| 摘要 |
PROBLEM TO BE SOLVED: To increase a vertical load and a pulling out force to be burdened by one pile by transmitting a shearing force to support ground from an upper face and a lower face of a projection of a ready-made pile and forming a support face on the support ground on a circular cone bottom face to obtain a high vertical support force and a high horizontal support force in a well-balanced condition. SOLUTION: (1) A pile hole of a shaft part (hole diameter D00) 2 and an expanded bottom part (hole diameter D11) 3 is digged (a). (2) A concrete ready-made pile (shaft diameter D0) 4 forming annular ribs (outside diameter D1) 5, 6, 7 in a lower end part is lowered into the pile hole 1 to pour cement milk (solidifying strength of about 100 to 300 kg/cm2 corresponding to the strength of the support ground) therein. (3) After the cement milk is solidified, a pile 10 in which the ready-made pipe 4 is buried into the expanded bottom part 3 of the pile hole 1 is constructed (b). The annular ribs 5, 6 are arranged in the expanded bottom part 3 of the pile hole 1. (4) When a vertical load acts on the ready-made pile 4, a shearing force is transmitted at peripheral fringes of the annular ribs 5, 6 of the ready-made pile 4 to generate a support pressure in a part equivalent to the circular cone bottom face on a support ground face 11 (c).
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