Road structure – process – or apparatus – Pavement – Vault cover-closure
Patent
1987-07-23
1989-05-30
Bui, Thuy M.
Road structure, process, or apparatus
Pavement
Vault cover-closure
404 72, E02D 2914
Patent
active
048345741
ABSTRACT:
A utility cover extension and its process of installation are shown. The extension is adapted to rest on the cover support flange of and make a snug fit in a utility housing for a manhole cover. The extension provides an access opening above the housing. It has a rim and seat that furnish lateral retention and a new, substantially higher elevation for the cover. The extension has at least one spreadable joint for expanding its periphery against the constraint of the housing, and there is a gap in the seat at the joint when the extension is expanded. A discrete closure comprising compressible polymer is applied at the gap for preventing the substantial infiltration of surface water therethrough.
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Bui Thuy M.
Smith Matthew
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