Tender Specifications
Metals
SECTION 05510
METAL STAIRS
PART 1 GENERAL
1.01
SECTION INCLUDES
A.
1.02
1.03
This section includes internal and external shop fabricated pre assembled steel stairs with
integral handrails and ballustrades shop primed and painted or finished as shown on the
drawings and Contract Documents including but not limited to the following:1.
Steel stair frame of structural sections, with open risers.
2.
Open grate stair treads and landings.
3.
Integral balusters and straight and curved handrailing.
4.
Glazed ballustrades.
5.
Anchors, Brackets, Accessories and Fixings.
RELATED SECTIONS
A.
Section 01300
Submittals.
B.
Section 05120
Structural Steel.
C.
Section 05520
Handrails and Railings.
D.
Section 05500
Miscellaneous Metal.
E.
Section 05050
Metal Fastenings.
F.
Section 09900
Painting.
REFERENCES
A.
American National Standards Institute:
1.
B.
ANSI A 117.1 Accessible and Usable Building and Facilities.
American Society for Testing and Materials:
1.
ASTM A 36M Carbon Structural Steel.
2.
ASTM A 53 Hot Dipped, Zinc-coated Welded and Seamless Steel Pipe.
3.
ASTM A 123 Zinc Coating (Hot Dip Galvanized) on Iron and Steel Products.
4.
ASTM A 167 Stainless steel Heat Resistant Chromium-Nickel Steel Plate Sheet and
Strip.
DIVISION 05
Metals
TENDER DOCUMENTS
Specifications
C.
5.
ASTM A 269 Seamless and Welded Austenitic Stainless Steel Tubing.
6.
ASTM A 283 Carbon Steel Plates, Shapes and Bars.
7.
ASTM A 312 M Seamless and Welded Austenitic Stainless Steel Pipe.
8.
ASTM A 480 M General Requirements for Flat Rolled Stainless Steel Plate Sheet
and Strip.
9.
ASTM A 484 M General Requirements for Flat Rolled Stainless Steel Sheet, Strip,
Billets and Forgings.
10.
ASTM A 500 Steel Tubing.
11.
ASTM A 501 Hot Formed Welded & Seamless Carbon Steel Structural Tubing.
12.
ASTM A 513 Type 5 Steel Tubing.
13.
ASTM A 536 M General Requirement for Steel Carbon and High Strength Low
Alloy Hot Rolled Steel Sheets and Cold Rolled Sheets.
14.
ASTM A 569 Steel Sheet.
15.
ASTM A 570 Steel Sheet Type E, Grade A Standard Weight Black Finish.
16.
ASTM A 611 Steel Cold Rolled Sheets, Carbon, Structures.
17.
ASTM A 666 Austenitic Stainless Steel Sheet Strip Plate and Flat Bar.
18.
ASTM B 177 Chromium Electroplating on Steel for Engineering Use.
19.
ASTM E 935 Test Methods for Performance of Permanent Metal Railing Systems
and Rails for Buildings.
20.
ASTM E 985 Permanent Metal Railing Systems and Rails for Buildings.
21.
ASTM F 593 Stainless Steel Bolts, Hex Cap Screws and Studs.
22.
ASTM F 594 Stainless Steel Nuts.
American Institute of Steel Construction:
1.
D.
AISC S 326 Design Fabrication and Erection of Structural Steel for Building.
American Welding Society:
1.
AWS D1.1 Structural Welding Code – Steel.
2.
AWS A 2.4 Standard Symbols for Welding, Brazing, and Nondestructive
Examination.
DIVISION 05
Metals
TENDER DOCUMENTS
Specifications
E.
F.
1.04
1.05
1.06
1.07
National Association of Architectural Metal Manufacturers (NAAMM):
1.
NAAMM AMP 510 Metal Stairs Manual.
2.
NAAMM MBG 531 Metal Bar Grating Manual.
The Society of Protective Coating (SSPC):
1.
SSPC Steel Structures Painting Manual.
2.
SSPC SP1 Solvent Cleaning.
3.
SSPC SP 10 Near – White Blast Cleaning.
4.
SSPC Paint 20 Zinc – Rich Primers (Type I – Inorganic and Type II – Organic).
DESIGN REQUIREMENTS
A.
Fabricate stair assembly to support a uniform live load of 2.4 KN/m² with deflection of
stringer or landing framing not to exceed 1/240 of span.
B.
Railing assembly, wall rails, and attachments to resist lateral force of 0.5 KN at any point
without damage or permanent set.
SUBMITTALS
A.
Comply with Section 01300.
B.
Shop Drawings: Indicate profiles, sizes, connection attachments, reinforcing, anchorage,
size and type of fasteners, and accessories.
C.
Shop Drawings: Indicate welded connections using AWS A 2.0 welding symbols. Indicate
net weld lengths.
