8 Test assembling Test assembling means the assembling performed for verifying if the elements can meet the quality requirements of installation. 2.1.9 Space rigid unit Space rigid unit means the basic, stable space system composed of elements. 2.1.10 Stud welding Stud welding means a welding method described as below: 1) make one end of stud contact with the surface of one plate piece (pipe piece); 2) make power on and strike arc; 3) after the contacting surface have melted sufficiently, press the stud appropriately and then end the welding. 2.1.11 Ambient temperature Ambient temperature means the temperature of the preparation or installation site. 2.2 2.2.1 Symbols Action and action effect www.ChineseStandard.net Page 10 of 99 GB 50205-2001 P -- Design pre-tensile of high strength bolt; P -- Loss of pre-tensile of high strength bolt; T -- Test torque of high strength bolt; Tc -- Torque of completing screw of high strength bolt; To -- Torque of opening screw of high strength bolt. 2.2.2 Geometric parameter a -- Spacing interval; b -- Width or free overhang width of plate; d -- Diameter; e -- Eccentricity; f -- Flexibility, or height of arc; H -- Height of column/pillar; H i -- Height of every floor of builing; h -- Height of sectional plane; he -- Calculated thickness of leg of a fillet weld; l -- Length, or span; Ra -- Arithmetic mean deviation of overall dimensions (i.e., parameter of surface 2.2.3 roughness); r -- Semidiameter; t -- Thickness of plate or wall; Δ-- Increment; Others K -- Coefficient. www.ChineseStandard.net Page 11 of 99 GB 50205-2001 3 Basic requirements 3.01 The contractor of the construction of steel structures shall have the related qualifications for the construction of steel structures. For the onsite control of construction quality, related technical standards of construction shall be prepared and implemented; the related quality assurance system shall be operated; and the quality control and inspection regulations shall be executed. In construction site, the related construction organization plan, construction scheme and other technical documents shall be available. 3.02 The measuring instruments/apparatuses used for the acceptance of construction quality of steel structures shall be those qualified by metrological verification and calibration. 3.03 The construction quality of steel structures shall be controlled in accordance with the following requirements: 1. All raw materials and finished products to be adopted for construction shall be checked/tested and accepted before they enter construction site. Any raw material and finished product related to the safety and functionality of steel structure shall be rechecked/retested according to this Code; moreover, the sampling and delivering of samples shall be witnessed by the supervision engineer (i.e., the technical chief of client). 2. The quality of every working procedure shall be controlled according to the technical standard for construction; furthermore, every working procedure shall be checked upon their completion. 3. For the interfaces between different special kinds of work, hand-over inspection/test shall be carried out; and the inspection/test result shall be checked and accepted by the supervision engineer (i.e., the technical chief of client). 3.0.4 The acceptance of construction quality of steel structures shall be carried out separately for every inspection/test batch, subitem-work, section (subsection) of steel structure, on the basis of the self-inspection/test of construction organization/team. The division of the subitem-works of sections (subsection) of steel structure shall be performed according to the current state standard of Uniform Standard of Acceptance of Construction Quality of Steel Structures (GB 50300). For the acceptance of construction quality of steel structures, every subitem-work of steel structure shall be divided into one or several inspection/test batch(s) according to the requirements set forth in this Code. 3.0.5 For every inspection/test batch of subitem-work, the quality standard shall be in conformity with the following requirements: 1. Every main item under control shall be in conformity with the related quality standard set forth in this Code. 2. For every ordinary item, according to the inspection/test result, there the inspection/test meeting the quality requirements specified in this Code shall be over 80% and the largest value shall be less than 1.2 times of the allowable variation. 3. The records of quality inspection/test, documentary evidence of quality, and other information documents shall be in completeness. www.ChineseStandard.net Page 12 of 99 GB 50205-2001 3.06 The quality standard of subitem-work shall be in conformity with the following requirements: 1. Every inspection/test batch of subitem-work shall be in conformity with the related quality standard specified in this Code; 2. The records of the acceptance of every inspection/test batch of subitem-work shall be in completeness. 3.07 When the construction quality of steel structure isn’t in conformity with any requirement specified in this Code, the following measures shall be implemented: 1. Carry out the acceptance again for the inspection/test batch processed by reworking and replacing the unqualified element(s)/component(s); 2. Accept the inspection/test batch verified to be in conformity with the design requirements by the qualified test organization(s). 3. Accept the inspection/test batch verified to be in unconformity with the design requirements by the qualified test organization(s) but examined and calculated to be able to satisfy the requirements of safety and functionality of steel structure by the original design organization. 4. Check and accept the construction subitem-work and section reworked/repaired or reinforced, which can meet the requirements for safe use although their overall dimensions may have been changed, according to the related handling scheme and agreement(s). 3.08 It is prohibited to accept any construction section that can’t meet the requirements for safe use even after the reworking and reinforcing. www.ChineseStandard.net Page 13 of 99 GB 50205-2001 variations shall be in conformity with the requirements set forth in the related standard of such products. Quantity for inspection: inspect randomly five points for every type of section steel with same specifications. Inspection method: measure thickness with steel rulers or slide calipers. 4.2.5 The appearance quality of steel materials shall be in conformity with the following requirements besides those specified in the current state standards: 1. When any rustiness, motting, scratch, or other defect on the surfaces of steel materials, any such defect shan’t be deeper than 1/2 of the allowable variation. 2. The rustiness grade of the surface of steel material shall be lighter than c-grade stated in the current state standard of the Rustiness Grade and Sand-blasting Grade of Steel Materials Before Coating (GB 8923). 3. There shan’t be any stratification, slag inclusion and other similar defect on the edges and fracture of steel materials. Quantity for inspection: one hundred percent; Inspection methods: inspect by eye observation. 4.3 Welding materials (I) Main items under control 4.3.1 The types, specifications and performances of welding materials shall be in conformity with the current state standards of such products and the design requirements. Quantity for inspection: one hundred percent; Inspection methods: inspect the quality certificates and other such documentary evidences of quality, Chinese identification marks, test report and others. 4.3.2 For the welding materials used for the important steel structure, samples shall be taken for retest; and the retest result shall be in conformity with the current state standards of such products and the design requirements. Quantity for inspection: one hundred percent; Inspection methods: inspect the retest reports. (II) Ordinary items 4.3.3 The specifications, size and variation of welding stud or welding porcelain ring shall be in conformity with the requirements specified in the current state standard of cylinder-head stud for welding (GB 10433). Quantity for inspection: inspect randomly 1% of the total quantity, bot not less than 10 sets. Inspection method: measure with steel rulers or slide calipers. 4.3.4 In the surface of the welding rod, there shan’t be any desquamation of flux layer, or rustiness of welding core, or other defects; and the welding flux shan’t be wetted and agglomerated. Quantity for inspection: inspect randomly 1% of the total quantity, bot not less than 10 packs. Inspection method: Appearance examination. www.ChineseStandard.net Page 15 of 99 GB 50205-2001 4.4 Standard fasteners for connecting (I) Main items under control 4.4.1 The types, specifications and performances of standard fasteners and fittings for the connection of steel structures (including standard set of big high-strength hexagon bolt, set of torison-shear-type high-strength bolt, high-strength bolt for net-type steel structure, ordinary bolt, rivets, self-tapping screws, deep drawing forming rivets, spanker bolt, mechanical-type or chemical-reagent-type anchor bolt, sill anchor and other standard fasteners, as well as nut, gasket and other standard fittings ) shall be in conformity with the current state standards of such products and the design requirements. When sets of big high-strength hexagon bolt and sets of torison-shear-type high-strength bolt leave factory, they shall be delivered in packing box with the related test reports indicating their torque coefficients and fastening-caused axial force. Quantity for inspection: one hundred percent; Inspection methods: inspect the quality certificates and other such documentary evidences of quality, Chinese identification marks, test reports and others. 4.4.2 The torque coefficients of sets of big high-strength hexagon bolt shall be tested according to the related requirements set forth in the Appendix B; and the test result shall be in conformity with the related requirements specified in the Appendix B. Quantity for inspection: see the Appendix B of this Code; Inspection methods: inspect the retest reports. 4.4.3 The pre-tensile (fastening-caused axial force) of sets of torison-shear-type high-strength bolt shall be tested according to the related requirements set forth in the Appendix B; and the test result shall be in conformity with the related requirements specified in the Appendix B. Quantity for inspection: see the Appendix B of this Code; Inspection methods: inspect the retest reports. (II) Ordinary items 4.4.4 Sets of high-strength bolt shall be supplied in set and in packing box marked with batch number, specifications, quantity and production date. Bolts, nuts and gaskets shall be coated with a protective oil; and on their surfaces, there shan’t be any rustiness or dirt; and their screw threads shan’t be damaged. Quantity for inspection: inspect randomly 5% of the total quantity, bot not less than 3 boxes. Inspection method: examine by eye observation. 4.4.5 For the steel structure with safety shall be up to the first grade, and the net-type steel structure with bolt ball joints and which span is more than 40m, the surface hardness of the high strength bolts shall be tested. For the high strength bolt of 8.8-grade, the surface hardness shall be HRC21~29. For the high strength bolt of 10.9-grade, the surface hardness shall be HRC32~36; and such high strength bolt shan’t have any crack or damage. Quantity for inspection: inspect randomly 8 for every kind of specifications. Inspection method: measure surface harness with hardness meter; and perform flaw www.ChineseStandard.net Page 16 of 99 GB 50205-2001 detection with 10-times hand lens or magnetic particles. 4.5 Weld balls (I) Main items under control 4.5.1 The types/categories, specifications and performances of weld balls and raw materials of weld ball shall be in conformity with the current state standards of such products and the design requirements. Quantity for inspection: one hundred percent; Inspection methods: inspect the quality certificates and other such documentary evidences of quality, Chinese identification marks, test report and others. 4.5.2 Welding seams of weld balls shall be detected by non-destructive detection method; and the detection result shall be in conformity with the design requirements. If there isn’t any special requirements in the design, the quality of such welding seam shall be in conformity with the standard of the second-class quality, specified in this Code. Quantity for inspection: inspect randomly 5% of the total quantity for every kind of specifications, but not less than 3. Inspection methods: ultrasonic flaw detection; and check the test/detection or examination report. (II) Ordinary items 4.5.3 The diameters, roundness, decrease of wall thickness, other sizes and allowable variations shall be in conformity with the related requirements specified in this Code. Quantity for inspection: inspect randomly 5% of the total quantity for every kind of specifications, but not less than 3. Inspection method: measure caliper rules and thickness meters. 4.5.4 In the surface of weld ball, there shan’t be any cockle; and any local sag or crest shan’t be more than 1.5mm in depth or height. Quantity for inspection: inspect randomly 5% of the total quantity for every kind of specifications, but not less than 3. Inspection method: inspect with arc-shape cover dies, caliper rules and eyes. 4.6 Bolt balls (I) Main items under control 4.6.1 The types/categories, specifications and performances of bolt balls and raw materials of bolt ball shall be in conformity with the current state standards of such products and the design requirements. Quantity for inspection: one hundred percent; Inspection methods: inspect the quality certificates and other such documentary evidences of quality, Chinese identification marks, test report and others. 4.6.2 In bolt ball, there shan’t be any burnt or crack or cockle. Quantity for inspection: inspect randomly 5% of the total quantity for every kind of specifications, but not less than 5. www.ChineseStandard.net Page 17 of 99 GB 50205-2001 4.10 Others (I) Main items under control 4.10.1 The types/categories, specifications and performances of rubber mats used for steel structures shall be in conformity with the current state standards of such products and the design requirements. Quantity for inspection: one hundred percent; Inspection methods: inspect the quality certificates and other such documentary evidences of quality, Chinese identification marks, test report and others. 