| 摘要 |
PROBLEM TO BE SOLVED: To make ground improvement effective by inserting a rod attached with a plasma generation probe in ground to be improved, and vaporizing moisture abruptly by plasma generated, and then tightening ground with its expansion pressure. SOLUTION: A working vehicle 30 equipped with a plasma generation device, a rod 24, or the like is moved on the ground 26 to be improved, and the rod 24 is inserted into the ground 26 while boring the ground 26 by water jet, and then the plasma generation prove 20 is led to the deepest position of the ground 26. After that, plasma is generated in the ground 26 in order to suck excessive interstitial water, and excessive interstitial water is removed so as to form a tightening part 42 in the ground 26. After the completion of the operation, the rod 24 is pulled up, and the tightening part 42 is continuously formed by repeating the same operation. Also, in the case where the tightening part 42 is expanded laterally, the rod 24 is pulled therefrom to move in the horizontal direction. In this manner, ground improvement can be done promptly.
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