REHABILITATING UNDERGROUND PIPES

摘要

PCT No. PCT/AU89/00184 Sec. 371 Date Dec. 18, 1990 Sec. 102(e) Date Dec. 18, 1990 PCT Filed May 1, 1989 PCT Pub. No. WO89/11060 PCT Pub. Date Nov. 16, 1989.A method of rehabilitating underground pipes which comprises the steps of: (a) forming a liner pipe (5) by winding a strip (4) made of a synthetic resin into a helical shape so that the side edges of the convolutions of the wound strip (4) are interengaged with each other; (b) continuously introducing the liner pipe (5) into an underground pipe (1) while the liner pipe (5) is being advanced inside the underground pipe (1); inserting a slip restraining member in the form of a wire rod (6) continuously to the interconnected edges of the convolutions of the said strip (4), and then removing the said strip (4) when the diameter of said liner pipe (5) is to be increased at the same rate as said strip (4) for forming said helical liner pipe (5) is conveyed.