Art. 638.05 Precast Prestressed Concrete Sight Screen
638.05 Method of Measurement. Glare screen modules will be measured for
payment in feet (meters) in place, along the centerline of the modules. Concrete glare screen will be measured for payment in feet (meters) in place, along the centerline of the concrete glare screen.
638.06 Basis of Payment. Glare screen modules will be paid for at the
contract unit price per foot (meter) for MODULAR GLARE SCREEN SYSTEM, PERMANENT; and/or MODULAR GLARE SCREEN SYSTEM, TEMPORARY. The work of constructing concrete glare screen will be paid for at the contract unit price per foot (meter) for CONCRETE GLARE SCREEN. SECTION 639. PRECAST PRESTRESSED CONCRETE SIGHT SCREEN
639.01 Description. This work shall consist of furnishing and installing a
precast prestressed concrete panel wall sight screen.
639.02 Materials. Materials shall be according to the following.
Item Article/Section
a.Galvanized Steel Plates (Note 1) ....................................................... 1006.04
b.Galvanized Bolts and Washers ....................................................... 1006.27(f)
c.Prestressing Steel (Note 2) ............................................................ 1006.10(c)
d.Coarse Aggregate ................................................................................... 1004
e.Portland Cement Concrete ..................................................................... 1020
f.Reinforcement Bars ........................................................................... 1006.10 Note 1. Threaded inserts shall be galvanized steel capable of developing the shear strength of the bolts by which they are engaged and shall be approved by the Engineer. Note 2. The steel shall be Grade 270, have a diameter of 3/8 in. (10 mm) and have a minimum cross sectional area of 0.085 sq in. (55 sq mm). CONSTRUCTION REQUIREMENTS
639.03 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, and AASHTO Standard Specifications for Highway Bridges. The earth upon which the base of each panel rests shall be firm and level for the entire width of the panel. Excavated material which is clean and free of organic content, or sand, may be used to even out deviations from the horizontal grade at the bottom of the excavation. The bottom of the excavation shall be compacted sufficiently to prevent unequal settlement of the panels as they are set in place.
639.04 Backfill. Backfill shall be coarse aggregate and shall be thoroughly
compacted around the base of the wall using a mechanical tamper approved by the Engineer. 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.
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Source: Illinois Standard Specifications for Road and Bridge Construction, 2022 Edition. Pages 583–584 of 1,217. View official source ↗