Section Cover Sheet
Section 05505
Metal Fabrications
2006-10-31
Use this section to specify requirements for metal fabrications that will consist of galvanized
steel, stainless steel, or aluminum. Typical items include overshot gates, trash racks,
handrails, access covers, grating, ladders, stairwells, joint cover plates, embedded parts
including anchor bolts, etc.
Carefully co-ordinate this section with other sections that include similar items or items
fabricated from similar steel materials, e.g., structural shapes, plates, hollow sections, pipes,
bolts, etc.
Close attention is required to the measurement and payment articles in Section 01280Measurement Schedule for this work and other work that includes similar items, particularly in
cases where metal fabrications specified in this section are being paid by a Unit Price per
kilogram, and metal fabrications in other sections as part of a Lump Sum or by number.
Edit this section to suit the Contract requirements.
Heading of Specification Text
Part 1
General
1.1
References
1.2
Submittals
[.3]
Specification Note
Include if required.
1.3
Delivery, Storage, and Handling
Part 2
Products
2.1
Materials
Modify as required to add or delete products.
[.2.3, .2.5, .2.6, & .2.10]
Include and edit as required.
[.3.1]
Include and edit as required. Galvanized steel
ladders can also be used where appropriate.
Provide details on the Drawings.
[.3.2]
Include and edit as required. Galvanized steel
covers can also be used where appropriate,
however the cover weight should be considered.
Provide details on the Drawings.
[.4]
Add other Products as required.
CWMS Civil Works Master Specification
Alberta Transportation
Master Specification System
Page 1
Section Cover Sheet
Section 05505
Metal Fabrications
2006-10-31
Heading of Specification Text
2.2
Shop Fabrication of Steel
Components
.1
Part 3
Execution
3.1
Installation
[.6]
3.2
Specification Note
CSA-W47.1 - Certification of Companies for Fusion
Welding of Steel Structures certifies companies
under 3 divisions. The standard indicates that the
division required of companies to undertake a given
Contract is specified by the designer. Review the
CSA standard and specify the minimum division. It
may be appropriate or economical to specify
Division 1, the structural part of the work, and
Division 3 for other parts of the work.
Co-ordinate electrical grounding for metal
fabrications
near
electrical
equipment
or
instrumentation with Section [
] - Grounding.
Repair of Damaged Galvanized
Coating
END OF COVER SHEET
CWMS Civil Works Master Specification
Alberta Transportation
Master Specification System
Page 2
Tender No.: [
Section 05505
Metal Fabrications
Page 1
]
PART 1
GENERAL
1.1
REFERENCES
.1
Provide metal fabrications in accordance with the following standards (latest
revision) except where specified otherwise.
.2
American Society for Testing and Materials (ASTM)
.3
.1
ASTM A53
Specification for Pipe, Steel, Black, and
Hot-Dipped, Zinc-Coated Welded and
Seamless.
.2
ASTM A108
Specification for Steel Bars, Carbon,
Cold Finished, Standard Quality.
.3
ASTM A276
Specification for Stainless Steel Bars and
Shapes.
.4
ASTM A307
Specification for Carbon Steel Bolts and
Studs, 60,000 psi Tensile.
.5
ASTM A320
Specification for Alloys, Steel Bolting
Materials for Low-Temperature Service.
.6
ASTM A325M
Specification for High-Strength Bolts for
Structural Steel Joints (Metric).
Canadian General Standards Board (CGSB)
.1
.4
CAN/CGSB-1.181
Ready-Mixed Organic Zinc-Rich Coating.
Canadian Standards Association (CSA)
.1
CSA-G40.21
Structural Quality Steel.
.2
CAN/CSA-G164
Hot-Dip Galvanizing
Shaped Articles.
.3
CAN/CSA-S16
Limit States Design of Steel Structures.
.4
CSA-W47.1
Certification of Companies for Fusion
Welding of Steel Structures.
.5
CSA-W48
Filler Metals and Allied Materials for
Metal Arc Welding.
of
Irregularly
Tender No.: [
]
.6
1.2
Section 05505
Metal Fabrications
Page 2
CSA-W59M
Welded Steel Construction (Metal Arc
Welding) (Metric Version).
SUBMITTALS
.1
Provide the following submittals.
.2
Shop drawings at least 20 days prior to fabrication.
Indicate material
specifications, dimensions, weights, finishes, welds, and other details.
[.3]
Details of CSA welding certification of the fabricator at least 30 days prior to
fabrication.
1.3
DELIVERY, STORAGE, AND HANDLING
.1
Inspect each shipment of material and timely replace any damaged materials.
.2
Unload, handle, and store materials in accordance with the manufacturer’s
written instructions. Do not damage the metal fabrications or shop-applied
coatings. Do not store metal fabrications in direct contact with the ground.
PART 2
PRODUCTS
2.1
MATERIALS
.1
Provide materials in accordance with the following.
.2
Steel:
.1
Steel sections and plates: In accordance with CSA-G40.21, Grade 300W.
.2
Hollow structural sections: In accordance with CSA-G40.21, Grade 350W.
