OSUT_1_05_51_00_Metal_Stairs.pdf

OUST-AR RANGE PROJECTS FY19

SECTION 05 51 00

METAL STAIRS

05/09

PART 1 GENERAL

1.1 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

AMERICAN ASSOCIATION OF STATE HIGHWAY AND TRANSPORTATION OFFICIALS

(AASHTO)

AASHTO M 314 (1990; R 2008) Standard Specification for Steel Anchor Bolts

AMERICAN INSTITUTE OF STEEL CONSTRUCTION (AISC)

AISC 360 (2005) Specification for Structural Steel Buildings, with Commentary

AMERICAN IRON AND STEEL INSTITUTE (AISI)

AISC/AISI 121 (2004) Standard Definitions for Use in the Design of Steel Structures

AMERICAN WELDING SOCIETY (AWS)

AWS D1.1/D1.1M (2008; Errata 2009) Structural Welding Code - Steel

ASME INTERNATIONAL (ASME)

ASME B18.2.1 (1996; Addenda A 1999; Errata 2003; R 2005) Square and Hex Bolts and Screws (Inch Series)

ASME B18.2.3.8M (1981; R 2005) Metric Hex Lag Screws

ASME B18.22.1 (1965; R 2008) Plain Washers

ASME B18.22M (1981; R 2005) Metric Plain Washers

ASME B18.6.1 (1981; R 2008) Wood Screws (Inch Series)

ASME B18.6.3 (2003; R 2008) Machine Screws and Machine Screw Nuts

ASME B18.6.5M (2000; R 2005) Standard Specification for Metric Thread-Forming and Thread-Cutting

Tapping Screws

ASME B18.6.7M (1999; R 2005) Metric Machine Screws

ASTM INTERNATIONAL (ASTM)

ASTM A 1008/A 1008M (2009a) Standard Specification for Steel, Sheet, Cold-Rolled, Carbon, Structural, High-Strength Low-Alloy and High-Strength Low-Alloy with Improved Formability, Solution Hardened, and Bake Hardened

ASTM A 1011/A 1011M (2009b) Standard Specification for Steel, Sheet, and Strip, Hot-Rolled, Carbon, Structural, High-Strength Low-Alloy and High-Strength Low-Alloy with Improved Formability

ASTM A 108 (2007) Standard Specification for Steel Bar, Carbon and Alloy, Cold-Finished

ASTM A 123/A 123M (2009) Standard Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products

ASTM A 153/A 153M (2009) Standard Specification for Zinc Coating (Hot-Dip) on Iron and Steel Hardware

ASTM A 27/A 27M (2008) Standard Specification for Steel Castings, Carbon, for General Application

ASTM A 283/A 283M (2003; R 2007) Standard Specification for Low and Intermediate Tensile Strength Carbon Steel Plates

ASTM A 29/A 29M (2005) Standard Specification for Steel Bars, Carbon and Alloy, Hot-Wrought General Requirements for

ASTM A 307 (2007b) Standard Specification for Carbon Steel Bolts and Studs, 60 000 PSI Tensile Strength

ASTM A 325 (2009) Standard Specification for Structural Bolts, Steel, Heat Treated, 120/105 ksi Minimum Tensile Strength

ASTM A 325M (2009a) Standard Specification for Structural Bolts, Steel, Heat Treated, 830 Mpa Minimum Tensile Strength (Metric)

ASTM A 36/A 36M (2008) Standard Specification for Carbon Structural Steel

ASTM A 449 (2007b) Specification for Hex Cap Screws, Bolts, and Studs, Steel, Heat Treated, 120/105/90 ksi Minimum Tensile Strength, General Use

ASTM A 47/A 47M (1999; R 2009) Standard Specification for Steel Sheet, Aluminum-Coated, by the Hot-Dip Process

ASTM A 48/A 48M (2003; R 2008) Standard Specification for Gray Iron Castings

ASTM A 500/A 500M (2009) Standard Specification for Cold-Formed Welded and Seamless Carbon Steel Structural Tubing in Rounds and Shapes

ASTM A 512 (2006) Standard Specification for Cold-Drawn Buttweld Carbon Steel Mechanical Tubing

