| 摘要 |
PROBLEM TO BE SOLVED: To exert high vertical support force and high horizontal support force in a well-balanced manner by applying bearing pressure to the support ground from the lower surfaces of protrusions of a prefabricated pile and thereby increasing a vertical load to be borne by the one prefabricated pile. SOLUTION: A pile hole 1 comprising a shaft part 2 and an expanded bottom part 3 is excavated (a). A lower pile 32 is configured by forming circular ribs 5, 6 around the lower shaft part of the lower end part and by forming a large-diameter upper shaft part 43 which continues from the upper surface 6c of the circular rib 6 at the upper most level, and an upper pile 30 is connected to the lower pile 32, so as to form the prefabricated pile 4 (b), (c), (d). The prefabricated pile 4 is lowered through the pile hole 1 (b), (c) of which expanded bottom part 3 cement milk (solidification strength thereof is approximately 100-300 kg/cm<SP>2</SP>corresponding to strength of the support ground) is poured into. After the cement milk is solidified, a pile structure 10 wherein the prefabricated pile 4 is embedded in the expanded bottom part 3 of the pile hole 1, is built (d). The circular rib 5 and the lower surface 6a of the circular rib 6 are located in the expanded bottom part 3 in the pile hole 1. COPYRIGHT: (C)2011,JPO&INPIT
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