SECTION CHAIN LINK FENCING

Transcription

1 SECTION CHAIN LINK FENCING PART 1 - GENERAL 1.01 SECTION INCLUDES A. The Work specified in this Section consists of furnishing and installing permanent chain link fences and gates in accordance with the details and at the locations indicated RELATED SECTIONS A. Section : Submittal Procedures B. Section : Project Quality Program Requirements - Design/Build or Section : Project Quality Program Requirements - Design/Bid/Build (as applicable) C. Section : Portland Cement Concrete D. Section : Grounding and Bonding E. Section : Earthwork 1.03 REFERENCES A. American Society for Testing and Materials (ASTM): 1. ASTM A53 Pipe, Steel, Black and Hot-Dipped, Zinc-CoatedWelded and Seamless 2. ASTM A153 Zinc Coating (Hot-Dip) on Iron and Steel Hardware 3. ASTM A239 Locating the Thinnest Spot in a Zinc (Galvanized)Coating on Iron or Steel Articles by the Preece Test (Copper Sulfate Dip) 4. ASTM A392 Zinc-Coated Steel Chain-Link Fence Fabric B. Federal Specifications (FS): 1. FS FF-P-101 Padlocks 2. FS RR-F-191/1 Fencing, Wire and Post, Metal (Chain-Link Fence Fabric) (Detail Specification) 3. FS RR-F-221/1 Fencing Wire (Barbed Wire) (Detail Specification) 4. FS TT-W-572 Wood Preservative: Water-Repellent Chain Link Fencing Baseline: 07/11/12

2 1.04 QUALITY ASSURANCE A. Comply with Project Quality Program Requirements (see 1.02 above). B. Provide fencing and gates manufactured in accordance with Standard Specifications for Public Works Construction (SSPWC). C. Use an installer of Chain Link Fencing materials who has at least three years past projects experience in this type Work SUBMITTALS A. Refer to Section , Submittals Procedures, for submittal requirements and procedures. B. Manufacturers' product data. C. Test reports. D. List of five projects completed by the proposed installer in past three years those are compatible with the proposed Work DEFINITIONS (Not Used) 1.07 WORKSITE CONDITIONS A. Existing Fences: Repair fences which are to remain in place, and which have been damaged by Work of this Section, at no additional cost to Metro. Where new Chain Link Fence is to abut an existing chain link fence, the existing posts may be used if they are the proper height and size. Provide bracing for end and corner posts. B. Remove and dispose of earth, trees, brush and other obstructions which interfere with the construction of fences. Finish grade to minimize or eliminate undulation in the profile of the fence. C. Install fence posts to avoid conflict with right-of-way monuments set by Metro. Before setting fence posts, confer with Metro or its designee regarding the locations of right-ofway monuments DELIVERY, STORAGE, AND HANDLING A. Refer to Section Product Storage and Handling Requirements, for general requirements for product delivery, storage, and handling procedures. B. Deliver materials to the site packaged, bearing manufacturer's labels firmly affixed to material. C. Remove unlabeled items and items delivered in damaged condition from the site. Chain Link Fencing Baseline: 07/11/12

