Pipes and tubular conduits – Repairing
Patent
1996-07-19
1998-04-21
Brinson, Patrick F.
Pipes and tubular conduits
Repairing
138 98, 264269, 427230, B05D 722
Patent
active
057408386
ABSTRACT:
There is provided a method of lining an existing underground main pipe involving a branch pipe. The method comprises injecting a necessary amount of resin into the branch pipe from an open end thereof, introducing behind the resin a pig apparatus into the branch pipe, applying a positive pressure behind the resin and pig apparatus in the branch pipe to cause the resin and pig apparatus to move forward until the entire internal surface of the branch pipe is lined with the resin by means of the pig apparatus and until the pig apparatus reaches and slightly passes beyond a branching position where the branch pipe is branching from the main pipe, applying a negative pressure behind the pig apparatus in the branch pipe to cause the pig apparatus to stop at the branching position such that the branch pipe is completely isolated from the main pipe, injecting a necessary amount of resin into the main pipe from an open end thereof, inserting behind the resin a lining pig into the main pipe, applying a positive pressure behind the resin and lining pig in the main pipe to cause the resin and lining pig to move through the main pipe along the entire length thereof, so as to form a resin lining layer on the internal surface of the main pipe.
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Itagaki Masaaki
Satake Shinobu
Shigefuji Takashi
Toyoda Shigeru
Yagi Shuichi
Brinson Patrick F.
Tokyo Gas Co. Ltd.
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