4.10.2 The types/categories, specifications and of other special materials applied in the construction steel structures shall be in conformity with the current state standards of such products and the design requirements. Quantity for inspection: one hundred percent; Inspection methods: inspect the quality certificates and other such documentary evidences of quality, Chinese identification marks, test report and others. www.ChineseStandard.net Page 20 of 99 GB 50205-2001 determined by ultrasonic flaw detection. The inner flaws of such welding seams shall be graded and detected according to the current state standard of Manual Ultrasonic Flaw Detection of Welding Seams, and Grading Methods for Flaw Detection Results (GB 11345), or according to the current state standard of Radiograph and Quality Grading of Butt Joints of Steel Melting Welding (GB 3323). For the welding seams of net-type steel structures with weld ball joints, welding seams of net-type steel structures with bolt ball joints, and welding seams on the relation lines of T/K/Y-shape joints of circular duct, the inner flaws shall be graded and detected according to the related current state standards respectively, including the Ultrasonic Flaw Detection and Quality Grading Methods for Welding seams of Net-type Steel Structures with Weld Ball Joints (JBJ/T 3.34.1), the Ultrasonic Flaw Detection and Quality Grading Methods for Welding seams of Net-type Steel Structures with Bolt Ball Joints (JBJ/T 3034.2), and the Welding Procedures for Construction Steel Structures (JGJ 81). The quality grades of the first-grade or second-grade welding seams, and the grading of flaws shall be in conformity with the Table 5.2.4. Quantity for inspection: one hundred percent; Inspection methods: check the records of ultrasonic detection or the records of ray flaw detection. Table 5.2.4 Quality grades of the first-grade or second-grade welding seams, and the grading of flaws Quality grade of welding seam First grade Second grade Grade determined by II-grade III-grade assessment Ultrasonic detection of inner flaws Grade determined by test B-grade B-grade Detection portion 100% 10% Grade determined by II-grade III-grade assessment Ray detection of inner Grade determined by test AB-grade AB-grade flaws Detection portion 100% 20% Note: The detection portion shall be calculated according to the following principles: (1) For the welding seams performed in factory, the detection portion shall be calculated for every welding seam; and the detection length shall be more than 200mm; and when the welding seam is less than 200mm, the whole seam shall be detected; (2) For the welding seams performed onsite during installation, the detection portion shall be calculated for every type of welding seams performed under same conditions; and the detection length shall be more than 200mm; and the seam accepted detection shall be more than one. 5.2.5 For T-shape joints, “+”-shape joints, corner joints, and other composite butt-jointed or corner butt jointed seams needing fusion penetration, the sizes of legs shall be more than t/4 (see Figure 5.2.5 (a), (b), (c)). For any welding seam between the upper flange and a crane beam or similar element with design requirements of fatigue verification and calculation, the sizes of legs shall be more than t/2 (see Figure 5.2.5 (d)), but less than 10mm; and the allowable variation for the size of leg is 0~4mm. Quantity for inspection: inspect randomly 10% of the total for every type of seams, but not less than 3; Inspection method: inspect by eye observation, and measure randomly with welding seam gauge. www.ChineseStandard.net Page 22 of 99 GB 50205-2001 Figure 5.2.5 Sizes of legs of welding seams 5.2.6 In the surface of welding seam, there shan’t be any crack, or welding beading, or other defect. In the welding seam of the first-grade or second-grade, there shan’t be any air cavity, included slag, crater crack, arc-caused fray and other similar defect. Moreover, for the welding seam of the first-grade, there shan’t be any overmask, insufficient welding, contraction of root, and other similar defect. Quantity for inspection: inspect randomly 10% of the total for every batch of elements of every type, but not less than 3; and inspect 5% of the total for every type of welding seams in the elements inspected, but not less than one; and inspect one point for every seam inspected, ensuring that the total of the points examined/detected during inspection are more than 10 points. Inspection method: examine by eyes or hand lens or welding-seam gauges or steel rulers. Note: when any flaw can’t be determined, detect via permeation flaw detection or magnetic particle inspection. II Ordinary items 5.2.7 For the welding seams needing heat treatment before welding or after welding, the preheating temperatures and postheating temperatures shall be in conformity with the requirements specified in the related current state standards or determined through process trials; and the preheating areas shall be located on the two sides of the joint, and shall be wider than 1.5 times of the thickness of piece to be welded (but not less than 100mm); and the postheating shall be carried out upon the completion of welding seam, and the duration of heat preservation shall be determined on the basis of 1hr/25mm (thickness of plate). Quantity for inspection: one hundred percent; Inspection methods: check the records of preheating or postheating process records, and process trial reports. 5.2.8 The appearance quality of the second-grade or third-grade seams shall be in conformity with the requirements listed in the Table A.0.1 of Appendix A. The appearances of third-grade butt-jointed seams shall be inspected in accordance with the requirements stated for the second-grade seams. Quantity for inspection: inspect randomly 10% of the total for every batch of elements of every type, but not less than 3; and inspect 5% of the total for every type of welding seams in the elements inspected, but not less than one; and inspect one point for every seam inspected, ensuring that the total of the points examined/detected during inspection are more than 10 points. Inspection method: examine by eyes or hand lens or welding-seam gauges or steel rulers. 5.2.9 The allowable variations for sizes of welding seam shall be in conformity with the requirements listed in the Table A.0.2 of Appendix A. www.ChineseStandard.net Page 23 of 99 GB 50205-2001 Quantity for inspection: inspect randomly 10% of the total for every batch of elements of every type, but not less than 3; and inspect 5% of the total for every type of welding seams in the elements inspected, but not less than one; and inspect one point for every seam inspected, ensuring that the total of the points examined/detected during inspection are more than 10 points. Inspection method: examine with welding-seam gauges. 5.2.10 For concave fillet welds formed by welding, the transition between the metal of joint and the parent metal shall be smooth; and for concave fillet welds formed by processing, the existence of any cutting trace isn’t allowed. Quantity for inspection: inspect randomly 10% of the total for every batch of elements of every type, but not less than 3; Inspection method: examine by eye observation. 5.2.11 The appearance of any welding seam shall be able to meet the following requirements: a. Even; b. Good formation; c. Smooth transition between joints, and between joint and metal base; d. No welding slag/spatter, basically. Quantity for inspection: inspect randomly 10% of the total for every batch of elements of every type, but not less than 3; and inspect 5% of the total for every type of welding seams in the elements inspected, ensuring that the total of the points examined/detected during inspection are more than 10 points. Inspection method: examine by eye observation. 5.3 Welding work of welding stud (I) Main items under control 5.3.1 The construction organizations shall evaluate the welding process adopted for stud welding; and the related result shall be in conformity with the design requirements and the requirements specified in the related current state standard(s). The porcelain rings shall be baked in accordance with the related instructions. Quantity for inspection: one hundred percent; Inspection methods: check the evaluation reports of stud welding process, and baking records. 5.3.2 The bending test shall be carried out after the stud welding; and in the seams of stud welding and the areas influenced by heating, there shan’t be any crack observable for eyes. Quantity for inspection: inspect randomly 10% of the total for every batch of elements of every type, but not less than 10; and inspect 1% of the total for every elements inspected, but not less than 1. Inspection method: bend the inspected stud to 300 and examine it with an angle squares and eyes. (II) Ordinary items 5.3.3 The legs on the root of stud shall be even; and the leg with insufficiently-fritted facade or the leg less than 3600 shall be repaired. www.ChineseStandard.net Page 24 of 99 GB 50205-2001 Quantity for inspection: inspect randomly 1% of the total of stud, but not less than 10; Inspection method: examine by eye observation. www.ChineseStandard.net Page 25 of 99 GB 50205-2001 Inspection method: examine by eye observation or by hammering with a small hammer. 6.3 Connecting of high strength bolts (I) Main items under control 6.3.1 For the fabrication or installation units of steel structure, the slip coefficients of faying surfaces of high strength bolts shall be tested and retested according to the Appendix B of this Code, respectively. For the faying surfaces of the elements processed onsitely, the slip coefficients of faying surfaces shall be tested separately; and the related test results shall be in conformity with the design requirements. Quantity for inspection: see the Appendix B of this Code; Inspection method: Check the test reports and retest reports of slip coefficients of faying surfaces. 6.3.2 The completing torque of set of big high-strength hexagon bolt shall be tested 1~48hrs later than the completing screw; and the related test result shall be in conformity with the related requirements specified in the Appendix B of this Code. Quantity for inspection: inspect randomly 10% of the total of joints, but not less than 10; and inspect 10% of the total of bolts for every joint inspected, but not less than 2. Inspection method: see the Appendix B of this Code. 6.3.3 In one joint, the torsion-shear-type high-strength bolts remaining wabblers, except the bolts that can’t be approached by special-purpose wrenches due to the structure, shan’t be more than 5% of the total in this joint after the completing screw of set of such bolts. For all sets of such torsion-shear-type high-strength bolts remaining wabblers, the completing screw shall be performed by calibrated wrench method or angle method, and shall be marked; and the completing screw tests shall be performed according to the clause 6.3.2 of this Code. Quantity for inspection: inspect randomly 10% of the total of joints, but not less than 10; and perform tests of completing screw torque for 100% of sets of torsion-shear-type high-strength bolts remaining wabblers after completing screw. Inspection method: examine by eye observation and by the method specified in the Appendix B of this Code. (II) Ordinary items 6.3.4 For sets of high strength bolts, the screw order, the opening screw torques, and the completing screw torques shall be in conformity with the design requirements and the requirements specified in the current state standard of the Design, Construction and Acceptance Procedures for High-Strength Bolt Connection of Steel Structures (JGJ 82). Quantity for inspection: one hundred percent. Inspection method: check the standardization records of torque wrench, and the records of bolt construction. 6.3.4 For sets of high strength bolts, there shall be 2~3 units of thread outcroping after the completing screw of every set; and the proportion of such bolts with 1 or 4 units of www.ChineseStandard.net Page 27 of 99 GB 50205-2001 thread outcroping after the completing screw are allowed to be 0~ 10% of the total. Quantity for inspection: inspect randomly 5% of the total of joints, but not less than 10. Inspection method: examine by eye observation. 6.3.6 The faying surfaces of high strength bolts shall be kept clean and dry without any fash, fin, welding spatter, welding scar, ferric oxide skin or dirt; moreover, the faying surfaces shan’t be painted other than required by the design. Quantity for inspection: one hundred percent. Inspection method: examine by eye observation. 6.3.7 The high strength bolt shall be inserted into the bolt hole freely. The bolt hole for high strength bolt shan’t be expanded by gas cutting; and the number of bolt holes to be expanded shall be approved by the related design personnel; and diameter of any expanded hole shan’t exceed 1.2 d (d: diameter of bolt). Quantity for inspection: 100% of the expanded bolts. Inspection method: examine with eyes and calipers. 6.3.8 After the general assembling of net-type steel structure with bolt ball joints, the connection between any high strength bolt and any ball joint shall be firm; and the high strength bolt shall enter the corresponding bolt ball by more than 1.0d (d: diameter of bolt); and in any location of such connection, there shan’t be any clearance, loose and other condition of insufficient screwing. Quantity for inspection: inspect randomly 5% of the total of joints, but not less than 10. Inspection method: examine by ordinary wrenches and measure with rulers. www.ChineseStandard.net Page 28 of 99 GB 50205-2001 7 Processing Work of Steel Parts and Components 7.1 Ordinary requirements 7.1.1 This chapter is applicable to the acceptance of processing quality of steel parts and components, performed during the fabrication or installation of steel structures. 7.1.2 The processing work of steel parts and components may be divided to one or several inspection/test batches according to the same division principles adopted for the corresponding fabrication of steel structures or the corresponding inspection/tests batches of installation work. 7.2 Gas cutting (I) Main items under control 7.2.1 In the cut surface or shear surface of steel material, there shan’t be any crack, included slag, stratification, or absence of arris more than 1mm. Quantity for inspection: one hundred percent; Inspection method: examine with eyes or hand lens or dial gauge; and detect via permeation flaw detection or magnetic particle inspection or ultrasonic flaw detection. (II) Ordinary items 7.2.2 The allowable variations of gas cutting shall be in conformity with the requirements listed in the Table 7.2.2. Quantity for inspection: inspect randomly 10% of the total of cut surfaces, but not less than 3. Inspection method: examine with eyes or steel rulers or clearance gauges. Table 7.2.2 Allowable variations of gas cutting(mm) Items Allowable variations Width and length of parts ±3.0 Planeness of cut surface 0.05t, but less than 2.0 Depth of cut 0.3 Depth of local nick 1.0 Note: t is the thickness of cut surface 7.3.3 The allowable variations of mechanical shearing and cutting shall be in conformity with the requirements listed in the Table 7.2.3. Quantity for inspection: inspect randomly 10% of the total of cut/shear surfaces, but not less than 3. Inspection method: examine with eyes or steel rulers or clearance gauges. 7.2.3 The allowable variations of mechanical shearing and cutting (mm) Items www.ChineseStandard.net Allowable variations Page 29 of 99 GB 50205-2001 Angle steel Channel steel l2 800b y-y 100b xx 90b xx 50h y-y 90b xx 50h l2 400 h 25h y-y 50b l2 400b 25b l2 720b l2 400h l2 720b I steel l2 400b 50b l2 360b l2 200h l2 360b l2 200 h 45b 25h 45b l2 200b Note: r is curvature radius; f is bowed height; l is chord of arc; t is thickness of steel plate. 