SECTION HANDRAILS AND RAILINGS

Transcription

1 SECTION HANDRAILS AND RAILINGS PART 1 - GENERAL 1.1 DESCRIPTION A. The extent of handrails and railings is shown on the drawings, and includes miscellaneous handrails and railings not included in other metal systems in other sections of these specifications. B. Samples, Handrails, and Railings: If requested, submit to the Engineer one (1) sample of each type of metal finish, including typical welded connections, not less than 6" long. Samples will be reviewed for color ani texture only. Compliance with all other requirements is the exclusive responsibility of the Contractor. C. Submit shop drawings in accordance with General Requirements. Drawings will show locations, dimensions, sections, details of construction and assembly, method of installation and all other pertinent information D. All rails shall have internal line-up members at joints. E. All handrails shall meet OSHA Standards. PART 2- PRODUCTS 2.1 ALUMINUM EXTRUSIONS: ASTM B 221; alloy 6063-TS, except alloy 6063-T6 for pipe; unless otherwise indicated 1 1/2" diameter, Schedule 40. Clear anodized finish, Type A orb, (ASTM B 580), unless otherwise indicated 2.2 HARDWARE: The hardware shall be of stainless steel construction. 2.3 MANUFACTURERS A. Imperial Ornamental Metal Company, Inc. B. Dittmer Architectural Aluminum C. Construction Specialties Company D. Or Approved Equal PART 3 -EXECUTION 3.1 FABRICATION A. General: 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", unless otherwise shown. Form bent-metal corners to the smallest radius possible without causing grain separation or otherwise impairing the work. B. Nonwelded Connections are generally not acceptable except to join adjacent pieces of constructed handrail. When approved by the Engineer, intermediate post-to-rail connections may be made using internal pipe sleeve locks and Allen screw fasteners. Locking devices which do not produce flush, smooth, rigid, hairline joints will not be acceptable. Weld other connections. C. Welded Connections: Cope intersections of rails and posts, weld joints and grind smooth. Butt weld end-to-end joints or railings or use welding connections, at fabricator's option. HANDRAILS AND RAILINGS /1 K:\ StateO!M0\029 DesginNECCSewerlmprovements\Misc\FINAL BID DOCUMENTS CD CONTENTS TO STATEIMS Word Specifications by Section\ Handrails & Railing- State Format.doc.

2 D. Weld comers and seams continuously and in accordance with the recommendations of A WS. Grind exposed welds smooth and flush, to match and blend with adjoining surfaces. Discoloration of finished surfaces will not be acceptable. E. Form exposed connections with flush, smooth, hairline joints, using concealed fasteners wherever possible. Use exposed fasteners of the type shown, or if not shown, use Phillips flathead (countersunk) screws or bolts. F. Provide for anchorage of the type shown, coordinated with the supporting structure. Fabricate and space anchoring devices as shown and as required to provide adequate support. G. Bracklets, Flanges and Anchors: Provide brackets, flanges and anchors for railing posts and for handrail supports. Furnish inserts and sleeves as required for anchorage to concrete or masonry work. 3.2 INSTALLATION 1. Furnish cast metalh'ackets, flanges and exposed anchors of the same material and finish as supported rails, unless otherwise indicated A. Fastening To In-Place Construction: 1. Provide anchorage devices and fasteners where necessary for securing handrails and railing items to in-place construction; including, threaded fasteners for concrete and masonry inserts, toggle bolts, through-bolts, lag bolts and other connectors as required. 2. Use railing manufacturer's standard methods of installation when acceptable to Engineer. 3. Provide removable railing sections as indicated Furnish slip-fit metal socket or sleeve for casting into concrete. Accurately locate sleeves to match post spacings. B. Cutting, Fitting and Placement: END OF SECTION Perform cutting, drilling and fitting required for installation Set the work accurately in location, alignment, and elevation, plumb and level, true and free of rack, measured from established lines and levels. 2. Fit exposed connections accurately together to form tigli hairline joints. Weld connections which are not to be left as exposed joints, but cannot be shop-welded because of shipping size limitations. Grind joints smooth and touch-up shop paint coat. Do not weld, cut or abrade the surfaces of units which have been coated or finished after fabrication, and are intended for field connections. 3. Adjust railings prior to securing in place to ensure proper matching at butting joints and correct alignment throughout their length. Space posts not more than 4 feet on centers, unless otherwise shown. Plumb posts in each direction Secure posts and rail ends to building construction as follows: 4. Anchor posts in concrete as indicated on plans. 5. Provide concealed sleeve expansion joints at twenty (20) foot centers. HANDRAILS AND RAILINGS /2 K:\200\248 StateO!M0\029 DesginNECCSewerlmprovements\Misc\FINAL BID DOCUMENTS CD CONTENTS TO STATE\MS Word Specifications by Section\ Handrails & Railing- State Fonnat.doc

