Pile foundation

Abstract

The present invention relates to a pile foundation including: a pile that extends in a vertical direction, and whose pile head protrudes above the ground, and that supports a tower-type structure, and ribs that are provided at the pile in a vicinity of a surface of the ground, and that protrude outwardly in radial directions from an outer circumferential surface of the pile.

1 . A pile foundation comprising:
 a pile that extends in a vertical direction, that has a pile head protruding above the ground, and that supports a tower-type structure; and   ribs that are provided at the pile in a vicinity of a surface of the ground, and that protrude outwardly in radial directions from an outer circumferential surface of the pile.   
     
     
         2 . The pile foundation according to  claim 1 , wherein a plurality of the ribs are provided at equidistant intervals in a circumferential direction of the pile. 
     
     
         3 . The pile foundation according to  claim 1 , wherein upper end portions of the ribs are positioned on a lower side of the surface of the ground. 
     
     
         4 . The pile foundation according to  claim 1 , wherein:
 the pile is formed by a steel pipe, and   the ribs are formed from a steel material.   
     
     
         5 . The pile foundation according to  claim 1 , wherein the tower-type structure forms a leg portion of a wind power generator. 
     
     
         6 . The pile foundation according to  claim 1 , wherein:
 the pile is formed in a tubular shape, and   internal ribs that protrude inwardly in radial directions from an inner circumferential surface of a portion of the pile that is embedded in the ground are provided.