| 摘要 |
PURPOSE:To make it possible to surely bring synthetic resin tube into tight contact with the inner surface of existing tube without using adhesive or the like by a method wherein lining material is pulled in the existing tube under the condition that the temperature of the atmosphere in the existing tube is held at a temperature, which is higher than the shape restoring temperature and lower than the shape memory temperature, and, after that, an expanding jig is forcibly fed from the one end of the existing tube in the lining material and synchronously a film tube is pulled out of the resin pipe. CONSTITUTION:The temperature in an existing tube 1 is held at a temperature, which is higher than the shape restoring temperature and lower than the shape memory temperature of resin pipe 3 forming lining material 2, by means of heated water, which is continuously fed from a sealing part and discharged from the heated water discharging port 9 of a sealing part 8. After the provision of the lining material 2 in the existing tube and the stoppage of the supply of the heated water, pressurizing water is fed from a pressurizing water feeding port 7 so as to forcibly feed an expanding jig 11 in the lining material 2. At this time, by pulling out a film tube 4 in interlocking with a speed control rope 12 so as to keep the rear end part 4a of the film tube 4 on locating at the tip part of the expanding jig 11 at all time, the pressing part 3a, which is pressed by the expanding jig 11, of the resin pipe 3 under softened state is expanded outwards by the shape restoring force of the resin pipe 3 and the pressing force of the expanding jig 11 so as to restore the shape of the resin pipe 3 by delivering the air and stagnant water in the existing tube. |
