| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a safety device for soil improvement and a soil improvement method, capable of preventing the burst of a hose for cement slurry injection and improving safety. <P>SOLUTION: A safety valve is provided in an injection path for injecting cement slurry to soil, and when the pressure of the cement slurry injected to the soil through the injection path exceeds a set pressure set beforehand, the cement slurry can be discharged from the injection path. Circulation means guides the cement slurry discharged from the injection path by the safety valve to the entrance of the injection path. Stop means stops the supply of the cement slurry to the injection path when the pressure of the cement slurry injected to the soil through the injection path exceeds an upper limit pressure set at a pressure equal to or higher than the set pressure. <P>COPYRIGHT: (C)2012,JPO&INPIT |
