Precast concrete pile as well as the structure of the foundation piles and buried method of precast concrete pile

摘要

PROBLEM TO BE SOLVED: To increase vertical load to be burdened by one pile by propagating shearing force to support ground from a lower face of a protrusion of an existing pile and forming a support face on the support ground by a conical bottom face. ;SOLUTION: Pile holes of a shaft part (hole diameter D₀₀) 2 and a bottom expansion part (hole diameter D₁₁) 3 are digged (a). An existing concrete pile (shaft diameter D₀) 4 forming annular ribs (outside diameter D₁) 5, 6, 7 in a lower end part thereof is lowered into the pile hole 1, and cement milk (solidification strength of about 100 to 400 Kg/cm² corresponding to the strength of support ground) is poured therein. After cement milk is solidified, a pile 10 in which the existing pile 4 is embedded into the bottom expansion part 3 of the pile hole 1 is constructed (b). The annular ribs 5, 6 are arranged in the bottom expansion part of the pile hole 1. When vertical load acts on the existing pile 4, shearing force is propagated at peripheral fringes of the annular ribs 5, 6 of the existing pile 4, and support pressure is generated in a part corresponding to a conical bottom face on a support ground surface 11.;COPYRIGHT: (C)1999,JPO