������������������������ SECTION 05512

 

��������������� ALTERNATING TREAD METAL STAIRS

 

This section is based on products manufactured by Lapeyre Stair, Inc., at the following address:

���� 220-R Laitram Lane, Harahan, LA 70123

���� Telephone:� 1-800-535-7631 or 1-504-733-6009

���� FAX:� 1-504 733-4393

 

The Lapeyre(TM) Stair is a custom built, space-saving industrial stair that meets OSHA requirements for non-public access.� The Lapeyre Stair's alternating tread design provides greater tread depth than vertical or ship's ladders while taking up no more room than a ship's ladder.� University safety studies conclude that The Lapeyre Stair is overwhelmingly safer than ship's ladders.

 

This section includes stairs made of aluminum, galvanized steel, and stainless steel.

PART 1� GENERAL

 

1.1 SECTION INCLUDES

Delete items below not required for project.

��� A.� Prefabricated steel stairs with integral handrails.

 

��� B.� Prefabricated steel platforms with integral handrails.

 

��� C.� Prefabricated stainless steel stairs with integral handrails.

 

��� D.� Prefabricated stainless steel platforms with integral handrails.

 

��� E.� Prefabricated aluminum stairs with integral handrails.

 

��� F.� Prefabricated aluminum platforms with integral handrails.

 

1.2 RELATED SECTIONS

Delete any sections below not relevant to this project;� add others as required.

��� A.� Section 05500 - Metal Fabrications:� Miscellaneous bracing and anchorage.

 

��� B.� Section 05510 - Metal Stairs:� Conventional prefabricated metal stairs.

 

��� C.� Section 09900 - Painting.

 

1.3 REFERENCES

 

��� A.� ASTM A 123 - Standard Specification for Zinc (Hot Dip Galvanized) Coatings on Iron and Steel Products.

 

��� B.� ASTM A 307 - Standard Specification for Carbon Steel Bolts and Studs, 60,000 PSI Tensile Strength.

 

��� C.� ASTM A 563 - Standard Specification for Carbon and Alloy Steel Nuts.

 

��� D.� ASTM A 513 - Standard Specification for Electric-Resistance-Welded Carbon and Alloy Steel Mechanical Tubing.

 

��� E.� ASTM A 569 - Standard Specification for Steel, Carbon (0.15 Maximum, Percent), Hot-Rolled Sheet and Strip Commercial Quality.

 

��� F.� ASTM A 780 - Standard Practice for Repair of Damaged Hot-Dip Galvanized Coatings.

 

1.4 PERFORMANCE AND DESIGN REQUIREMENTS

 

��� A.� Provide pre-engineered stairs designed to withstand the following loading conditions:

������� 1.� Stair treads:� Capable of withstanding a concentrated 1,000 pound load without deformation.

������� 2.� Handrail:� Capable of withstanding a load of 200 pounds applied in any direction at any point on the rail.

 

��� B.� Provide stairs with the following design features:

������� 1.� Alternating treads with center stringer.

������� 2.� Risers spaced equally to within 3/16 inch for adjacent risers and to within 3/8 inch for any two non-adjacent risers.

������� 3.� Handrails contoured for body guidance and underarm support.

Select at least one of the three angle requirements below and delete the others.

��� C.� Steel stair angle:� 56 degrees from horizontal.

 

��� D.� Steel stair angle:� 68 degrees from horizontal.

 

��� E.� Aluminum stair angle:� 68 degrees from horizontal.

 

��� F.� Vertical Drop:� Distance between upper finished floor surface where top landing will be attached and lower finished floor surface:

������� 1.� As indicated on Drawings.

������� 2.� _______________.

 

1.5 SUBMITTALS

 

��� A.� Submit under provisions of Section 01300.

 

��� B.� Product Data:� Provide manufacturer's installation instructions.

 

��� C.� Shop Drawings:� Submit dimensioned prints showing critical dimensions, jointing and connections, and fasteners provided by manufacturer.�

 

 

PART 2� PRODUCTS

 

2.1 MANUFACTURER

 

��� A.� Provide pre-engineered alternating tread metal stairs fabricated by Lapeyre Stair, Inc., 220-R Laitram Lane, Harahan, LA 70123.� Telephone 1-800-535-7631 or 1-504-733-6009.� FAX 1-504-733-4393.

������� 1.� Substitutions will not be acceptable.

 

2.2 MATERIALS

Edit the materials below to conform to project requirements.

��� A.� Structural Steel Components:� 1010/15, per ASTM A 569, size and gage to meet performance requirements and project dimensions.

������� 1.� Treads:� 13 gage HRPO.

������� 2.� Stair Landings and Foot Stampings:� 11 gage.

������� 3.� Stringers:� 2 in. by 1-3/4 in. by 11 gage.

Select stringers above for 56 degree stairs under 10 vertical feet and 68 degree stairs under 12 vertical feet.� Select stringers below for greater vertical drops up to 20 feet maximum.

������� 4.� Stringers:� 3 in. by 1-3/4 in. by 11 gage.

������� 5.� Platforms:� CS, 3/16 in. diamond safety plate.

 

��� B.� Steel Handrails:� 1010/15 CS per ASTM A 569, cold drawn, fully annealed tube per ASTM A 513, 1-1/2 inches OD by 0.083 in.

