| 摘要 |
PROBLEM TO BE SOLVED: To provide a ground injection method capable of forming geology improved areas in a ground around a ground hole without almost a space. SOLUTION: A step for inserting an injection tube 20 into the ground until the lower end thereof reaches an underground deep position, jetting a high-pressure water/steam H from the nozzle hole 20N of the injection tube 20 toward the other ground 1, and forming a roughly disk-like injection space V1 by rotating the injection tube 20 to cut the ground 1 around the underground deep position is repeatedly performed while stepwise lowering the injection tube 20. Also, a step for flowing an injection material G for improving geology from the injection hole 20a1 of the injection tube 20 for each underground deep position where the injection space V1 is formed while stepwise raising the injection tube 20 and penetrating the injection material G for improving geology into the ground 1 around the underground deep positions through the injection space V1 and solidifying the injection material to form the geology improved areas Z1 stacked in the vertical direction is repeatedly performed. COPYRIGHT: (C)2005,JPO&NCIPI
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