MATERIAL SPECIFICATIONS

Transcription

1 FENCING CHAIN LINK FENCE AND GATE(S) A. SCOPE MATERIAL SPECIFICATIONS This section covers the work necessary for the chain link fence gate(s), complete. General Like items of materials provided hereunder shall be the end product(s) of one manufacturer in order to achieve standardization for appearance, maintenance, and replacement. Submittals During Construction Submittals during construction shall be made in accordance with Section Detailed Specifications - General. In addition, the following specific information shall be provided: Shop Drawings Submit shop drawings and installation drawings for the Engineer's review prior to fabrication and delivery. These drawings shall provide detailed information and specifications for all materials, finishes, dimensions, and erection instructions. Samples Prior to fabrication and delivery, submit to the Engineer for approval, samples (approximately 6 inches square or 6 inches long) of posts, rails, braces, fabric, wire, ties, fittings, etc. Approved samples of fittings may be used in the work when no longer needed by the Engineer for inspection and comparison purposes. Reference Standards Specification of Metallic-Coated Steel Chain Link Fence Fabric, published by Chain Link Fence Manufacturers Institute, Washington, DC B. MATERIALS General The use of a manufacturer's name and model or catalog number is for the purpose of establishing the standard of quality and general configuration desired only. Products of other manufacturers will be considered in accordance with the GENERAL CONDITIONS.

2 FENCING - 2 Materials shall be new and products of recognized, reputable manufacturers. Used, rerolled or re-galvanized materials are not acceptable. All materials shall be hot-dip galvanized after fabrication. Posts and other appurtenances shall have a minimum zinc coating of 1.2 ounces per square foot of surface. Aluminum-coated fabric and wire may be substituted for the galvanized fabric and wire. Aluminum coating shall be not less than 0.40 ounce per square foot, complying with ASTM A 491, Class II. Fabric Chain link fence fabric, height as shown on the Contract Drawings, woven of No. 9- gauge wire in 2-inch diamond-mesh pattern, selvages twisted and barbed, galvanized after weaving with 1.2-ounce zinc coating conforming to ASTM A 392. Posts Federal Specification PR-F-191, fence, posts, gates, and accessories, except as hereinafter modified. Standard lengths for setting in ground or in concrete as required for conditions shown. Line Posts For fences up to 8'-0" high, use galvanized H-columns, 2-inch by 2-¼-inch, weight 4.1 pounds per linear foot; or 2-½-inch outside diameter, Schedule 40 steel pipe, weight 3.65 pounds per linear foot; or C-section roll-formed from steel conforming to ASTM A 570, Grade 45, inches by inches. For fences over 8'-0" high, follow manufacturer's recommendations for sizes. End, Corner, Angle and Pull Posts For end, corner, angle, and pull posts, use inch outside diameter standard weight steel pipe, weight 5.79 pounds per linear foot; or 3.5-inch by 3.5-inch rollformed section with minimum bending strength of 486 pounds under a 6-foot cantilever load. Gate Posts For single swing gates up to 6 feet wide, inch outside diameter, 5.79 pounds per foot. For single gates 6 feet wide to 13 feet wide, 4-inch outside diameter, 9.1 pounds per foot. For other sizes, follow manufacturer's recommendations.

3 FENCING - 3 Post Tops Post tops shall be pressed steel or malleable iron, designed as a weather-tight closure cap for tubular posts. Provide one cap for each post, unless equal protection is afforded by combination post top cap and barbed wire supporting arm where barbed wire is required. Where top rail is used, provide tops to permit passage of top rail. Tension Wire Tension wire shall be zinc - or aluminum-coated coil spring steel wire not less than No. 7- gauge, (0.177 inch in diameter). Provide the clips of manufacturer's standard as approved for attaching the wire to the fabric, at intervals not exceeding 24 inches. Stretcher Bars Stretcher bars shall be one-piece lengths equal to full height of fabric with a minimum cross-section of 3/16 inch by 3/4 inch. Provide one stretcher bar for each gate and end post and two for each corner and pull post. Stretcher Bar Bands Bar bands shall be heavy-pressed steel, spaced not over 15 inches on center to secure stretcher bars to tubular end, corner, pull, and gate posts. Top Rail Not less than 18-foot long tubular steel, 1 5/8 inch outside diameter, weight 2.27 pounds per linear foot. Couplings to be outside-sleeve type and at least 6 inches long. Provide springs at one coupling in five to permit expansion in rail as recommended by the manufacturer. Top rail to extend through line post tops to form continuous brace from end-to-end of each stretch of fence. Braces Brace pipe shall be of the same material as the top rail and shall be installed midway between the top rail and extend from the terminal post to the first adjacent line post. Braces shall be securely fastened to the posts by heavypressed steel and malleable fittings, then securely trussed from line post to base of terminal post with a 3/8 inch truss rod and tightener. Gates Gates shall be swing or sliding as indicated, complete with latches, stops, keepers, hinges, or rollers and roller tracks.

