Attachment_8_-_HMFS_Supplemental_Specifications_0001.pdf

SECTION 02821 – CHAIN LINK FENCES AND GATES

PART 1 GENERAL

1.1 SECTION INCLUDES

A. Furnishing and installing chain link security fences and relocating existing chain link security fence.

1.2 SUBMITTALS

A. Shop Drawings: Submit shop drawings for fences and each gate to be used on this project showing details of post installation, extension arms, gate swing, hardware and accessories.

1.3 QUALITY ASSURANCE

A. Single-Source Supplier: Obtain chain link fences and gates, including accessories, fittings, and fastenings, from a single source.

1.4 DELIVERY, STORAGE, AND HANDLING

A. Requirements: Deliver materials to site in an undamaged condition.

Store materials off the ground to provide protection against oxidation caused by ground contact.

PART 2 PRODUCTS 2.1 FENCE FABRIC

A. Steel Fabric: Fabricated in one-piece widths for fencing 12 foot and less in height and with requirements indicated below: 1. Mesh and Wire Size: 2-inch mesh, 0.120-inch diameter wire.

B. Selvage: Knuckled at the top and twisted at the bottom.

2.2 FENCE FRAMEWORK

A. Rails: Manufacturer's longest lengths, minimum of 17 ft, with swedged-end or expansion-type coupling, approximately 6 inches long for joining. Provide rail ends or other means for attaching top rail securely to each gate post and fence post. Rails must not rotate.

2.3 BARBED MATERIAL

A. Barbed Wire Supporting Arms: Manufacturer's standard barbed wire supporting arms conforming to ASTM F 626, metal and finish to match fence framework, with provision for anchorage to posts and attaching three rows of barbed wire to each arm. Supporting arms may be either attached to posts or integral with post top weather cap and must be capable of withstanding 250 pounds downward pull at outermost end.

Provide following type: 1. Single vertical arm for three strands of barbed wire, one for each post.

B. Steel Barbed Wire: Three-strand, 0.099-inch diameter 12-1/2 gauge steel wire with 0.080-inch diameter 14-gauge, four-point barbs spaced not more than 5 inches apart; metallic-coated finish to match fabric.

1. Galvanized Finish: Comply with ASTM A 121, chain link fence grade with Class 3 zinc coating with not less than 0.8 oz/ft2 as determined by

ASTM A 90.

2.4 FITTINGS AND ACCESSORIES

A. Material: Fabricate from pressed steel or cast iron, and hot-dip galvanized with a minimum of 1.2 oz/ft2 of zinc coating of surface area.

Tie wires, clips, and hog rings shall withstand forming and twisting operations without cracking or flaking of the coating.

B. Post Brace Assembly: Use material specified below for bracing.

Provide manufacturer's standard galvanized-steel or cast-iron cap for each pipe or tube end.

1. Truss Rod: 3/8-inch diameter rod and adjustable tightener capable of withstanding a tension of 2000 lb.

2. Round Pipe: as shown on the drawings.

3. Roll-Formed Steel: 1-1/4 by 1-5/8-inch C section weighing a minimum of 1.40 lb/ft.

C. Tension or Stretcher Bars: Hot-dip galvanized steel with a minimum length of 2 inches less than the full height of fabric, a minimum cross section of 3/16 by 3/4 inch, and a zinc coating of 1.2 oz/ft2 minimum.

Provide one bar for each gate and end post, and two for each corner and pull post, except where fabric is integrally woven into the post.

D. Steel Bottom Tension Wire: 0.177-inch diameter metallic-coated steel marcelled tension wire conforming to ASTM A 824 with finish and coating to match fabric.

E. Hog Rings: Shall be 12-gauge steel wire with a minimum of 0.8 oz/ft2 of zinc coating in accordance with ASTM A 641 Class 3 or A coating.

F. Tie Wires: Provide tie wire constructed of the same material as the fencing fabric. 1. Steel: 0.106-inch diameter 12-gauge galvanized steel with a minimum zinc coating of 0.80 oz/ft2 according to ASTM A 641, Class 3 to match fabric.

2.5 CONCRETE

A. Ready-Mixed: ASTM C 94, using 3/4 inch maximum size aggregate, and having a minimum compressive strength of 3500 psi at 28 days. Slump shall be 4 inches as determined by ASTM C 143. One part portland cement to three parts clean, well-graded sand and gravel and the minimum amount of water to produce a workable mix.

2.6 FENCE GROUNDING

A. Conductors: Bare, solid wire for No. 6 AWG and smaller;

stranded wire for No. 4 AWG and larger.

1. Material above Finished Grade: Copper.

2. Material on or below Finished Grade: Copper.

3. Bonding Jumpers: Braided copper tape, 1 inch wide, woven of No. 30 AWG bare copper wire, terminated with copper ferrules.