3 SECTION GRATING PART 1 - GENERAL 1.1 DESCRIPTION A. The extent of the grating work is shown on the drawings and includes grating which is not a part of other metal systems in other sections of these specifications. B. Submittals: PART 2- PRODUCTS 1. The Contractor shall submit complete detailed shop drawings for all grating to the Engineer for approval in accordance with applicable requirements ofdivision 1. Shop drawings shall include the following information: a. Panel sizes and locations. b. Dimensions and placement of grating framework. c. Openings and cut-outs for piping and equipment. d. Special fabrication at openings and cut-outs. e. Anchorage types and spacing. f. Framework sizes, types and dimensions for fabrication 2. Sample: Contractor shall submit Ol).e (1) sample of each ofthe following items (if requested): a. Grating panel including banding, minimum size 12" x 12". b. Grating framework surrounding panel sample. c. Anchoring devices. 3. Product Data: Contractor shall submit product data describing grating system proposed. 2.1 ACCEPTABLE ALUMINUM GRATING AND TREAD SYSTEMS A. Extruded Plank Type: 1. Extruded plank type design consisting of 6" wide planks of extruded aluminum, welded to each other to form panels. 2. Grating shall be as manufactured by Washington Aluminum Co., Inc., Baltimore, Maryland; McNichols Co., Cleveland, Ohio; or approved equal. B. Aluminum "I" Bar Type: 1. Fabricated from extruded "I" shaped aluminum sections with continuous perpendicular cross bars perpendicular to bearing "I" bars. 2. Grating of this type shall be: a. b. "I-Lok" grating as manufactured by Reliance Steel Products Co., McKeesport, Pennsylvania. "Ram Grate "I" Bar Grating" as manufactured by Russo Architectural Metals, Inc., Twinsburg, Ohio. GRATING K:\200\248 StoteOfM0\029 DesginNECCSewerlmprovemeots\Misc\FINAL BID DOCUMENTS CD CONTENTS TO STATEIMS Word Speeificatioos by Sectioo\ Grating (Alum.) State Format.doc

4 2.2 QUALITY ASSURANCE c. Or approved equal. A. All grating shall be of the same type and of the same manufacturer for the entire project. B. Grating shall be fabricated in accordance with the details as shown on the drawings and shall be designed for a live load of not less than 100 pounds per square foot, with deflection not exceeding 1/360 of the span. 2.3 STOCK A. Materials - Extruded Plank Type: 1. Grating shall be extruded of aluminum AS1M B 221, Alloy 6063-T6. 2. Banding shall be extruded of aluminum ASTM B 221, Alloy 6063-T6. 3. Framing shall be of extruded aluminum AS1M B 221, Alloy 6061 or B. Materials- "I" Bar Type: 1. Bearing "I" bars shall be extruded ofaluminumastm B 221, Alloy 6061-T6. 2. Cross bars shall be extruded of aluminum ASTM B 221, Alloy 6063-Tl. 3. Framing shall be of extruded aluminum ASTM B 221, Alloy 6061 or C. Fabrication- Extruded Plank Type: 1. Consist of 6" wide planks of extruded aluminum welded to each other to form panels. 2. Panels shall be banded with an extruded aluminum end bar welded in place. 3. Grating shall be heavy duty type with integral"!" bars at 1.2" center to center. 4. Furnish with square upset punch pattern D. Fabrication- "I" Bar Type: 1. "I" shaped bearing bars shall be spaced not more than 1-3/16" center to center. 2. Cross bars shall be perpendicular to the bearing bars and secured to the bearing bars by welding or mechanical locking device. 3. Cross bars shall be continuous through width of each panel and not more than 4" center to center. 4. Surface of "I" bearing bars shall be grooved longitudinally. 5. Panels shall be constructed with a 3/16" thick extruded aluminum bar welded to the ends of the bearing bars. E. Fabrication- General: GRATING K:\200\248 StateOfM0\029 DesginNECCSewerlmprovements\Misc\FINALBID DOCUMENTS CD CONTENTS TO STATE\MS Word Specifications by Section\ Grating (Alum.) State Format.doc