7.3.5 The allowable variations for steel materials straightened shall be in conformity with requirements listed in the Table 7.3.5. Quantity for inspection: inspect randomly 10% of the total of pieces straightened, but not less than 3. Inspection method: inspect by eye observation or by measurement. Table 7.3.5 Allowable variations for steel materials straightened (mm) Item Local planness of steel plate t≤14 t>14 Bowed height of section steel Verticality of angle steel Allowable variation 1.5 1.0 l /1000, but less than 5.0 b /100, and the angle of 900 angle steel Channel steel’s verticality between the flange and stalk plate b/80 I steel’s or (H-shape steel’s) verticality between the flange and stalk plate b/100, but less than 2.0 7.4 Graphic example Processing of edges (I) Main items under control 7.4.1 If any edges of parts processed by gas cutting or shearing needs to be processed, the planing thickness shan’t be less than 2.0mm. Quantity for inspection: one hundred percent; Inspection method: Check reports of process and records of construction. (II) Ordinary items www.ChineseStandard.net Page 31 of 99 GB 50205-2001 7.4.2 The allowable variations of edge processing shall be in conformity with the requirements listed in the Table 7.4.2. Quantity for inspection: inspect randomly 10% of the total of pieces processed, but not less than 3. Inspection method: inspect by eye observation or by measurement. Table 7.4.2 Allowable variations of edge processing (mm) Items Allowable variations Width and length of parts ±1.0 Linearity of edge processed t/3000, but less than 2.0 Corner included by the two neighboring ±6’ sides Verticality of surface processed 0.025t, but less than 0.5 50 Roughness of surface processed 7.5 Processing of pipes/ducts and balls (I) Main items under control 7.5.1 In formed bolt balls, there shan’t any crack, cockle or burnt. Quantity for inspection: inspect randomly 10% of the total for every kind of specifications, but not less than 5. Inspection method: examine with 10-times hand lens or carry out superficial flaw inspection. 7.5.2 In surface of steel plate processed to be semisphere, there shan’t any crack or cockle. The butt-welding bevel of weld ball shall be processed mechanically; and the butt-jointed seam shall be ground and flattened. Quantity for inspection: inspect randomly 10% of the total for every kind of specifications, but not less than 5. Inspection method: examine with 10-times hand lens or carry out superficial flaw inspection. (II) Ordinary items 7.5.3 The allowable variations of processing of bolt balls shall be in conformity with the requirements listed in the Table 7.5.3. Quantity for inspection: inspect randomly 10% of the total for every kind of specifications, but not less than 5. Inspection method: see the Table 7.5.3. Table 7.5.3 Allowable variations of processing of bolt balls (mm) Item Roundness Parallelism degree between two milled surfaces d≤120 d>120 d≤120 d>120 Distance between milled surface and center of ball www.ChineseStandard.net Allowable variations 1.5 2.5 0.2 0.3 ±0.2 Inspection method Measure with calipers and sliding calipers Measure with V-shape blocks of dial gauge Measure with sliding calipers Page 32 of 99 GB 50205-2001 Corner included by centerlines of two bolt holes ±30’ Verticality between the two milled surfaces and the axis line of bolt hole 0.005r d≤120 Diameter of semifinished ball d>120 +2.0 -1.0 +3.0 -1.5 Check with index heads Measure with dial gauges Measure with calipers and sliding calipers 7.5.4 The allowable variations of preparation of weld balls shall be in conformity with the requirements listed in the Table 7.5.4. Quantity for inspection: inspect randomly 10% of the total for every kind of specifications, but not less than 5. Inspection method: see the Table 7.5.4. Table 7.5.4 Allowable variations of preparation of weld balls (mm) Item Allowable variations Inspection method ±0.005d Measure with calipers Diameter ±2.5 and sliding caliper Measure with calipers 2.5 Roundness and sliding caliper Measure with calipers Decrease of wall thickness 0.13r, but less than 1.5 and sliding caliper Measure with cover Matched edges of two semispheres 1.0 dies or sliding caliper 7.5.5 The allowable variations of processing of steel tubemembers (steel bar) used in net-type steel structures (trusses) shall be in conformity with the requirements listed in the Table 7.5.5. Quantity for inspection: inspect randomly 10% of the total for every kind of specifications, but not less than 5. Inspection method: see the Table 7.5.5. Table 7.5.5 Allowable variations of processing of steel tubemembers used in net-type steel structures (trusses) (mm) Item Allowable variations Inspection method Measure with steel rulers Length ±1.0 or dial gauges Measure with V-shape Verticality between end surface and the axis of tube 0.005r blocks of dial gauge Measure with cover dies Curve of tube mouth 1.0 or sliding caliper 7.6 Processing of Hole (I) Main items under control 7.6.1 For bolt hole of A-grade or B-grade, the accuracy of shall be H12-grade; the roughness of surfaces of wall shall be less than 12.5um; and the allowable variations of diameters shall be in conformity with the requirements listed in the Table 7.6.1-1. Quantity for inspection: inspect randomly 10% of the total of steel structures, but www.ChineseStandard.net Page 33 of 99 GB 50205-2001 not less than 3. Inspection method: measure with sliding calipers or hole-diameter gauges. Table 7.6.1-1 Allowable variations for diameters of A-grade or B-grade bolt-holes (mm) No. Nominal diameter of bolt, diameter of bolt hole Nominal diameter of bolt, allowable variations 1 10-18 0.00-0.21 2 18-30 0.00-0.21 3 30-50 0.00-0.25 Diameter of bolt hole, allowable variations +0.18 0.00 +0.21 0.00 +0.25 0.00 Table 7.6.1-2 Allowable variations for diameters of C -grade bolt-holes (mm) Item Diameter Roundness Verticality Allowable variations +1.0 0.0 2.0 0.03t,but less than 2.0 (II) Ordinary items 7.6.2 The allowable variations for spacing intervals between bolt holes shall be in conformity with the requirements listed in the Table 7.6.1-2. Quantity for inspection: inspect randomly 10% of the total of steel structures, but not less than 3. Inspection method: measure with steel rulers. Table 7.6.2 Allowable variations of spacing intervals between bolt holes (mm) Range of spacing intervals between bolt holes 501-1200 1201-3000 >3000 ≤500 Distance between any two bolt holes ±1.0 ±1.5 Distance between the end holes of two neighboring groups ±1.5 ±2.0 ±2.5 ±3.0 of holes Note: 1. All bolt holes for connecting butt plate(s ) and one bar at the joint constitutes on group; 2. All bolt holes on one side of one butt plate of one butt joint constitutes on group; 3. All bolt holes between two neighboring butt joints, except the bolt holes described above, constitutes on group; 4. All bolt holes in 1m-range of flange of bended element constitutes on group. 7.6.3 If the variation of spacing intervals between any two bolt hole exceeds the related allowable variation listed in the Table 7.6.2, the bolt hole shall be overlaid by welding with welding rods matching the parent metal; and new bolt holes shall be processed again. Quantity for inspection: one hundred percent; Inspection method: examine by eye observation. www.ChineseStandard.net Page 34 of 99 GB 50205-2001 not less than 10. Inspection method: examine with a clearance ruler of 0.3mm, inserting 25% of the ruler (note: the clearance at edge shan’t be more than 0.8mm). 8.3.4 For bars of truss, the allowable variations for side misalignment of intersection points of axis lines shall be less than 3.0mm, and the allowable variations of axis lines shan’t be more than 4.0mm. Quantity for inspection: inspect randomly 10% of the total of elements, but not less than 3. Inspection method: examine rulers. 8.4 Milling of ends and installation of welding bevel (I) Main items under control 8.4.1 The allowable variations of milling of ends shall be in conformity with the requirements listed in the Table 8.4.1. Quantity for inspection: inspect randomly 10% of the total of milled surfaces, but not less than 3. Inspection method: measure with steel rulers, angle squares, and clearance gauges. Table 8.4.1 Allowable variations of milling of ends (mm) Item Length of element with milled ends Length of parts with milled ends Planness of milled surface Verticality between axis line and milled surface Allowable variations ±2.0 ±0.5 0.3 l / 1500 (II) Ordinary items 8.4.2 The allowable variations of installation of welding bevels shall be in conformity with the requirements listed in the Table 8.4.2. Quantity for inspection: inspect randomly 10% of the total of bevels, but not less than 3. Inspection method: measure with welding seam gauges. Table 8.4.2 Allowable variations of installation of welding bevels (mm) Item Angle of bevel Milled edge 8.4.3 Allowable variations 0 ±5 ±1.0mm The milled surfaces exposed shall be protected by rust prevention. Quantity for inspection: one hundred percent; Inspection method: examine by eye observation. 8.5 www.ChineseStandard.net Overall dimensions of steel elements Page 36 of 99 GB 50205-2001 (I) Main items under control 8.5.1 For steel elements, the allowable variations of overall dimensions mainly controlled shall be in conformity with the requirements listed in the Table 8.5.1. Quantity for inspection: one hundred percent; Inspection method: measure with steel rulers. Table 8.5.1 Allowable variations of steel elements’ overall dimensions mainly controlled (mm) Item Distance between the bearing surface of single column/pillar (or beam, or truss) and the first mounting hole Distance between the milled surface of multi-layer and the first mounting hole Distance between the lateral mounting holes closest to the two ends of plain girder respectively Geometric dimensions of the section of the joint of element Deviation of centerline of stalk plate at joint of column or beam Bowed height of bended element (bar) Allowable variations ±1.0 ±1.0 ±3.0 ±3.0 2.0 t/1000, but less than 10 (II) Ordinary items 8.5.2 The allowable variations of ordinary items of overall dimensions shall be in conformity with the requirements specified in the C.0.3~C.0.9 in the Appendix C of this Code. Quantity for inspection: inspect randomly 10% of the total of bevels, but not less than 3. Inspection method: see the C.0.3~C.0.9 in the Appendix C of this Code. www.ChineseStandard.net Page 37 of 99 GB 50205-2001 10 Installation Work of Single-layer Steel Structures 10.1 Ordinary requirements 10.1.1 This chapter is applicable to the acceptance of installation quality of the single-layer steel-structures’ main structures, underground steel structures and other subordinate structures including purlines, wall supporters, steel platforms, steel ladder and guard rails. 10.1.2 The installation work of the single-layer steel structures may be divided into one or several inspection/test batches according to deformed seams or space rigid units. The underground structure may be divided into several inspection/test batches according to the corresponding underground floors. 10.1.3 The acceptance of inspection/test batches of steel structure may be carried out after the materials or products have been admitted to enter site, and the welding work, connecting work of fasteners and fabrication have been inspected and accepted. 10.1.4 For the measurement and correction of installation, installation of high strength bolts, construction performed under negative temperatures, and welding process, the process trial or process evaluation shall be carried out and then prepare the related construction process or scheme before the installation. 10.1.5 The measurement of installation variation shall be carried out after the forming and fixing of space rigid unit. 10.1.6 During the installation, the construction loads of roof board, floors and platforms shall be controlled; It is prohibited for the construction loads and snow loads to exceed the bearing capabilities of beams, trusses, plates of roof board, plates of floor, and plates of platform. 10.1.7 Upon the formation of space rigid unit, the clearances between the bottom plates of columns and the base’ top surface shall be filled with concrete or mortar for the second time in a timely manner. 10.1.8 For cranes’ beams or beams bearing load directly, no hanger or fixture is allowed to be welded to the flanges bearing tensile; and for cranes’ trusses or trusses bearing load directly, no hanger or fixture is allowed to be welded to the chords bearing tensile. 10.2 Bases and bearing surfaces (I) Main items under control 10.2.1 The location axises of buildings, axises and elevation of basees, and specifications and fastening of anchor bolts shall be in conformity with the design requirements. Quantity for inspection: inspect randomly 10% of the total of column bases, but not less than 3; Inspection methods: measure with a theodolite, a level gauge, a pheodolite and steel rulers onsitely. 10.2.2 For base’s top surface bearing load directly, or pre-buried steel plate of base’ top www.ChineseStandard.net Page 39 of 99 GB 50205-2001 surface taken as the bearing surface of column, or supporter taken as the bearing surface of column, the allowable variations of locations of bearing surface and anchor bolts shall be in conformity with the requirements listed in the Table 10.2.2. Quantity for inspection: inspect randomly 10% of the total of column bases, but not less than 3; Inspection methods: measure with a theodolite, a level gauge, a pheodolite and steel rulers onsitely. Table 10.2.2 Allowable variations of locations of bearing surfaces and anchor bolts (mm) Item Allowable variations ±3.0 Elevation l / 1000 Levelness Anchor bolt Deviation of center of bolt 5.0 Deviation of center of preserved hole 10.0 10.2.3 When molded mortar base-plates are used, the allowable variations of molded mortar base-plate shall be in conformity with the requirements listed in the Table 10.2.3. Quantity for inspection: inspect randomly 10% of the total of column bases, but not less than 3; Inspection methods: measure with a theodolite, a level gauge, a pheodolite and steel rulers onsitely. Bearing surface Table 10.2.3 Allowable variations of molded mortar base-plates (mm) Item Allowable variations 0.0 Elevation of top surface -3.0 l / 1000 Levelness Location 20.0 10.2.4 hen cup-mouth bases are used, the allowable variations of sizes of cup mouths shall be in conformity with the requirements listed in the Table 10.2.4. Quantity for inspection: inspect randomly 10% of the total of column bases, but not less than 4; Inspection methods: observe with eyes and measure with rulers. Table 10.2.4 Allowable variations of sizes of cup mouths (mm) Item Allowable variations 0.0 Elevation of bottom surface -5.0 ±5.0 Depth of cup mouth Verticality of cup mouth H/100, but less than 10.0 Location 10.0 (II) Ordinary items 10.2.5 e allowable variations of sizes of anchor bolts shall be in conformity with the requirements listed in the Table 10.2.5. www.ChineseStandard.net Page 40 of 99 GB 50205-2001 listed in the Table 10.3.4. Quantity for inspection: 100% of the main facades; and for every fascade, one row of middle columns shall be selected besides the two rows of square columns. Inspection methods: measure a theodolite and a pheodolite onsitely. Table 10.3.4 Allowable variations of overall verticalities and overall curvatures of plan (mm) Item Allowable variations Overall verticality of main structure H/1000, but less than 25.0 Overall curvatures of plan of main structure L/1500, but less than 25.0 Graphic example (II) Ordinary items 10.3.5 For steel column and other main elements, all centerlines, benchmarks of elevation shall be marked. Quantity for inspection: inspect randomly 10% of the total of elements of every type, but not less than 3; Inspection methods: examine by eye observation. 