METHOD FOR REGENERATING AND REPAIRING EXISTING PIPING SYSTEM

PROBLEM TO BE SOLVED: To surely prevent the infiltration of a resin liquid into a branch pipe and to improve the working efficiency of regenerating and repairing work by making it possible to seal and maintain the branch port of the branch pipe to a closed state by an inverted sealing film of a front side pig at the time of installing the lining of a branch pipe route having the branched branch pipe. SOLUTION: A resin liquid (c) of the previously calculated required amt. and a pig device 27 to be arranged in the rear part thereof are introduced into the branch pipe 2 in the case the lining of the branch pipe route having the branched branch pipe 2. The fluid pressure from a pump is applied into the pipe behind the pig device 27 to integrally fluidize and progress the resin liquid (c) and the pig device 27 toward the branch port on the branch pipe route side, by which the inside of the branch pipe 2 is lined. A negative press is acted on the inside of the branch pipe 2 to push back the pig 27a on the front side in a backward advancing direction when the front half part of the front side pig 27a flows out of the branch port at the time of the time the lining ends, by which the inverted sealing film 29 is turned upside down. The branch port is sealed to the close state by the sealing film 29.