HomeMy WebLinkAbout05 51 00 Pre-Engineered Steel Stair System.docPEDCOR SQUARE; BUILDING 5
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PRE-ENGINEERED
PEDCOR SQUARE Issue Date 12.18.15 STEEL STAIR SYSTEMS
PEDCOR SQUARE; BUILDING 5
SECTION 05 51 00 – PRE-ENGINEERED STEEL STAIR SYSTEMS
PART 1 - GENERAL
1.1 RELATED DOCUMENTS
A. Drawings and general provisions of the Contract, including General and Supplementary
Conditions and Division 01 Specification Sections, apply to this Section.
1.2 SUMMARY
A. This Section includes the following:
1. Preassembled steel stairs with concrete-filled treads.
2. Steel tube handrails attached to walls adjacent to metal stairs.
B. Related Sections include the following:
1. Division 03 Section "Cast-in-Place Concrete" for concrete fill for stair treads and
platforms.
2. Division 05 Section “Pipe and Tube Railings” for pipe and tube railings not attached to
metal stairs or to walls adjacent to metal stairs.
3. Division 09 Section “Painting” for steel stair painting.
1.3 PERFORMANCE REQUIREMENTS
A. Structural Performance of Stairs: Provide metal stairs capable of withstanding the effects of
gravity loads and the following loads and stresses within limits and under conditions indicated:
1. Uniform Load: 100 lbf/sq. ft.
2. Concentrated Load: 300 lbf applied on an area of 4 sq. in.
3. Uniform and concentrated loads need not be assumed to act concurrently.
4. Stair Framing: Capable of withstanding stresses resulting from railing loads in addition to
loads specified above.
5. Limit deflection of treads, platforms, and framing members to L/360 or 1/4 inch,
whichever is less.
B. Structural Performance of Railings: Provide railings capable of withstanding the effects of
gravity loads and the following loads and stresses within limits and under conditions indicated:
1. Handrails:
a. Uniform load of 50 lbf/ ft. applied in any direction.
b. Concentrated load of 200 lbf applied in any direction.
c. Uniform and concentrated loads need not be assumed to act concurrently.
2. Top Rails of Guards:
a. Uniform load of 50 lbf/ ft. applied horizontally and concurrently with 100 lbf/ ft.
applied vertically downward.
b. Concentrated load of 200 lbf applied in any direction.
c. Uniform and concentrated loads need not be assumed to act concurrently.
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3. Infill of Guards:
a. Concentrated load of 50 lbf applied horizontally on an area of 1 sq. ft.
b. Infill load and other loads need not be assumed to act concurrently.
C. Seismic Performance: Provide metal stairs capable of withstanding the effects of earthquake
motions determined according to ASCE 7.
1. Component Importance Factor is 1.5.
1.4 SUBMITTALS
A. Product Data: For metal stairs and the following:
1. Pre-filled metal-pan stair treads.
2. Paint products.
3. Grout.
B. Shop Drawings: Include plans, elevations, sections, details, and attachments to other work.
1. Provide templates for anchors and bolts specified for installation under other Sections.
2. For installed products indicated to comply with design loads, include structural analysis
data signed and sealed by the qualified professional engineer responsible for their
preparation.
C. Samples for Initial Selection: For products involving selection of color, texture, or design.
D. Welding certificates.
E. Qualification Data: For professional engineer.
1.5 QUALITY ASSURANCE
A. Delegated Design: Design metal stairs, including comprehensive engineering analysis by a
qualified professional engineer, sing performance requirements and design criteria indicated.
B. Installer Qualifications: Fabricator of products to have 10 years of experience in the design,
engineering, and fabrication of steel stairs.
1. Refer also to Specification Section 01 40 00 “Quality Requirements” 1.3 H and I.
C. NAAMM Stair Standard: Comply with "Recommended Voluntary Minimum Standards for Fixed
Metal Stairs" in NAAMM AMP 510, "Metal Stairs Manual," for class of stair designated, unless
more stringent requirements are indicated.
1. Preassembled Stairs: Commercial class.
D. Welding: Qualify procedures and personnel according to the following:
1. AWS D1.1, "Structural Welding Code--Steel."
2. AWS D1.3, "Structural Welding Code--Sheet Steel."
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1.6 COORDINATION
A. Coordinate installation of anchorages for metal stairs. Furnish setting drawings, templates, and
directions for installing anchorages, including sleeves, concrete inserts, anchor bolts, and items
with integral anchors, that are to be embedded in concrete or masonry. Deliver such items to
Project site in time for installation.
