Patent ID: 6382876
Filing Date: 2002-05-07
Classification: F16L

Abstract:
A method of repairing or reinforcing worn-out underground buried drainpipes by a resin transfer molding process using both flexible tubes and bagging films, comprising the steps of:inserting a reinforcement into a desired position within a target worn-out drainpipe buried underground, said reinforcement consisting of a fiber preform internally having a flexible tube axially extending along a central axis of said preform and wrapped with an adhesive-coated flexible film as a bagging film to provide protection from sewage or underground water left within the target drainpipe; expanding said flexible tube to bring the fiber preform into close contact with an interior surface of said target drainpipe; sealing each end of said reinforcement with a lid; and transferring thermosetting resin into the fiber preform to impregnate said preform with the thermosetting resin prior to curing said thermosetting resin, thus repairing or reinforcing the target drainpipe.