10.3.6 For trusses (or beams) mounted on a concrete columns, the allowable variation between the center of base and the location axises, shall be less than 10mm; and when the large-size concrete plate is used for roof board, the allowable variations of spacing intervals of steel trusses (or beams) shall be less than 10mm. Quantity for inspection: inspect randomly 10% of the total of elements of every type, but not less than 3; Inspection methods: measure with threads and steel rulers onsitely. 10.3.7 The allowable variations of installation of steel columns shall be in conformity with the requirements listed in the Table E.0.1 in the Appendix E of this Code. Quantity for inspection: inspect randomly 10% of the total of columns, but not less than 3; Inspection methods: see the Table E.0.1 in the Appendix E of this Code. 10.3.8 For beams of steel cranes, or similar elements bearing dynamic loads, the allowable variations of installation shall be in conformity with the requirements listed in the Table E.0.2 in the Appendix E of this Code. Quantity for inspection: inspect randomly 10% of the total of beams of steel cranes, but not less than 3; Inspection methods: see the Table E.0.2 in the Appendix E of this Code. 10.3.9 For purlines, wall supporter and other subordinate elements, the allowable variations of installation shall be in conformity with the requirements listed in the Table E.0.3 in the Appendix E of this Code. Quantity for inspection: inspect randomly 10% of the total of elements of every type, but not less than 3; Inspection methods: see the Table E.0.3 in the Appendix E of this Code. 10.3.10 The installation of steel platforms, steel ladders and guard rails shall be in conformity with the current state standards including the Stationary-type Steel Straight Ladders (GB 4.53.1), Stationary-type Steel Agley Ladders (GB 4.53.2), Stationary-type www.ChineseStandard.net Page 42 of 99 GB 50205-2001 Guard Rails (GB 4.53.3), Stationary-type Steel Platform (GB 4.53.4). For steel platforms, steel ladders and guard rails, the allowable variations of installation shall be in conformity with the related requirements listed in the Table of 10.3.11. Quantity for inspection: inspect randomly 10% of the total of joints of every type, but not less than 3; Inspection methods: measure with rulers. Table 10.3.11 Allowable variations of clearances of onsite fit-up welding (mm) Item 10.3.12 dirt. Allowable variations +3.0 Clearance without adapter plate 0.0 +3.0 Clearance with adapter plate -2.0 The surfaces of steel structures shall be clean without any scar, silt or any other Quantity for inspection: inspect randomly 10% of the total of elements of every type, but not less than 3; Inspection methods: examine by eye observation. www.ChineseStandard.net Page 43 of 99 GB 50205-2001 11 Installation Work of Multilayer or High Steel Structures 11.1 Ordinary requirements 11.1.1 This chapter is applicable to the acceptance of installation quality of the multilayer or high steel-structures’ main structures, underground steel structures and other subordinate structures including purlines, wall supporters, steel platforms, steel ladder and guard rails. 11.1.2 The installation work of multilayer or high steel structures may be divided into one or several inspection/test batches according to the corresponding floors or construction sections. The underground structure may be divided into several inspection/test batches according to the corresponding underground floors. 11.1.3 The length sizes of columns, beams and supporter shall include the contraction allowance and other allowance for deformation. 11.1.4 During the installation of columns, the location axis of every sub-column shall be extended directly from the control axis on the ground, and it is prohibited to extend such axis from the axis of the lower sub-column. 11.1.5 The elevation of structure may be controlled according to the relative elevation or design elevation. 11.1.6 The acceptance of inspection/test batches of steel structure may be carried out after the materials or products have been admitted to enter site, and the welding work, connecting work of fasteners and fabrication have been inspected and accepted. 11.1.7 The installation of mulitilayer or high steel structure shall be in conformity with the 10.1.4, 10.1.5, 10.1.6, 10.1.7, 10.1.8 of this Code. 11.2 Bases and bearing surfaces (I) Main items under control 11.2.1 The location axises of buildings, location axises and elevation of columns on base, and specifications, locations and fastening of anchor bolts shall be in conformity with the design requirements; and when there isn’t any special requirement in the design, the location axises of buildings, location axises and elevation of columns on base, and specifications, locations and fastening of anchor bolts shall be in conformity with the requirements listed in the Table 11.2.1. Quantity for inspection: inspect randomly 10% of the total of column bases, but not less than 3; Inspection methods: measure with a theodolite, a level gauge, a pheodolite and steel rulers onsitely. Table 11.2.1 Allowable variations of location axises of buildings, location axises and elevation of columns on base, and anchor bolts (mm) Item Allowable variations Location axises of building L/20000, but less than 3.0 Location axises of column on base 1.0 www.ChineseStandard.net Graphic example Page 44 of 99 GB 50205-2001 Elevation of bottom of column on base ±2.0 Displacement of anchor bolt 2.0 11.2.2 For multilayer building taking directly base’s top surface as bearing surface of columns, or taking pre-buried steel plates of base’ top surface as bearing surfaces of columns, or taking support seat as bearing surface of columns, the allowable variations of locations of bearing surfaces and anchor bolts shall be in conformity with the requirements listed in the Table 10.2.2. Quantity for inspection: inspect randomly 10% of the total of column bases, but not less than 3; Inspection methods: measure with a theodolite, a level gauges, a pheodolite and steel rulers onsitely. 11.2.3 When molded mortar base-plates are used for multilayer building, the allowable variations of molded mortar base-plate shall be in conformity with the requirements listed in the Table 10.2.3. Quantity for inspection: inspect randomly 10% of the total of column bases, but not less than 3; Inspection methods: measure with a theodolite, a pheodolite, a level gauge and steel rulers onsitely. 11.2.4 When cup-mouth bases are used, the allowable variations of sizes of cup mouths shall be in conformity with the requirements listed in the Table 10.2.4. Quantity for inspection: inspect randomly 10% of the total of bases, but not less than 4; Inspection methods: observe with eyes and measure with rulers. (II) Ordinary items 11.2.5 The allowable variations of sizes of anchor bolts shall be in conformity with the requirements listed in the Table 10.2.5. Moreover, the threads of anchor bolts shall be protected. Quantity for inspection: inspect randomly 10% of the total of column bases, but not less than 3; Inspection methods: measure with steel rulers onsitely. 11.3 Installation and rectification (I) Main items under control 11.3.1 The steel elements shall be in conformity with the design requirements and the related requirements specified in this Code. The deformation and coating desquamation caused during conveyance, pile-up and hoisting shall be rectified or repaired. Quantity for inspection: inspect randomly 10% of the total of elements, but not less than 3; Inspection methods: measure with threads and steel rulers onsitely, or examine by eye observation www.ChineseStandard.net Page 45 of 99 GB 50205-2001 11.3.2 The allowable variations of installation of columns shall be in conformity with the requirements listed in the Table 11.3.2. Quantity for inspection: inspect 100% of standard columns; and inspect randomly 10% of non-standard columns, but not less than 3; Inspection methods: inspect with a pheodolite, a laser theodolite and steel rulers onsitely. Table 11.3.2 Allowable variations of installation of columns (mm) Item Deviations of axises of bottom-layer column’s bottom from the location axises Allowable variations Location axises of column 1.0 Verticality of single sub-column h/1000, but less than 10.0 Graphic example 3.0 11.3.3 For joints required to be pressed closely according to the design, the close-contact area shall be more than 70% of the total area of the contact surface; and the clearance at edges shall be less than 0.8mm. Quantity for inspection: inspect randomly 10% of the total of joints, but not less than 3; Inspection methods: measure with steel rulers and clearance rulers of 0.3mm or 0.8mm (thickness) onsitely. 11.3.4 For the verticalities and lateral bowed-heights of steel main-beams, steel secondary-beams and other bars bearing pressing-forces, the allowable variations shall be in conformity with the related requirements for steel roof-trusses, listed in the Table 10.3.3. Quantity for inspection: inspect randomly 10% of the total of elements of every type, but not less than 3; Inspection methods: measure with threads, theodolites and steel rulers onsitely. 11.3.5 For main bodies of multilayer or high steel structures, the allowable variations of overall verticalities and the overall curvatures of plan shall be in conformity with the requirements listed in the Table 11.3.5. Quantity for inspection: 100% of the main facades; and for every fascade, one row of middle columns shall be selected besides the two rows of square columns. Inspection methods: measure overall verticalities with a laser theodolite and a pheodolite, or calculate any overall verticality by accumulating all the allowable variations of all sections of columns; and calculate any overall curvature of plan by accumulating all the related allowable variations measured. Table 11.3.5 Allowable variations of overall verticalities and overall curvatures of plan (mm) Item Allowable variations Graphic example Overall verticality of main structure www.ChineseStandard.net H/2500±10.0 , but less than 50.0 Page 46 of 99 GB 50205-2001 Overall curvatures of plan of main structure L/1500, but less than 25.0 (II) Ordinary items 11.3.6 The surfaces of steel structure shall be clean; and in the main surfaces of steel structure, there shan’t be any scar, silt or other dirt. Quantity for inspection: inspect randomly 10% of the total of elements of every type, but not less than 3; Inspection methods: examine by eye observation. 11.3.7 For steel column and other main elements, all centerlines, benchmarks of elevation shall be marked. Quantity for inspection: inspect randomly 10% of the total of elements of every type, but not less than 3; Inspection methods: examine by eye observation. 11.3.8 The allowable variations of installation of steel elements shall be in conformity with the requirements listed in the Table E.0.5 in the Appendix E of this Code. Quantity for inspection: inspect randomly 10% of the total of elements or joints of every type, including 3 columns (at least), over 3 beams (at least), 3 joints of main beams (at least), 3 joints of secondary beams (at least), and more than 5m of steel beam bearing contour plates. Inspection methods: see the Table E.0.5 in the Appendix E of this Code 11.3.9 The allowable variations of total height of main structure shall be in conformity with the requirements listed in the Table E.0.6 in the Appendix E of this Code. Quantity for inspection: inspect randomly 10% of the total of rows of standard columns, but not less than 4; Inspection methods: measure with a pheodolite, a level gauge and steel rulers onsitely. 11.3.10 For steel elements mounted on a concrete columns, the allowable variation between the centers of base and the location axises, shall be less than 10mm; and when the large-size concrete plate is used for roof board, the allowable variations of spacing intervals of steel beams (or trusses) shall be less than 10mm. Quantity for inspection: inspect randomly 10% of the total of elements of every type, but not less than 3; Inspection methods: measure with threads and steel rulers onsitely. 11.3.11 For multilayer or high steel structures, the allowable variations of installation of steel crane beams or similar elements bearing dynamic loads shall be in conformity with the requirements listed in the Table E.0.2 in the Appendix E of this Code. Quantity for inspection: inspect randomly 10% of the total of beams of steel cranes, but not less than 3; Inspection methods: see the Table E.0.2 in the Appendix E of this Code. 11.3.12 For multilayer or high steel structures, the allowable variations of installation of purlines, wall supporter and other subordinate elements shall be in conformity with the requirements listed in the Table E.0.3 in the Appendix E of this Code. Quantity for inspection: inspect randomly 10% of the total of elements of every www.ChineseStandard.net Page 47 of 99 GB 50205-2001 type, but not less than 3; Inspection methods: see the Table E.0.3 in the Appendix E of this Code. 11.3.13 For multilayer or high steel structures, the installation of steel platforms, steel ladders and guard rails shall be in conformity with the current state standards including the Stationary-type Steel Straight Ladders (GB 4.53.1), Stationary-type Steel Agley Ladders (GB 4.53.2), Stationary-type Guard Rails (GB 4.53.3), Stationary-type Steel Platform (GB 4.53.4). For steel platforms, steel ladders and guard rails, the allowable variations of installation shall be in conformity with the related requirements in the Table E.0.4 in the Appendix E of this Code. Quantity for inspection: inspect randomly 10% of the total of platforms, but not less than 1; 10% of the total length of guard rails, but not less than 5m; 10% of the total length of steel ladder, but not less than 1 foot-step。 Inspection methods: see the Table E.0.4 in the Appendix E of this Code. 11.3.14 For multilayer or high steel structures, the allowable variations of clearances of onsite fit-up welding shall be in conformity with the requirements listed in the Table 10.3.11. Quantity for inspection: inspect randomly 10% of the total of joints of every type, but not less than 3; Inspection methods: measure with rulers. www.ChineseStandard.net Page 48 of 99 GB 50205-2001 12 Installation Work of Net-type Steel Structures 12.1 Ordinary requirements 12.1. 1 This chapter is applicable to the acceptance of installation quality of the net-type plane steel structures single-layer (shortened form: net-type steel structures), performed during construction. 12.1.2 The installation work of net-type steel structures may be divided into one or several inspection/test batches according to the deformed seams or sections of construction, and space rigid units. 12.1.3 The acceptance of inspection/test batches of net-type steel structures may be carried out after the materials or products have been admitted to enter site, and the welding work, connecting work of fasteners and fabrication have been inspected and accepted. 12.1.4 The installation of net-type steel structures shall be performed in accordance with the requirements specified in 10.1.4, 10.1.5 and 10.1.6. 12.2 Tope plates of bearing surfaces and cushion blocks (I) Main items under control 12.2.1 For the support seats of net-type steel structures, the positions of location axises and the specifications of anchor bolts of shall be in conformity with the design requirements. Quantity for inspection: inspect randomly 10% of the total of support seats, but not less than 4; Inspection methods: measure with theodolites and steel rulers onsitely. 