B. Coordinate locations of hanger rods and struts with other work so that they will not encroach on
required stair width and will be within the fire-resistance-rated stair enclosure.
PART 2 - PRODUCTS
2.1 MANUFACTURERS
A. In other Part 2 articles where titles below introduce lists, the following requirements apply to
product selection:
1. Manufacturers: Subject to compliance with requirements, provide products by the
manufacturer specified.
2.2 METALS, GENERAL
A. Metal Surfaces, General: Provide materials with smooth, flat surfaces, unless otherwise
indicated. For components exposed to view in the completed Work, provide materials without
seam marks, roller marks, rolled trade names, or blemishes.
2.3 FERROUS METALS
A. Steel Plates, Shapes, and Bars: ASTM A 36.
B. Steel Tubing: ASTM A 500 (cold formed).
C. Steel pipe ASTM A 53, Type E or S, Grade B.
D. Uncoated, Hot-Rolled Steel Sheet: ASTM A 1011, either commercial steel, Type B, or structural
steel, Grade 30, unless another grade is required by design loads.
E. Steel Sheet:
1. Structural use: ASTM A 570 (hot rolled) or A 36 (cold rolled).
2. Non-structural use: ASTM A 569 (hot rolled) or A 36 (cold rolled).
2.4 FASTENERS
A. General: Provide zinc-plated fasteners with coating complying with ASTM B 633,
Class Fe/Zn 25 for exterior use, and Class Fe/Zn 5 where built into exterior walls. Select
fasteners for type, grade, and class required.
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B. Bolts and Nuts: Regular hexagon-head bolts, ASTM A 307, Grade A; with hex nuts,
ASTM A 563; and, where indicated, flat washers.
C. Anchor Bolts: ASTM F 1554, Grade 36.
D. Machine Screws: ASME B18.6.3.
E. Lag Bolts: ASME B18.2.1.
F. Plain Washers: Round, ASME B18.22.1.
G. Lock Washers: Helical, spring type, ASME B18.21.1.
H. Expansion Anchors: Anchor bolt and sleeve assembly with capability to sustain, without failure,
a load equal to six times the load imposed when installed in unit masonry and four times the
load imposed when installed in concrete, as determined by testing according to ASTM E 488,
conducted by a qualified independent testing agency.
1. Material for Anchors in Interior Locations: Carbon-steel components zinc-plated to
comply with ASTM B 633, Class Fe/Zn 5.
2. Material for Anchors in Exterior Locations: Alloy Group 1 stainless-steel bolts complying
with ASTM F 593 and nuts complying with ASTM F 594.
2.5 MISCELLANEOUS MATERIALS
A. Welding Rods and Bare Electrodes: Select according to AWS specifications for metal alloy
welded.
B. Primers: Provide acrylic latex rust inhibitive primers that comply with Division 09 Section
"Painting."
C. Bituminous Paint: Cold-applied asphalt emulsion complying with ASTM D 1187.
D. Non-shrink, Nonmetallic Grout: Factory-packaged, non-staining, non-corrosive, nongaseous
grout complying with ASTM C 1107. Provide grout specifically recommended by manufacturer
for interior and exterior applications.
E. Concrete Materials and Properties: Comply with requirements in Division 03 Section "Cast-in-
Place Concrete."
F. Welded Wire Fabric: ASTM A 185, 6 by 6 inches-W1.4 by W1.4, unless otherwise indicated.
2.6 FABRICATION, GENERAL
A. Provide complete stair assemblies, including metal framing, hangers, struts, railings, clips,
brackets, bearing plates, and other components necessary to support and anchor stairs and
platforms on supporting structure.
1. Join components by welding, unless otherwise indicated.
2. Use connections that maintain structural value of joined pieces.
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3. Fabricate treads and platforms of exterior stairs so finished walking surfaces slope to
drain.
B. Preassembled Stairs: Assemble stairs in shop to greatest extent possible. Disassemble units
only as necessary for shipping and handling limitations. Clearly mark units for reassembly and
coordinated installation.
