Patent ID: 7717648

Claim:
A method of repairing a drainage pipe that is buried in the ground, is connected between a pair of connection bodies respectively having upper access openings, and is configured for guiding sewage and rainwater therethrough, said method comprising: providing a corrugated resin pipe having a pipe axis and being extendible and contractible along a pipe axis direction, said corrugated resin pipe having a leading head part and comprising a soft resin straight pipe portion, and hard resin ridge portions formed spirally or in rings on an outer wall of said soft resin straight pipe portion, said soft resin straight pipe portion having a reinforcement material embedded therein that restricts elongation in the pipe axis direction so as to prevent said soft resin straight pipe portion of said corrugated resin pipe from elongating beyond a product length thereof upon application of tensile force thereto; supplying said corrugated resin pipe into one of the connection bodies from said upper access opening thereof; inserting said head part of said corrugated resin pipe into the drainage pipe through an opening that connects the drainage pipe to said one of the connection bodies; extending said corrugated resin pipe successively from said head part of said corrugated resin pipe from a contracted condition of said corrugated resin pipe either in said supplying of said corrugated resin pipe into said one of the connection bodies from said upper access opening thereof from a position of the corrugated resin pipe arranged above said one of the connection bodies, or in said inserting of said corrugated resin pipe into the drainage pipe through the opening that connects the drainage pipe to said one of the connection bodies from a position of said corrugated resin pipe in said one of the connection bodies: pulling, from the other of said connections bodies, said corrugated resin pipe into the drainage pipe; and laying said corrugated resin pipe over an entire length of the drainage pipe between said connection bodies.