| 摘要 |
PURPOSE:To line efficiently the inner surface of an underground pipe by filling the inside of a pipe with a low-temp. liquefied gas, and discharging the gas before the inner surface of the underground pipe is coated with a liq. lining material by a body which is forced with a pressurized fluid. CONSTITUTION:A liq. lining material 2 and a lining body 3 are charged into an underground pipe 1, and the body 3 is forced through the inside of the pipe 1 by supplying a pressurized fluid into the pipe 1. The lining material 2 is carried away by the body 3, and coated on the inner surface of the pipe 1. In said method, a low-temp. liquefied gas is filled into the pipe 1 and discharged, before the lining material 2 is coated. Consequently, even when a large hole A is present in the pipe, the filled low-temp. liquefied gas flows out into the ground from the hole A, and the earth and sand B in the vicinity of the outside of the hole A is rapidly freezed with sufficient solidification strength. The lining can be efficiently carried out with high reliability in this way. |
