| 摘要 |
PROBLEM TO BE SOLVED: To provide a laying method of pipe for laying a plurality of pipes (cable protection pipes) in an existing pipe, and to provide a pipe used in the laying method.SOLUTION: When laying a cable protection pipe 1 which is produced by covering the outer periphery of a protection pipe body molded of thermoplastic resin with a restriction sheet, in an existing pipe 2, the cable protection pipe 1 is pulled into the existing pipe 2, and one end of the cable protection pipe 1 is fixed to the end face of the existing pipe 2 by means of a fixing device 71. While pulling the other end of the cable protection pipe 1 in the direction of the axis line by means of a jack device 72, heating steam is supplied in the cable protection pipe 1 thus molding the cable protection pipe 1 into a cylindrical shape. Outer diameter of the protection pipe body enlarged by shape recovery is limited after the restriction sheet, and a straight cable protection pipe 1 of a predetermined outer diameter is laid in the existing pipe 2. |
