| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an injection and agitation ground improvement method which eliminates the risk of ground collapse due to accumulated air. <P>SOLUTION: The ground G is improved using an injection and agitation ground improvement method which includes steps of: diagonally drilling the ground G using a casing pipe 11; inserting an injection pipe 21 with an injection port 22 of a hardening material J into the casing pipe 11; moving the casing pipe 11 backward and propelling the injection pipe 21 to locate the injection port 22 at a position ahead of the tip edge of the casing pipe 11 by a predetermined length L; and moving the injection pipe 21 and the casing pipe 11 backward while rotating the injection pipe 21 around an axis and injecting the hardening material J, wherein the backward movements of the injection pipe 21 and the casing pipe 11 are performed at the same time, and the injection of the hardening material J is performed so that the injection direction is not directed upward than the horizontal direction. <P>COPYRIGHT: (C)2013,JPO&INPIT |