12.2.2 For tope plates of bearing surfaces, the allowable variations of locations, elevations and levelness shall be in conformity with the related requirements listed in the Table 12.2.2; and for anchor bolts of support seats, the allowable variations of locations shall be in conformity with the related requirements listed in the Table 12.2.2, too. Quantity for inspection: inspect randomly 10% of the total of support seats, but not less than 4; Inspection methods: measure with theodolites, level gauges, leveling rods and steel rulers onsitely. Table 12.2.2 Allowable variations of locations, elevations and levelness of top plates of bearing surfaces, and allowable variations of locations of anchor bolts of support seats (mm) Item Locations 12.2.3 Tope plate of bearing surface Elevation Anchor bolt of support seat Levelness Deviation of center of bolt Allowable variations 15.0 0 -3.0 l / 1000 ±5.0 The categories/types, specifications, positions, end’s directions of cushion blocks www.ChineseStandard.net Page 49 of 99 GB 50205-2001 Inspection methods: measure with steel rulers and accessory measuring tools onsitely. Table 12.3.2 Allowable variations of intermediate assembled structures (mm) Item Length of unit (≤20m) , and assembling length Length of unit (>20m) , and assembling length Single span Continuous spans Single span Continuous spans Allowable variations ±10.0 ±5.0 ±20.0 ±10.0 12.3.3 For the net-type steel structures of the public works needing structure of the first-grade safety and over 40m (including 40m) span, the bearing capabilities of joints shall be tested according to the following items respectively where required by the design. 1. In order to test weld ball joints, weld the weld balls specified by the design and the steel tubes matching the balls together to prepare test samples, and then carry out the tensile test of axle centers as well as the bearing strength test for test samples. (Note: The breaking loads of test samples shall be more than 1.6 times of the bearing forces of design). 2. In order to test bolt ball joints, carry out tensile-tests and proof-load tests for the threads of the maximum bolt holes of the balls required by the design. (Note: when the loads reach the design bearing loads, the bolt holes, threads and closing boards shall be still in good condition.) Quantity for inspection: 3 test samples for every item of test; Inspection methods: test on one universal testing machine, and check the test report. 12.3.4 For the completed net-type steel structures and completed roofs, the corresponding lexibilities shall be measured; and the measured values shall be less than 1.1.5 times of the corresponding design values. Quantity for inspection: for every net-type steel structure with span less than 24m, 1 middle point of low boom; for every net-type steel structure with span over 24m, 1 middle point of low boom and quartering points of spans of downwards booms. Inspection methods: measure with steel rulers and level gauge onsitely. (II) Ordinary items 12.3.5 For the completed net-type steel structures, the surfaces of joints and bars shall be clean without any obvious scar, silt and dirt; and all seams of bolt ball joints shall be filled with lacquer putty sufficiently; and all surplus bolt holes shall be sealed. Quantity for inspection: inspect randomly 5% of the total of joints and bars, but not less than 10; Inspection methods: examine by eye observation. 12.3.6 The allowable variations of installation of completed steel structures shall be in conformity with the requirements listed in the Table 12.3.6. Quantity for inspection: one hundred percent other than for bowed-height of bars (randomly 5%). Inspection methods: see the Table 12.3.6. www.ChineseStandard.net Page 51 of 99 GB 50205-2001 Table 12.3.6 Allowable variations of installation of completed steel structures (mm) Item Lognitudinal length, lateral length Deviation of center of support seat Allowable variations L/2000, but less than 30.0; -L/2000, but less than -30.0 L/3000, but less than 30.0 Height difference between the neighboring support-seats of L/400, but less than 15.0 periphery net-type steel structures Biggest height difference 30.0 Height difference between the neighboring support-seats of L1 /800, but less than 30.0; several-point-supported net-type steel structure Note: 1. L is Lognitudinal length, lateral length; 2. L1 is spacing interval of neighboring support-seats www.ChineseStandard.net Inspection methods Measure with steel rulers onsitely Measure with steel rulers and theodolites onsitely Measure with steel rulers and theodolites onsitely Page 52 of 99 GB 50205-2001 13 Preparation and Installation Work of Metal Contour Plates 13.1 Ordinary requirements 13.1.1 This chapter is applicable to the acceptance of onsite preparation and installation quality of metal contour plates. 13.1.2 The preparation and installation work of metal contour plates may be divided into one or several inspection/test batches according to the corresponding deformed seams, floors, sections of construction, roofs, wall surfaces. 13.1.3 The acceptance of installation of metal contour plates shall be carried out after the corresponding inspection/test batches of installation work have been accepted. 13.2 13.2.1 Preparation of metal contour plates (I) Main items under control There shan’t be any crack in any base plate of contour plates. Quantity for inspection: inspect 5% of the total of contour plates, but not less than 10; Inspection methods: examine with eyes and 10-times hand lens. 13.2.2 There shan’t be any eye-observable crack, exfoliation, scratch or other defect in the coatings or cladding of any coated or plated contour plate completed. Quantity for inspection: inspect 5% of the total of contour plates, but not less than 10; Inspection methods: examine with eyes and 10-times hand lens. (II) Ordinary items 13.2.3 The allowable variations of sizes of metal contour plates shall be in conformity with the requirements listed in the Table 13.2.3. Quantity for inspection: inspect 5% of the total of contour plates, but not less than 10; Inspection method: examine with threads and steel rulers. 13.2.4 The surfaces of the formed metal contour plates shall be clean with out any obvious sag, crest or cockle. Quantity for inspection: inspect randomly 5% of the total of metal contour plates, but not less than 10. Inspection method: examine by eye observation. Table 13.2.3 Allowable variations of sizes of metal contour plates (mm) Item Allowable variations Wave spacing ±2.0 Height of section Wave height steel contour plates ±1.5 plane≤70 www.ChineseStandard.net Page 53 of 99 GB 50205-2001 Quantity for inspection: inspect 5% of the total lognitudinal length along the connection locations, but not less than 10m; Inspection methods: examine with eyes and steel rulers (II) Ordinary items 13.3.4 The metal contour plates shall be flat and smoothly straight without any construction residue or dirt; and their cornices and low edges of wall shall be lineal without any not-remedied falsely-drilled hole. Quantity for inspection: inspect 10% of the total area, but not less than 10m2; Inspection method: examine with eyes. 13.3.5 The allowable variations of installation of metal contour plates shall be in conformity with the requirements listed in the Table 13.3.5. Quantity for inspection: for parallelism of cornices and ridges, inspect randomly 10% of the total length, respectively, but not less than 10m; for other items, inspect 1 point every 20m, but not less than 2. Inspection method: examine with treads and rulers. Table 13.3.5 Allowable variations of installation of metal contour plates (mm) Item Parallelism of cornice and ridge Verticality between the wave-line of metal contour plate and the roof ridge Surface of roof End butt of two neighboring metal contour plates Largest wave height of edge-curling plate of metal contour plate of cornice Verticality of wave-line of wall plate Verticality of angle-wrapping plate of Surface of wall wall plate Low butt of two neighboring metal contour plates Note: 1. L is the height of half-slope of roof surface; 2. H is the height of wall surface. www.ChineseStandard.net Allowable variations 12.0 L/800, but less than 25.0 6.0 4.0 H/800, but less than 25.0 H/800, but less than 25.0 6.0 Page 55 of 99 GB 50205-2001 14 Coating Work of Steel Structure 14.1 Ordinary requirements 14.1. 1 This chapter is applicable to the acceptance of construction quality of coatings of steel structures, including the acceptance of anticorrosive coatings (such as paint) and the acceptance of fire-retardant coatings. 14.1.2 The coating work of steel structures may be divided to one or several inspection/test batches according to the same division principles adopted for the corresponding fabrication of steel structures or the corresponding inspection/tests batches of installation work. 14.1.3 The acceptance of ordinary coating work of steel structures shall be carried out after the test assembling and assembling work of steel elements, and the inspection/test batches of installation work of steel structures have been accepted. Moreover, the acceptance of fire-retardant coating work of steel structures shall be carried out after the inspection/test batches of installation work of steel structures, and the inspection/test batches of ordinary coating work of steel structures have been accepted. 14.1.4 During coating, the ambient temperature and relative humidity shall be in conformity with the related requirements specified in the instructions of coatings. If there isn’t any related requirement in the instructions, the ambient temperature shall be 5~38C; and the relative humidity shall be less than 85%; and in the surfaces of elements, there shan’t any dew. After the coating, the steel structure shall be protected against any rain for 4hrs. 14.2 Coating of anticorrosive layer of steel structure (I) Main items under control 14.2.1 Before the coating, the sand blasting shall be performed for surfaces of steel materials according to the design requirements and the related requirements specified in the related current state standard(s); and on the processed surfaces of steel materials, there shan’t be any welding slag, welding scar, dust, oily dirt, water or bur. If there isn’t any related requirement in the design, the grades of sand blasting of surfaces of steel materials shall be in conformity with the requirements listed in the Table 14.2.1. Quantity for inspection: inspect randomly 10% of the total of elements, and over 3 for every type of elements; Inspection methods: examine with broad knives, and compare with the corresponding graphic examples showed in the current state standard of the Sand Blasting Grades of Steel Materials to Be Coated, and Sand Blasting Grades (GB 8923). Table 14.2.1 Minimum Sand Blasting Grades Required for All Kinds of Primer or Antirust Paint Category of coating/paint Oily metlbond, alkyd and other primer or antirust paint Perchloric polyethylene, chlorinated rubber, chlorosulfonated polyethylene, epoxy www.ChineseStandard.net Sand Blasting Grade St2 Sa2 Page 56 of 99 GB 50205-2001 (resin), polyurethane and other primer or antirust paint Inorganic Zn-rich primer, Organosilicon primer, peroxy- ethene primer Sa 2 1 2 14.2.2 The coating materials, times of coating, and thickness of coating shall be in conformity with the design requirements. If there isn’t any related requirement in the design, the total thickness of dry paint film of coating layer shall be 150um (out room), and 125um (in room); and the allowable variation of such thickness is –25um. For every time of coating, the allowable variations of thickness of dry paint film of coating layer painted this time is –5um. Quantity for inspection: inspect randomly 10% of the total of elements, and over 3 for every type of elements; Inspection methods: measure with a paint-film thickness meter, examining 5 positions for every element. (Note: For every position, the thickness is the average of 3 values measured at 3 points apart from each other by 50mm.) (II) Ordinary items 14.2.3 In the surfaces of elements, there shan’t be any false painting, omit of painting, desquamation, rusting again, or other unacceptable condition. The coating layer shall be even without any cockle, trace of flowing or dropping, pinhole or air trap. Quantity for inspection: one hundred percent; Inspection methods: examine by eye observation. 14.2.4 If the steel structure will be situated in erosive environment or will be exposed, the adhesion test shall be performed for the steel structure one condition that the design requires. (Note: if, within the area tested, the completeness of coating layer is more than 70%, the adhesion of this coating layer is acceptable.) Quantity for inspection: inspect randomly 1% of the total of elements, but not less than 3; and inspect 2 areas for every element; Inspection methods: test in accordance with the current state standard of the Test Method for Adhesion of Paint Film (GB 1720) or the Grid Subvision Test of Color Paint, Varnish Lacquer, Paint Film (GB 9286). 14.2.5 The identification marks, badges and serial numbers in the coated steel structure shall be clear without any absence. Quantity for inspection: one hundred percent; Inspection methods: examine by eye observation. 14.3 Coating of Fire-retardant Layer of Steel Structure (I) Main items under control 14.3.1 Before the coating of fire-retardant layer, the sand blasting shall be performed for surfaces of steel materials according to the design requirements and the related requirements specified in the related current state standard(s). Quantity for inspection: inspect randomly 10% of the total of elements, and over 3 for every type of elements; www.ChineseStandard.net Page 57 of 99 GB 50205-2001 Inspection methods: examine with broad knives, and compare with the corresponding graphic examples showed in the current state standard of the Sand Blasting Grades of Steel Materials to Be Coated, and Sand Blasting Grades (GB 8923); As to primer, measure with a dry paint-film thickness meter, examining 5 positions for every element. (Note: For every position, the thickness is the average of 3 values measured at 3 points apart from each other by 50mm.) 14.3.2 The adhesive strength and compressive strength of fire-retardant coating shall be in conformity with the related requirements of the current state standard of the Technical Application Procedure of Fire-retardant Coating of Steel Structure (CECS 24:90); and the related test method shall be in conformity with the related requirements of the current state standard of the Test Methods for Performances of Fire-retardant Spray-Coating Materials of Steel Structure (GB 9978). Quantity for inspection: carry out one time of adhesive strength test for every 100tons (or less than 100tons) of fire-retardant thin-coating materials consumed; and carry out one time of adhesive strength test and one time of compressive strength test for every 500tons (or less than 500tons) of fire-retardant thick-coating materials consumed. Inspection methods: Check retest reports. 