Foundation pile

Abstract

A foundation pile 1 is disclosed. The foundation pile 1 includes a central axis member 10 that extends vertically in the up-down direction; a base plate 11 formed on the upper end of the central axis member 10 to fix the upper structure 2 at the upper end; and a circumferential member 20 provided on the upper side circumference of the central axis member 10 to reinforce the upper side circumference of the central axis member 10 , wherein the upper surface of the circumferential member 20 is formed so as to come into contact with the lower surface of the base plate 11 without any gap.

1 . A foundation pile comprising:
 a central axis member ( 10 ) that extends vertically in the up-down direction;   a base plate ( 11 ) formed on the upper end of the central axis member ( 10 ) to fix the upper structure ( 2 ) at the upper end; and   a circumferential member ( 20 ) provided on the upper side circumference of the central axis member ( 10 ) to reinforce the upper side circumference of the central axis member ( 10 ),   wherein the upper surface of the circumferential member ( 20 ) is formed so as to come into contact with the lower surface of the base plate ( 11 ) without any gap.   
     
     
         2 . The foundation pile according to  claim 1 ,
 further comprising a plurality of reinforcing wings joined to the central axis member ( 10 ) and the circumferential member ( 20 ),   wherein the plurality of reinforcing wings comprises,   one or more lower end reinforcing wings ( 41 ) joined to the lower end of the central axis member ( 10 ),   a plurality of intermediate reinforcing wings ( 42 ) joined to the outer circumference of the central axis member ( 10 ), and   a plurality of upper reinforcing wings ( 43 ) or ( 43 A), ( 43 B) and ( 43 C) joined to the outer circumference of the circumferential member ( 20 ).   
     
     
         3 . The foundation pile according to  claim 1 ,
 further comprising an intermediate expansion reinforcing plate ( 50 ) that is joined to the outer circumferential surface of the circumferential member ( 20 ) so as to be spaced on the lower side from the base plate ( 11 ), and resists a vertical load while having a larger area than the base plate ( 11 ), wherein the foundation pile is installed so as to fill the ground of the burial hole ( 7 ) again after the intermediate expansion reinforcing plate ( 50 ) is driven into the pre-formed burial hole ( 7 ) until it comes into contact with the ground.   
     
     
         4 . The foundation pile according to  claim 3 , further comprising:
 a plurality of insert holes ( 52 ) formed in the intermediate expansion reinforcing plate ( 50 ), and   a plurality of auxiliary foundation piles ( 70 ) that are inserted into the insert hole ( 52 ) so that the upper ends are welded to the intermediate expansion reinforcing plate ( 50 ),   wherein the auxiliary foundation pile ( 70 ) comprises a base part ( 71 ) at the upper end which is welded to the intermediate expansion reinforcing plate ( 50 ), an axial part ( 72 ) which extends vertically downward from the lower surface of the base part ( 71 ), a reinforcing circumferential part ( 73 ) which is coupled to the axial part ( 72 ) so as to surround the upper part of the axial part ( 72 ), has a size smaller than the base part ( 71 ), and has an inner diameter corresponding to the insert hole ( 52 ).