B. Connectors and Grounding Rods: Comply with UL 467.

2.7 GROUNDING AND BONDING

A. Fences within 100 Feet of Buildings, Structures, Walkways, and Roadways: Ground at maximum intervals of 750 feet and at a minimum of each corner and gate.

1. Grounding Method: At each grounding location, drive a grounding rod vertically until the top is 6 inches below finished grade. Connect rod to fence with No. 6 AWG conductor. Connect conductor to each fence component at the grounding location.

B. Bonding Method for Gates: Connect bonding jumper between gate post and gate frame.

1 Connections: Make connections so possibility of galvanic action or electrolysis is minimized.

C. Bonding to Lightning Protection System: If fence terminates at lightning-protected building or structure, ground the fence and bond the fence grounding conductor to lightning protection down conductor or lightning protection grounding conductor complying with NFPA 780.

PART 3 EXECUTION

3.1 PREPARATION

A. Scheduling: Do not begin installation and erection before final grading is completed, unless otherwise permitted.

B. Clearing: Maximum clearing width is 4 ft on each side of the fence line. Clear with minimum disturbance to existing vegetation. Dispose of debris off site at contractors’ expense.

C. Excavation: Drill or hand-excavate holes using post-hole digger to diameters and spacings indicated, in firm, undisturbed or compacted soil.

1. Excavate holes for each post to minimum diameter as shown on the drawings.

2. Unless otherwise indicated, excavate hole depths approximately 3 inches lower than post bottom.

3.2 INSTALLATION

A. General: Construct and install fence to comply with ASTM F 567 and manufacturer's written instructions.

B. Alignment and Setting of Posts: Set posts plumb, and align posts in holes 3 inches above bottom of excavation. Space a maximum of 10 feet center to center, unless otherwise staked or indicated on the drawings, to the grades indicated. Locate a terminal post at each change in horizontal or vertical direction of 30 degrees or more. Protect the portion of posts above ground from concrete splatter. Place concrete around posts and vibrate or tamp for consolidation. Extend concrete 2 inches above grade and trowel to a crown to shed water. Check each post for vertical, horizontal and top alignment, and hold in position during placement and finishing operations.

C. Terminal Post Bracing:

1. Securely fasten diagonal braces to the terminal post and the adjacent line post or its footing or a footing of equal size.

There shall be no more than a 50 degree angle between the brace and the ground. Securely fasten horizontal braces with truss rods to the adjacent line post and terminal posts.

2. When the top rail is used, attach the brace at the halfway point of the terminal post above grade and, when the top rail is omitted, at the two-thirds point above grade.

D. Top Rail and Tension Wire:

1. Support the top rail at each post so that a continuous brace from end to end of each stretch of fence is formed. Securely fasten the top rail to the terminal posts and join with sleeves or coupling to allow for expansion and contraction.

E. Fabric:

1. Place chain-link fabric on the outside of the area enclosed.

2. Place the fabric by securing one end, applying sufficient tension to remove slack before making attachment elsewhere.

Tighten the fabric to provide a smooth uniform appearance free from sag.

3. Cut the fabric by untwisting a picket and attach each span independently at terminal posts. Use stretcher bars with tension bands at maximum 15 inch intervals or other approved method of attachment.

4. Install fence fabric 2 inch above ground level. Measure clearance at the post with a tolerance of plus or minus 3 inches.

Fasten the fabric to the line posts at intervals not exceeding 15 inches. Fasten the fabric to the rail or tension wire at intervals not exceeding 24 inches.

5. Join rolls of wire fabric by weaving a single picket into the ends of the rolls to form a continuous mesh.

F. Tension or Stretcher Bars: Thread through fabric and secure to end, corner, pull, or gate posts with tension bands spaced not over 15 inches center to center.

G. Tie Wires: Use wire of proper length to secure fabric firmly to posts and rails. Bend ends of wire to minimize hazard to persons or clothing.

1. Maximum Spacing: Tie fabric to line posts 12 inches center to center and to rails and braces 24 inches center to center.

H. Barbed Wire: Extend end members of gate frames above top member of gate to match the height of adjacent fence and prepare to receive the same number of strands as adjacent arms of fence posts. Pull taut to remove sag, firmly install it in the slots of the extension arms and secure it. Provide necessary clips for securing wire to extensions.

Attach at maximum intervals of 8 ft.

I. Fasteners: Install nuts for tension bands and carriage bolts on the side

1. Cure Time: Allow concrete to cure a minimum of 72 hours before performing other work on posts.

of the fence opposite the fabric side. Peen ends of bolts or score threads to prevent removal of nuts.

END OF SECTION