D.
Samples: Submit one sample showing typical radius of painted galvanized steel.
E.
Design Data: Submit design calculations.
QUALITY ASSURANCE
A.
Perform work in accordance with ASTM E 985.
B.
Welder’s Certificates: Submit under provisions of Section 01300, certifying welders
employed on the work. Verifying AWS qualification within previous 12 months.
FIELD MEASUREMENTS.
A.
Verify field measurements prior to fabrication.
DIVISION 05
Metals
TENDER DOCUMENTS
Specifications
PART 2 PRODUCTS
2.01
PRODUCTS
A.
Handrail Wall Brackets: Unless otherwise indicated, malleable iron, 65 mm diameter wall
plate; center of rail 75 mm from face of wall.
B.
Stair Nosing for Steel Pan Stairs with Concrete Filled Stairs - 2 Piece: Sub-channel for
installation during concrete placement and abrasive tread plate for installation in final stages
of construction.
1.
Factory install temporary protective board in sub-channel for protection during
construction. Seal ends of sub-channel using heavy duty tape to eliminate concrete
infiltration and staining. Construct sub-channels and abrasive carrying plates of
extruded aluminum with mill finish.
2.
Include concealed concrete anchors and tread plate securing screws. Protect
embedded items with heavy coating of factory applied clear lacquer.
3.
Acceptable manufacturer’s and products or equal and approved:
a.
C.
Gate Spring Pivot Hinge: Surface mounted, malleable iron, with anti-friction bearing,
allowing spring tension adjustment after installation.
1.
2.02
Balco Inc.: Balco Two Component Stair Nosing, No. XH 330.
Acceptable manufacturers and products, or equal and approved:
a.
McKinney Manufacturing Co.
b.
Bommer Industries, Inc.
STEEL RAILING SYSTEM
A.
Steel Sections and Tubing: All materials in hot rolled steel plates and sections shall be in
accordance with ASTM A 501 and shall be grade A unless otherwise indicated on the
Drawings.
B.
Stainless Steel: Materials shall be as ASTM 480 M, ASTM A 167 and ASTM A 276 type
A2/304/306.
C.
Steel Plates: ASTM A 283, type 302 or 304.
D.
Steel Pipe: ASTM A 53, Grade B Schedule 40.
E.
Rails and Posts: 50 mm diameter steel tubing pipe; welded joints.
F.
Posts: 50 mm diameter steel tubing pipe; welded joints.
G.
Fittings: Elbows, T-shapes, wall brackets, escutcheons; cast machined steel.
H.
Mounting: Adjustable brackets and flanges, for bolting to concrete and masonry.
TENDER DOCUMENTS
Specifications
2.03
2.04
DIVISION 05
Metals
I.
Exposed Fasteners: Flush countersunk screws or bolts; consistent with design of railing.
J.
Splice Connectors: Steel welding collars.
K.
Galvanizing: To ASTM A 123, provide minimum 600 g/sq m galvanized coating.
L.
Stainless Steel: To ASTM A 480; Type 304/306.
M.
Handrail: 50 mm diameter polished stainless steel.
N.
Fixings: To manufacturer's detail, polished stainless steel or brass covering where exposed.
WELDING MATERIALS:
A.
Metal arc welding of steel shall comply with AWS D1.1, D1.2 and D1.3. Electrodes for
manual metal arc welding shall comply with AWS D1.1. Automatic welding processes shall
deposit weld metal complying with AWS D1.1.
B.
Tungsten arc welding of aluminum shall be in accordance with AWS D1.3. All materials
used in welding or brazing shall be compatible with the parent alloys which are being joined.
The corrosion resistant properties and strength of the alloys shall not be unduly impaired by
the process of welding and care shall be taken to avoid high residual welding stresses.
C.
Electrodes used shall give a weld deposit having mechanical properties not less than the
minimum specified for the parent metal. All electrodes shall be used strictly in accordance
with the manufacturer's recommendations.
D.
The storage of the consumable materials shall comply with the recommendations of the
respective manufacturer and shall be in accordance with the best modern practice.
E.
The Contractor's attention is drawn to the necessity for keeping basic electrodes dry. On site,
the electrodes should be kept in heated portable quivers and only used when still warm.
F.
The storage of wire for automatic and semi-automatic welding processes shall be such as to
avoid the formation of deleterious materials on the wire.
G.
The Engineer shall have the right to inspect and approve the storage arrangements and may
reject any materials which have been damaged or are considered unsuitable for any reason.
FABRICATION - GENERAL
A.
Fit and shop assemble components in largest practical sections, for delivery to site.
B.
Fabricate components with joints tightly fitted and secured. Provide spigots and sleeves to
accommodate site assembly and installation.
C.
Continuously seal joined pieces by continuous welds.
D.
Provide anchors, plates angles required for connecting railings to structure.