14.3.3 For fire-retardant thin-coating materials, the thickness of coating layer shall be in conformity with the design requirements on the fire endurance. For fire-retardant thick-coating materials, over 80% of coating layer shall be in conformity with the design thickness requirements on the fire endurance; and the thinnest coating layer shan’t be less than 85% of that design thickness. Quantity for inspection: inspect 10% of the total of elements of every type, but not less than 3; Inspection methods: examine with coating-film thickness meters, test pin and steel rulers according to the current state standard of the Technical Application Procedure of Fire-retardant Coating of Steel Structure (CECS 24:90) and the Appendix E of this Code. 14.3.4 For fire-retardant thin-coating materials, the width of crack in the surfaces of coating layer shan’t be larger than 0.5mm; For fire-retardant thick-coating materials, 1mm. Quantity for inspection: inspect 10% of the total of elements of every type, but not less than 3; Inspection methods: examine with eyes and rulers. (II) Ordinary items 14.3.5 In the base layer of fire-retardant coating, there shan’t be any oily dirt, dust, silt or other dirt. Quantity for inspection: one hundred percent; Inspection methods: examine by eye observation. 14.3.6 For fire-retardant coating, the false coating and omit of coating isn’t allowed; and the coating layer shall be closed without any delamination, hollow bulge, obvious concave, powdery loose, floating paste or other apparent defect; moreover, all small protuberances in the surface of coating layer shall be removed. Quantity for inspection: one hundred percent; Inspection methods: examine by eye observation. www.ChineseStandard.net Page 58 of 99 GB 50205-2001 15 Final Acceptance of Subitem-works of Steel Structure 15.0.1 According to the requirements specified in the current state standard of the Uniform Standard of Acceptance of Construction Quality of Steel Structures (GB 50300), steel structure, as one of the main structures of building, shall be inspected and accepted as one section of the whole works. If all main structures of building are steel structures, these structures shall be inspected and accepted as sections of the whole works. Large-size steel structure may be divided to several subsections for final acceptance. 15.0.2 See the Appendix G of this Code for the safety test, functionality test, and witness of inspection items needing witness for section of steel structure. The safety test and functionality test shall be carried out after the subitem-work of steel structure has been accepted. 15.0.3 The quality test of visual sensation of steel structure shall be performed in accordance with the Appendix E of this Code. 15.0.4 The quality of sections of steel structure shall be in conformity with the following requirements: 1 All sections of steel structures shall be in conformity with the related quality standards; 2 The quality control documents/information shall be complete; 3 The results of safety tests, functionality test and test items needing witness shall be in conformity with the related quality requirements set forth in this Code; 4 The visual sensation of appearance shall be in conformity with the related quality requirements set forth in this Code. 15.0.5 For the final acceptance of sections of steel structure, the following shall be provided: 1. As-built drawing of steel structure, and related design documents; 2. Records of onsite quality control and inspection; 3. Records of safety tests, functionality tests, and inspection/test item needing witness; 4. Records of examination items of visual sensation of appearance; 5. Records of acceptances of subitem-works included in section of steel structure; 6. Records of acceptances of inspection/test batches included in subitem-works; 7. Inspection records and documentary evidences of inspection items specified in mandatory clauses; 8. Acceptance Records of inspection items of concealed work 9. Certificates, Chinese identification marks, and performance test reports of raw materials and finished products; 10. Records of remedies of unconformities, and acceptance records of remedied unconformities. 11. Execution schemes and acceptance records of key quality or technical measures; 12. Other related documents and records. www.ChineseStandard.net Page 59 of 99 GB 50205-2001 15.0.6 The records of quality acceptance of steel structure shall be in conformity with the following requirements: 1. Records of onsite quality control and inspection shall be in conformity with the requirements specified in the Appendix A of the current state standard of the Uniform Standard of Acceptance of Construction Quality of Steel Structures (GB 50300). 2. Records of acceptances of inspection/test batches included in subitem-works shall be in conformity with the requirements specified in the Tables of J.0.1 ~ J0.13 of the Appendix J in this Code. 3. Records of acceptances of subitem-works shall be in conformity with the requirements specified in the Appendix E of the current state standard of the Uniform Standard of Acceptance of Construction Quality of Steel Structures (GB 50300). 4. Records of acceptances of section or subsection of steel structure shall be in conformity with the requirements specified in the Appendix F of the current state standard of the Uniform Standard of Acceptance of Construction Quality of Steel Structures (GB 50300). www.ChineseStandard.net Page 60 of 99 GB 50205-2001 Appendix A Quality Standard of Appearance of Welding Seam, and Allowable Variations of Sizes of Welding Seam A.0.1 The appearance quality of the second-grade or third-grade seams shall be in conformity with the requirements listed in the Table A.0.1. Table A.0.1 Standard of appearance quality of the second-grade or third-grade seams (mm) Item Type of defect Insufficient welding (i.e., welding unable to meet the design requirement completely) Allowable variations Second-grade Third-grade ≤ 0.2+0.02t,and ≤ 1.0 ≤ 0.2+0.04t,and ≤ 2.0 Total length of inner defects of every 100 seam ≤25.0 ≤ 0.2+0.02t,and ≤ 1.0 ≤ 0.2+0.04t,and ≤ 2.0 No special limit for length ≤ 0.05t, and ≤ 0.5, continuous ≤ 0.1t, and ≤ 1.0, no limit for length≤ 100.0, total length of two Overmask length sides of overmask shall be less than 10% of the total length of seam. 1~2 cracks (length ≤5.0) of arc Crack of arc pit -pit, Arc-caused scratch -1~2 Depth of nick≤ 0.05t, and ≤ 0.5 Depth of nick≤ 0.1t, and ≤ 1.0 Unsatisfying joint For every 1000 seams, ≤ 1 Depth ≤ 0.2t, Length ≤ 0.5t, Included slag in surface -≤ 20.0 For every 50 seams, air holes (Diameter ≤0.4t, H≤3.0) ≤2, Air trap in surface -and distance between any two air holes shall be less than 6 times of diameter. Note: t is the thickness of the thinner plate at the joint Contraction of root A.0.2 The allowable variations for sizes of butt-jointed welding seams and combined penetration welding seams shall be in conformity with the requirements listed in the Table A.0.2. Table A.0.2 Allowable variations for sizes of butt-jointed welding seams and combined penetration welding seams (mm) No. Item Graphic examples Allowable variations First-grade, Third-grade second-grade Height allowance of 1 B<20:0-3.0 B<20:0-4.0 butt-jointed welding seam B≥20:0-4.0 B≥20:0-5.0 d<0.15t d<0.15t Side Misalignment at 2 butt-jointed welding seam ≤2.0 ≤3.0 A.0.3 The allowable variations for sizes of combined partial-penetration welding seams and fillet welds (seams) shall be in conformity with the requirements listed in the Table A.0.3. Table A.0.3 Allowable variations for sizes of combined partial-penetration welding seams and fillet welds (mm) No. Item Graphic examples Allowable variations hf≤6:0-1.5 1 Sizes of leg hf hf>6:0-3.0 www.ChineseStandard.net Page 61 of 99 GB 50205-2001 Height allowance of fillet weld hf≤6:0-1.5 (seam) hf>6:0-3.0 Note: 1. For fillet welds (seams) of “hf > 8.0mm”, it is allowed for parts of leg to be smaller than the design value, i.e., 1.0mm, but the total length of such legs shall be less than 10% of the total length of seam. 2. For H-shape beam, the leg within the two times of width of flange plate shall be larger than the design value at the two ends of seam between stalk plate and flange plate. 2 www.ChineseStandard.net Page 62 of 99 GB 50205-2001 Appendix B Inspection Items of Connecting of Fastener B.0.1 Minimum load test of bolt Purposes: measure the tensile strength of bolt and verify if it is able to meet the requirements specified in the current state standard of the Mechanical Performances of Fasteners – Bolts, Screws, and Double Screw Bolts (GB 3098). Inspection method: Position bolt on a tensile tester with special fixtures, and then carry out the test. In order to prevent the bolt to be tested from any bearing lateral load, the fixture of tensile tester shall be able to adjust the center automatically, and the movement speed of f grip holder shall be less than 25mm/min during test. The tensile strength of bolt shall be determined by calculation based on the area of stress-bearing sectional plane of thread (As) and according to the requirements specified in the current state standard of the Mechanical Performances of Fasteners – Bolts, Screws, and Double Screw Bolts (GB 3098). During test, the length of not-screwed threads bearing load shall be more than 6 times of screw pitch; and when the test tensile reaches the minimum tensile load (As, σ b) specified in the current state standard of the Mechanical Performances of Fasteners – Bolts, Screws, and Double Screw Bolts (GB 3098), the bolt shan’t crack; and when the bolt crack/breaks due to the test tensile exceeding the minimum tensile load (As, σb), the cracking/breaking position shall be in the stem (including screw), but not the joint between stem and head. B.0.2 Pre-tensile retest of set of torsion-shear-type high strength bolt The test samples (bolts sampled for test) for retest shall be sample randomly from the bolts kept at the construction site. For every batch of sets of torsion-shear-type high strength bolt, sample 8 sets for retest. The pre-tensile of such sets may be test with an axial-force meter verified and calibrated to be qualified. The measurement instruments including electric axial-force meter, oil-pressure axial-force meter, resistance deformeter, torque wrench, shall be standardized before the test; and the errors of such instruments standardized shall be less than 2%. During using an electric axial-force meter to retest the pre-tensile of set of bolt, the bolt shall be inserted into the axial-force meter directly; and the bolt shall be screwed by two times (i.e., opening screw and completing screw). The opening screw shall be performed with a manual torque wrench or a special-purpose torque-set electric wrench; and the torque of opening screw shall be about 50% of the standard value of pre-tensile. The completing screw shall be carried out with a special-purpose electric wrench until the wabbler of bolt is screwed off; then the pre-tensile shall be read and recorded. Every set of bolt can only be tested for one time. Moreover, if the gasket rotates during the screw, the set of bolt shall be replaced by a new set of bolt; and the test shall be carried out again. The average of the pre-tensile values of bolts retested and the related standard variations shall be in conformity with the requirements listed in the Table B.0.2. www.ChineseStandard.net Page 63 of 99 GB 50205-2001 Appendix C Allowable Variations for Assembly of Steel Structure C.0.1 The allowable variations of H-shape weldable steep shall be in conformity with the requirements listed in the Table C.0.1 (mm) Table C.0.1 Allowable variations of H-shape weldable stee (mm) Width of section plane, b Allowable variations ±2.0 ±3.0 ±4.0 ±3.0 Deviation of center of stalk plate 2.0 Item Height of section plane, h’ h 500 500 h 1000 h 1000 Verticality of flange plate, b/100, but less than 3.0 Bowed-height (except the elements bearing press) Distortion h/250, but less than 5.0 Local planness of stalk plate, f Graphic example t 14 t 14 l / 1000 , but less than 1.0 h / 250 3.0 2.0 C.0.2 The allowable variations of assembly of welding shall be in conformity with the requirements listed in the Table C.0.2. Table C.0.2 Allowable variations of assembly of welding (mm) Item Side misalignment at butt joint Clearance, a Length of splice Gap, Height, h Verticality, Deviation of center, e Joint Misalignment of section steel Other locations Height of case-shape section-plane, h Width, b Verticality, Allowable variations t/10, but less than 3.0 ±1.0 ±5.0 1.5 ±2.0 t/100, but less than 3.0 ±2.0 1.0 2.0 ±2.0 ±2.0 t/200, but less than 3.0 Graphic example C.0.3 The allowable variations of overall dimensions of single-layer columns shall be in conformity with the requirements listed in the Table C.0.3. Table C.0.3 Allowable variations of overall dimensions of single-layer columns (mm) Item Allowable variations Test method Distance between the column bottom and the upperest mounting-hole connecting column upper end and truss, l l / 1500 15.0 Measure with rulers www.ChineseStandard.net Graphic example Page 68 of 99 GB 50205-2001 Distance between the bottom column and the bearing surface of cantilever bracket, l1 Warp of surface of cantilever bracket, Bowed-height of column Distortion of body of column Area where cantilever bracket locates Other Joint Geometric dimensions of Non-joint section plane Joint Verticality between the flange plate and Other the stalk plate Planness of bottom plate of column bottomstand Distance between the center of bolt hole located at column bottom stand and the axial line of column l1 / 2000 8.0 2.0 H/1200, but less than 12.0 3.0 Measure with L squares and steel rulers Measure with thread and rulers 8.0 ±3.0 ±4.0 Measure with steel rulers 1.5 b/100, but less than 5.0 Measure with threads and steel rulers 5.0 Measure with 1m-range L squares and steel rulers 3.0 Measure with rulers C.0.4 The allowable variations of overall dimensions of multi-layer columns shall be in conformity with the requirements listed in the Table C.0.4. www.ChineseStandard.net Page 69 of 99 GB 50205-2001 Table C.0.4 Allowable variations of overall dimensions of multi-layer columns (mm) Item Height of one layer of column, H Distance between the lateral mounting holes closest to the two ends respectively, Bowed-height of column body, f Distortion of one layer of column body Distance between the end hole of cantilever bracket and the axial line of column, l2 Warp or distortion of l 2 1000 cantilever bracket, l 2 1000 Joint Sizes of section plane other Planness of bottom plate of column bottomstand Joint Verticality between the flange plate and Other the stalk plate Distance between the bolt hole of column bottomstand and the axial line of column, a Difference between the diagonals of case-shape section-plane Verticality of the body plate of case-shape column Test method Measure with threads and steel rulers ±1.0 Measure with threads and steel rulers H/1500, but less than 5.0 h/250, but less than 5.0 ±3.0 2.0 3.0 Graphic example Measure with steel rulers ±2.0 l3 Distance between the milled surface and the first mounting hole, a Allowable variations ±3.0 Measure with steel rulers Measure with threads, L squares and steel rulers Measure with steel rulers Measure with threads, L squares and steel rulers ±3.0 ±4.0 Measure with steel rulers 5.0 Measure with rulers and clearance gauges 1.5 h/100, but less than 5.0 Measure with L squares and steel rulers 3.0 Measure with steel rulers 3.0 H(b)/150, but less than 5.0 Measure with L squares and steel rulers C.0.5 The allowable variations of overall dimensions of weldable steel plain web beams shall be in conformity with the requirements listed in the Table C.0.5. www.ChineseStandard.net Page 70 of 99 GB 50205-2001 Table C.0.5 Allowable variations of overall dimensions of weldable steel plain web beams (mm) Allowable variations Item Length of beam, l Beam has flange support plate at its ends Height of end, h Arching factor Harch camber required by the design