Hydraulic and earth engineering – Subterranean or submarine pipe or cable laying – retrieving,...
Patent
1991-06-03
1992-04-28
Taylor, Dennis L.
Hydraulic and earth engineering
Subterranean or submarine pipe or cable laying, retrieving,...
405216, 405217, 405231, 285115, 285230, 285921, 137375, 138 32, F16L 5700, F16L 5502, F16L 700, F16L 1304
Patent
active
051082276
ABSTRACT:
A sleeve covering to surround a vent pipe which is to be buried and inserted into and connected to a T-fitting trap of a sanitary sewer system is described which sleeve covering will prevent the frost or frozen earth from heaving the pipe which it surrounds. The repeating sleeve covering is basically a number of hollow vertical sections or coupling members, generally cylindrical in shape, whose inside diameter of the bottom portion of each is slightly greater than the pipe which it surrounds. Vertical movement of the sleeve sections or coupling members (one or more or all) is possible without causing any vertical movement of the pipe that the sections surround. Also, because of the particular exterior shape (frusto-conical) of the top portion of each section, the exterior forces exerted upon same by the earth when it freezes actually tends to force the sleeve sections downward rather than upward. Also, because the sleeve covering is made up of a number of coupling members, the heaving forces exerted by the earth can be restricted to act upon an individual sleeve section and/or to act upon only a limited few such sleeve sections rather than upon the entire sleeve covering. The invention also includes a novel and greatly improved method of connecting the vent pipe to the T-fitting trap of the sewer system.
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Neyerlin Wallace F.
Ricci John
Taylor Dennis L.
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