| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a back filling method for an underground pipe, not affecting the underground pipe even if water leaks from a water pipe. SOLUTION: A rubber protective material is wound on a gas pipe 3 buried next to a water pipe 2, and a part between the water pipe and a gas pipe is back filled by using fluidizing processing soil 4. The part above is it filled by using the dug soil 4. Therefore, a sand blast phenomenon is not generated even is water leaks from the water pipe 2, and the gas pipe 3 can be prevented from being damaged.</p> |
