ITEM 711 – FENCE AND GUARDRAIL

711.1 Barbed Wire

Galvanized barbed wire of the coating class specified shall conform to the requirements of ASTM A 121.

Aluminum coated barbed wire shall conform to the requirements of ASTM A 585,with Type I (Aluminum Coated) or Type II (Aluminum Alloy) barbs at the option of the manufacturer.

711.2 Woven Wire

Galvanized woven wire fence of the coating class specified shall conform to the requirements of ASTM A 116. Aluminum coated woven wire fence shall conform to the requirements of ASTM A 584.

711.3 Chain Link Fence

Chain link fabric and the required fittings and hardware shall conform to AASHTOM 181, for the kind of metal, coating, size of wire and mesh specified.

Galvanized coiled spring steel tension wire shall be 7 (0.177 inch) gauge, conforming to ASTM A 641 hard temper, with Class 3 coating unless otherwise specified or shown on the drawings.

Aluminized coil spring steel tension wire shall also be 7 (0.177 inch) gauge, hard temper, having a minimum coating mass of 0.12 kg/m² of aluminum.

711.4 Metal Beam Rail

Steel rail elements shall be corrugated sheet steel conforming to the requirements of AASHTO M 180 of the designated class and type.

711.5 Timber Rail

The timber rail shall be cut from the specified grade of dry, well seasoned and dressed timber stock of the species specified, which shall meet the applicable requirements of AASHTO M 168.

Where preservative treatment is specified, this shall conform to the requirements of Section 713.3.

Rustic rails shall be straight, sound and free of injurious defects and shall have been cut from live trees not less than 30 days but not more than 1 year before use. They shall have been stripped of bark before seasoning or shall have been stored underwater. Immediately before the logs are used in the work, all knots and projections shall be trimmed and smooth and, if water cured, all barks shall be peeled. Slight curvature of “wind” to give a pleasing appearance to the structure will be permitted.

 

Logs of only one specie shall be used in the construction of any one continuous length of guardrail.

711.6 Fence Posts

Wood posts shall conform to the details and dimensions indicated on the Plans. All wood posts shall be sound, seasoned wood, peeled and with ends cut square or as indicated. The posts shall be straight and all knots trimmed flush with surface. Where treated posts are called for, the kind and type of treatment shall conform to that indicated on the Plans. When red cedar posts or bracing is furnished, the requirements for peeling may be omitted.

All dimensions timber and lumber required for fences or gates shall be sound, straight and reasonably free from knots, splits and shakes. It shall be of the species and grades indicated on the Plans and shall be dressed and finished on four sides.

Concrete posts shall be made of concrete conforming to the specified requirements of concrete, for the class specified, and shall contain steel reinforcement as shown on the Plans, conforming to the requirements of Item710, Reinforcing Steel and Wire Rope.

Steel posts for line-type fencing shall conform to ASTM A 702.

Steel posts shall be galvanized in accordance with AASHTO M 111 except that tubular steel posts shall be galvanized in accordance with ASTM A 120.Fittings, hardware and other appurtenances not specifically covered by the Plans and Specifications, shall be galvanized in accordance with ASTM A 120 and shall be standard commercial grade, and in accordance with current standard practice.

Weathering steel posts conforming to the requirements of ASTM A 558, shall be furnished when specified.

Aluminum alloy posts shall conform to the requirements of AASHTO M181.

711.7 Guardrail Post

Guardrail post shall conform to the applicable standards contained in AASHTO-AGC-ARTBA “A Guide to Standardized Highway Barrier Rail Hardware”.

711.8 Guardrail Hardware

Guardrail hardware shall conform to the applicable standards contained in AASHTO-AGC-ARTBA “A Guide to Standardized Highway Barrier Rail Hardware”.

711.9 Box Beam Rail

Steel box rail elements shall conform to the applicable standards contained in AASHTO-AGC-ARTBA” Guide to Standardized Highway Barrier Rail Hardware”.