C. Cut, drill, and punch metals cleanly and accurately. Remove burrs and ease edges to a radius
of approximately 1/32 inch, unless otherwise indicated. Remove sharp or rough areas on
exposed surfaces.
D. Form bent-metal corners to smallest radius possible without causing grain separation or
otherwise impairing work.
E. Form exposed work true to line and level with accurate angles and surfaces and straight edges.
F. Weld connections to comply with the following:
1. Use materials and methods that minimize distortion and develop strength and corrosion
resistance of base metals.
2. Obtain fusion without undercut or overlap.
3. Remove welding flux immediately.
4. Weld exposed corners and seams continuously, unless otherwise indicated.
5. At exposed connections, finish exposed welds and surfaces smooth and blended so no
roughness shows after finishing and contour of welded surface matches that of adjacent
surface.
G. Form exposed connections with hairline joints, flush and smooth, using concealed fasteners
where possible. Where exposed fasteners are required, use Phillips flat-head (countersunk)
screws or bolts unless otherwise indicated. Locate joints where least conspicuous.
H. Fabricate joints that will be exposed to weather in a manner to exclude water. Provide weep
holes where water may accumulate.
2.7 STEEL-FRAMED STAIRS
A. Manufacturers:
1. Alfab, Inc.
2. American Stair, Inc.
3. Worthington Metal Fabricators.
B. Stair Framing:
1. Where stairs are enclosed by gypsum board shaft-wall assemblies, provide hanger rods
or struts to support landings from floor construction above or below. Locate hanger rods
and struts where they will not encroach on required stair width and will be within the fire-
resistance-rated stair enclosure.
2. Where masonry walls support metal stairs, provide temporary supporting struts designed
for erecting steel stair components before installing masonry.
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C. Metal-Pan Stairs: Form risers, sub-tread pans, and sub-platforms to configurations shown from
steel sheet of thickness needed to comply with performance requirements indicated.
1. Provide sub-platforms of configuration indicated or, if not indicated, the same as sub-
treads. Weld sub-platforms to platform framing.
a. Smooth Soffit Construction: Construct sub-platforms with smooth soffits.
2.8 STEEL TUBE RAILINGS
A. General: Fabricate railings to comply with requirements indicated for design, dimensions,
details, finish, and member sizes, including wall thickness of tube, post spacings, and
anchorage, but not less than that needed to withstand indicated loads.
B. Welded Connections: Fabricate railings with welded connections. Cope components at
connections to provide close fit, or use fittings designed for this purpose. Weld all around at
connections, including at fittings.
C. Form changes in direction of railings as detailed.
D. Form simple and compound curves by bending members in jigs to produce uniform curvature
for each repetitive configuration required; maintain cross section of member throughout entire
bend without buckling, twisting, cracking, or otherwise deforming exposed surfaces of
components.
E. Close exposed ends of railing members with prefabricated end fittings.
F. Provide wall returns at ends of wall-mounted handrails, unless otherwise indicated. Close ends
of returns unless clearance between end of rail and wall is 1/4 inch or less.
G. Brackets, Flanges, Fittings, and Anchors: Provide wall brackets, end closures, flanges,
miscellaneous fittings, and anchors for interconnecting components and for attaching to other
work. Furnish inserts and other anchorage devices for connecting to concrete or masonry work.
1. Connect posts to stair framing by direct welding, unless otherwise indicated.
2. For non-galvanized railings, provide non-galvanized ferrous-metal fittings, brackets,
fasteners, and sleeves, except galvanize anchors embedded in exterior masonry and
concrete construction.
H. Fillers: Provide fillers made from steel plate, or other suitably crush-resistant material, where
needed to transfer wall bracket loads through wall finishes to structural supports. Size fillers to
suit wall finish thicknesses and to produce adequate bearing area to prevent bracket rotation
and overstressing of substrate.
2.9 STAIR RAILINGS
A. Comply with applicable requirements in Section 05 52 13 "Pipe and Tube Railings.”
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2.10 FINISHES
A. Comply with NAAMM's "Metal Finishes Manual for Architectural and Metal Products" for
recommendations for applying and designating finishes.
B. Finish metal stairs after assembly.
C. Preparation for Shop Priming: Prepare uncoated ferrous-metal surfaces to comply with
minimum requirements indicated below for SSPC surface preparation specifications and
environmental exposure conditions of installed products:
1. Interior Stairs (SSPC Zone 1A): SSPC-SP 3, "Power Tool Cleaning."
D. Apply shop primer to uncoated surfaces of metal stair components, except those to be
embedded in concrete or masonry unless otherwise indicated.
