| 摘要 |
<P>PROBLEM TO BE SOLVED: To reliably prepare an improvement body having a large scale in a ground while securing sufficient long-term strength using cement and fixed early strength using water glass. <P>SOLUTION: This improvement body preparation method comprises the steps of: at first precedingly forming a cement distribution region 2 in a region of a ground 1 for an improvement body to be formed (Step 101); and then high-pressure injecting water glass solution via a discharge port 4 provided near the lower end of a rod 3 together with compressed air while rotating the rod 3 around a member axis and moving it down along the member axis (Step 104). When the water glass solution is high-pressure injected into the cement distribution region 2 together with the compressed air, the rod 3 is positioned so that its depth corresponding to the vicinity of a region upper edge 31 out of the cement distribution region 2 becomes an injection starting position. Then, the water glass solution and the compressed air are high-pressure injected from the discharge port while moving the rod 3 down to move the discharge port 4 as an injection position downward, and the high-pressure injection is finished at the depth corresponding to the vicinity of the region lower edge 32. <P>COPYRIGHT: (C)2013,JPO&INPIT |
