Hydraulic and earth engineering – Subterranean or submarine pipe or cable laying – retrieving,...
Patent
1997-01-15
1998-05-19
Graysay, Tamara L.
Hydraulic and earth engineering
Subterranean or submarine pipe or cable laying, retrieving,...
52 20, 52 21, B63B 3504
Patent
active
057527873
ABSTRACT:
A base for a manhole or catch basin structure having an embedded plastic canal-bed liner and a corresponding hood. The plastic liner has an annular, outwardly extending flange which becomes embedded in a sidewall of the base to form a unitary structure when the concrete is poured. The liner is not subject to delamination from the canal-bed and includes bosses for additional anchoring to the base. In an alternative preferred embodiment, a seal and seal adapter are provided. The adapter, in combination with an integral socket of the canal-bed liner, restrains the seal within a canal-bed sidewall opening. This combination also serves to conveniently position the seal at time of casting. The canal-bed liner and hood serve to protect the concrete base and cone of the manhole from corrosive fluids, thus extending the useful life of the manhole structure.
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GU-Manhole Liners Ltd., Jun. 1989.
"GU Lined Manholes", GU Industries Inc. (undated).
Graysay Tamara L.
Lagman Frederick L.
Royal Anchor Systems, Inc.
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