| 摘要 |
PROBLEM TO BE SOLVED: To recover an underground water flow cut out by a soil cement column row earth retaining wall. SOLUTION: A soil cement column row earth retaining wall A using an H-steel 3 as a core material is created on both sides of a construction site ground B by excavating it in a nonpermeable layer E under the retaining wall beyond a permeable layer D. In this case, a steel pipe 4 not reaching the permeable layer D is built into a part of the earth retaining wall A. Using an auger screw, soil cement 2 inside the steel pipe 4 is excavated and removed, and a soil cement column 2a portion under the steel pipe 4 is excavated so as to form a hollow part. Then, a nozzle of a high-pressure water injection device is inserted in place of the auger screw, and uncut portion is crushed and removed by water jet so as to provide a permeable hole 5 communicating with the permeable layer D.
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