| 摘要 |
PURPOSE:To enhance working efficiency by adopting the information of the propulsive force of a band-shaped body in a process wherein a diameter is enlarged as initial information in an engineering method having a process wherein the band-shaped body is wound in a spiral shape, a process wherein a spiral tube is manufactured, process wherein the tip of the spiral tube is fixed to an existing tube and a process wherein the diameter of the spiral tube is enlarged. CONSTITUTION:A band-shaped body 10 made of synthetic resins is changed to a spiral tube 10' by a tube making machine 20. The spiral tube 10' manufactured is thrusted into a sewer pipe 81 as an existing tube, and the diameter of the tip part of the spiral tube 10' is enlarged and fixed to the end part of the sewer pipe 81. While giving propulsive force to the band-shaped body 10 of the spiral tube 10' in the state wherein the tip of the spiral tube 10' is fixed, band-shaped wire rod 30 is separated from the spiral tube 10' at a specified speed, the diameter of the spiral tube 10' is successively enlarged from the side of its fixed tip and sticked fast to the inner surface of the sewer pipe 81. As for information concerning the propulsive force, the initial informa tion when the diameter of the spiral tube 10' is enlarged is used. As a result, enlarging work of diametger can be surely executed without being stopped. |