ASTM A 526/A 526M (1990) Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) by the Hot-Dip Process, Commercial Quality

ASTM A 53/A 53M (2007) Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless

ASTM A 568/A 568M (2009a) Standard Specifications for Steel, Sheet, Carbon, and High-Strength, Low-Alloy, Hot-Rolled and Cold-Rolled, General Requirements for

ASTM A 575 (1996; R 2007) Standard Specification for Steel Bars, Carbon, Merchant Quality, M-Grades

ASTM A 6/A 6M (2009) Standard Specification for General Requirements for Rolled Structural Steel Bars, Plates, Shapes, and Sheet Piling

ASTM A 653/A 653M (2009a) Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by the Hot-Dip Process

ASTM A 924/A 924M (2009a) Standard Specification for General Requirements for Steel Sheet, Metallic-Coated by the Hot-Dip Process

ASTM B 209 (2007) Standard Specification for Aluminum and Aluminum-Alloy Sheet and Plate

ASTM B 209M (2007) Standard Specification for Aluminum and Aluminum-Alloy Sheet and Plate (Metric)

ASTM C 514 (2004e1; R 2009) Standard Specification for Nails for the Application of Gypsum

Board

ASTM C 636/C 636M (2008) Standard Practice for Installation of Metal Ceiling Suspension Systems for Acoustical Tile and Lay-In Panels

ASTM E 488 (1996; R 2003) Standard Test Methods for Strength of Anchors in Concrete and Masonry Elements

ASTM F 1679 (2004e1) Standard Test Method for Using a Variable Incidence Tribometer

ASTM F 568M (2007) Standard Specification for Carbon and Alloy Steel Externally Threaded Metric Fasteners

NATIONAL ASSOCIATION OF ARCHITECTURAL METAL MANUFACTURERS (NAAMM)

NAAMM MBG 531 (2000) Metal Bar Grating Manual

NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)

NFPA 101 (2009; Amd 1 & 2 2009) Life Safety Code

THE SOCIETY FOR PROTECTIVE COATINGS (SSPC)

SSPC Paint 25 (1997; E 2004) Paint Specification No. 25 Zinc Oxide, Alkyd, Linseed Oil Primer for Use Over Hand Cleaned Steel Type I and Type II

1.2 SUBMITTALS

Government approval is required for submittals with a "G" designation;

submittals not having a "G" designation are for information only. When used, a designation following the "G" designation identifies the office that will review the submittal for the Government. Submit the following in accordance with Section 01 33 00 SUBMITTAL PROCEDURES:

SD-02 Shop Drawings

Submit fabrication drawings for the following items in accordance with the paragraph entitled, "General Requirements," of this section.

Iron and Steel Hardware

Steel Shapes, Plates, Bars and Strips

Metal Stair System

SD-03 Product Data

Submit manufacturer's catalog data including two copies of manufacturers specifications, load tables, dimension diagrams, and anchor details for the following items:

Structural Steel Plates, Shapes, and Bars

Structural Steel Tubing

Hot-Rolled Carbon Steel Sheets and Strips

Cold Finished Steel Bars

Hot-Rolled Carbon Steel Bars

Cold-Rolled Carbon Steel Sheets

Galvanized Carbon Steel Sheets

Cold-Drawn Steel Tubing

Protective Coating

Steel Pan Stairs

Steel Stairs

SD-07 Certificates

Submit Welding Procedures in accordance with AWS D1.1/D1.1M.

Submit certificates for Welder Qualification in accordance with the paragraph entitled, "Qualifications for Welding Work," of this section.

SD-08 Manufacturer's Instructions

Submit manufacturer's installation instructions for the following products used in the fabrication of steel stair work.

Structural Steel Plates, Shapes, and Bars

Structural Steel Tubing

Hot-Rolled Carbon Steel Sheets and Strips

Cold Finished Steel Bars

Hot-Rolled Carbon Steel Bars

Cold-Rolled Carbon Steel Sheets

Galvanized Carbon Steel Sheets

Cold-Drawn Steel Tubing

Protective Coating

1.3 QUALIFICATIONS FOR WELDING WORK

Section 05 05 23 WELDING, STRUCTURAL applies to work specified in this section.

