Method and apparatus for lining a branch pipe

Details Method and apparatus for lining a branch pipe Method and apparatus for lining a branch pipe

1994-03-15

1996-03-12

Vargot, Mathieu D.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Producing multilayer work or article

156287, 156294, 264 36, 264269, 425 3, B29C 6336

Patent

active

054983894

ABSTRACT:
A method and apparatus for lining a branch pipe is provided which can directly achieve an air-tight connection between a pressure bag and a branch pipe liner bag in a simple structure without employing a conventionally required sealed tube. An open end of the pressure bag is attached to a set nozzle made of a magnetic material coupled to a work robot which is movably installed in a main pipe. A branch pipe liner bag, impregnated with a thermosetting resin, is placed inside the pressure bag. The liner bag has a flange which includes a magnetic plate so as to be magnetically connected to the set nozzle by a magnetic force of a magnet provided for the work robot. With the flange being closely contacted to the inner wall of the main pipe around a branch pipe opening, compressed air is supplied into the pressure bag to evert and insert the branch pipe liner bag into a branch pipe. While the branch pipe liner bag is pressed against the inner wall of the branch pipe, the thermosetting resin impregnated in the branch pipe liner bag is cured, whereby the inner wall of the branch pipe is lined with the cured thermosetting resin, i.e., the branch pipe is repaired. Upon completing the lining operation, the magnet is turned off to remove the work robot and the pressure bag from the branch pipe liner bag.

REFERENCES:
patent: 4434115 (1984-02-01), Chick
patent: 5356502 (1994-10-01), Kamiyama et al.

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