05 51 33_AM 6.pdf

REPAIR BUILDING 606, GENERAL INSTRUCTION BUILDING W912DS19C0034

USMA, WEST POINT, NY PN 94078

SECTION 05 51 33

METAL LADDERS

02/16, CHG 2: 02/18

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 LADDER INSTITUTE (ALI)

ALI A14.3 (2008; R 2018) Ladders - Fixed - Safety Requirements

AMERICAN WELDING SOCIETY (AWS)

AWS D1.1/D1.1M (2020; Errata 1 2021) Structural Welding Code - Steel

ASTM INTERNATIONAL (ASTM)

ASTM A36/A36M (2019) Standard Specification for Carbon Structural Steel

ASTM A47/A47M (1999; R 2022; E 2022) Standard Specification for Ferritic Malleable Iron Castings

ASTM A53/A53M (202 2) Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless

ASTM A123/A123M (2017) Standard Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products

ASTM A153/A153M (20 23) Standard Specification for Zinc Coating (Hot-Dip) on Iron and Steel Hardware

ASTM A500/A500M (2021a) Standard Specification for Cold-Formed Welded and Seamless Carbon Steel Structural Tubing in Rounds and Shapes

ASTM A653/A653M (2020) Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by the Hot-Dip Process

ASTM A780/A780M (2020) Standard Practice for Repair of Damaged and Uncoated Areas of Hot-Dip Galvanized Coatings

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ASTM A924/A924M (2022) Standard Specification for General Requirements for Steel Sheet, Metallic-Coated by the Hot-Dip Process

ASTM B633 (2019) Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel

ASTM D1187/D1187M (1997; E 2011; R 2011) Asphalt-Base Emulsions for Use as Protective Coatings for Metal

ASTM F1941 (2010) Standard Specification for Electrodeposited Coatings on Threaded Fasteners (Unified Inch Screw Threads

(UN/UNR))

MASTER PAINTERS INSTITUTE (MPI)

MPI 79 (2016) Primer, Alkyd, Anti-Corrosive for Metal

SOCIETY FOR PROTECTIVE COATINGS (SSPC)

SSPC SP 6/NACE No.3 (2007) Commercial Blast Cleaning

U.S. NATIONAL ARCHIVES AND RECORDS ADMINISTRATION (NARA)

29 CFR 1910.23 (Nov 2016) Ladders

1.2 SUBMITTALS

Government approval is required for submittals with a "G" or "S" classification. Submittals not having a "G" or "S" classification are for information only. When used, a code following the "G" classification 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

Ladders , Installation Drawings ; G, AE

Manufactured Alternating Tread Device ; G, AE

SD-03 Product Data

Ladders ; G, AE

SD-05 Design Data

Design Calculations

SD-07 Certificates

Fabricator Certification for Ladder Assembly ; G, AE

Fabricator Certification for Manufactured Alternating Tread Device Assembly ; G, AE

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1.3 QUALITY CONTROL

Provide Fabricator Certification for Ladder assembly stating that the ladder and associated components have been fabricated according to the requirements of 29 CFR 1910.23 .

Provide fabricator certification for Manufactured Alternating Tread Device assembly stating that the assembly and associated components have been fabricated according to the requirements of 29 CFR 1910.23 .

1.3.1 Shop Drawings

Include plans, elevations, sections, details, and attachments to other work. Indicate sizes, spacing and locations of structural members. Include details of connections, splices, attachments, and other pertinent data.

Indicate welds by standard AWS symbols, distinguishing between shop and field welds, and show size, length, and type of each weld. Indicate all AWS weld designations for pre-qualified full or partial penetration welds and detail all joint preparations. Provide erection details of all field welded connections. Indicate type, size, and length of bolts, distinguishing between shop and field bolts. Detail material required for the connection of other work. The Professional Structural Engineer's signature and seal shall appear on all structural steel shop drawings (including erection drawings, piece drawings and connection calculations.

Cloud, bubble, or otherwise highlight and identify all revisions on the drawings. Submittals which do not identify changes and revisions will be returned as "Not Reviewed".

1.3.2 Design Calculations

Design Calculations for metal ladders: Design metal ladders under direct supervision of the manufacturer employed Professional Engineer. Prepare and submit written and graphic information, including, but not limited to, performance and design criteria, list of applicable codes and regulations, and calculations. Include load diagrams if applicable. Provide name and version of software, if any, used for calculations. Include page numbers and a coordinated table of contents. Design Calculations submittal shall be signed and sealed by a qualified Professional Engineer licensed in New York State. If criteria indicated are not sufficient to perform services or certification required, submit a written request for additional information to Architect. Design Calculations submission must be concurrent with the submission of corresponding Fabrication drawings.

