FOUNDATION PILE ENABLING PREVENTION OF LIQUEFACTION OF SANDY GROUND AND LIQUEFACTION PREVENTIVE METHOD OF SANDY GROUND BY FOUNDATION PILE ENABLING PREVENTION OF LIQUEFACTION OF SANDY GROUND AND MANUFACTURE OF FOUNDATION PILE ENABLING PREVENTION OF LIQUEFACTION OF SANDY GROUND

摘要

PROBLEM TO BE SOLVED: To prevent the liquefaction of a sandy ground by boring a large number of small- diameter through-holes between the external surface and hollow section of a foundation pile body and disposing a raw material, through which air and water can pass, into the through-holes. ;SOLUTION: A large number of through-holes 6 are bored to a raw material made of a metal plate at desired intervals, and abutting sections are welded by rolling and foundation piles 2 having desired diameters are formed. Hollow sections 7 are formed at central sections, the hollow sections 7 are directed in the axial direction of a foundation pile body, and the upper ends of the hollow sections 7 are opened. A large number of the small-diameter through- holes 6 are bored among the surfaces of the foundation pile bodies such as a steel pipe and the hollow sections 7 of the foundation pile bodies, the intrusion of sand from these through- holes 6 is interrupted, and nonwoven fabrics 12 as raw materials, through which air and water can pass, are disposed inside the through-holes 6. Excess pore water in soil flows into the hollow sections and the rise of water pressure is inhibited while water is flowed out to the outside from the upper-end opening sections of the hollow sections at the time of an earthquake, etc.;COPYRIGHT: (C)1997,JPO