5 1. Grating shall be fabricated in accordance with details shown on the drawings. 2. The floor grating shall be accurately fabricated free from warps, twists or other defects which effect the appearance and serviceability of the grating. 3. Where holes are required for passage of pipes, or other purposes, they shall be provided and the grating shall be reinforced where necessary to preserve its strength. All these cutouts shall be banded to the full depth of the grating and welded at each bearing bar. 4. Use materials oftle size and thickness shown, or if not shown, of the sizerecommetrled by product manufacturer. Work to the dimension shown or accepted on final shop drawings, using proven details of fabrication and support. Use the type of materials shown or specified for the various components of the work. 5. Coordinate fabrication of grating with structural steel, equipment and mechanical fabrication as required. 6. Perform fabrication work complete, detailed including openings and cut-outs in a manner to minimize the necessity of field cut openings, cut-outs and banding of panels. F. Frames: Frames shall be required for embedment in concrete and shall be as follows: 1. Extruded of aluminum angle shapes. 2. Shall be designed with a fastener recess to permit securing the grating at any point without requiring the chipping of the concrete. 3. Frame shall be of the proper depth for the grating installation 4. Frame extruded aluminum shape shall have a continuous "T" shape anchor, for secure anchorage to cast-in-place concrete. 5. The continuous anchor shall have a 2" long notch every 18" to insure full penetration of concrete. 6. All frame surfaces in contact with concrete shall be given one (1) shop coat of zinc chromate primer. G. Fasteners: PART 3- EXECUTION 3.1 GENERAL 1. Fastening shall be accomplished by use of an aluminum plate between the bearing bars and tightening by means of a stainless steel bolt against the lower flange of bearing "I" bars. 2. Fasteners shall be hidden giving a smooth surface with no protrusions. A. Install frames to be embedded in concrete securely fastened to the formworkand properly braced and anchored. Set frames accurately in location, alignment and elevation, plumb, level, true and free of rack. B. GRATING Grating shall be set with a full and uniform bearing on the structural supports to preclude rocking movement. Wedges or similar shimming devices shall not be used K:\200\248 StateOIM0\029 DesginNECCSewerlmprovements\Misc\FINAL BID DOCUMENTS CD CONTENTS TO STATE\MS Word Specifications by Section\ Grating (Alum.) State Format.doc

6 C. Fit exposed connections accurately together to form tight hairline joints. D. Weld non-removable units to supporting members or framework. Secure removable units to supporting members or framework with fasteners. E. Perform all cuting, drilling and fitting required for installation Set the work accurately in location, alignment and elevation, plumb, level, true and free of rack. F. Wherever bar gratings are pierced by pipes, ducts, and structural members, cut openings neatly and accurately to size and weld a strap collar not less than 1/8" thick to the cut ends ofthe bars. G. Divide the panels into sections only to the extent required for installation wherever bar grating platforms, runways, etc., are to be placed around previously installed pipe, ducts, and structural members. END OF SECTION GRATING K:\200\248 StateOlM0\029 DesginNECCSewerlmprovements\Misc\FINAL BID DOCUMENTS CD CONTENTS TO STATE\MS Word Specifications by Section\ Grating (Alum.)- State Format.doc