 

��� C.� Stainless Steel Structural Components:� Type 304 SS, size and gage to meet performance requirements.

������� 1.� Treads:� 13 gage.

������� 2.� Landings and Foot Stampings:� 11 gage.

������� 3.� Stringers:� 2 in. by 1-3/4 in. by 11 gage.

Select stringers above for 56 degree stairs under 10 vertical feet and 68 degree stairs under 12 vertical feet.� Select stringers below for greater vertical drops up to 20 feet maximum.

������� 4.� Stringers:� 3 in. by 1-3/4 in. by 11 gage.

������� 5.� Platforms:� 3/16 in. diamond safety plate.

���

��� D.� Stainless Steel Handrails:� Type 304 SS cold drawn, fully annealed tube per ASTM A 513, 1-1/2 inches OD by 0.065 in.

 

��� E.� Aluminum Landings, Treads, and Foot Castings:� Aluminum Alloy F356F.

 

��� F.� Aluminum Stringer:� Aluminum Alloy 6063-T52, box shape, 1-3/4 in. by 4 in. by 1/8 in.

�

��� G.� Aluminum Handrails:� Aluminum Alloy 6063-T4 Tube, 1-1/2 inches OD by 1/8 in.

 

��� H.� Aluminum Platforms:� Aluminum Alloy 5086, 1/4 in. diamond safety plate.

 

��� I.� Aluminum Platform Handrail Clamps:� Cast aluminum.

 

��� J.� Miscellaneous Materials:

������� 1.� Rubber spine:� Hollow neoprene.

������� 2.� Rubber foot divider:� Solid neoprene.

������� 3.� Bolts:� ASTM A 307.

������� 4.� Nuts:� ASTM A 563.

 

2.3 FABRICATION

 

��� A.� Fabricate components to comply with performance and design requirements specified and in accordance with approved shop drawings.� Fabricate to minimize field assembly.

 

��� B.� Steel Stairs:� Fabricate by gas metal arc welding, with stamped steel treads spot-welded to stringers.

������� 1.� Provide custom-fabricated steel handrails for field bolting to prefabricated stair unit.

������� 2.� Provide handrail design to accommodate field conditions indicated on Drawings.

 

��� C.� Stainless Steel Stairs:� Fabricate by gas tungsten arc welding or gas metal arc welding, with stamped steel treads spot-welded to stringers.

������� 1.� Provide custom-fabricated stainless steel handrails for field bolting to prefabricated stair unit.

������� 2.� Provide handrail design to accommodate field conditions indicated on Drawings.

 

��� D.� Aluminum Stairs:� Provide all welded construction, using gas metal arc welding or gas tungsten arc welding.� Fabricate using cast aluminum treads and cast aluminum mounting plates;� shop weld handrails to stair assembly.

 

��� E.� Platforms:� Provide cut, formed, and punched platforms with mounting brackets and kickplates, configured and sized as indicated on Drawings.

������� 1.� Steel construction:� Fabricate using gas metal arc welding.

������� 2.� Stainless steel construction:� Fabricate using gas tungsten arc welding or gas metal arc welding.

������� 3.� Aluminum construction:� Fabricate using gas tungsten arc welding or gas metal arc welding.

������� 4.� Handrails:� Provide bolt-on handrails of same material as platform construction.

 

2.4 FINISHES

Edit finish requirements to conform to stair materials.� Factory-applied paint finish for steel stairs is optional.

��� A.� Galvanizing:� Hot-dip galvanize steel components in accordance with ASTM A 123.

 

��� B.� Paint:� Apply finish coat of manufacturer's safety yellow powder coating.

 

��� C.� Stainless Steel:� Natural finish.

 

��� D.� Aluminum:� Natural finish.

 

 

PART 3� EXECUTION

 

3.1 EXAMINATION

 

��� A.� Verify that dimensions are correct and substrate is in proper condition for installation of metal stair components.� Do not proceed with installation until unsatisfactory conditions have been corrected.

 

3.2 PREPARATION

Delete the following paragraph if all stairs are aluminum.

��� A.� Install handrails to stair unit, using bolts furnished with stair unit by manufacturer.

 

��� B.� Install bumper on central stringer, following manufacturer's instructions and using glue supplied with stair unit.

 

��� C.� Prepare mounting holes, using drawings supplied by stair manufacturer.

 

3.3 INSTALLATION

 

��� A.� Position stair units with top tread at same elevation as finished floor or roof surface.

 

��� B.� Verify that stairs are properly aligned with building construction, at correct angle, and free from distortion.� Secure in position using not fewer than two bolts or studs at top and two at bottom.

 

��� C.� Install crossover or landing platform with stair, securing with two bolts and handrail clamps.� Bolt handrails in place.

 

��� D.� Do not field cut or alter members.

 

3.4 ADJUST AND CLEAN

 

��� A.� Touch up damage to galvanized surfaces using galvanizing repair paint in accordance with ASTM A 780.

Delete paragraphs above and below if project requires only aluminum or stainless steel stairs.

��� B.� Touch up abraded areas on shop paint immediately after erection, using matching paint.

 

��� C.� Clean work area of debris associated with installation of alternating tread metal stairs.

 

 

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