無排土型場所打ちコンクリート杭の開発

抄録

The authors have developed a No-soil-discharge cast-in-place concrete pile method. The working steps of the method are as follows,
1) Soil is loosened and pushed into surrounding soil by special drilling tool.
2) When the tool reaches the final depth, the tool is extracted and concrete is pumped through the hollow stem of the tool.
3) Installation of reinforcement cage into the fresh concrete.
So the method reduces digging soil and performs high bearing capacity compared with previous methods. This paper reports an outline of the construction method and results of field tests.