Harch camber not required by the design Lateral bowed-height Distortion t 14 t 14 Local planness of stalk plate l / 2500 Measure with steel rulers ±10.0 ±2.0 ±3.0 l / 5000 10.0 -5.0 Measure with threads and steel rulers l/2000, but less than 10.0 h/250, but less than 10.0 5.0 4.0 Verticality between the flange plate and the stalk plate b/100, but less than 3.0 Planness of crane beam’s flange surface contacting the railway 1.0 Difference between the diagonals of case-shape section-plane Distance between every Joint stalk plate of case-shape section-plane and the Other centerline of flange plate of such section-plane, a Planness of flange plate (only concave is allowed) Verticality between the flange plate and the stalk plate Graphic example 0 -5.0 Other h 2000 h 2000 Test method Measure with threads and steel rulers Measure with 1m-range rulers and clearance gauges Measure with L square and steel rulers Measure with 200mm or 1m-range rulers and clearance gauges 5.0 1.0 Measure with steel rulers 1.5 h/500, but less than 2.0 h/500, but less than 2.0 Measure with L squares and steel rulers Measure with L squares and steel rulers C.0.6 The allowable variations of overall dimensions of steel trusses shall be in conformity with the requirements listed in the Table C.0.6. Table C.0.6 Allowable variations of overall dimensions of steel trusses (mm) Item Distance between the outsides of l 24m truss’s two holes nearest to the ends respectively, or distance between the outside sides of truss’s two bearing l 24m surfaces Height of the middle of truss’s span Harch camber required by the design Arching factor of the middle of truss’s span Harch camber not required by the design Bending of chord between two neighboring units (except bending caused by press) Distance between the bearing surface and the first mounting hole, a www.ChineseStandard.net Allowable variations +3.0 -7.0 Test method Graphic example +5.0 -10.0 ±10.0 l / 5000 Measure with steel rulers 10.0 -5.0 l / 1000 ±1.0 Measure with steel rulers Page 71 of 99 GB 50205-2001 Spacing interval of purline support-seats ±5.0 C.0.7 The allowable variations of overall dimensions of steel-tube elements shall be in conformity with the requirements listed in the Table C.0.7. Table C.0.7 Allowable variations of overall dimensions of steel-tube elements (mm) Item Allowable variations Diameter, d d / 500 5.0 Test method Length of element, l Roundness of tube mouth Verticality between the tube surface and the tube axis ±3.0 d / 500, but less than 5.0 Measure with steel rulers d / 500, but less than 3.0 Bowed height l / 1500 , but less than 5.0 Measure with welding seam gage Measure with threads and steel rulers Misalignment of butt joint t / 10 m, but less than 3.0 Graphic example Measure with threads and steel rulers Note: For rectangular tubes, d is the length of long side. C.0.8 The allowable variations of overall dimensions of wall supporters, purlines, and other steel elements of support system shall be in conformity with the requirements listed in the Table C.0.8. Table C.0.8 Allowable variations of overall dimensions of wall supporters, purlines, and other steel elements of support system (mm) Item Allowable variations Length of element ±4.0 Distance between the element’s two mounting ±3.0 holes nearest to the sides/ends respectively Bowed-length of element l/1000, but less than 10.0 +5.0 Dimensions of section plane -2.0 Inspection/test method Measure with steel rulers Measure with threads and steel rulers Measure with steel rulers C.0.9 The allowable variations of overall dimensions of steel platforms, steel ladders and guard rails shall be in conformity with the requirements listed in the Table C.0.9. Table C.0.9 Allowable variations of overall dimensions of steel platforms, steel ladders and guard rails (mm) Item Allowable variations Test method Length and width of platform ±5.0 Measure with steel rulers Difference between the two diagonals of platform [l1-l2] Height of platform’s support column Bowed-height of platform’s support column Planness of platform’s surface (within 1m2 range) 6.0 ±3.0 5.0 6.0 Length of steel ladder’s beam, l ±5.0 Width of steel ladder, b ±5.0 Distance between the mounting holes of steel ladder, a ±3.0 Bowed-height of steel ladder’s lognitudinal deflection l/1000 www.ChineseStandard.net Graphic example Measure with threads and steel rulers Measure with 1m-range rulers and clearance gauges Measure with steel rulers Measure with threads and steel rulers Page 72 of 99 GB 50205-2001 Spacing interval of ladder’s foot step Height of guard rail Spacing interval of columns supporting rails www.ChineseStandard.net ±5.0 ±5.0 Measure with steel rulers ±10.0 Page 73 of 99 GB 50205-2001 Appendix E Allowable Variations for Installation of Steel Structure E.0.1 The allowable variations of test assembling of steel elements shall be in conformity with the requirements listed in the Table E.0.1. Table E.0.1 Allowable variations of test assembling of steel elements (mm) Allowable variations Item +3.0 -5.0 Bow-height H/1200, but less than 15.0 Verticality of column’s axis Deviation of centerline of bottom seat of column from the location axis Column with crane Elevation of beam column’s Column benchmark with no crane beam Single-la yer column Multi-lay er column Graphic example 5.0 Measure with threads and steel rulers +5.0 -8.0 H≤10m H/1000 H>10m H/1000, but less than 25.0 One layer of column Total height of column Test method H/1000, but less than 10.0 Measure with a level gauge. Measure with a theodolite, or measure or with threads and steel rulers 35.0 E.0.2 The allowable variations of installation of steel crane beams shall be in conformity with the requirements listed in the Table E.0.2. www.ChineseStandard.net Page 75 of 99 GB 50205-2001 Table E.0.2 Allowable variations of installation of steel crane beams (mm) Allowable variations Item Verticality of the middle of beam’s span, Graphic example Measure with threads and steel rulers l / 1500 Lateral bowed-height Vertical and upward bowed-height Deviation from the center of bracket when mounted on steel Displacement of column the center of seat supporting Deviation from beam end the location axises when mounted on concrete column Deviation of the center of stiffener plate of crane beam’s seat from the center of stiffener plate supporting column Height Areas where difference support seats between the top locats surfaces of crane beams of the same span Other areas and section plane, h / 500 Test method , but less than 10.0 10.0 5.0 5.0 t/2 same span and section plane, Height difference between the top surfaces of two neighboring crane beams of the same row, Misalignment of centers Height difference between the top Joint between surfaces bearing two neighboring loads crane beams Height difference between the bottom surfaces bearing loads Central span of crane beams of the same span and section plane, Deviation of railway center from the axis of crane beam’s stalk plate Measure with threads and steel rulers 10.0 15.0 Height difference between the bottom surfaces of hung crane beams of the Measure with steel rulers Measure with a theodolite, a level gauge and steel rulers 10.0 l / 1500 , but less than 10.0 Measure with a level gauge and steel rulers 3.0 1.0 Measure with steel rulers 1.0 10.0 Measure with a theodolite, a level gauge and DC-electric range-finder ( or measure with steel rulers when the span is small) t/2 Measure with threads and steel rulers E.0.3 The allowable variations of installation of wall supporters, purlines and other secondary elements shall be in conformity with the requirements listed in the Table E.0.3. www.ChineseStandard.net Page 76 of 99 GB 50205-2001 Table E.0.3 Allowable variations of installation of wall supporters, purlines and other secondary elements (mm) Item Allowable variations Inspection/test method Deviation of centerline from 10.0 Measure with steel rulers the location axis Column of wall Measure with a theodolite, threads and Vertocality H/1000, but less than 10.0 supporter steel rulers Measure with a theodolite, threads and Bowed-height H/1000, but less than 15.0 steel rulers Verticality of wind-bearable truss h/750, but less than 15.0 Measure with threads and steel rulers Spacing interval between purlines Measure with steel rulers ±5.0 or wall supporters Bowed-height of purline L/750, but less than 12.0 Measure with threads and steel rulers Bowed-height of wall supporter L/750, but less than 10.0 Measure with threads and steel rulers Note: 1. H is the height of wall supporter’s column; 2. h is the height of wind-bearable truss; 3. L is the length of purline or wall beam. E.0.4 The allowable variations of installation of steel platforms, steel ladders and guard rails shall be in conformity with the requirements listed in the Table E.0.4. Table E.0.4 Allowable variations of installation of steel platforms, steel ladders and guard rails (mm) Item Allowable variations Inspection/test method Height of platform Measure with level gauges ±15.0 Levelness of platform l/1000, but less than 20.0 Measure with level gauges H/1000, but less than Measure with a theodolite, Verticality of platform’s column 15.0 threads and steel rulers Measure with threads and Lateral bending of platform’s beam bearing load l/1000, but less than 10.0 steel rulers Measure with threads and Verticality of platform’s beam bearing load h/250, but less than 15.0 steel rulers Measure with threads and Verticality of straight ladder l/1000, but less than 10.0 steel rulers Height of guard rail Measure with steel rulers ±15.0 Spacing interval of columns supporting guard rails Measure with steel rulers ±15.0 E.0.5 The allowable variations of installation of elements of multi-layer or high steel structures shall be in conformity with the requirements listed in the Table E.0.5. www.ChineseStandard.net Page 77 of 99 GB 50205-2001 Table E.0.5 Allowable variations of variations of installation of elements of multi-layer or high steel structures (mm) Allowable Item Test method Inspection/test method variations Misalignment at the joint between the upper column and Measure with steel rulers 3.0 the column under it, Height difference between the tope surfaces of any two 5.0 Measure with steel level gauges columns of the same layer, Height difference between the l/1000, but less tope surfaces of the two ends of Measure with steel level gauges than 10.0 the same column, Height difference between the main beam’s surface and the Measure with rulers steel rulers ±2.0 secondary beam’s surface, Misalignment of the neighboring rows of metal contour plates 15.00 Measure with rulers steel rulers mounted on steel beam , E.0.6 The allowable variations of total height of main structures/bodies of multi-layer or high steel structures shall be in conformity with the requirements listed in the Table E.0.6. Table E.0.6 Allowable variations of total height of main structures/bodies of multi-layer or high steel structures (mm) Item Allowable variations Graphic exapmle Installation controlled by relative h z w elevations Installation controlled by design H/1000, but less than 30.0; elevations -H/1000, but less than -30.0 h is the allowable variation of manufacturing of every sub-column; 2. z is every sub-column’s length-contraction caused by load; 3. w is the contraction of welding seam of every sub-column’s joint; Note: 1. www.ChineseStandard.net Page 78 of 99 GB 50205-2001 Appendix H Examination Items of Visual Sensation of Steel Structures H.0.1 For sections or subsections of steel structures, the examination items of visual sensation shall be performed according to the Table H. Table H Examination items of visual sensation of sections or subsections of steel structures No. 1 2 3 4 Surface of ordinary coating Surface of fire-retardant coating Surface of metal contour plate Quantity for inspection/examination, inspection/examination method(s) Examine randomly 3 axisymmetric elements Examine randomly 3 axisymmetric elements Examine randomly 3 metal contour plates between axises Platform, steel ladder, steel guard rail Inspect randomly 10 % of the total Item www.ChineseStandard.net Quality standard Remarks Clause 14.2.3 of this Code Clause 14.3.4, 14.3.5 and 14.3.6 of this Code Clause 13.3.4 of this Code These elements shall be connected/assembled firmly without any obvious appearance defect. Page 81 of 99 GB 50205-2001 Appendix J Record Forms for Batch Quality Acceptance of Steel Structures J.0.1 For welding of steel elements, one subitem-work of steel structure, the acceptance of batch quality shall be carried out according to the Table J.0.1. www.ChineseStandard.net Page 82 of 99 GB 50205-2001 J.0.3 For connection of ordinary fasteners (one subitem-work of steel structure), the acceptance of batch quality shall be carried out according to the Table J.0.3. Table J.0.3 Records of the batch quality acceptance of connection of ordinary fasteners (one subitem-works of steel structure) Name of project Construction organization Supervision organization Applicable construction standard(s) Main item under control 1 Admittance of finished products 2 Retest of bolts 3 Matching and spacing intervals Ordinary item 1 Fastening of bolt 2 Appearance quality Construction organization’s evaluation results based on tests/examination Quality standard (this Code) Remarks Clause 4.4.1 Clause 6.2.1 Clause 6.2.2 Quality standard (this Code) Construction organization’s evaluation records/results based on tests/examination Supervision organization’s (client’s) acceptance records and results Remarks Clause 6.2.3 Clause 6.2.4 Forman: Quality inspector: Technical forman: Technical chief of project: Date: Supervision organization’s (client’s) acceptance conclusions Construction organization’s evaluation records/conclusions based on tests/examination Location of inspection/test batch Project manager General supervisor (quality engineer) Chief of subcontractor Supervision organization’s (client’s) acceptance records and conclusions Date: Supervisor/ quality engineer (Client’s technical personnel of project): Date: www.ChineseStandard.net Page 85 of 99 GB 50205-2001 J.0.4 For connection of high strength bolts, one subitem-work of steel structure, the acceptance of batch quality shall be carried out according to the Table J.0.4. Table J.0.4 Records of the batch quality acceptance of connection of high strength bolts (one subitem-works of steel structure) Construction organization’s evaluation records/conclusio ns based on tests/examination Location of inspection/test batch Project manager General supervisor (quality engineer) Chief of subcontractor Supervision organization’s (client’s) acceptance records and conclusions Construction organization’s evaluation records/results based on tests/examination Supervision organization’s (client’s) acceptance records and results Name of project Construction organization Supervision organization Applicable construction standard(s) Main item under control 1 2 3 4 Admittance of finished products Retest of torque coefficient or pre-tensile Test of slip coefficient of faying surface Torque of completing screw Ordinary item 1 2 3 4 5 6 7 Package of finished products Hardness test of surface Torque of opening wrench, and torque of completing wrench Appearance quality of connection area Appearance of faying surface Expansion of bolt hole Fastening of bolts in net-type structure Construction organization’s evaluation results based on tests/examination Quality standard (this Code) Clause 4.4.1 Clause 4.4.2, or Clause 4.4.3 Clause 6.3.1 Clause 6.3.2 or Clause 6.3.3 Quality standard (this Code) Remarks Clause 4.4.4 Clause 4.4.5 Clause 6.3.4 Clause 6.3.5 Clause 6.3.6 Clause 6.3.7 Clause 6.3.8 Forman: Quality inspector: Technical forman: Technical chief of project: Date: www.ChineseStandard.net Remarks Date: Page 86 of 99 GB 50205-2001 Supervision organization’s (client’s) acceptance conclusions Supervisor/ quality engineer (Client’s technical personnel of project): Date: www.ChineseStandard.net Page 87 of 99 GB 50205-2001 J.0.5 For processing of parts and components, one subitem-work of steel structure, the acceptance of batch quality shall be carried out according to the Table J.0.5. Table J.0.5 Records of the batch quality acceptance of processing of parts and components (one subitem-works of steel structure) Location of inspection/test batch Project manager General supervisor (quality engineer) Chief of subcontractor Name of project Construction organization Supervision organization Applicable construction standard(s) Main item under control Quality standard (this Code) 1 2 3 Admittance of materials Retest of steel materials Quality of cut surface Clause 4.2.1 Clause 4.4.2 Clause 7.2.1 4 Rectification and formation Clause 7.3.1 and Clause 7.3.2 5 Edge treatment Clause 7.4.1 6 Preparation of bolt balls and weld balls Clause 7.5.1 and 7.5.2 7 Processing of holes Clause 7.6.1 Ordinary item 1 2 Specifications and sizes of materials Appearance quality of steel materials 3 Accuracy of cutting 4 Quality of rectification 5 6 7 8 Accuracy of edge treatment Accuracy of bolt ball preparation, accuracy of weld ball preparation Accuracy of bar/tube processing Accuracy of hole processing Construction organization’s evaluation results based on tests/examination Quality standard (this Code) Supervision organization’s (client’s) acceptance records and conclusions Remarks Construction organization’s evaluation records/results based on tests/examination Supervision organization’s (client’s) acceptance records and results Remarks Clause 4.2.3 and 4.2.1 Clause 4.2.5 Clause 7.2.2 or 7.2.3 Clause 7.3.3, 7.3.4 and 7.3.5 Clause 7.4.2 Clause 7.5.3 and 7.5.4 Clause 7.5.5 Clause 7. 