| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a simple countermeasure against sand blast without increasing man-hours even when compared with the case of simply burying a water pipe and a gas pressure feed pipe. <P>SOLUTION: A burying structure of the gas pressure pipe 3 is formed by adjacently burying the water pipe 2 and the gas pressure feed pipe 3 underground, and a cement bentonite solidification protective layer 4 comprising cement bentonite is provided between the water pipe 2 and the gas pressure feed pipe 3 and at the circumferential part of the gas pressure feed pipe 3. <P>COPYRIGHT: (C)2013,JPO&INPIT |
