Method for rehabilitation of underground piping
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United States of America Patent
Stats
-
Apr 14, 1998
Grant Date -
N/A
app pub date -
Feb 13, 1997
filing date -
Feb 16, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In rehabilitating underground piping, a new piping is installed by inserting a large number of unit pipes into the existing underground piping. Each of the unit pipes has a prescribed length and is connected to an adjacent unit pipe along a longitudinal direction. The unit pipe is tapered, and the tapered pipes are inserted from one of two adjoining manholes with the smaller-diameter ends directed toward the other manhole. The smaller-diameter end of the next tapered pipe is inserted into the larger-diameter end of the preceding pipe. A seal is formed at the connection by wrapping a packing made of hydrophilic rubber around the smaller-diameter end. This operation is repeated until the leading tapered pipe reaches the other manhole.
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Cited Art Landscape
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