Road structure – process – or apparatus – Pavement – Vault cover-closure
Patent
1982-10-14
1984-10-09
Leppink, James A.
Road structure, process, or apparatus
Pavement
Vault cover-closure
52 20, 285226, 285236, 277200, 277212FB, 403 50, E02D 2912
Patent
active
044758456
ABSTRACT:
A cylindrical elastomeric seal is disclosed for externally sealing a manhole assembly against surface water infiltration between the manhole casting and the supporting structure and through the supporting structure. The seal has a first sealing section adapted to receive the edge of the flange of a manhole casting, a second sealing section adapted to be received by the external surface of the manhole chimney or cone, and an intermediate section, joining the two sealing sections, that spans the vertical distance between the casting and the chimney or cone. Sealing means hold the two sealing sections in place against the casting and chimney or cone, creating watertight seals. An extension skirt increases the area the seal can cover, allowing the entire supporting structure to be sealed in the case where the chimney height is too great to be spanned by the intermediate section of the seal alone. The seal can be used on old or new construction and does not interfere with normal use of the manhole.
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State of Michigan, Dept. of State Highways, Supplemental Specification 8.08 (2), External Type Rubber Gaskets for Sealing Culvert and Sewer Pipe Joints.
Anderson David E.
Odill Frank J.
Hjorth Beverly E.
Leppink James A.
The Cretex Companies, Inc.
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