Patent ID: 6540444
Filing Date: 2003-04-01
Classification: E02D

Abstract:
A rotating pile for undergrounding, comprising:a pile-head pipe including a longitudinal center line, a pipe wall, one end portion having a tip end, and the other end portion opposed to the one end portion, the one end portion provided with three or four recessed portions formed in the pipe wall, wherein each recessed portion extends along the longitudinal center line, is recessed toward the longitudinal center line, and is inclined inward toward the longitudinal center line as the recessed portion approaches the tip end to substantially close the one end portion, the one end portion being further provided with blades formed of the pipe wall between the adjacent recessed portions, the number of blades being equal to the number of recessed portions, each blade projecting radially outward from the longitudinal center line, wherein a size of each blade gradually expands in a circumferential direction as each blade extends from the tip end toward the other end portion, and wherein a radially outward most region of each blade projects further in a direction along the longitudinal center line than a region of each blade located in the vicinity of the longitudinal center line.