| 摘要 |
PROBLEM TO BE SOLVED: To efficiently conduct ground-improvement construction works accompanied by a ground upheaval, such as compaction sand-pile driving in a shallow sea without the possibility of work interruption. SOLUTION: An area A of preceding improvement is improved in a triangular shape, in which an intersection angleαbetween the front edge 3 of the area A and a side edge 4 on the area B side of adjacent improvement is an acute angle, a working craft 1 is transferred to an area B, the working craft 1 is moved intermittently to an oblique rear section under the state in which only one-side corner section 5 of the front end section of the working craft 1 is protruded into the area A, the area B is improved in a parallelogram and an area C, an area D, etc., are also improved similarly.
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