Section_32_31_13_Chain_Link_Fence.docx

SECTION 32 31 13

SECTION 32 31 13

CHAIN LINK FENCING

PART 1 GENERAL

1.1 SECTION INCLUDES

A. Chain link fencing fabric, posts, braces, anchorage, gates, miscellaneous hardware and appurtenances.

1.2 REFERENCES

A. ASTM A 53: Standard Specification for Pipe, Steel, Black and Hot Dipped, Zinc-Coated, Welded and Seamless.

B. ASTM A 121: Standard Specification for Zinc Coated (Galvanized) Steel Barbed Wire.

C. ASTM A 392: Standard Specification for Zinc Coated Steel Chain Link Fence Fabric.

D. ASTM A 491: Standard Specification for Aluminum Coated Steel Chain Link Fence Fabric.

E. ASTM A 585: Standard Specifications for Aluminum Coated Steel Barbed Wire.

F. ASTM A 641: Standard specification for Zinc Coated (Galvanized) Carbon Steel Wire.

G. ASTM F 567: Standard Practice for Installation of Chain-Link Fence.

H. ASTM F 573: Standard Specification for Residential Zinc-Coated Steel Chain-Link Fence Fabric.

I. ASTM F 626: Standard Specification for Fence Fittings.

J. ASTM F 654: Standard Specification for Residential Chain-Link Fence Gates.

K. ASTM F 668: Standard Specification for Polyvinyl Chloride (PVE) Coated Steel Chain Link Fence Fabric.

L. CLFMI: Chain Link Fence Manufactures Institute Product Manual for Chain Link Fence Installation.

1.3 SUBMITTALS

A. Drawings: Indicate plan layout, grid size and spacing of components, accessories, fittings, anchorage, and post section.

B. Data: Submit manufacturer’s installation instructions and procedures, including details of fence and gate installation.

C. Submit sample of fence fabric and typical accessories.

A. Galvanizing: Class 3 per ASTM A 121.

B. Aluminizing: Class 2 per ASTM A 585.

C. Steel: Refer to ASTM A 53 requirements.

D. Concrete: Class 3000 minimum, per Section 03 30 04.

2.2 POSTS, CAPS, RAILS, COUPLINGS

A. Posts, Frames, Stiffeners, Rails:

Table 1 – Posts, Frames, Stiffeners, Rails

End, corner, slope and gate posts for single gates 6 feet or less in width and double gate 12 feet or less in width for:

1. Fence less than 72 inches high

2. Fence 72 inches or higher

2” pipe 2-1/2” pipe

Gate posts for single swing gates over 6 feet, but not over 13 feet in width and double swing gates over 12 feet, but not over 26 feet in width or for all slide gates with leaves larger than 6 feet.

3-1/2” pipe

Gate posts for single swing gates over 13 feet, but not over 18 ft in width and double swing gates over 26 feet, but not over 36 feet in width.

6” pipe

Bottom rail

6 gage, coiled spring steel tension wire

A. 9 gage steel wire fabric for all fences less.

1. Zinc coating per ASTM A 392 requirements.

2. Aluminum coating per ASTM A 491 requirements.

B. Unless indicated otherwise use chain link fabric that has approximately 2 inches square mesh and coated after fabrication.

C. Knuckle finish top edge and twist and barb bottom edge on fabric less than 60 inches wide. For fabric 60 inches in width twist and barb finish on both edges. Provide fabric that barbing has been done by cutting the wire on the bias.

D. If indicated, insert slats in fabric.

2.4 BARBED WIRE

A. Two strand, 12-1/2 gage wire with 14 gage, 4 point round barbs spaced approximately 5 inches on center.

2.5 TENSION WIRES AND FABRIC TIES

A. Tension wires: 7 gage galvanized coil spring steel wire per ASTM A 641 requirements.

B. Fabric Fasteners: 9 gage galvanized or 6 gage aluminum wire, or COR approved non-corrosive metal bands, for ties to fasten fabric to posts, rails, and gate frames. Fasten fabric to bottom tension wire spaced 24 inches on center.

2.6 TRUSS OR TENSION BARS

A. Galvanized steel rod 3/8-inch diameter for truss or tension bars used in trussing gate frames and line posts, provide adjustment by means of galvanized turnbuckles or other suitable tightening devices.

B. Tension Bars:

1. Galvanized high carbon steel bars not smaller than 3/16 inch x 3/4 inch for tension bars to fasten fabric to end and corner posts and gate frames. Provide 1 tension bar for each end post and 2 for each corner and pull post per section of fabric.

2. Use tension bar bands made from heavy pressed galvanized steel spaced on 15-inch centers to secure tension bars to posts.

2.7 FITTINGS AND HARDWARE

A. Unless indicated otherwise, galvanize fittings and hardware.

B. Rivets: Make all hardware attachments with galvanized steel rivets.

2.8 SUPPORT OR EXTENSION ARM

A. Use support or extension arms for barbed wire that are of a type that can be attached to the tops of the posts and carry the number of wires indicated.

