| 摘要 |
PURPOSE:To decrease a construction cost, by a method wherein a mixture layer of cement milk and soil is formed in a vertical shaft, and after an excavation securing layer containing bentonite and soil is formed thereon, a pile provided at the lower end with an enlarged part is penetrated into the vertical shaft and is buried by rotation. CONSTITUTION:An excavation securing layer 11 is formed through excavation of a ground as a securing solution, in which bentonite and water are mixed together, is injected through the forward end of an auger. Thereafter, after a ground is excavated down to a depth arrested by a support ground A, an auger is lifted as, instead of the solidifying solution, cement milk is poured, and a cement milk mixture layer 12 is formed to the lower part of the securing layer 11. Thereafter, a concrete pile 10 is penetrated into a vertical shaft 5 as the pile is rotated, and an enlarged part 10b is forcibly pressed in the mixture layer 12. |