Fabrication drawings submitted without corresponding Design Calculations will be returned as "Not Reviewed". Design Calculations shall be submitted for information only.

1.3.2.1 Certification Letter from Contractor's Professional Engineer

Prior to the submission of Shop Drawings, Product Data, Design Calculations and other required submittals, submit a Certification Letter from the Contractor's responsible design Professional Engineer. No shop drawings will be reviewed by the Architect prior to the submission and acceptance of this Certification Letter. Certification Letter shall be submitted for information only. The Certification Letter shall include the following:

Signature and seal of the registered Professional Engineer (registered in the state or district in which the project is located).

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b. Statement that the Professional Engineer is fully experienced in the design of Metal Ladders.

c. Statement that all calculations and shop drawings are in accordance with the Contract Documents and applicable building codes and have been prepared under the direction of the Professional Engineer.

d. Statement that the Professional Engineer's signature and seal shall appear on all design calculations and on all shop drawings.

e. Statement that the Professional Engineer will submit an additional signed and sealed letter at the completion of the work related to this section stating that the fabrication and installation of the Metal Ladders have been performed in accordance with the Professional Engineer's design.

1.3.3 Qualification Of Welders

Qualify welders in accordance with AWS D1.1/D1.1M . Use procedures, materials, and equipment of the type required for the work.

1.3.4 Delivery, Storage, And Protection

Protect from corrosion, deformation, and other types of damage. Store items in an enclosed area free from contact with soil and weather. Remove and replace damaged items with new items.

PART 2 PRODUCTS

2.1 MATERIALS

2.1.1 Structural Carbon Steel

ASTM A36/A36M.

2.1.2 Structural Tubing

ASTM A500/A500M .

2.1.3 Steel Pipe

ASTM A53/A53M, Type E or S, Grade B.

2.1.4 Fittings for Steel Pipe

Standard malleable iron fittings ASTM A47/A47M.

2.2 FABRICATION FINISHES

2.2.1 Galvanizing

Hot-dip galvanize items specified to be zinc-coated, after fabrication where practicable. Galvanizing: ASTM A123/A123M , ASTM A153/A153M , ASTM A653/A653M or ASTM A924/A924M , G90 , as applicable.

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2.2.2 Galvanize

Zinc-plated anchor bolts, washers, and parts or devices necessary for proper installation complying with ASTM B633 or ASTM F1941, Class FE/ZN 12 .

2.2.3 Repair of Zinc-Coated Surfaces

Repair damaged surfaces with galvanizing repair method and paint conforming to ASTM A780/A780M or by application of stick or thick paste material specifically designed for repair of galvanizing, as approved by Contracting Officer. Clean areas to be repaired and remove slag from welds. Heat surfaces to which stick or paste material is applied, with a torch to a temperature sufficient to melt the metallics in stick or paste;

spread molten material uniformly over surfaces to be coated and wipe off excess material.

2.2.4 Shop Cleaning and Painting

2.2.4.1 Surface Preparation

Blast clean surfaces in accordance with SSPC SP 6/NACE No.3 . Wash cleaned surfaces which become contaminated with rust, dirt, oil, grease, or other contaminants with solvents until thoroughly clean.

2.2.4.2 Pretreatment, Priming and Painting

Apply pretreatment, primer, and paint in accordance with manufacturer's printed instructions.

2.3 LADDERS

Fabricate vertical ladders conforming to 29 CFR 1910.23 and Section 5 of ALI A14.3 . Ladders shall be capable of supporting their maximum intended load. Use 2 1/2 by 3/8 inch steel flats for stringers galvanized steel rods for rungs with slip resistance coating, unless indicated otherwise on Drawings . Rungs must be plug welded or shouldered and headed into stringers. Install ladders so that the maximum perpendicular distance from the centerline of the steps or rungs, or grab bars, or both, to the nearest permanent object in the back of the ladder or to the finished wall surface will not be less than 7 inches , except for the elevator pit ladders, which have a minimum perpendicular distance of 4.5 inches .

Provide heavy clip angles riveted or bolted to the stringer and drilled for not less than two 1/2 inch diameter expansion bolts as indicated.

Provide intermediate clip angles not over 48 inches on centers. The top rung of the ladder must be level with the top of the access level, parapet or landing served by the ladder except for hatches or wells. Extend the side rails of through or side step ladders 42 inches above the access level. See the Drawings for additional dimensions and details.

Galvanize exterior and elevator pit ladders and components. Factory paint interior assemblies safety yellow.

2.3.1 Bar Grate Platforms

See Section 05 51 00 METAL STAIRS.

