Plastic pipe comprising an outer corrugated pipe and a smooth inner wall
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United States of America Patent
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-
Oct 29, 1991
Issued Date -
N/A
app pub date -
Sep 1, 1989
filing date -
Aug 23, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A plastic pipe consisting of an outer corrugated plastic pipe and an inner smooth wall consisting of a wear resistant elastomer, particularly a thermoplastic rubber fixed in the inner bottoms wave valleys to said outer corrugated pipe. The inner wall consists of a pipe which has been coextruded with the outer corrugated pipe so that the inner and outer pipe are heat welded to each other. The cavities between the inner pipe and the corrugations may be filled with a foam plastic. This plastic pipe is used for repairing or renewing a sewage pipe by installing such a pipe from a vertical shaft of the sewage system into the sewage pipes. The interstices between the outer side of the corrugations and the inner side of the sewage pipe may be filled with a mortar.
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