05 51 33 Metal Ladders.pdf

KRSM 072115 Catwalks to Overhead HVAC, Building 238 Hill AFB, Utah

METAL LADDERS 05 51 33 - 1

SECTION TABLE OF CONTENTS

DIVISION 05 - METALS

SECTION 05 51 33

METAL LADDERS

08/08

PART 1 GENERAL

1.1 REFERENCES

1.2 SUBMITTALS

1.3 DELIVERY, STORAGE, AND PROTECTION

PART 2 PRODUCTS

2.1 MATERIALS

2.1.1 Structural Carbon Steel

2.1.2 Structural Tubing

2.1.3 Steel Pipe

2.1.4 Fittings for Steel Pipe

2.1.5 Aluminum Alloy Products

2.2 FABRICATION FINISHES

2.2.1 Galvanizing

2.2.2 Repair of Zinc-Coated Surfaces

2.2.3 Shop Cleaning and Painting

2.2.3.1 Surface Preparation

2.2.3.2 Pretreatment, Priming and Painting

2.2.4 Nonferrous Metal Surfaces

2.2.5 Aluminum Surfaces

2.2.5.1 Surface Condition

2.2.5.2 Aluminum Finishes

2.3 LADDERS

2.3.1 Vertical Ladder

PART 3 EXECUTION

3.1 GENERAL INSTALLATION REQUIREMENTS

3.2 WORKMANSHIP

3.3 ANCHORAGE, FASTENINGS, AND CONNECTIONS

3.4 WELDING

3.5 FINISHES

3.5.1 Dissimilar Materials

3.5.2 Field Preparation

3.5.3 Environmental Conditions

3.6 LADDERS

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METAL LADDERS 05 51 33 - 2

SECTION 05 51 33

METAL LADDERS

08/08

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.

ALUMINUM ASSOCIATION (AA)

AA 46 (1978) Standards for Anodized Architectural Aluminum AA DAF-45 (2003) Designation System for Aluminum Finishes

AMERICAN WELDING SOCIETY (AWS)

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

ASTM INTERNATIONAL (ASTM)

ASTM A 123/A 123M (2008) Standard Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products ASTM A 153/A 153M (2005) Standard Specification for Zinc Coating (Hot-Dip) on Iron and

Steel Hardware ASTM A 36/A 36M (2008) Standard Specification for Carbon Structural Steel ASTM A 47/A 47M (1999; R 2004) Standard Specification for Steel Sheet, Aluminum-

Coated, by the Hot-Dip Process ASTM A 500/A 500M (2007) Standard Specification for Cold-Formed Welded and Seamless

Carbon Steel Structural Tubing in Rounds and Shapes Zinc-Coated, Welded and Seamless

ASTM A 653/A 653M ( 2008) Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by the Hot-Dip Process

ASTM A 780 (2001; R 2006) Standard Practice for Repair of Damaged and Uncoated Areas of Hot-Dip Galvanized Coatings

ASTM A 924/A 924M (2008a) Standard Specification for General Requirements for Steel Sheet, Metallic-Coated by the Hot-Dip Process

ASTM B 108/B 108M (2008) Standard Specification for Aluminum-Alloy Permanent Mold Castings

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 B 221 (2008) Standard Specification for Aluminum and Aluminum-Alloy Extruded Bars, Rods, Wire, Profiles, and Tubes

ASTM B 221M (2007) Standard Specification for Aluminum and Aluminum-Alloy Extruded Bars, Rods, Wire, Profiles, and Tubes (Metric)

ASTM B 26/B 26M (2005) Standard Specification for Aluminum-Alloy Sand Castings ASTM D 1187 (1997; R 2002e1) Asphalt-Base Emulsions for Use as Protective

Coatings for Metal

MASTER PAINTERS INSTITUTE (MPI)

MPI 79 (Jan 2004) Alkyd Anti-Corrosive Metal Primer

THE SOCIETY FOR PROTECTIVE COATINGS (SSPC)

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SSPC SP 3 (2004; E 2004) Power Tool Cleaning SSPC SP 6 (2007) Commercial Blast Cleaning

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

29 CFR 1910.27 Fixed Ladders

1.2 SUBMITTALS

Government approval is required for submittals with a "G" designation; submittals not having a "G" designation are for information only.. Submit the following in accordance with Section 01 00 00 paragraph SUBMITTALS.

