SECTION METAL FABRICATIONS

Transcription

1 SECTION METAL FABRICATIONS PART 1 GENERAL 1.01 SUMMARY A. Related Sections: Cast-In-Place Concrete Precast, Prestress Concrete Sections Concrete Unit Masonry Painting Identifying Devices REFERENCES A. American Society for Testing and Materials (ASTM): 1. A36/A-96 Specification for Carbon Structural Steel. 2. A53-96 Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless. 3. A123-89a Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products. 4. A Specification for Carbon Steel Bolts and Studs, 60,000 psi Tensile Strength. 5. A Specification for Structural Bolts, Steel, Heat Treated, 120/105 ksi Minimum Tensile Strength. 6. A385-80(96) Practice for Providing High Quality Zinc Coatings (Hot-Dip) 7. A Specification for Hot-Formed Welded and Seamless Carbon Steel Structural Tubing. 8. B Specification for Aluminum and Aluminum- Alloy Sheet and Plate. 9. B221M-96 Specification for Aluminum and Aluminum- Alloy Extruded Bars, Rods, Wire, Profiles, and Tubes (Metric). B. American National Standards Institute (ANSI) A14.3 for fixed ladders. C. Occupational Safety and Health Administration (OSHA). Project No. SPECIFICATION GUIDELINES

2 1.03 SUBMITTALS A. Shop and erection drawings for review before starting work. PART 2 PRODUCTS 2.01 MANUFACTURED UNITS NOTE TO SPECIFIER: Provide roof access through roof scuttles with fixed ship's ladders. Do not substitute with fixed exterior vertical ladders. A. Roof Access: 1. Ship's Ladders: Steel construction complying with ANSI A14.3 and OSHA, 63 to 75 degrees from horizontal, and handrails at both sides. B. TV Brackets: 1. Yoke mount with tray, wall mounted, for 25 to 27 inch televisions. a. TVWW3027-BK by Bretford, Franklin Park, IL. b. JMW 2650 by Peerless, Melrose Park, IL. NOTE TO SPECIFIER: Verify program requirements for use of VCR mounts. 2. VCR mount: a. VCR4-BK by Bretford, Franklin Park, IL. b. DS 40 by Peerless, Melrose Park, IL. 3. Accessories: a. WSP 414 interior wall plate by Peerless or accepted equivalent for studs at 16" o.c. b. WSP interior/exterior wall plate by Peerless or accepted equivalent for studs at 16" o.c. c. WSP interior/exterior wall plate by Peerless or accepted equivalent for studs at 24" o.c. d. 6" x 12" wall plate by Peerless or accepted equivalent for concrete using expansion bolts or Project No. SPECIFICATION GUIDELINES

3 for attachment to face of stud. e. WSP 415 back-up plate by Peerless or accepted equivalent for masonry on opposite wall. 4. See Section Identifying Devices for safety padding at televisions below 6'-8" AFF. C. Security Grilles: 1. Able to withstand a 200-pound force applied to any point from any direction and reject a 1/2" diameter sphere gage, powder coat finish, G-90 galvanized steel, with 50 percent minimum open area. 3. Manufacturers: a. Crime Shield Barriers by Exeter, Wyoming, PA. b. Securiperf Security Screens by Security Sales Company, Miami, FL. D. Security Grilles - Missile Impact Resistant: 1. Certified missile impact resistant gage, powder coat finish, A40 galvannealed steel, with 50 percent minimum open area. 3. Manufacturers: a. Storm Shield Barriers by Exeter, Wyoming, PA. b. SureGuard Hurricane Barriers by Phoenix, Lawrenceville, GA. E. V Security Screens - Missile Impact Resistant: 1. Certified missile impact resistant. 2. Type 304 stainless steel, No. 12 mesh, 0.028" diameter, with aluminum alloy frame. 3. Manufacturers: a. Protect Series, by Protech Screens, Pearland, TX. b. Accepted equivalent. F. Corner Guards: 1. No. 991, 48 inches long, 18 gage stainless steel by Bradley or accepted equivalent. G. Stair Nosings with Full Length Anchors: Project No. SPECIFICATION GUIDELINES