PART 2 PRODUCTS

2.1 GENERAL REQUIREMENTS

Submit complete and detailed fabrication drawings for all Iron and Steel Hardware, and for all Steel Shapes, Plates, Bars and Strips used in accordance with the design specifications referenced in this section.

Pre-assemble items in the shop to the greatest extent possible.

Disassemble units only to the extent necessary for shipping and handling.

Clearly mark units for reassembly and coordinated installation.

For the fabrication of work exposed to view, use only materials that are smooth and free of surface blemishes, including pitting, seam marks, roller marks, rolled trade names, and roughness. Remove blemishes by grinding, or by welding and grinding, prior to cleaning, treating, and application of surface finishes, including zinc coatings.

2.2 STRUCTURAL STEEL PLATES, SHAPES AND BARS

Structural-size shapes and plates, conforming to ASTM A 36/A 36M, unless otherwise noted, except bent or cold-formed plates.

Steel plates - bent or cold-formed, conforming to ASTM A 283/A 283M, Grade C.

Steel bars and bar-size shapes, conforming to ASTM A 36/A 36M, unless otherwise noted for steel bars and bar-size shapes.

2.3 STRUCTURAL STEEL TUBING

Structural steel tubing, hot-formed, welded or seamless, conforming to ASTM A 500/A 500M, Grade B, unless otherwise noted.

2.4 HOT-ROLLED CARBON STEEL BARS

Hot-rolled carbon steel bars and bar-size shapes, conforming to ASTM A 575, grade as selected by the fabricator.

2.5 COLD-FINISHED STEEL BARS

Cold-finished steel bars conforming to ASTM A 108, grade as selected by the fabricator.

2.6 HOT-ROLLED CARBON STEEL SHEETS AND STRIPS

Hot-rolled carbon sheets and strips conforming to ASTM A 568/A 568M and ASTM A 1011/A 1011M, pickled and oiled.

2.7 COLD-ROLLED CARBON STEEL SHEETS

Cold-rolled carbon steel sheets conforming to ASTM A 1008/A 1008M.

2.8 GALVANIZED CARBON STEEL SHEETS

Galvanized carbon steel sheets conforming to ASTM A 526/A 526M, with galvanizing conforming to ASTM A 653/A 653M and ASTM A 924/A 924M.

2.9 COLD-DRAWN STEEL TUBING

Cold drawn steel tubing conforming to ASTM A 512, sunk drawn, butt-welded, cold-finished, and stress-relieved.

2.12 STEEL PIPE

Steel pipe conforming to ASTM A 53/A 53M, type as selected, Grade B; primed finish, unless galvanizing is required; standard weight (Schedule 40).

2.15 FASTENERS

Galvanized zinc-coated fasteners in accordance with ASTM A 153/A 153M and used for exterior applications or where built into exterior walls or floor systems. Select fasteners for the type, grade, and class required for the installation of steel stair items.

Standard/regular hexagon-head bolts and nuts be conforming to ASTM A 307, Grade A.

Square-head lag bolts conforming to ASME B18.2.1.

Machine screws cadmium-plated steel conforming to ASME B18.6.3.

Wood screws, flat-head carbon steel conforming to ASME B18.6.1.

Plain washers, round, general-assembly-grade, carbon steel conforming to

ASME B18.22.1.

Lockwashers helical spring, carbon steel conforming to.

2.16 GENERAL FABRICATION

Prepare and submit metal stair system shop drawings with detailed plans and elevations at not less than 1 inch to 1 foot with details of sections and connections at not less than 3 inches to 1 foot. Also detail placement drawings, diagrams, templates for installation of anchorage, including but not limited to, concrete inserts, anchor bolts, and miscellaneous metal items having integral anchorage devices.

Use materials of size and thicknesses indicated or, if not indicated, of required size and thickness to produce adequate strength and durability in finished product for intended use. Work materials to dimensions indicated on approved detail drawings, using proven details of fabrication and support. Use type of materials indicated or specified for the various components of work.

Form exposed work true to line and level with accurate angles and surfaces and straight sharp edges. Ease exposed edges to a radius of approximately 1/32 inch, and bend metal corners to the smallest radius possible without causing grain separation or otherwise impairing the work.

