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公开(公告)号:US06382876B1
公开(公告)日:2002-05-07
申请号:US09761825
申请日:2001-01-18
申请人: Dai Gil Lee , Jae Wook Kwon , Woo Seok Chin , Ae Kwon Yoo
发明人: Dai Gil Lee , Jae Wook Kwon , Woo Seok Chin , Ae Kwon Yoo
IPC分类号: F16L100
摘要: A method of repairing or reinforcing worn-out underground buried drainpipes by a resin transfer molding process using both flexible tubes and bagging films is disclosed. In the method of this invention, a reinforcement is primarily inserted into a desired position within a target worn-out drainpipe buried underground. The reinforcement consists of a fiber preform internally having a flexible tube, such as a silicon tube, axially extending along the central axis of the preform and wrapped with an adhesive-coated flexible film as a bagging film to provide protection from sewage or underground water. The flexible tube is, thereafter, expanded to bring the fiber preform into close contact with the interior surface of the target drainpipe. The opposite ends of the reinforcement are sealed with two lids. Thereafter, thermosetting resin is transferred into the fiber preform, thus allowing the fiber preform to be impregnated with the thermosetting resin. The impregnated resin is, thereafter, cured to shape the fiber preform as desired, thus repairing and reinforcing the target drainpipe.