E.
Exposed Mechanical Fastenings: Flush countersunk screws or bolts; unobtrusively located;
consistent with design of component, except where specifically noted otherwise.
DIVISION 05
Metals
TENDER DOCUMENTS
Specifications
2.05
F.
Supply components required for anchorage of fabrications. Fabricate anchors and related
components of same material and finish as fabrication, except where specifically noted
otherwise.
G.
Exterior Components: Continuously seal joined pieces by intermittent welds and plastic
filler. Continuous welds. Drill condensate drainage holes at bottom of members at locations
that will not encourage water intrusion.
H.
Interior Components: Continuously seal joined pieces by intermittent welds and plastic
filler. Continuous welds.
I.
Grind exposed joints flush and smooth with adjacent finish surface. Make exposed joints
butt tight, flush, and hairline. Ease exposed edges to small uniform radius.
J.
Accurately form components to suit stairs and landings, to each other and to building
structure.
K.
Accommodate for expansion and contraction of members and building movement without
damage to connections or members.
L.
Use factory formed bends and elbows free from necking and distortions.
FABRICATION - STAIRS AND LANDINGS
A.
Design and fabricate steel stairs to comply with recommendations of NAAMM Metal Stair
Manual.
B.
Form treads with minimum 6 mm thick open grate; prime paint galvanized finish. Bolt to
stringer support clips.
C.
Use member sizes as defined by manufacturer in accordance with the design criteria laid out
in this specification.
D.
Steel Stair Fabrication: Fabricate to dimension requirements and configuration indicated.
1.
NAAMM classification: Commercial Class.
2.
Design loading:
a.
b.
c.
3.
Design and fabricate stairs, landings, and component connections to support
2
live loads of not less than 488kg/m creating a deflection not to exceed
1/360 of span.
Design and fabricate treads to support a concentrated load of 1465kg/m2 on
a 100 mm square area centered on tread length.
Design and fabricate integral railings and component connections to be
capable of resisting a load of 976kg/m2 concentrated load applied in any
direction at any point on the top rail and a vertical and horizontal thrust of
75kg/m applied to the top railing without permanent set or damage. The two
loads are not cumulative.
Stringers: Profile and sizing by fabricator using either channel or steel plate unless
otherwise indicated.
DIVISION 05
Metals
TENDER DOCUMENTS
Specifications
4.
Treads and risers:
a.
b.
c.
d.
E.
Metal thickness: Not less than 1.5 mm.
Treads: Bent steel subtreads to receive concrete fill where shown on
drawings.
Risers: Complete with formed nosings and sanitary cove. Delete sanitary
cove when resilient treads and risers will be installed.
Design similar to NAAMM Stair Manual, Figure No. 6.
Railings and Handrails: Fabricate railings as shown from 32 mm schedule 40 pipe (outside
diameter 42 mm) and 13 mm square steel pickers.
PART 3 EXECUTION
3.01
EXAMINATION
A.
3.02
3.03
Verify that field conditions are acceptable and are ready to receive work.
PREPARATION
A.
Clean and strip primed steel items to bare metal where site welding is required.
B.
Supply items required to be cast into concrete and embedded in masonry with setting
templates.
INSTALLATION
A.
Install components plumb and level, accurately fitted, free from distortion or defects.
B.
Provide anchors, plates, angles, hangers and struts required for connecting stairs to structure.
C.
Allow for erection loads, and for sufficient temporary bracing to maintain true alignment
until completion of erection and installation of permanent attachments.
D.
Field weld components indicated on shop drawings.
E.
Field bolt and weld to match shop bolting and welding. Conceal bolts and screws whenever
possible. Where not concealed, use flush countersunk fastenings.
F.
Mechanically fasten joints butted tight, flush, and hairline. Grind welds smooth and flush.
G.
Obtain approval prior to site cutting or creating adjustments not scheduled.
H.
After erection, prime welds, abrasions, and surfaces not shop primed, except surfaces to be
in contact with concrete.
I.
Install reinforcing mesh in tread and landing pans that are to receive concrete fill. Position
and securely fasten mesh midway in depth of concrete. Size mesh to cover entire are of tread
or landing.
J.
Perform cutting and altering to provide for installation of Work of other Sections that does
not affect stair appearance or structural integrity.
TENDER DOCUMENTS
Specifications
1.
K.
3.04
DIVISION 05
Metals
Do not perform cutting and altering that will affect appearance or structural
integrity without Engineer’s review.
Assemble with spigots and sleeves to make tight joints and secure installation.
ERECTION TOLERANCES
A.
Maximum Variation From Plumb: 6 mm per storey, non-
cumulative. B. Maximum Offset From True Alignment: 6 mm.
3.05
CLEANING
A.
Comply with Section 01700.
B.
Clean materials as recommended by manufacturer.
END OF SECTION 05510