3 PART 2 - PRODUCTS 2.01 GALVANIZED FERROUS FENCE MATERIALS A. Do not use imperfectly galvanized material and material upon which serious abrasions of the galvanizing occur. Provide items of each particular type, such as posts, extension arms, fabric and accessories, of the same manufacture, size, design, castings and materials, and otherwise identical with like items. B. Provide posts, rails and braces of either pipe or rolled formed H Sections. Pipe conforming to ASTM A53, Schedule 40. Hot-dip galvanized coatings not less than 2.0 ounces of zinc per square foot. The hydrostatic test required by ASTM A53 will be waived. PART End, Corner and Pull Posts Line Posts, pounds/foot Post braces, 2.27 pounds/foot FENCE PIPE O.D. 2 1/2 inches, 5.79 pounds/foot 2.0 inches, 2.70 pounds/foot 1.66 inches, 1.35 pounds/foot H SECTION SIZE AND WEIGHT 3 1/2 inches, 5.4 pounds/foot 1 7/8 inches 1 5/8 inches 1. Provide gate posts the full height of the fabric as indicated. 2. Provide posts with tops designed to fit securely over the posts, to exclude water, and to bear the top pipe rail and extension arms, where indicated. 3. Provide total length of posts to be set in the ground equal to the length of the portion embedded in the concrete footing plus the length required above ground. Provide posts to be mounted on top of concrete retaining and barrier walls with a total length of not less than three feet eight inches, unless indicated otherwise. Provide pipe sleeves for fence posts to be set in concrete. 4. Consider changes in line, where the angle of change is 30 degrees or more, such as corners, and install corner posts. C. Provide post tops, extension arms, stretcher bars and other fittings and hardware of steel, malleable iron or wrought iron, galvanized in accordance with ASTM A153. Provide fittings and hardware to fasten to the posts and concrete in the proper manner. Provide extension arms designed to bear, and to anchor securely, three strands of barbed wire equally spaced and having adequate strength to support a vertical load of 150 pounds at the outer end. Provide extension arms of the dimensions to carry the barbed wire to the height scheduled above the ground or concrete wall. Angle extensions arms extending inward, outward or vertically, as indicated; if not indicated, extend the arms inward. D. Provide fabric conforming to ASTM A392, of the width indicated. Provide fabric with a galvanized coating that can pass 12 one minute immersions in accordance with ASTM A239 without failure. Provide nine gauge wire in the manufacture of the fabric. Weave the chain link fence fabric into approximately two inch mesh in such manner that no Chain Link Fencing Baseline: 07/11/12

4 fewer than seven meshes occur in a vertical dimension of 23 inches along the diagonals of the openings. Twist and barb chain link fence fabric on top and bottom edges, unless indicated otherwise. Where redwood pickets are indicated, provide 3 1/2 inch by 5 1/2 inch mesh. 1. Provide vinyl clad fabric where indicated, of polyvinyl chloride thermally bonded to galvanized wire, conforming to FS RR-F-191/1, Type IV. Provide vinyl of a uniform 0.02 inch thick. 2. Where indicated provide redwood pickets in the fabric of Grade A, or better, rough redwood installed vertically the full width of the fabric. Knuckle the top and bottom selvages. Give the redwood pickets a factory- applied preservative stain conforming to FS TT-W PROVIDE ACCESSORIES A. Fasten chain link fabric bottom to a tension wire. Provide tension wire not lighter than seven gauge galvanized steel, spiraled or crimped spring wire. Galvanized finish same as fabric. B. Galvanized steel or noncorrosive metal bands, if accepted by Metro or its designee, will be permitted in lieu of tie wires for fastening chain link fabric to posts and gate frames. C. Provide gates of the widths indicated, constructed of galvanized Schedule 40 pipe conforming to ASTM A53 or of two inch square galvanized steel tubing. Provide crosstrussed gate frames with 3/8 inch adjustable truss rods. Fasten the corners of the gate frames together and reinforce with a galvanized malleable iron fitting designed for the purpose, or weld. Perform welding in accordance Section 05120, Structural Steel, and grind welds smooth. Ensure galvanized finish not less than 1.8 ounces per square foot complying with ASTM A53. Attach chain link fence fabric to the gate frame with stretcher bars and tie wires as specified for the fence construction, and provide suitable tension connections spaced at approximately one foot intervals. 1. Hang the gates by two or more galvanized steel or malleable iron hinges, not narrower than three inches, which have been designed to clamp securely to the gate post and permit the gate to be swung back against the fence. Provide the bottom hinge with a socket to receive the ball end of the gate frame. Design and arrange the gate hinges to prevent removal of the gate from the hinges. 2. Provide gates having a galvanized steel or malleable iron combination catch of acceptable design. Provide stop to hold gates open, and a center rest with catch. Lock by padlock and chains, operable from each side of the fence. 3. Install extension arms on the end posts to carry strands of barbed wire in horizontal alignment with the strands of barbed wire on the adjacent fence. 4. Gates: Out swing type complete with latches, plunger bar, stops, keepers and hinges. Construct gate frames of tubular members fabricated and assembled to avoid sag and misalignment. Provide adequate bracing. Use adequate strength hinges with large bearing surfaces for clamping into position and preventing twisting or turning under action of gate. Provide gates capable of being opened and closed easily by one person. Provide with locking latches and a plunger-bar arranged to engage the center stop. Use center stops consisting of a device arranged to be set in concrete and to engage a plunger bar of the latch. Use keeper consisting of a Chain Link Fencing Baseline: 07/11/12