Continuously weld corners and seams in accordance with the recommendations of AWS D1.1/D1.1M. Grind smooth exposed welds and flush to match and blend with adjoining surfaces.

Form exposed connections with hairline joints that are flush and smooth, using concealed fasteners wherever possible. Use exposed fasteners of the type indicated or, if not indicated, use Phillips flathead (countersunk) screws or bolts.

Provide and coordinate anchorage of the type indicated with the supporting structure. Fabricate anchoring devices, space as indicated and required to provide adequate support for the intended use of the work.

Use hot-rolled steel bars for work fabricated from bar stock unless work is indicated or specified as fabricated from cold-finished or cold-rolled stock.

2.17 PROTECTIVE COATING

Shop prime steelwork with red oxide primer in accordance with SSPC Paint 25

2.18 STEEL PAN STAIRS

2.18.1 General

Use welding for joining pieces together. Fabricate units so that bolts and other fastenings do not appear on finish surfaces. Make joints true and tight, and connections between parts lightproof tight. Grid smooth continuous welds where exposed.

Construct metal stair units to sizes and arrangements indicated to support a minimum live load of 100 pounds per square foot. Provide framing, hangers, columns, struts, clips, brackets, bearing plates, and other components as required for the support of stairs and platforms.

2.18.2 Stair Framing

Fabricate stringers of structural steel channels, or plates, or a combination thereof as indicated. Provide closures for exposed ends of strings.

Construct platforms of structural steel channel headers and miscellaneous framing members as indicated. Bolt headers to stringers and newels and framing members to stringers and headers.

2.18.3 Riser, Subtread, And Subplatform Metal Pans

Form metal pans of 0.1084-inch (12-gage) thick structural steel sheets, conforming to ASTM A 1011/A 1011M, Grade 36. Shape pans to configuration indicated.

Construct riser and subtread metal pans with steel angle supporting brackets, of size indicated, welded to stringers. Secure metal pans to brackets with rivets or welds. Secure subplatform metal pans to platform frames with welds.

2.18.4 Metal Safety Nosings

Cast metal abrasive safety nosings, nonskid type, 4 inches wide by full length of step between stringers. Fabricate to thickness, profile, and surface pattern as indicated. Equip each nosing with integral anchors for embedding in pan fill material, and spaced not more than 4 inches from each end and not more than 15 incheson center.

2.18.9 Steel Stairs

Provide steel stairs complete with stringers, steel-plate treads and risers, metal-pan concrete-filled treads, landings, columns, handrails, and necessary bolts and other fastenings. Shop paint steel stairs and accessories.

2.18.9.2 Materials

Provide steel stairs of welded construction except that bolts may be used where welding is not practicable. Screw or screw-type connections are not permitted.

a. Structural Steel: ASTM A 36/A 36M.

b. Support metal pan for concrete fill on angle cleats welded to stringers or treads with integral cleats, welded or bolted to the stringer.

Provide sheet-steel landings with angle stiffeners welded on. Close exposed ends.

c. Before fabrication, obtain necessary field measurements and verify drawing dimensions.

d. Clean metal surfaces free from mill scale, flake rust and rust pitting prior to shop finishing. Weld permanent connections. Finish welds flush and smooth on surfaces that will be exposed after installation.

PART 3 EXECUTION

3.1 STEEL STAIRS

Provide anchor bolts, grating fasteners, washers, and all parts or devices necessary for proper installation. Provide lock washers under nuts.

3.2 INSTALLATION OF SAFETY NOSINGS

Completely embed nosing in concrete before the initial set of the concrete occurs and finish flush with the top of the concrete surface.

3.3 FIELD WELDING

Execute procedures of manual shielded metal arc welding, appearance and quality of welds made, and methods used in correcting welding work in compliance with AWS D1.1/D1.1M.

3.4 TOUCHUP PAINTING

Immediately after installation, clean all field welds, bolted connections, and abraded areas of the shop painted material, and repaint exposed areas with the same paint used for shop painting. Apply paint by brush or spray to provide a minimum dry-film thickness of 2 mils.

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