Steel posts and signage. Aluminum ornamental shield
Steel letter forms for logotype on black granite planter
Miscellaneous angles, plates, bars, rods and other shapes, 10 gauge and lighter, not specified in other Sections but required to complete the Work.
Grouting for this work.
Related work provided by Owner:
Registered Deputy Inspector to inspect the fabrication, placement and welding of miscellaneous metal fabrications that are structural in nature in accordance with Building Code requirements.
3-16.1 QUALITY ASSURANCE-
Reference standards: The applicable provisions of the following govern the work of this Section, except as otherwise noted or specified.
American Institute of Steel Construction, AISC "Design, Fabrication and Erection of Structural Steel for Buildings".
American Institute of Steel and Iron, AISI "Specifications for the Design of Cold-Formed Steel Structural Members".
American Welding Society, AWS D-1.1 "Code for Welding in Building Construction". Steel Structures Painting Council, "Steel Structures Painting Manual".
Industrial Fasteners Institute, "Handbook on Bolt, Nut and Rivet Standards".
Reference publication: Architectural Metal Products - Reference Library of Technical Information, applicable manuals, published by Architectural Metal Products Division of National Association of Architectural Metal Manufacturers (NAAMM).
3-16.2 SUBMITTALS-
Large scale shop drawings clearly indicating in detail methods of fabrication and assembly, dimensions, weight and material, holes, lugs, inserts, finishes and other pertinent data.
Structural calculations: Submit structural calculations on miscellaneous metal items requiring engineering by Building Department and at other locations where items are of a structural nature or relate to life safety concerns, prepared, stamped and signed by a Structural Engineer licensed by the governing authority, showing they conform to applic- able Building Code and basic good engineering practice requirements.
Samples: Provide samples of specific items when directed by owner’s representative. 3-16.3 MATERIALS-
Metals: All metals exposed in the finished work shall be specially selected for straightness and flatness, and shall be free of fabrication marks, dents, scratches, oil canning, or other imperfections, as approved by the Architect. Refer to the Drawings to determine dimensions, wall thicknesses, etc.
Steel plates, bars and sheets:
Rolled shapes and plates: ASTM A36, except for plates to be cold-formed. Plates to be cold-formed: ASTM A283, Grade C.
Bars and bar-size shapes: ASTM A306, Grade 65, or ASTM A36.
Sheets: ASTM A446 or A526 with zinc coating conforming to ASTM A525, designation G90.
Hot-rolled carbon steel bars and bar-size shapes: ASTM A575. Carbon steel sheets and strips:
Hot-rolled: ASTM A568 and ASTM A569, pickled and oiled. Cold-rolled: ASTM A366.
Steel pipe: ASTM A53, Type E or S, Grade A. Steel tubing: ASTM A500 or ASTM A501. Iron castings:
Gray iron: ASTM A48, Class 30B. Malleable: ASTM A47.
Concrete and masonry anchors:
Self-drilling or non-drilling expansion types by Phillips Drill Co., Inc., Rawlplug Co., Inc., Star Expansion Industries, Inc.
Indicate the make, type and capacity of each type of anchor on the shop drawings. Fasteners:
Bolts, nuts, lag screws, machine screws and washers selected for the installation method and condition of use.
For assembling exterior assemblies, use hot-dip galvanized fasteners, unless galvanized after assembly.
Sample of exposed fasteners shall be submitted to Architect for visual approval. Welding electrodes:
Types recommended by AWS for the metals to be welded. Comply with AWS D1.1. Shop primer:
For ferrous metal fabrications installed at interior locations: 10-99 Tnemec Primer, by Tnemec Co., or equal by Porter International, or Valspar Corp.
For ferrous metal fabrications installed at exterior locations that cannot be hot-dip galva- nized: As specified hereafter for touch-up of damaged galvanized surfaces.
Touch-up for damaged galvanized surfaces and zinc-rich primer: Series 90-97 zinc Urethane, Tnemec Co., or equal by Porter International or Ameron.
Dry pack and grout: Non-metallic non-staining factory-packaged grout such as "Mast- erflow 713" by Master Builders, "Five Star Grout" by U.S. Grout Corp., "Fondag Non-Shrink Grout" by Specrete Products, Ltd., or equal.
3-16.4 FABRICATION- General:
For work exposed to view, use only smooth materials, free of blemishes such as pitting, seam marks, roller marks, trade names and roughness.