2.3.2 Manufactured Alternating Tread Device

Provide pre-manufactured, factory engineered assembly. Fabricate stringers

SECTION 05 51 33 Page 5 and framing of steel plate or shapes. Bolt, rivet or weld connections and anchor to supporting construction. Provide railings as specified for metal handrails as an integral part of device assembly. See Drawings for additional dimensions and details .

Fabricate Alternating Tread Devices: to withstand the effects of gravity loads and the following loads and stresses within limits and under conditions indicated.

a. Uniform Load: 100 lbs/sq. ft. (479 kN/sq.m)

b. Concentrated Load: 300 lbf (133 kN) applied on an area of 4 sq.in.

(2580 sq. mm).

c. Uniform and concentrated loads need not be assumed to act concurrently.

d. Alternating Tread Device Framing: Capable of withstanding stresses resulting from railing loads in addition to loads specified above.

Tread depth shall be not less than 8-1/2 inches (216 mm) exclusive of nosing or less than 10-1/2 inches (267 mm) including the nosing, tread width shall be not less than 7 inches (178 mm), and riser height shall be not more than 8 inches (203 mm).

a. Fabricate treads with non-slip surface using manufacturer's standard design.

Factory paint assembly safety yellow.

PART 3 EXECUTION

3.1 GENERAL INSTALLATION REQUIREMENTS

Install items at locations indicated, according to manufacturer's instructions. Verify all measurements and take all field measurements necessary before fabrication. Provide Exposed fastenings of compatible materials, generally matching in color and finish, and harmonize with the material to which fastenings are applied. Include materials and parts necessary to complete each item, even though such work is not definitely shown or specified. Poor matching of holes for fasteners will be cause for rejection. Conceal fastenings where practicable. Thickness of metal and details of assembly and supports must provide strength and stiffness.

Formed joints exposed to the weather to exclude water. Items listed below require additional procedures.

3.2 WORKMANSHIP

Metalwork must be well formed to shape and size, with sharp lines and angles and true curves. Drilling and punching must produce clean true lines and surfaces. Continuously weld along the entire area of contact.

Do not tack weld exposed connections of work in place. Grid smooth exposed welds. Provide smooth finish on exposed surfaces of work in place, unless otherwise approved. Where tight fits are required, mill joints. Cope or miter corner joints, well formed, and in true alignment.

Install in accordance with manufacturer's installation instructions and approved drawings, cuts, and details.

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3.3 ANCHORAGE, FASTENINGS, AND CONNECTIONS

Provide anchorage where necessary for fastening metal items securely in place. Include for anchorage not otherwise specified or indicated slotted inserts, expansion anchors, and powder-actuated fasteners, when approved for concrete; toggle bolts and through bolts for masonry; machine bolts, carriage bolts and powder-actuated threaded studs for steel; through bolts, lag bolts, and screws for wood. Do not use wood plugs in any material. Provide non-ferrous attachments for non-ferrous metal. Make exposed fastenings of compatible materials, generally matching in color and finish, to which fastenings are applied. Conceal fastenings where practicable.

3.4 WELDING

Perform welding, welding inspection, and corrective welding, in accordance with AWS D1.1/D1.1M . Use continuous welds on all exposed connections.

Grind visible welds smooth in the finished installation.

3.5 FINISHES

3.5.1 Dissimilar Materials

Where dissimilar metals are in contact, protect surfaces with a coat conforming to MPI 79 to prevent galvanic or corrosive action. Where aluminum is in contact with concrete, plaster, mortar, masonry, wood, or absorptive materials subject to wetting, protect with ASTM D1187/D1187M , asphalt-base emulsion.

3.5.2 Field Preparation

Remove rust preventive coating just prior to field erection, using a remover approved by the rust preventive manufacturer. Surfaces, when assembled, must be free of rust, grease, dirt and other foreign matter.

3.5.3 Environmental Conditions

Do not clean or paint surface when damp or exposed to foggy or rainy weather, when metallic surface temperature is less than 5 degrees F above the dew point of the surrounding air, or when surface temperature is below 45 degrees F or over 95 degrees F , unless approved by the Contracting Officer.

3.6 LADDERS

Secure to the adjacent construction with the clip angles attached to the stringer. Secure to masonry or concrete with not less than two 1/2 inch diameter expansion bolts. Install intermediate clip angles not over 48 inches on center. Install brackets as required for securing of ladders welded or bolted to structural steel or built into the masonry or concrete. support e nds of ladders as indicated on drawings.

3.7 ALTERNATING TREAD DEVICE

Secure to building structure at top and bottom of assembly. Coordinate exact location with floor opening at top of device. Install coil system to maintain continuous fall protection.

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