| 摘要 |
PROBLEM TO BE SOLVED: To provide a foundation improving method capable of favourably discharging water-soluble fine earth particulates, etc., which are not suitable for load supporting soil without requiring a curing agent and efficiently compacting an internal filler. SOLUTION: A nozzle 26 for compressed water to inject compressed water W and a nozzle 27 for compressed air to inject compressed air A are provided on a lower end of a steel sheet pile 11. A drilling hole 51 is formed by driving the steel sheet pipe to specified depth underground by injecting the compressed water W and the compressed air A from these nozzles 26, 27. Fine particulates in the underground are raised along the steel sheet pile 11 by injection of the compressed water W and the compressed air A, and they are discharged on a ground surface 52. Injection of the compressed air A is stopped or reduced after discharging these fine particulates, the steel sheet pile 11 is extracted by vertically moving it, and crushed stones 53 as an internal filler are input to the inside of the drilling hole 51. These crushed stones 53 are hit by the steel sheet pile 11.
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