Remove blemishes by grinding before cleaning, treating, and applying specified finishes.
Screws exposed to view in finished surfaces shall be as indicated on Drawings.
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".
Form bent metal corners to the smallest radius possible without causing grain separation or otherwise impairing the work.
Form exposed connections with flush hairline joints, using concealed fasteners wherever possible.
Bend pipe and tubing without collapsing or deforming its walls, and to produce a smooth, uniform curved section and to maintain uniform sectional shape.
Fabricate joints which will be exposed to the weather to exclude water, or provide weep holes where water or condensation may accumulate.
Cut, reinforce, drill, punch, thread and tap miscellaneous metal work as required to re- ceive finish hardware and similar items of work.
Fabricate items in the largest sections practical to minimize field jointing.
All fabrications of a structural nature shall be fabricated under the continuous inspection of the Owner's Deputy Inspector.
Welding:
Weld shop and field connections continuously in accordance with AWS D1.1, unless bolted connections are specifically shown.
Grind welds not concealed in the finish work, smooth and flush to match and blend with parent metal surfaces.
Welders shall be qualified in accordance with AWS D1.1.
3-16.5 FINISHING-
Hot-dip galvanize all exterior ferrous metal items in accordance with ASTM A123 or A153 as applicable except where not practicable due to galvanizing process limitations. Safeguard assemblies against steel embrittlement in accordance with ASTM A143. Coating weight shall conform to paragraph 5.1 of ASTM A123, or Table 1 of ASTM A153, as applicable.
Apply a heavy coat of bituminous paint to metal surfaces in contact with concrete or masonry. Do not apply on exposed surfaces.
Shop-prime all other miscellaneous metal assemblies as follows.
Remove loose mill scale, loose rust, cutting and punching burrs, oil, grease and other deleterious materials before priming by SSPC SP6 Commercial Blast Clean.
Immediately after surface preparation, brush or spray primer in strict accordance with the paint manufacturer's printed instructions at the rate required to provide a uniform dry film thickness of not less than 1-1/2 mil per coat. Use painting methods which will result in full coverage of joints, corners, edges and all exposed surfaces.
Apply shop primer to completely cover all exposed surfaces as well as surfaces concealed after assembly. Allow paint to dry thoroughly before handling.
Apply one coat of primer to surfaces exposed in the finished work, and two coats to sur- faces which will be inaccessible after their assembly or erection.
3-16.6 EXAMINATION/PREPARATION-
Examine adjacent construction and make sure that conditions detrimental to the timely and proper performance of this work are corrected before proceeding with installation. Provide other trades with miscellaneous metal items to be embedded in their work. Where necessary, provide templates and instructions for this work.
3-16.7 INSTALLATION-
Fastening to in-place construction:
Provide anchorage devices and fasteners required for attaching miscellaneous metal work to in-place construction, including threaded fasteners for concrete and masonry inserts, toggle bolts, through-bolts, lag bolts, wood screws and other connectors required. Anchor bolts shall be proof tested by Contractor's Architect approved testing agency at Architect's discretion.
Dry-pack miscellaneous metal work supported on concrete as specified in Structural Engineer's Specifications to provide firm, level bearing surfaces.
Cutting, fitting and placing:
Perform all cutting, drilling and fitting required for installation of miscellaneous metals. Set items accurately in their proper location, alignment and elevation, plumb, level, true and free of rack as measured from established lines and levels.
Provide temporary bracing or anchors for items which are to be built into concrete, ma- sonry or similar construction.
Fitting: Fit exposed connections accurately to form flush, hairline joints. Weld connections which are not to be left as exposed joints, but cannot be shop welded because of shipping size limitations. Grind exposed joints smooth and flush with parent metal, and touch-up shop primer.
Field welding: Comply with AWS D1.1 for procedures of manual shielded arc welding, appearance and quality of welds made, and methods used to correct faulty welds.
3-16.8 TOUCH UP-
Damaged primer: Clean the damaged area, sand smooth, re-clean and spot-prime with the same paint as that used for shop priming.
Damaged zinc coating: Clean the damaged area, sand smooth, reclean and spot prime with a coat of the specified zinc-rich primer applied to a minimum dry film thickness of 2.5 to 3.5 mils, in compliance with the requirements of ASTM A780-87.