Art. 637.10 Glare Screen
637.10 Protective Coat. When required, protective coat shall be applied to
the top and vertical surfaces of the barrier exposed to traffic. The protective coat shall be constructed according to Article 420.18.
637.11 Method of Measurement. This work will be measured as follows.
a.Contract Quantities. The requirements for the use of contract quantities shall be according to Article 202.07(a).
b.Measured Quantities. New barrier base, both separate and monolithic, will be measured for payment in feet (meters) in place, along the centerline of the base or barrier. The width of the base will be defined as the width of the barrier. Concrete barrier will be measured for payment in feet (meters) in place, along the centerline of the barrier. Barrier transitions will be measured for payment in feet (meters) in place, along the centerline of the transition. Protective coat will be measured for payment in place and the area computed in square yards (square meters).
637.12 Basis of Payment. This work will be paid for at the contract unit price
per foot (meter) for CONCRETE BARRIER BASE; CONCRETE BARRIER, DOUBLE FACE, of the height specified; CONCRETE BARRIER, SINGLE FACE, of the height specified; and CONCRETE BARRIER TRANSITION. When a double face concrete barrier with a variable cross-section is required, and the variation exceeds 3 in. (75 mm), the barrier will be paid for at the contract unit price per foot (meter) for CONCRETE BARRIER, VARIABLE CROSS-SECTION, of the height specified. Protective coat will be paid for according to Article 420.20. SECTION 638. GLARE SCREEN
638.01 Description. This work shall consist of furnishing and constructing
permanent glare screens, consisting of concrete glare screens or a modular glare screen system, mounted on concrete medians; or furnishing, installing, maintaining, and removing a temporary modular glare screen system on top of temporary concrete barriers.
638.02 Materials. Materials shall be according to the following.
Item Article/Section
a.Portland Cement Concrete (Note 1) ....................................................... 1020
b.Reinforcement Bars ........................................................................... 1006.10
c.Modular Glare Screen System ................................................................ 1085
d.Nonshrink Grout ................................................................................. 1024.02
e.Chemical Adhesive ................................................................................. 1027 Glare Screen Art. 638.04 Note 1. Concrete shall be Class SI concrete. CONSTRUCTION REQUIREMENTS
638.03 Modular Glare Screen System. The modular glare screen system
shall be installed according to the details shown on the plans and according to the manufacturer’s specifications. The same size and type of modules shall be used throughout the project. The modules shall be installed along the top of the concrete barrier, and centered across the width. The maximum length and width of the base rails or modules shall not exceed the dimensions of the top of the individual concrete barrier sections. Base rails or modules shall be placed true to line and shall be firmly attached to the concrete barrier with the type, size, and number of anchor studs, bolts, or self-tapping screws as specified by the manufacturer. Anchor studs, bolts, or self-tapping screws shall be at least 3 in. (75 mm) from contraction, expansion, or construction joints in the barrier. The base rails or modules shall not extend over the joints between the concrete barrier sections. The base rails or modules shall be installed so the combination of glare screen blade width and spacing provide for a minimum 22 degree sight cut-off angle or as shown on the plans. The Contractor shall load test four percent of all anchor studs, bolts, or self- tapping screws in the presence of the Engineer. The equipment and method used shall meet the approval of the Engineer. The minimum test load shall be 4000 lb (18 kN) in direct pull. For each anchor that fails the test requirement, two more anchor studs, bolts, or self-tapping screws picked by the Engineer, shall be tested. Each anchor stud, bolt, or self-tapping screw that fails to meet the test requirement shall be reset, or removed and the hole drilled deeper and reset, and retested until it meets the test requirements. When the modules are used for temporary application, the Contractor shall be responsible for maintaining the modules or parts, and shall replace damaged blades or modules with the same size and type as those used throughout the project. All construction operations whether for permanent or temporary application shall be performed on one side of the concrete barrier. Any damage done to the concrete barrier by the Contractor's operation shall be repaired.
638.04 Concrete Glare Screen. Concrete glare screen shall be constructed
according to the applicable portions of Section 637. When concrete glare screen is constructed on an existing concrete barrier, the vertical reinforcement bars shall be anchored in place in drilled holes in the barrier with nonshrink grout or chemical adhesive. Joints in the concrete glare screen shall be a continuation of joints in the existing concrete barrier and shall be of the same configurations. In addition, if there is a crack in the barrier that is working as a joint, a joint shall be placed over it in the glare screen and the reinforcement shall be cut. When concrete glare screen is constructed on new concrete barrier, it may be constructed integrally with the barrier. Joints in the glare screen shall be according to
Article 637 — 08.
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.
Referenced in this section
Sections that cite this one
GLARE SCREEN in other states
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Source: Illinois Standard Specifications for Road and Bridge Construction, 2022 Edition. Pages 581–583 of 1,217. View official source ↗