5 mechanical device for securing the free end of the gate when in the full open position. D. Provide barbed wire conforming to FS RR-F-221/1, Type A, Class 2, galvanized, two twisted strands of 12 1/2 gauge wire with four-point, 14 gauge round barbs spaced on not more than five-inch centers. Provide three strands of barbed wire, equally spaced on extension arms. E. Provide padlocks conforming to FS FF-P-101, Type EPC, two inch size, solid brass case, with chain. Provide one padlock with chain for each gate. Key padlocks alike and master-key to the Metro Rail System locks as required by Metro or its designee PROVIDE CONCRETE A. Conform to the requirements of Section Portland Cement Concrete, with Class 2500 concrete used for footings, and Class 3000 concrete used for other Work GROUNDING SYSTEM A. Grounding equipment shall be as indicated and in accordance with the requirements of Section Grounding and Bonding. PART 3 - EXECUTION 3.01 SPACE LINE POSTS A. Space line posts on not more than ten foot centers. In determining the post spacing, make measurement parallel to the slope of the natural ground, with posts placed in a vertical position except in unusual locations where, in the opinion of Metro or its designee, it would be more satisfactory to place the posts perpendicular to the slope of the ground. Except as otherwise indicated, where fencing is installed on the top of concrete walls, sleeve and grout the posts or embed in asphalt as detailed. Install posts on galvanized steel base plates where indicated PROVIDE FOOTINGS A. Set posts in accordance with SSPWC, Section B. Crown footings to a height of approximately two inches above grade. The crown shall be an integral part of the footing. C. Install line posts true and plumb, spaced equally on centers not to exceed ten feet. D. Install a corner or pull post when there is a change of 30 degrees or more either in direction or in grade. E. Attach fabric to posts using a 3/16 inch by 3/4 inch stretcher bar, 11 gauge by one inch tension and brace bands, and 3/8 inch diameter carriage bolts. Place bands on approximately 16 inch centers. Chain Link Fencing Baseline: 07/11/12

6 F. Install fabric and top and bottom tension wires with sufficient tension that no sagging or buckling will result. Place the fabric on the side of the post away from the area being enclosed, unless directed otherwise by Metro or its designee. G. Maintain a maximum clearance between fence and ground line as indicated BRACE END, CORNER AND GATE POSTS A. Brace end, corner and gate posts to the nearest line post, with galvanized diagonal or horizontal braces used as compression members, and with galvanized 3/8 inch diameter steel truss rods with turnbuckles used as tension members. Brace line posts horizontally and truss in both directions as specified above, at the indicated intervals FASTEN FABRIC A. Fasten Fabric to the outer face of the posts except that, where a property owner's existing fencing occurs directly against and adjacent to the Metro Rail System fencing, fasten chain link fabric to the inner face of posts, if indicated. Stretch the fabric and securely fasten to the posts, rails, and top and bottom tension wire with either tie wires or metal bands. Provide tension wires of coiled or spiraled type, not longer than 500 feet. Install tension wires from braced line posts to braced line posts. Install the bottom tension wire on a straight grade between posts by excavating the high points of ground. In no case will filling of depressions be permitted. Fasten the fabric to end, corner and gate posts as indicated. Space the fasteners as indicated. Place the bottom tension wire as indicated SURFACE TREATMENT AT GATES A. Pave the ground surface for the full width of the gate, and for a distance of three feet on both sides of the gate. Provide asphaltic concrete or Class 2500 Portland Cement Concrete paving to the dimensions indicated. Provide paving not further than two inches below the bottom of the gate, and slope to drain away from the gate on both sides INSTALL WARNING SIGNS A. Install on the fence as indicated. Do not place manufacturers or other signs on the fence REPAIR VINYL COATING A. Repair vinyl coating in accordance with the coating manufacturer's instructions. If coating is damaged during the period of this Contract, repair at no additional cost to Metro GROUNDING A. Grounding shall be installed as indicated and in accordance with the requirements of Section Grounding and Bonding ADJUSTMENT AND CLEANING Chain Link Fencing Baseline: 07/11/12

7 A. Adjust brace rails and tension rods for rigid installation. B. Tighten hardware, fasteners and accessories. C. Remove excess and waste materials from the site. END OF SECTION Chain Link Fencing Baseline: 07/11/12