E. Refer to Specification Section 09 91 00 “Painting” for painting system requirements.
PART 3 - EXECUTION
3.1 INSTALLATION, GENERAL
A. Fastening to In-Place Construction: Provide anchorage devices and fasteners where necessary
for securing metal stairs to in-place construction. Include threaded fasteners for concrete and
masonry inserts, through-bolts, lag bolts, and other connectors.
B. Cutting, Fitting, and Placement: Perform cutting, drilling, and fitting required for installing metal
stairs. Set units accurately in location, alignment, and elevation, measured from established
lines and levels and free of rack.
C. Install metal stairs by welding stair framing to steel structure or to weld plates cast into concrete,
unless otherwise indicated.
D. Provide temporary bracing or anchors in formwork for items that are to be built into concrete,
masonry, or similar construction.
E. Fit exposed connections accurately together to form hairline joints. Weld connections that are
not to be left as exposed joints but cannot be shop welded because of shipping size limitations.
Do not weld, cut, or abrade surfaces of exterior units that have been hot-dip galvanized after
fabrication and are for bolted or screwed field connections.
F. Field Welding: Comply with the following requirements:
1. Use materials and methods that minimize distortion and develop strength and corrosion
resistance of base metals.
2. Obtain fusion without undercut or overlap.
3. Remove welding flux immediately.
4. At exposed connections, finish exposed welds and surfaces smooth and blended so no
roughness shows after finishing and contour of welded surface matches that of adjacent
surface.
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G. Place and finish concrete fill for treads and platforms to comply with Division 03 Section "Cast-
in-Place Concrete."
1. Install abrasive nosings with anchors fully embedded in concrete. Center nosings on
tread width.
H. Install pre-cast concrete treads with adhesive supplied by manufacturer.
3.2 INSTALLING METAL STAIRS WITH GROUTED BASEPLATES
A. Clean concrete and masonry bearing surfaces of bond-reducing materials, and roughen to
improve bond to surfaces. Clean bottom surface of base plates.
B. Set steel stair base plates on wedges, shims, or leveling nuts. After stairs have been positioned
and aligned, tighten anchor bolts. Do not remove wedges or shims but, if protruding, cut off
flush with edge of bearing plate before packing with grout.
1. Use nonmetallic, non-shrink grout, unless otherwise indicated.
2. Pack grout solidly between bearing surfaces and plates to ensure that no voids remain.
3.3 INSTALLING STEEL TUBE RAILINGS
A. Adjust railing systems before anchoring to ensure matching alignment at abutting joints. Space
posts at spacing indicated or, if not indicated, as required by design loads. Plumb posts in each
direction. Secure posts and rail ends to building construction as follows:
1. Anchor posts to steel by welding directly to steel supporting members.
2. Anchor handrail ends to concrete and masonry with steel round flanges welded to rail
ends and anchored with post-installed anchors and bolts.
B. Attach handrails to wall with wall brackets. Provide bracket with 1-1/2-inch clearance from
inside face of handrail and finished wall surface. Locate brackets as indicated or, if not
indicated, at spacing required to support structural loads. Secure wall brackets to building
construction as follows:
1. Use type of bracket with predrilled hole for exposed bolt anchorage.
2. For concrete and solid masonry anchorage, use drilled-in expansion shields and hanger
or lag bolts.
3. For hollow masonry anchorage, use toggle bolts.
4. For steel-framed gypsum board assemblies, fasten brackets directly to steel framing or
concealed steel reinforcements using self-tapping screws of size and type required to
support structural loads.
3.4 ADJUSTING AND CLEANING
A. Touchup Painting: Immediately after erection, clean field welds, bolted connections, and
abraded areas of shop paint, and paint exposed areas with the same material as used for shop
painting to comply with SSPC-PA 1 for touching up shop-painted surfaces.
1. Apply by brush or spray to provide a minimum 2.0-mil dry film thickness.
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B. Touchup Painting: Cleaning and touchup painting of field welds, bolted connections, and
abraded areas of shop paint are specified in Division 09 painting Sections.
END OF SECTION 05 51 00