6.2 and 7.6.3 Forman: Quality inspector: Technical forman: Technical chief of project: Date: Supervision organization’s (client’s) acceptance conclusions Construction organization’s evaluation records/conclusions based on tests/examination Date: Supervisor/ quality engineer (Client’s technical personnel of project): Date: www.ChineseStandard.net Page 88 of 99 GB 50205-2001 J.0.7 For test assembling, one subitem-work of steel structure, the acceptance of batch quality shall be carried out according to the Table J.0.7. Table J.0.7 Records of the batch quality acceptance of test assembling (one subitem-works of steel structure) Construction organization’s evaluation records/conclusion s based on tests/examination Location of inspection/test batch Project manager General supervisor (quality engineer) Chief of subcontractor Supervision organization’s (client’s) acceptance records and conclusions Construction organization’s evaluation records/results based on tests/examination Supervision organization’s (client’s) acceptance records and results Name of project Construction organization Supervision organization Applicable construction standard(s) Main item under control Quality standard (this Code) Bolt holes of multi-layer pile of plate Clause 9.2.1 1 Ordinary item 1 Accuracy of test assembling Construction organization’s evaluation results based on tests/examination Quality standard (this Code) Remarks Clause 9.2.2 Forman: Quality inspector: Technical forman: Technical chief of project: Date: Supervision organization’s (client’s) acceptance conclusions Remarks Date: Supervisor/ quality engineer (Client’s technical personnel of project): Date: www.ChineseStandard.net Page 90 of 99 GB 50205-2001 J.0.10 For installation of net-type structure, one subitem-work of steel structure, the acceptance of batch quality shall be carried out according to the Table J.0.10. Table J.0.10 Records of the batch quality acceptance of installation of net-type structure (one subitem-works of steel structure) Location of inspection/test batch Project manager General supervisor (quality engineer) Chief of subcontractor Name of project Construction organization Supervision organization Applicable construction standard(s) Main item under control 1 2 Weld balls Bolt balls 4 Closing boards, flare heads, sleeves Rubber mat 5 Acceptance of base 6 Support seat 3 7 8 9 Accuracy of assembling/assembly Bearing force test of nodal joint Flexibility of structure Ordinary item 1 2 3 4 5 6 Accuracy of weld bolt Accuracy of bolt ball Accuracy of thread of bolt ball Accuracy of bolt Surface of structure Accuracy of installation Construction organization’s evaluation results based on tests/examination Quality standard (this Code) Supervision organization’s (client’s) acceptance records and conclusions Remarks Construction organization’s evaluation records/results based on tests/examination Supervision organization’s (client’s) acceptance records and results Remarks Clause 4.5.1, 4.5.2 Clause 4.6.1, 4.6.2 Clause 4.7.1, 4.7.2 Clause 4.10.1 Clause 12.2.1, 12.2.2 Clause 12.2.3, 12.2.4 Clause 12.3.1, 12.3.2 Clause 12.3.3 Clause 12.3.4 Quality standard (this Code) Clause 11.2.5 Clause 11.3.7 Clause 11.3.5, 11.3.10 Clause 11.3.9 Clause 11.3.11 Clause 11.3.12 Forman: Quality inspector: Technical forman: Technical chief of project: Date: Supervision organization’s (client’s) acceptance conclusions Construction organization’s evaluation records/conclusions based on tests/examination Date: Supervisor/ quality engineer (Client’s technical personnel of project): Date: www.ChineseStandard.net Page 93 of 99 GB 50205-2001 J.0.11 For metal contour plate, one subitem-work of steel structure, the acceptance of batch quality shall be carried out according to the Table J.0.11. Table J.0.11 Records of the batch quality acceptance of metal contour plate (one subitem-works of steel structure) Location of inspection/test batch Project manager General supervisor (quality engineer) Chief of subcontractor Name of project Construction organization Supervision organization Applicable construction standard(s) Main item under control 1 2 3 4 5 6 Admittance of contour plate Cracks of base palte Defects in coating layer Onsite installation Lapping Anchoring of end Quality standard (this Code) Accuracy of metal contour plate Clause 4.8.3 2 Accuracy of rolling 5 Construction organization’s evaluation results based on tests/examination Supervision organization’s (client’s) acceptance records and results Remarks Clause 13.2.3, 13.2.5 Clause 13.2.4 Clause 13.3.4 Clause 13.3.5 Forman: Quality inspector: Technical forman: Technical chief of project: Date: Supervision organization’s (client’s) acceptance conclusions Construction organization’s evaluation records/results based on tests/examination Clause 13.3.1 Clause 13.3.2 Clause 13.3.3 1 4 Remarks Clause 13.2.2 Ordinary item Quality of surface Quality of installation Accuracy of installation Supervision organization’s (client’s) acceptance records and conclusions Clause 4.8.1, 4.8.2 Clause 13.2.1 Quality standard (this Code) 3 Construction organization’s evaluation records/conclusion s based on tests/examination Date: Supervisor/ quality engineer (Client’s technical personnel of project): Date: www.ChineseStandard.net Page 94 of 99 GB 50205-2001 J.0.12 For coating of anticorrosive layer, one subitem-work of steel structure, the acceptance of batch quality shall be carried out according to the Table J.0.12. Table J.0.12 Records of the batch quality acceptance of coating of anticorrosive layer (one subitem-works of steel structure) Location of inspection/test batch Project manager General supervisor (quality engineer) Chief of subcontractor Name of project Construction organization Supervision organization Applicable construction standard(s) Main item under control 1 Admittance of products/materials 2 Surface treatment 3 Thickness of coating layer Ordinary item 1 Admittance of products/materials 2 Quality of surface 3 Test of adhesion 4 Identification marks Construction organization’s evaluation results based on tests/examination Quality standard (this Code) Supervision organization’s (client’s) acceptance records and conclusions Remarks Construction organization’s evaluation records/results based on tests/examination Supervision organization’s (client’s) acceptance records and results Remarks Clause 4.0.1 Clause 14.2.1 Clause 14.2.2 Quality standard (this Code) Clause 4.9.3 Clause 14.2.3 Clause 14.2.4 Clause 14.2.5 Forman: Quality inspector: Technical forman: Technical chief of project: Date: Supervision organization’s (client’s) acceptance conclusions Construction organization’s evaluation records/conclusion s based on tests/examination Date: Supervisor/ quality engineer (Client’s technical personnel of project): Date: www.ChineseStandard.net Page 95 of 99 GB 50205-2001 J.0.13 For coating of fire-retardant layer, one subitem-work of steel structure, the acceptance of batch quality shall be carried out according to the Table J.0.13. Table J.0.13 Records of the batch quality acceptance of coating of fire-retardant layer (one subitem-works of steel structure) Name of project Construction organization Supervision organization Applicable construction standard(s) Main item under control 1 2 Admittance of products/materials Acceptance of primer of coating layer 3 Strength test 4 Thickness of coating layer 5 Cracks in surface Ordinary item 1 Admittance of products/materials 2 Quality of primer 3 Quality of surface of coating layer Construction organization’s evaluation results based on tests/examination Quality standard (this Code) Remarks Clause 4.9.2 Clause 14.3.1 Clause 14.3.2 Clause 14.3.3 Clause 14.3.4 Quality standard (this Code) Construction organization’s evaluation records/results based on tests/examination Supervision organization’s (client’s) acceptance records and results Remarks Clause 4.9.3 Clause 14.3.5 Clause 14.3.6 Forman: Quality inspector: Technical forman: Technical chief of project: Date: Supervision organization’s (client’s) acceptance conclusions Construction organization’s evaluation records/conclusions based on tests/examination Location of inspection/tes t batch Project manager General supervisor (quality engineer) Chief of subcontractor Supervision organization’s (client’s) acceptance records and conclusions Date: Supervisor/ quality engineer (Client’s technical personnel of project): Date: www.ChineseStandard.net Page 96 of 99 GB 50205-2001 Interpretation for wording of this standard 1 The interpretations of some “words/phrases” indicating difference degree of “strictness” are listed as below in order to make the readers to understand these words well: 1) “must”, “have/has to”, and related antonyms (“can’t” or “it is prohibited to”) – very high degree of “strictness”; 2) “shall” and its antonyms (“shan't”) – ordinary “strictness”, i.e., in ordinary conditions, comply with the requirement(s). 3) “suitable” and “may” and related antonyms (“isn’t suitable “or “may not”– preferred where possible; 2. In the standard, “carry out (perform) according to (some requirements/standard)” and “be in conformity with (the requirement)” mean the appointed standard/requirement shall be complied with. “refer to (some standard or requirement) ” or “see (some prescription)” mean the compliance isn’t indispensable. __________ END __________ www.ChineseStandard.net Page 97 of 99 GB 50205-2001 List of Quoted Standards / Relevant Standards 1 "Code for Design of Building Foundation" GB 50007 2 "Load Code for the Design of Buildings" GB 50009 3 "Code for Design of Concrete Structures" GB 50010 4 "Code for Seismic Design of Buildings" GB 50011 5 "Code for Design of Steel Structures" GB 50017 6 "Code for Engineering Surveying" GB 50026 7 "Specifications for Bolt-shotcrete Support" GB 50086 8 "Technical Code for Waterproofing of Underground Works" GB 50108 9 "Technical Code of Slipform Engineering" GB 50113 10 "Code for Utility Technical of Concrete Admixture" GB 50119 11 "Technique of Powdered Coal Ash Concrete Spplication" GB 50146 12 "Standard for Quality Control of Concrete "GB 50164 13 "Code for Acceptance of Construction Quality of Building Foundation" GB 50202 14 "Code for Acceptance of Constructional Quality of Concrete Structures" GB 50204 15 "Code for Acceptance of Construction Quality of Steel Structures" GB 50205 16 "Technical Code of Composite Steel-form" GB 50214 17 " Standard for Classification of Seismic Protection of Building Constructions" GB 50223 18 "Code for Construction of Massive Concrete" GB 50496 19 "Technical Code for Monitoring of Building Excavation Engineering" GB 50497 20 "Safety Code for Tower Cranes" GB 5144 21 "Safety Rules for Lifting Appliances" GB 6067 22 "Safety Code for Builders Hoist" GB 10055 23 "Tower Crane" GB/T 5031 24 "Builders Hoist" GB/T 10054 25 "Concrete Pump" GB/T 13333 26 "Anchorage, Grip and Coupler for Prestressing Tendons" GB/T 14370 27 "Ready-mixed Concrete" GB/T 14902 28 "Standard for Evaluation of Concrete Compressive Strength" GB/T 50107 29 "Technical Code for Tall Building Box Foundations and Raft Foundations" JGJ 6 www.ChineseStandard.net Page 98 of 99 GB 50205-2001 30 "Specifications for Building Deformation Measurements" JGJ 8 31 " Specification for Welding and Acceptance of Reinforcing Steel Bars" JGJ 18 32 " Standard for Test Methods of Welded Joint of Steel Bars" JGJ 27 33 "Technical Specification for Safety Operation of Construction Machinery" JGJ 33 34 "Technical Code for Safety of Temporary Electrification on Construction Site" JGJ 46 35 " Standard of Construction Safety Inspection" JGJ 59 36 "Technical Specification for Safety Construction of Hydraulic Removable Formworks" JGJ 65 37 "Code for Safety of High Altitude Operation of Building Construction" JGJ 80 38 "Concrete Structures Prestressed with Unbonded Tendons" JGJ 92 39 "Technical Code for Building Pile Foundations" JGJ 94 40 "Technical Specification for Concrete Structures with Cold-rolled Ribbed Steel Wires" JGJ 95 41 "Technical Specification for Plywood Form with Steel Frame" JGJ 96 42 "Technical Specification for Steel Structure of Tall Buildings" JGJ 99 43 "Technical Code for Glass Curtain Wall Engineering" JGJ 102 44 "Specification for Winter Construction of Building Engineering" JGJ 104 45 "Technical Specification for Mechanical Splicing of Steel Reinforcing Bars" JGJ 107 46 "Technical Specification for Concrete Structures Reinforced with Welded Steel Fabric" JGJ 114 47 "Technical Specification for Retaining and Protection of Building Foundation Excavations" JGJ 120 48 "Technical Code for Safety of Frame Scaffoldings with Steel Tubules in Construction" JGJ 128 49 "Technical Code for Safety of Steel Tubular Scaffold with Couplers in Construction" JGJ 130 50 "Technical Code for Metal and Stone Curtain Walls Engineering" JGJ 133 51 "Technical Specification for Steel Reinforced Concrete Mixed Structures" JGJ 138 52 "Technical Specification for Inspection of Machinery and Equipment on Construction Site" JGJ 160 53 "Technical Code for Safety of Forms in Construction" JGJ 162 54 "Technical Code for Safety of Cuplok Steel Tubular Scaffolding in Construction" JGJ 166 55 "Technical Specification for Fair-faced Concrete Construction" JGJ 169 56 "Technical Code for Safety in Earthwork of Building Construction" JGJ 180 57 "Construction Technical Specification for Concrete Pumping" JGJ/T 10 58 "Steel Strand and Steel Wire Unbonded Tendons" JG 3006 www.ChineseStandard.net Page 99 of 99