618.01 Description. This item shall consist of furnishing and
erecting guard cable in conformity with the lines a nd grades shown on the plans or as designed by the Engineer.
618.02 Materials. All materials used in this construction shall
comply with the following requirements:
a.Posts. Posts may be either wood or steel unless a specif ic type is indicated on the plans. Wood posts shall be treated timber. All posts shal l be of seasoned straight Southern yellow pine or Douglas F ir of the West Coast Region complying with Section 817 and the cla ssification shown on the plans. The posts shall conform to the dimensions shown on the plans. Posts shall be pressure treate d by the standard empty cell or full cell process according to AWPA p ractice with creosote to retain a minimum of 12 pounds per cubic foot (190 kg/cu m) of wood, or with pentachlorophenol or chromated 462 copper arsenate to retain a minimum of 0.6 pounds p er cubic foot (9.6 kg/cu m) of wood. Steel posts shall consist of structural shapes of t he section shown on the plans. In lieu of the structural shapes spe cified, the Contractor may furnish comparable posts of welded b eam construction fabricated by the electric-resistance welding process of ASTM A 769. The steel shall comply with AASHTO M 2 70, Grade 36 (250). Posts shall be galvanized according to A ASHTO M 111.
b.Guard Cable. Guard Cable shall be one of the following: • Zinc coated steel wire strand cable, 1/2" (12 mm) in diameter, seven wire strand, common, Siemens-Martin or high strength grade, Class A coating, complying wit h ASTM A 475. • Aluminum-zinc alloy coated steel wire strand cable , 1/2" (12 mm) in diameter, seven wire strand, Siemens-Ma rtin or high strength grade, complying with ASTM A 474.
c.Anchors and Fittings. Turnbuckles shall comply with AASHTO M 269 or FF-T-791b, Type I, Form 1, Class 2. Clips shall comply with FF-C-450d Type I, Class 1 or 2. Thimbl es shall comply with FF-T-276b Type II or III. Eyebolts, an chors, stub ends, and other miscellaneous fittings shall comply with AASHTO M 102 or M 269 or M 183. All fittings shall be galvanized according to AASHT O M 232, M 111, or ASTM B 695 Class 40 or 50.
d.Bolts, Nuts, and Washers. Bolts, nuts, and washers shall conform to the plans and shall be steel complying w ith ASTM A 307, ASTM A325, or ASTM A449 (Heavy Hex), , galvanized according to AASHTO M 232. Threads on b olts and nuts shall conform to Unified Coarse Thread Series Class 2A, ANSI B 1.1 (Metric Coarse Thread Series, ANSI B 1.1 3M, 6g tolerance).
e.Delineators. Delineators shall consist of white or yellow reflectors complying with Subsection 728.02. A Type 1 (White or Yellow) delineator shall be a si ngle 3" x 8" (75 x 200 mm) vertical rectangle with 3/4" (20 mm) corner radii and 463 two 13/64" (6 mm) diameter mounting holes spaced 6" (150 mm) on center. A Type 2 delineator shall consist of the mounting o f white delineators on both sides as shown on the plans. The delineator shall be fabricated from 0.080" (2.0 mm) aluminum and shall comply with Section 723. Reflec tive sheeting shall comply with Section 728.
f.Delineator Post Extensions. Metal delineator post extensions shall comply with Subsection 728.02 for U-Section c hannel. Wood line posts may be lengthened as shown on the plans for attachment of the delineators.
618.03 Construction Methods. The alignment and location of
guard cable shall be according to the plans or as d irected by the Engineer. Posts shall be spaced as shown on the plans and set plumb in hand or mechanically dug holes, or by driving. The manner of driving shall be such as to avoid battering or dist orting of posts. Post holes shall be backfilled with moist sand and thoroughly compacted as placed. Chipped or damaged galvanizin g on steel posts shall be repaired in the field as stipulated in AASHTO M 36. Guard cable shall be strung directly from the reel and shall be pulled tight after the initial anchoring. The cabl e shall then be attached to the second anchor assembly with all tur nbuckles fully opened. The cables shall be completely anchored be fore being attached to the line posts. Delineator post extensions shall be attached to the guard cable line posts and spaced as shown on the plans. White and/or yellow delineators shall be mounted on the delineator post extensions as required by the direction of traffic as shown on th e plans.
618.04 Method of Measurement. Guard Cable will be
measured by the linear foot (meter) complete in pla ce. The measurement will be to the nearest linear foot (met er) and will be made from center of end post to center of end post. Guard Cable Anchor will be measured by the unit which will incl ude all fittings, hardware, and the anchor device between the center of the post and into the ground. 464 618.05 Basis of Payment. Work completed and accepted and measured as provided above will be paid for at the contract unit price bid per linear foot (meter) for Guard Cable a nd per each for Guard Cable Anchor, which price shall be full compe nsation for furnishing all materials; for installing posts, gua rd cable, and delineators; for excavation and backfill; and for a ll labor, equipment, tools, and incidentals necessary to complete the wo rk. Payment will be made under: Pay Item Pay Unit Guard Cable Linear Foot (Meter) Guard Cable Anchor Each
Source: , Edition.