Construction Specification 91.pdf

Amendment 1 to AG-7442-S-09-0028

Construction Specification 91—Chain Link Fence

1. Scope The work consists of furnishing and installing chain link fencing complete with all posts, braces, gates, and all other appurtenances.

2. Material The material for the chain link fence shall be as follows:

Galvanized Chain link fence fabric shall conform to the requirements of ASTM A 392, 2-inch mesh and 9-gauge galvanized steel wire. Zinc coating shall be class 2.

Posts and fence framework shall conform to the requirements of ASTM F 1043 Group 1A, for Heavy Industrial Fence. Coatings shall be a type A galvanized coating for internal and external surfaces. Steel pipe posts shall conform to the requirements of ASTM F 1043 and F 1083.

Fence fittings shall conform to the requirements of ASTM F 626. Fittings shall be galvanized steel.

Wire ties and clips shall be 9-gauge.

Gates, gateposts, and gate accessories shall conform to the requirements of ASTM F 900. Coating shall be the same as selected for adjoining fence and framework.

Barbed wire shall be 12.5 gauge and shall conform to the requirements of ASTM A 121, chain link fence grade.

Galvanized and PVC coated Chain link fence fabric shall conform to the requirements of ASTM F 668 for class 2a or 2b, 2-inch mesh, and 9-gauge galvanized steel wire. The fabric shall have a polymer top coating of the color specified in section 6.

Posts and fence framework shall conform to the requirements of ASTM F 1043 Group 1A, for Heavy Industrial Fence. Coatings shall be a type A galvanized coating for internal and external surfaces and covered with a polymer top coating of color as specified in section 6.

Fence fittings shall conform to the requirements of ASTM F 626. Fittings shall be galvanized steel with a polymer top coating of color as specified in section 6.

Any damage to the coating shall be repaired in accordance with the manufacturer's recommendations, or the damaged fencing material shall be replaced. The contractor shall provide the engineer a copy of the manufacturer's recommended repair procedure and materials before correcting damaged coatings.

3. Installing fence posts Unless otherwise specified, line posts shall be placed at intervals of 10 feet measured from center to center of adjacent posts. In determining the post spacing, measurement is made parallel with the ground surface.

(91-1)

Posts shall be set in concrete backfill in the manner shown on the drawings.

Posts set in the tops of concrete walls shall be grouted into preformed holes to a depth of 12 inches.

All corner posts, end posts, gateposts, and pull posts shall be embedded, braced, and trussed as shown on the drawings or in accordance with appropriate industry practice if not otherwise shown or specified.

4. Installing wire fabric Fencing fabric shall not be stretched until at least 4 days after the posts are grouted into walls or 7 days after the posts are set in the concrete backfill.

Fencing fabric shall be installed on the side of the posts designated on the drawings.

The fabric shall be stretched taut and securely fastened, by means of tie clips, to the posts at intervals not exceeding 15 inches and to the top rails or tension wires at intervals not exceeding 2 feet. Care shall be taken to equalize the fabric tension on each side of each post.

Barbed wire shall be installed as shown on the drawings and shall be pulled taut and fastened to each post or arm with the tie wires or metal tie clips.

5. Measurement and payment Method 1—The length of fence is measured to the nearest 0.1 foot along the fence, including gates.

Payment is made at the contract unit price for the specified height of fence. Such payment constitutes full compensation for all labor, material, equipment, and all other items necessary and incidental to the completion of the work.

Method 2—The length of fence is measured to the nearest 0.1 foot along the fence, excluding gate openings. Payment is made at the contract unit price for the specified height of fence. The number of each size and type of gate installed is determined. Payment is made at the contract unit price for that type and size of gate. Such payment constitutes full compensation for all labor, material, equipment, and all other items necessary and incidental to the completion of the work.

All methods—The following provisions apply to all methods of measurement and payment.

Compensation for any item of work described in the contract, but not listed in the bid schedule, is included in the payment for the item of work to which it is made subsidiary. Such items and the items to which they are made subsidiary are identified in section 6 of this specification.

(91-2)

6. Items of Work and Construction Details

In Section 2, Material, chain link fence fabric shall be galvanized and coated. The polymer top coating color shall be black.

In Section 5, Measurement and Payment, none of the methods apply. The quantity of work will not measured for payment. Payment for this item will be made will be made at the contract lump sum price for the item and will constitute full compensation for all labor, equipment, tools, and other items necessary and incidental to the completion of the work.

Items of work to be performed in conformance with this specification and the construction details therefore are:

a. Bid Item 23, Chain-link Safety Fence, Impact Basin

(1) This item shall consist of furnishings all materials required and all work necessary for the installation of the chain-link safety fence for the impact basin as shown on the drawings.

(2) The barbed wire required shall be double strand 12-1/2 gauge, coating Type Z, (zinc galvanized) and coating class 3 wire conforming to ASTM A121-99.

Barbs shall be 2 point, 14 ga., round, and on 4” spacing.

(91-3)