Construction method and construction support system of static press-in compaction method

摘要

PROBLEM TO BE SOLVED: To prevent a rod from jamming after injection of one day is completed and to speedily start injection work on next and succeeding days when it is necessary to inject an improvement material for several days by a static press-in compaction technique.SOLUTION: In a drilling process, drilling is so performed that a hole wall becomes larger than a rod diameter, and in a following injection process, an improvement material is injected into the soil through a rod 12 so that the improvement material is push back into a gap 4 between a rod periphery and the hole wall. After injection of one day is completed, a washing instrument 14 is pressed in the rod to wash away the inside of the rod with hydraulic pressure, and the rod is rotated for edge cutting between the improvement material to be solidified with time and the rod. The rotation of the rod is started within several hours after the injection of the day is completed, and the rod is rotated for several minutes, for example, at intervals of several hours after the initial rotation is started. The rod is thus rotated to perform the edge cutting with the improvement material having been injected, so that a failure in recovering the rod due to jamming can be prevented.SELECTED DRAWING: Figure 5B