Method of lining branch pipe portion of underground main pipe with rigid plastics tube
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United States of America Patent
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-
Sep 11, 1990
Grant Date -
N/A
app pub date -
Dec 23, 1988
filing date -
Dec 28, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of forming a rigid or semirigid plastics tube lining over the inner surface of a branch pipe portion as joined at its one end to an underground main pipe through the other end thereof substantially open to the surface of the ground as a work opening, the method being characterized by inserting a rigid or semirigid plastics tube into the branch pipe portion from the work opening with the forward end of the tube substantially closed, and subsequently supplying a fluid into the tube to inflate the tube radially of the branch pipe by applying heat and pressure to the tube with the fluid from inside directly or indirectly and thereby line the branch pipe portion with the rigid plastics tube. The pipe portion can be lined from the ground surface efficiently without necessitating labor for excavation of the ground, cutting off the branch pipe portion and restoring the piping to the original state.
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