Chain Link Fence Sight Screen Art. 640.02
639.05 Lifting Devices. The type, number, and locations of lifting devices
and the method of handling the precast prestressed panels shall be determined by the fabricator and approved by the Engineer. Portions of the lifting devices which project beyond the surface of the panel shall be sawed or burned off after erection. Lifting devices shall not be located in the surface of the panel facing toward the road.
639.06 Fabrication. The fabrication of the precast prestressed panels shall
be according to the Manual for Fabrication of Precast Prestressed Concrete Products in effect on the date of invitation for bids.
639.07 Method of Measurement. The concrete wall will be measured for
payment in feet (meters). The overall length will be measured along the longitudinal axis of the wall from the extreme ends of the end panels.
639.08 Basis of Payment. This work will be paid for at the contract unit price
per foot (meter) for SIGHT SCREEN (PRECAST PRESTRESSED CONCRETE PANEL WALL), of the height specified. SECTION 640. CHAIN LINK FENCE SIGHT SCREEN
640.01 Description. This work shall consist of furnishing and installing a
chain link fence sight screen.
640.02 Materials. The steel posts shall be galvanized according to
ASTM A 53. Structural steel tubing shall be according to ASTM A 501 and shall be galvanized according to AASHTO M 111. Fabric ties, fittings, bolts, nuts, and all other hardware shall be according to the applicable portions of Article 1006.27. The top and middle brace rails shall be steel pipe 1 5/8 in. (41 mm) outside diameter, weight (mass) of 2.27 lb/ft (3.30 kg/m) and galvanized according to ASTM A 53. Wood privacy slats shall be 5/16 or 3/8 in. x 2 3/8 in. (8 or 10 mm x 60 mm) and shall be factory installed. The slats shall be untreated redwood or cedar or treated timber of an approved alternate treated according to Article 1007.12. The slats shall be sound without decay or rot, containing no knot holes larger than one-half the width of the slat. Steel chain link fabric shall be zinc-coated steel fabric or aluminum-coated steel fabric according to Article 1006.27. The fabric shall be #9 gauge (3.76 mm) wire woven in 3 1/2 x 5 in. (89 x 125 mm) mesh with the top and bottom selvages knuckled. Zinc-coated or aluminum-coated metal slats of #26 gauge (0.5 mm) steel strip, 2 3/4 in. (70 mm) minimum width, shall be inserted into the chain link fabric, as shown on the plans, after the fabric is mounted against the posts. The zinc coating shall be according to ASTM A 653M coating designation Z275 (A 653 coating designation G90). The aluminum coating shall be according to ASTM A 463 coating designation TI 40. The coating on the slats shall be the same type as on the fabric. Art. 640.02 Chain Link Fence Sight Screen Chain link fabric shall be attached to pull posts using minimum 1/4 x 3/4 in. (6 x 19 mm) flat stretcher bars and #12 gauge (2.69 mm) by 1 in. (25 mm) wide stretcher bar bands with 3/8 in. (10 mm) diameter carriage bolts. Stretcher bars, stretcher bar bands, and carriage bolts shall be according to Article 1006.27. Tension cable shall be 3/8 in. (10 mm) diameter, 1 x 7 steel strand with 10,800 lb (48 kN) minimum breaking strength according to ASTM A 475 with Class B galvanized coating. Cable clamps and turnbuckles for use with tension cable shall be galvanized steel, be adequate to develop the full strength of the cable, and be approved by the Engineer. Truss rods shall be 3/8 in. (10 mm) diameter and be provided with turnbuckles or some other suitable means of adjustment, and be according to Article 1006.26(b). CONSTRUCTION REQUIREMENTS
640.03 General. The sight screen shall be as shown on the plans and
according to AASHTO LRFD Specifications for Structural Supports for Highway Signs, Luminaires, and Traffic Signals. Pull posts shall be spaced as follows.
a.240 ft (70 m) maximum centers for 6 ft (1.8 m) fence.
b.200 ft (60 m) maximum centers for 8 ft (2.4 m) fence.
c.160 ft (48 m) maximum centers for 10 ft (3.0 m) fence. All posts shall be set in foundations of Class SI concrete of the depth and diameter shown on the plans. Chain link fence construction shall be according to Section 664. The chain link fabric shall be installed on the side of the posts facing toward the road, so the line posts and brace rails are hidden from the view of passing motorists.
640.04 Grounding. Continuous fence shall be grounded at intervals not
exceeding 500 ft (150 m) in urban areas and 1,000 ft (300 m) in rural areas. Fence under a power line shall be grounded by three grounds, one directly under the crossing and one on each side, 25 to 50 ft (7.5 to 15 m) away. A single ground shall be located directly under each telephone wire or cable crossing. The ground wire shall be connected to the fabric and the ground rod by a mechanical clamp of a cast bronze body and bronze or stainless steel bolts and washers. The bottom connection of the ground wire shall be made to the tension cable.
640.05 Method of Measurement. Chain link fence sight screen will be
measured for payment in feet (meters), along the top of the fence from center to center of the end posts. Wood Fence Sight Screen Art. 641.02
640.06 Basis of Payment. This work will be paid for at the contract unit price
per foot (meter) for SIGHT SCREEN (CHAIN LINK FENCE) of the height specified. SECTION 641. WOOD FENCE SIGHT SCREEN
641.01 Description. This work shall consist of furnishing and installing wood
fence sight screen.
641.02 Materials. Bolts and washers shall be according to Article 1006.17.
Nails shall be galvanized common wire nails. All lumber shall be sound and free from excessive splitting or deterioration. Dimensions shown on the plans are for surfaced (S4S) lumber. Rough sawn lumber of the nominal size shown may be used for any members provided it can be successfully stress graded and pieces of the same nominal size are sawn to a uniform width and thickness. The required grade of lumber is visually stress graded according to the rules of the following agencies:
a.Douglas Fir & Western Red Cedar - West Coast Lumber Inspection Bureau
b.Southern Pine-Southern Pine Inspection Bureau
c.Red (Swamp) Cypress-National Hardwood Lumber Association The grades shown below in the table are the minimum acceptable and all species shown are alternates for the indicated usage. All wood, except Red (Swamp) Cypress and Western Red Cedar, used for posts, rails, or planks, shall be treated according to Article 1007.12. Fence Height Usage in. (mm) Lumber Species Commercial Grade 6 ft (1.8 m) or 8 ft (2.4 m) Rails 3 x 4 (75 x 100) Douglas Fir Southern Pine No. 2 No. 2 Posts 6 x 8 (150 x 200) or 8 x 8 (200 x 200) Douglas Fir Southern Pine No. 2 No. 2 Planks Red (Swamp) Cypress Southern Pine Western Red Cedar No. 2 No. 2 No. 1 Fencing
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Source: Illinois Standard Specifications for Road and Bridge Construction, 2022 Edition. Pages 584–586 of 1,217. View official source ↗