Patent ID: 6085794
Filing Date: 2000-07-11
Classification: F16L

Abstract:
A pipe lining method for lining a main pipe and a branch pipe branched off said main pipe, said method comprising the steps of:providing a branch pipe liner bag, said branch pipe liner bag comprising a tubular resin absorbent material, a plastic film having a highly air-tight property, said plastic film being coated over the outer surface of said tubular resin absorbent material, a hardened flange formed at one end of said tubular resin absorbent material, said flange having an inner diameter smaller than an inner diameter of said tubular resin absorbent material, said flange including a cylindrical portion continuous thereto, and an unhardened hardenable resin impregnated in said tubular resin absorbent material;providing a main pipe liner bag, said main pipe liner bag comprising a tubular resin absorbent material, a plastic film having a highly air-tight property, said plastic film being coated over the outer surface of said tubular resin absorbent material, and an unhardened hardenable resin impregnated in said tubular resin absorbent material;abutting said flange of said branch pipe liner bag to the circumference of a branch pipe opening;everting and inserting said branch pipe liner bag from the main pipe into the branch pipe with a fluid pressure;pressing said branch pipe liner bag onto the inner wall of the branch pipe;hardening said hardenable resin impregnated in said tubular resin absorbent material, with said branch pipe liner bag pressed onto the inner wall of the branch pipe, to line the branch pipe;everting and inserting said main pipe liner bag into the main pipe with a fluid pressure, said fluid pressure acting inside said main pipe liner bag inserted into the main pipe, said fluid pressure being adjusted such that a portion of the hardenable resin impregnated in the resin absorbent material of said main pipe liner bag is oozed out, said oozed hardenable resin passing through a gap between the flange of said branch pipe liner bag and the inner wall of said main pipe, and flowing into a clearance space formed between the cylinder portion continuous to the flange of said branch pipe liner bag and the inner wall of the branch pipe opening and the inner wall of said branch pipe;pressing said main pipe liner bag onto the inner wall of the main pipe; andhardening said hardenable resin impregnated in said tubular resin absorbent material as well as said hardenable resin flowing into said clearance space, with said main pipe liner bag pressed onto the inner wall of the main pipe, to line the main pipe.