Method for rehabilitation of underground piping

Details Method for rehabilitation of underground piping Method for rehabilitation of underground piping

1997-02-13

1998-04-14

Scherbel, David

Pipes and tubular conduits

Repairing

138112, 138120, F16L 55162

Patent

active

057381461

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.

REFERENCES:
patent: 1476830 (1923-12-01), Newell
patent: 1481149 (1924-01-01), Quinn
patent: 2696264 (1954-12-01), Colmerauer et al.
patent: 3813477 (1974-05-01), Fischer
patent: 4848407 (1989-07-01), Smith et al.
patent: 4954016 (1990-09-01), Storgard
patent: 4958959 (1990-09-01), St. Onge
patent: 5033512 (1991-07-01), Abbema
patent: 5635675 (1997-06-01), Houga

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