INSERTING RESIN PIPE USED FOR REPAIR OF EXISTING PIPELINE, AND REPAIRING TECHNIQUE OF EXISTING PIPELINE USED THEREWITH

摘要

PURPOSE:To provide an inserting-resin pipe in which passage resistance is small in even a curved pipeline when the inserting-resin pipe is fed into an existing pipeline. CONSTITUTION:An inserting-resin pipe 1 is formed into the structure of the internal and external two layers by using thermoplastic and crystalline polyethylene material. The internal layer 12 is formed of low density polyethylene material in which flexural rigidity is small and density is <=0.920g/cm<3>. The external layer 13 is formed of medium density and high density polyethylene material whose density is 0.930-0.965g/cm<3>. The wall thickness ratio of the internal layer 12 is made larger than the wall thickness ratio of the external layer 13 to soften the flexural rigidity of a tubular body under the ordinary temperature. The external layer 13 is constituted of material capable of applying an electrofusion joint without changing its fusion bonding conditions. The electrofusion joint is formed of the same material as a polyethylene pipe used for a conventional gas pipe and developed for the gas pipe.