4 FENCING - 4 Gate frames shall be constructed of tubular members welded at all corners or assembled with fittings. On steel, welds shall be painted with zinc-based paint. Where corner fittings are used, gates shall have truss rods of 5/16-inch minimum nominal diameter to prevent sag or twist. Gate leaves shall have vertical intermediate bracing as required spaced so that no members are more than 8 feet apart. Gate leaves 10 feet or over shall have a horizontal brace or one 5/16-inch minimum diagonal truss rod. When fence has barbed wire top, the end members of the gate frames shall be extended 1 foot above the top horizontal member to which three strands of barbed wire, uniformly spaced, shall be attached by use of bands, clips, or hook bolts. Fabricate frames of standard weight pipe 1.90-inch outside diameter, weight 2.72 pounds per linear foot. Gate fabric shall be the same type as used in the fence construction. The fabric shall be attached securely to the gate frame at intervals not exceeding 15 inches. Gate hinges shall be of adequate strength for gate and with large bearing surfaces for clamping in position. The hinges shall not twist or turn under the action of the gate. The gates shall be capable of being opened and closed easily by one person. Gate latches, stops, and keepers shall be provided for all gates. Latches shall have a plunger-bar arranged to engage the center stop, except that for single gates of openings less than 10 feet wide a forked latch may be provided. Latches shall be arranged for locking with padlocks. Center stops shall consist of a device arranged to be set in concrete and to engage a plunger-bar of the latch of double gates. No stop is required for single gates. Keepers shall consist of a mechanical device for securing the free end of the gate when in the full open position. Keeper Provide keeper for all vehicle gates, which automatically engages the gate leaf and holds it in the OPEN position until manually released. Removable Fence Panels Removable fence panels shall be provided as indicated on the Drawings. The total length of any removable fence section shall be divided into equal removable fence panels with panel length not to exceed 10 feet. The posts on either side of removable fence panels shall be hot-dip galvanized pipe, 3-inch OD, 5.79 pounds per linear foot. Concrete Material(s) as specified on Contract Documents Section 1, Detailed Specifications - concrete shall be utilized.

5 FENCING - 5 C. WORKMANSHIP Installation Installation of fencing shall meet the requirements of ASTM F 567. Erect fencing in straight lines between angle points by skilled mechanics experienced in this type of construction. Erect in accordance with the manufacturer's recommendations as approved and with these Specifications. Post holes shall be a minimum depth of 3 feet below finished grade. Holes for line posts shall be 9 inches in diameter. Holes for gate, corner, and pull posts shall be 16 inches in diameter. Space posts not more than 10 feet on centers and in true lines. Set posts plumb and to a depth of 2 feet 10 inches. The top rail of the fence shall be at the top of the fabric. Fill remainder of hole with concrete to extend around the posts to a point 2 inches above finished grade. The top surface shall have a crown watershed finish. After concrete has set, install accessories. Fasten chain link fabric to end posts with stretcher bars and clamps and to line posts and top rail with wire or bands at approximately 14-inch centers and 24-inch centers, respectively. Install three strands of barbed wire on the brackets, tighten, and secure at each bracket. Brace gate posts diagonally to adjacent line posts to ensure stability. Hang gates and adjust all hardware so that gates operate satisfactorily from open or closed position. Removal and Resetting of Existing Fence All accessories shall be removed carefully and all materials stored in a safe place until required for resetting. The Contractor shall provide all new material necessary to replace lost or damaged material and as required for a complete and satisfactory installation. In general, the salvaged fencing shall be reinstalled as specified for new material. All concrete shall be removed from posts before they are reset. The Contractor may furnish all new materials, rather than salvage and reuse the existing fence. Cleanup Upon completion of the fence installation, clean up all waste material resulting from the operation.