.3
Steel pipe: In accordance with ASTM A53, [
specified in the Contract Documents].
.4
Welding materials: In accordance with CSA-W59. Welding electrodes: In
accordance with CSA-W48.
Welding electrodes for structural steel:
E480XX.
.5
High strength steel bolts: In accordance with ASTM A325M, [galvanized
finish.]
.6
Steel anchor bolts: In accordance with ASTM A307, [galvanized finish.]
.8
Stainless steel anchor bolts: In accordance with ASTM A276 Type 304.
]
weight
[weight
as
Tender No.: [
.9
Section 05505
Metal Fabrications
Page 3
]
Stainless steel fasteners: In accordance with ASTM A320, Grade B8 Class
2 AISI 304, minimum yield strength 690 MPa, 321 HB hardness.
.10 Steel grating: Type 30–102 standard mesh galvanized grating. Size of
[serrated] bearing bars [
] [as specified in the Contract Documents].
.11 Steel studs: Nelson Studs in accordance with ASTM A108, minimum yield
strength of 345 MPa.
[.3]
Aluminium:
[.1] Ladders: [MSU Model 1105 access ladders complete with Model 3104
double rail access handles as manufactured by MSU Mississauga Ltd.]
[.2] Access hatches: [MSU Type M access hatches with padlock recess as
manufactured by MSU Mississauga Ltd.]
[.4]
2.2
[
].
SHOP FABRICATION OF STEEL COMPONENTS
.1
Employ a fabricator certified by the Canadian Welding Bureau in accordance with
CSA-W47.1, Division 3, unless specified otherwise.
.2
Fabricate in accordance with CAN/CSA-S16. Perform welding in accordance
with CSA-W59 using welding electrodes in accordance with CSA-W48. Control
and minimize distortion, and include stress relief measures to minimize residual
stresses.
.3
Do not conduct welding operations when the ambient temperature is below 0°C,
or when the base metal temperature is below 0°C. Preheat and maintain the
base metal at a minimum temperature of 25°C during welding.
.4
Accurately fabricate metal fabrications true to line and free from warps, twists,
bends, and open joints. Reject metal fabrications that have sharp kinks or
bends.
.5
Use approved dies or bending rolls for bends. When heating is required, avoid
overheating the metal and use cooling methods that do not alter the original
properties of the metal.
.6
Do not carry out metal fabrications with welds other than those specified in the
Contract Documents unless authorized by the Minister.
.7
Structural steel may be gas-cut in accordance with the applicable portions of
CAN/CSA-S16. Do not flame-cut any material without the authorization of the
Minister.
Tender No.: [
Section 05505
Metal Fabrications
Page 4
]
.8
Provide bolted connections in accordance with the applicable clauses of
CAN/CSA-S16.
.9
Provide holes for fasteners that are not more than 2 mm larger than the nominal
diameter of bolts unless otherwise specified in the Contract Documents. Where
the thickness of the material is greater than the nominal diameter of the bolt, subpunch and ream or sub-drill and ream, or drill the holes for the fasteners. Poor
matching of holes will be cause for rejection of the item of work.
.10
Hot-dip galvanize metal fabrications, except stainless steel and aluminium items
and steel items completely encased in concrete, in accordance with CAN/CSAG164. Employ measures to minimize distortions due to galvanizing. Locate vent
holes so they are not readily visible after the item is installed. Galvanize all items
after fabrication, except parts that are bolted together are to be galvanized before
final assembly. Galvanize to provide a zinc coating of not less than 610 g/m 2.
PART 3
EXECUTION
3.1
GENERAL INSTALLATION
.1
Do not tack weld to aid fabrication or installation without authorization from the
Minister
.2
Perform repairs to welds or base metal by grinding or arc-air gouging followed by
grinding. Do not use flame gouging or oxygen gouging.
.3
Shop assemble matching parts of metal fabrications to verify the correctness of
fabrication and matching of component parts. If required by the Minister,
assemble the component parts at the Site prior to installation.
.4
Accurately align and install metalwork true to the lines, grades, slopes, and
elevations specified in the Contract Documents, and obtain proper matching of
adjacent surfaces.
.5
Install anchors and anchor bolts such that, after placement of the concrete, their
position is within 3 mm of their specified location, and within 2 mm of their
specified location with respect to other anchors and anchor bolts, which are to be
subsequently connected to the same piece of metalwork. Provide templates for
proper location of anchor bolts for equipment.
[.6]
Install grounding as specified in Section [
3.2
]–[
].
REPAIR OF DAMAGED GALVANIZED COATING
.1
Repair damaged galvanized surfaces with a zinc-rich paint that is in accordance
with CAN/CGSB-1.181.
Tender No.: [
.2
]
Section 05505
Metal Fabrications
Page 5
Power tool clean surfaces to be repaired to a bright metal surface. Apply multiple
coats of zinc-rich paint in accordance with the manufacturer’s written instructions
to obtain a minimum dry film thickness of 50 microns or greater where required
by the paint manufacturer.
END OF SECTION