B. Use only support arms on the fence for barbed wire that are capable of supporting a 250 vertical load at the end of the arm without causing permanent deflection.

C. Single support arms are to be integral with a top post weather cap and have a hole for passage of the top rail when required.

2.9 GATES

A. Provide additional horizontal and vertical members to ensure proper gate operation and for attachment of fabric, hardware and accessories.

B. Assemble gate frames and attach hardware by welding or by using fittings and rivets to make rigid connections. Use same fabric as for fence. Install fabric with stretcher bars to gate frame at not more than 15 inch on center.

C. Provide diagonal cross bracing consisting of 3/8 inch diameter adjustable length truss rods on gates where necessary to prevent frame from sagging or twisting.

2.10 GATE HARDWARE

A. Hinges: Pressed steel or malleable iron to suit gate size, non-lift off type, offset to permit 180 degree gate opening. Provide minimum of one pair of hinges for each leaf.

B. Latch: Forked steel type or plunger bar steel type to permit operation from either side of gate. Provide locking device and padlock eye as integral part of latch.

C. Keeper: Provide keeper for all vehicle gates that automatically engages the gate leaf and holds it in the open position until manually released.

D. Gate Stops: Mushroom type or flush plate with anchors set in concrete to engage the center drop rod or plunger bar.

E. Sliding Gates: Manufacturer’s standard heavy duty track, ball-bearing hanger sheaves, overhead framing and supports, guides, stays, bracing, steel wheel or rubber wheel, and accessories as required.

A. Coordinate utility location, Section 01 31 13.

B. Excavate per Section 31 23 16.

C. Refer to ASTM F 567 requirements and CLFMI products manual for chain link fence installation.

D. Protect existing trees.

E. Limit the amount of clearing and grading along the fence line to permit proper installation.

3.2 LAYOUT OF WORK

A. Accurately locate and stake locations and points necessary for installation of fence and gates.

B. General arrangements and location of fence and gates are indicated. Install except for minor changes required by unforeseen conflicts with work of other trades.

3.3 INSTALLATION OF POSTS

A. Space line posts as follows:

1. Tangent sections to 500 feet radius: 10 feet maximum

2. 200 feet radius to under 500 feet radius: 8 feet maximum

3. 100 feet radius to under 200 feet radius: 6 feet maximum

4. Under 100 feet radius: 5 feet maximum B. Provide pull posts at 500 feet maximum intervals. Changes in line of 30 degrees or more are considered corners.

C. Set all posts to true line and grade in concrete bases or in approved pipe sleeves or sockets. Check for vertical and horizontal alignment.

D. Construct concrete bases for posts at least 10 inches in diameter. Place a minimum of 6 inches of concrete below each post. Depth of post in concrete as follows.

1. Line Posts: 18 inches.

2. End, Pull, Corner and Gate Posts Less Than 6 Inches Diameter: 24 inches.

3. Gate Posts: 30 inches.

E. Where posts are required to be set in concrete walls or masonry, set sockets for the posts to a depth of at least 18 inches. Use sockets that consist of lengths of 0.048 inch galvanized metal pipe sleeves, with an inside diameter sufficient to allow the posts to fit loosely therein. Coat the inside of the socket and outside of the posts with an approved bituminous paint. Caulk the posts securely in place with lead wool.

3.4 INSTALLATION OF BRACE ASSEMBLIES

A. Attached brace rail from end, pull, corner or gateposts to first ensuing line post. Install braces so posts are plumb when diagonal truss rod is under proper tension.

3.5 INSTALLATION OF RAILS

A. Install rails level and plumb with grade between posts and attached to posts before stretching fabric. Top rails shall form continuous brace from end-to-end of each run of fence.

3.6 INSTALLATION OF FENCE FABRIC

A. Place fence fabric on security side of posts unless otherwise specified. Place fabric approximately 1 inch above the ground. Maintain a straight grade between posts by excavating high points of the ground. Filling depressions with soil will be permitted only upon approval of COR.

B. Stretch the fabric taut and securely fasten to posts. Fasten to end, gate, corner, and pull posts. Secure stretcher bars with metal bands spaced at 15-inch intervals. Cut the fabric and fasten each span independently at all pull and corner posts. Fasten to line posts with tie wire, metal bands, or other approved methods at 15-inch intervals. Attach the top edge of fabric to the top rail or tension cable at approximately 24-inch intervals. Attach bottom tension wire to fabric with tie wires at 24-inch intervals and secure to the end of pull posts with brace bands.

C. Draw barbed wire to assure minimum sag at high temperature and no breakage at low temperature. Connect the wires and arms by means of 0.142 gage galvanized wire stays.

A. Grind smooth and wire brush all welds made after galvanizing to remove loose or burned zinc coating, after which neatly coat the areas with 50-50 solder or as otherwise directed by COR. Make repairs to abraded or otherwise damaged zinc coating in a similar manner.

END OF SECTION

CHAIN LINK FENCING Page 1