5_APP_C_02821 Chain Link Fencing(Conc).pdf

Great Plains Area Indian Health Service Revised 04/2017

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SECTION 02821 – CHAIN LINK FENCING

PART 1 - GENERAL

1.1 SUMMARY

A. This section includes the furnishing and installation of a 6 foot chain link fabric fence with barbed wire and gates.

1.2 RELATED WORK

A. Section 02300 – Earthwork

B. Section 03100 - Concrete

1.3 REFERENCES

A. AASHTO M279 – Specification for Zinc-Coated (Galvanized) Steel Woven Wire Fence Fabric

B. ASTM A121 - 13 – Standard Specification for Metallic-Coated Carbon Steel Barbed

Wire

C. ASTM A123/A123M - 12 – Standard Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products

D. ASTM A392 - 11a – Standard Specification for Zinc-Coated Steel Chain-Link Fence

Fabric

E. ASTM A1011/A1011M - 12b – Standard Specification for Steel, Sheet and Strip, Hot- Rolled, Carbon, Structural, High-Strength Low-Alloy, High-Strength Low-Alloy with Improved Formability, and Ultra-High Strength

1.4 SUBMITTALS

A. Steel posts

B. Fence fabric

C. Smooth wire and fabric fasteners

D. Barbed wire

E. Braces

F. Vehicle gate

G. Person gate

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PART 2 - PRODUCTS

2.1 STEEL POSTS

A. Product of a manufacturer specializing in fence products.

B. Conform to ASTM F1043 Group IC, ASTM A123, and ASTM A1011.

C. Line Posts.

1. SS40 galvanized steel tubing.

2. Minimum outside diameter: 2.375 inch.

3. Minimum weight: 3.12 pounds per foot.

4. Minimum wall thickness: 0.130 inch.

5. Minimum yield strength: 50,000 psi.

6. Minimum length: 9.5 feet.

7. Set in 1.0 foot diameter concrete footing, 3.5 feet below finished grade.

8. Supplied with vertical barbed wire supporting arms.

D. Top and Truss Brace Rail.

2. Minimum outside diameter: 1.660 inch.

3. Minimum weight: 1.84 pounds per foot.

4. Minimum wall thickness: 0.111 inch.

5. Minimum yield strength: 50,000 psi.

6. Minimum length: 18 feet.

E. Terminal, Corner, Pull and Gate Posts.

2. Minimum outside diameter: 4.000 inch.

3. Minimum weight: 6.57 pounds per foot.

4. Minimum wall thickness: 0.160 inch.

5. Minimum yield strength: 50,000 psi.

6. Minimum length: 11.0 feet

7. Set in 1.0 foot diameter concrete footing, 3.5 feet below finished grade.

8. Supplied with galvanized post tops.

2.2 FENCE FABRIC

A. Conform to ASTM A392 - 11A Class 1.

B. Galvanized No. 9 gauge steel wire.

C. 2 inch diamond pattern mesh.

D. Minimum breaking strength: 1200 lbs.

E. Heavily zinc coated, after weaving, by hot dip spelter process

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2.3 SMOOTH WIRE AND FABRIC FASTENERS

A. Tie wires: No. 12 gauge zinc coated steel or No. 9 gauge aluminum.

B. Hog rings: No. 9 gauge zinc coated steel or No. 7 gauge aluminum.

C. Bottom Tension wire: No. 7 gauge zinc coated steel or No. 6 gauge aluminum.

2.4 BARBED WIRE

A. Conform to ASTM 121 Class 3.

B. No. 12 1/2 gauge, double strand coated twist wire.

C. Large 14 gauge, 4 point barbs spaced approximately 5 inches apart.

D. Zinc coated with a minimum coating of 0.80 ounces per square foot of surface area on 12 1/2 gauge wire and 0.60 ounces per square foot of surface area on 14 gauge wire.

