Method of lining a branch pipe

Details Method of lining a branch pipe Method of lining a branch pipe

1994-07-14

1995-10-03

Scherbel, David A.

Pipes and tubular conduits

Repairing

Patches

138 97, 156287, F16L 5516

Patent

active

054544017

ABSTRACT:
A branch pipe lining method of the invention utilizes a branch pipe liner bag impregnated with a hardenable resin and having a flange at one end thereof, wherein the flange is folded out and mounted to a fluid pressure sealing nozzle; the branch pipe liner bag is everted and insertied into a branch pipe; an upper end of the branch pipe liner bag is pulled up by a rope or the like with the flange thereof being secured on the inner wall of the main pipe; the fluid pressure sealing nozzle is removed from the branch pipe liner bag; a sealing pressure bag introduced into the main pipe is expanded to seal a lower opening of the branch pipe liner bag with the sealing pressure bag; the upper end of the branch pipe liner bag is closed, and the branch pipe liner bag is pressed against the inner wall of the branch pipe with a fluid pressure; and the hardenable resin impregnated in the branch pipe liner bag is hardened while the branch pipe liner bag is continuously being pressed against the inner wall of the branch pipe. After the lining is completed, the sealing pressure bag can be easily removed from the branch pipe liner bag after it has been hardened, so that any fragment of the sealing pressure bag will not remain on the inner wall of the branch pipe, with the result that the inner wall surface of the branch pipe can be maintained in a favorable condition.

REFERENCES:
patent: 4368091 (1983-01-01), Ontsuga et al.
patent: 4758454 (1988-07-01), Wood
patent: 4836715 (1989-06-01), Wood
patent: 5329063 (1994-07-01), Endoh

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