Illinois Department of Transportation (IDOT) · Standard Specifications for Road and Bridge Construction
Section 604 — FRAMES, GRATES, AND MEDIAN INLETS
Illinois Standard Specifications for Road and Bridge Construction, Section 604. Full text, cross-references and related pay items on BuildSpec.
Frames, Grates, and Median Inlets Art. 604.03 537 height of the casting to be protected meets the proper sizing requirements for the rubber ramps as shown below. Dimension Requirement Inside Opening Outside dimensions of casting + 1 in. (25 mm) Thickness at inside edge Height of casting 1/4 in. (6 mm) Thickness at outside edge 1/4 in. (6 mm) max. Width, measured from inside opening to outside edge 8 1/2 in. (215 mm) min. Placement shall be according to the manufacturer’s specifications. Temporary ramps for castings shall remain in place until surfacing operations are undertaken within the…
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