E. Mark splices in the barbed wire with a crimping tool and sleeves equal to Nicopress.

2.5 BRACE ASSEMBLY

A. Terminal, Corner, Pull, and Gate Post Bracing

1. See part 2.1D

B. Diagonal Truss Rod Assembly.

1. 3/8 inch galvanized steel with turnbuckle.

2.6 GATES

A. 12 foot double swing gate

1. Provide padlockable latching device as manufactured by Dakota Fence Products, Bismarck, ND, or equal.

2. Buried receiver pipe locking system not allowed.

3. Provide two semi-automatic outer catches to secure the gates in the open position.

B. 15 foot rolling cantilever gate

1. Provide padlockable latching device as manufactured by Dakota Fence Products, Bismarck, ND, or equal.

C. Man Gate: 3 foot gate with latching devices.

D. Structural Steel Tubing:

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2. Minimum outside diameter: 1.900 inch.

3. Minimum weight: 2.28 pounds per foot.

4. Minimum wall thickness: 0.120 inch.

5. Minimum yield strength: 50,000 psi.

6. Jointed at coroners by arc welding to form solid one piece panel.

E. Fence Fabric: see part 2.2 above.

F. Barbed Wire: see part 2.4 above.

G. Diagonal Bracing: see part 2.5 above.

H. Zinc coat all portions of the gate by the hot-dip spelter process.

I. Provide two (2) Master Lock M115XDLF padlocks or equal with four (4) keys.

PART 3 - EXECUTION

3.1 INSTALLATION

A. Install fence to the dimensions, spacing, and locations shown on the plans provided by the Project Engineer.

B. Install all posts as indicated in the plans and have no post greater than 10 feet on center from the nearest post.

1. Set posts plumb and in line with the side where the fabric is to be fastened.

2. Set posts in 1.0 foot diameter concrete footing, 3.5 feet below finished grade, as indicated on plans.

a. Mix concrete prior to placing as pouring dry mix around post is not allowed.

3. Set line posts vertically to full depth without cutting off the top to avoid rock or other obstructions.

C. Install fence fabric and barbed wire on the side of the post away from the facility.

D. Attach fence fabric to steel posts using fabric ties.

1. Line post maximum tie spacing: 15 inches.

2. Top post maximum tie spacing: 24 inches.

E. Install fence fabric parallel with finished grade with a maximum gap of 2 inches.

F. Install tension bars on all terminal, corner, pull, and gate posts.

G. Install bottom tension wire, fastened to chain link fabric, at maximum 24 inch intervals with hog rings.

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H. Install top rail with galvanized couplings for connecting the lengths into a continuous run not less than 18 feet.

I. Install vertical barbed wire arms at the top of each post with holes suitable for through passage of top rail and provide means to connect to corner and gate posts.

J. Connect 3 lines of barbed wire to each vertical barbed wire arm.

1. Install top barbed wire 12 inches above top of fence fabric.

2. Space wires uniformly.

3. Extend corner and gate posts vertically to accommodate attaching the 3 strands of barbed wire by suitable means.

K. Install brace assemblies on all corner, end, and gate posts.

1. Supply two brace assemblies, one in each direction for each corner post.

2. Attach 3/8 inch adjustable truss rod diagonally to the first ensuing line post.

3. Install braces so that posts are plumb and true when diagonal rod is under proper tension.

L. Construct and install all gates as shown on the plans.

1. Provide tension bars with bands at vertical edges and tie wires at a maximum of 12 inches on center along top and bottom edges.

2. Provide diagonal bracing to ensure frame rigidity without sag or twist.

3. Provide a 2.5 inch maximum gap between gate bottom and finished grade.

4. Ensure gate will fully open without obstruction and semi-automatic outer catches are adjusted to secure gates in the open position.

3.2 PREPARATION

A. Clear fence line of obstructions.

B. Grade surface to provide uniform gap between the fence bottom selvage and finished grade.

END OF SECTION