| 摘要 |
PURPOSE:To improve working properties, by a method wherein, after concrete is placed in an excavated hole, a low-strength curing layer is formed in a region above a designed pile head, and after concrete is set, the low-strength set layer is removed together with a ground therearound. CONSTITUTION:After concrete 2 is deposited in an excavated hole 1, an implanting pipe 11 is inserted into an extra-banking part 4 before the concrete is set. A setting agent solution for a ground is injected into an area consisting of a stabilizer 12 and a non-good quality of concrete 13, positioned above a planning pile head 5, through the injection pipe 11 to form a low-strength set layer 14 of non-concrete material. After the concrete 2 is set, the low-strength set layer 14 is removed togetherwith a ground material 3 therearound by an excavating means to complete a disposition of pile-heads. This permits the reduction in the number of working stages through elimination of a refilling work. |
