| 摘要 |
PROBLEM TO BE SOLVED: To obtain the effect of preventing liquefaction of peripheral ground, concurrently with an increase in the pulling strength of a steel pipe pile. SOLUTION: An outflow port 13 of a solidification material 17 is preformed on the peripheral surface of a pile body 12 which is composed of a steel pipe. After the pile body is installed in the ground, the solidification material is pressurized and injected into the peripheral ground from the inside of the pile body through the outflow port, so as to form a diameter-enlarged section 20. Concurrently with that, soil is improved while the peripheral ground is compacted by injecting the solidification material in a pressurized state. A spiral blade 11, which is provided at least at the leading end of the pile body, is rotatively pressed into the ground. A packer 14 is mounted inside the outflow port, so that a space 18 for pressing in the solidification material is partitioned. A check valve is preprovided in the outflow port. COPYRIGHT: (C)2008,JPO&INPIT
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