SD-02 Shop Drawings Vertical Ladders, installation drawings

SD-03 Product Data Vertical Ladders

1.3 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 A 36/A 36M.

2.1.2 Structural Tubing. ASTM A 500/A 500M.

2.1.3 Steel Pipe. ASTM A 53/A 53M, Type E or S, Grade B.

2.1.4 Fittings for Steel Pipe. Standard malleable iron fittings ASTM A 47/A 47M.

2.1.5 Aluminum Alloy Products Conform to ASTM B 209M ASTM B 209 for sheet plate, ASTM B 221M ASTM B 221 for extrusions and ASTM B 26/B 26M or ASTM B 108/B 108M for castings, as applicable. Provide aluminum extrusions at least 3 mm 1/8 inch thick and aluminum plate or sheet at least 1.3 mm 0.050 inch thick.

2.2 FABRICATION FINISHES

2.2.1 Galvanizing. Hot-dip galvanize items specified to be zinc-coated, after fabrication where practicable. Galvanizing: ASTM A 123/A 123M, ASTM A 153/A 153M, ASTM A 653/A 653M or ASTM A 924/A 924M, Z275 G90, as applicable. Galvanize anchor bolts, washers, and parts or devices necessary for proper installation, unless indicated otherwise.

2.2.2 Repair of Zinc-Coated Surfaces. Repair damaged surfaces with galvanizing repair method and paint conforming to ASTM A 780 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.

2.2.3 Shop Cleaning and Painting

2.2.3.1 Surface Preparation. Blast clean surfaces in accordance with SSPC SP 6.

Surfaces that will be exposed in spaces above ceiling or in attic spaces, crawl spaces, furred spaces, and chases may be cleaned in accordance with SSPC SP 3 in lieu of being blast cleaned. Wash cleaned surfaces which become contaminated with rust, dirt, oil, grease, or other contaminants with solvents until thoroughly clean.

2.2.3.2 Pretreatment, Priming and Painting. Apply pretreatment, primer, and paint in accordance with manufacturer's printed instructions. On surfaces concealed in

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the finished construction or not accessible for finish painting, apply an additional prime coat to a minimum dry film thickness of 0.03 mm 1.0 mil. Tint additional prime coat with a small amount of tinting pigment.

2.2.4 Nonferrous Metal Surfaces. Protect by plating, anodic, or organic coatings.

2.2.5 Aluminum Surfaces

2.2.5.1 Surface Condition. Before finishes are applied, remove roll marks, scratches, rolled-in scratches, kinks, stains, pits, orange peel, die marks, structural streaks, and other defects which will affect uniform appearance of finished surfaces.

2.2.5.2 Aluminum Finishes. Unexposed plate and extrusions may have mill finish as fabricated. Sandblast castings' finish, medium, AA DAF-45, or AA 46. Unless otherwise specified, provide all other aluminum items with standard mill finish. Provide a coating thickness not less than that specified for protective and decorative type finishes for items used in interior locations or architectural Class I type finish for items used in exterior locations in AA DAF-45.

2.3 LADDERS

Fabricate vertical ladders conforming to Section 7 of 29 CFR 1910.27. Use 65 by 10 mm 2 1/2 by 3/8 inch steel flats for stringers and 20 mm 3/4 inch diameter steel rods for rungs. Rungs to be not less than 400 mm 24 inches wide, spaced more than one foot apart, plug welded or shouldered and headed into stringers. Install ladders so that the distance from the rungs to the finished wall surface will not be less than 175 mm 7 inches. Provide heavy clip angles riveted or bolted to the stringer.

Provide intermediate clip angles not over 1200 mm 48 inches on centers.

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. Continously 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.

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 shields, and powder-driven fasteners, when approved for concrete;

toggle bolts and through bolts for masonry; machine and carriage bolts 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.

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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 D 1187, 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 -15 degrees C 5 degrees F above the dew point of the surrounding air, or when surface temperature is below 7 degrees C or over 35 degrees C 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.

Install intermediate clip angles not over 1200 mm 48 inches on center. Install brackets as required for securing of ladders welded or bolted to structural steel.

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