4 1. Exterior/Interior: 2.02 MATERIALS a by American Safety Tread, Helena, AL. b. 231 by Wooster Products, Wooster, OH. A. Aluminum Alloy Extrusions: ASTM B221M, 6063-T5 or 6063-T52. B. Aluminum Alloy Sheet and Plate: ASTM B209, 5050-H32 or temper best suited. C. Structural Steel Shapes, Plates, Flat Bars, and Rods: ASTM A36M, Grade 36. D. Steel Pipe: ASTM A53. E. Columns: 1. Steel Tube: ASTM A Other Columns: As shown. F. Welding Electrodes for Steel: AWS A5.1-69, Class E60 and E70 for manual welds. G. Bolts, smaller than 1/2" diameter: ASTM A307. H. Bolts, 1/2" diameter and larger: ASTM A325. I. Concrete Expansion Bolts: Galvanized steel self-drilling type as manufactured by: 1. Philips Drill Co., Michigan City, IN. 2. Rawl Plug Co., Inc., New Rochelle, NY. 3. Star Expansion Industries Corp., Mountainville, NY. J. Galvanized Metal Repair Compound: 1. Hot Applied: Federal Specifications O-G Cold Applied: Galvaneal, Galvicon, or Z.R.C. K. Shop Prime Coat: Zinc chromate primer. L. Stainless Steel Shapes and Plates: Type 304 with stainless fasteners. Project No. SPECIFICATION GUIDELINES

5 M. Isolation Coating: Zinc chromate paint or acceptable nonconductive tape. N. Fastenings, Anchors and Bolts: 1. Provide required cast-in-place or built-in anchor bolts for miscellaneous metal items of galvanized steel, complete with matching washers and nuts. 2. Where not practical to prelocate bolts, provide selfdrilling or toggle type concrete anchors. O. Hot Dip Galvanizing: Where specified or indicated, hot dip galvanize ferrous items according to ASTM A385 and ASTM A123, minimum 2.0 ounces per square foot FABRICATION A. Repair to Galvanized Surfaces: Repair damaged galvanized surfaces with hot or cold applied compound. B. Shop Painting of Ferrous Metal Items: Provide 1 coat of shop primer unless indicated or specified to be hot dip galvanized. C. Contact With Dissimilar Materials. Provide isolation coating where dissimilar metals are in contact or where aluminum contacts masonry, concrete, plaster, or mortar. D. Fabricate ferrous items according to AISC Specifications and approved shop drawings. 1. Grind and buff smooth rough edges, sharp corners, and welded joint of exposed steel and miscellaneous ferrous items. E. Concrete filled metal filled pan stairs may have treads precast and delivered to job site integral with pan at option of Contractor. Landings shall be engineered to have a live load capacity of 100 psf. PART 3 EXECUTION 3.01 INSTALLATION A. Coordination: Coordinate miscellaneous metal items, including field dimensions where required with masonry Project No. SPECIFICATION GUIDELINES

6 openings and various other trades as applicable so items fit and function as intended. B. Erect and install miscellaneous metal items at proper locations and elevations, plumb, level, in alignment and not distorted by fastenings, according to approved shop and erection drawings, manufacturer's directions, and as specified. Provide adequate temporary supports to allow field connections of members without misalignment. C. Install TV brackets according to the following: 1. At instructional spaces or other spaces with a ceiling of 9'-0" or less, 5'-6" from TV mounting tray to finish floor, with safety padding. See Contract Documents for bracket locations. 2. At media centers, auditoriums, music classrooms, cafeterias, or other spaces with a ceiling 10'-0" or greater, 6'-8" minimum clearance from bottom of bracket assembly, including VCR mount if program required, to finish floor. See Contract Documents for bracket locations. 3. Comply with manufacturer s installation guidelines for brackets and mounting conditions. 4. Install revolving adaptor or spindle nut with locking screws to prevent tray and bracket separation caused by bracket rotation. D. Supplementary Parts: Furnish and install necessary to complete each item. E. Conform to best quality and accepted standard practice. F. Weld on back or bottom side so welds are not visible. G. Provide acceptable fasteners, inserts, and expansion anchors for supports placed in shear position where possible. H. Powder activated fasteners are not allowed. I. Install interior stair nosings to full step length FIELD QUALITY ASSURANCE A. Touch up abrasions to shop prime surfaces and welds with specified primer after erection and installation operations are complete. Project No. SPECIFICATION GUIDELINES

7 END OF SECTION Project No. SPECIFICATION GUIDELINES