| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a foot protection method of a rotary penetration pile capable of forming uniform foot protection by sufficiently agitating and mixing excavated sediment and a hardening fluid.SOLUTION: A foundation pile comprises a steel pipe pile body 11 having the tip blocked up by a bottom cover 12, a steel spiral blade 13 of a substantially one roll provided on an outer peripheral surface in the vicinity of a tip part of this pile body 11 and a hardening fluid jetting port 14 provided on the outer peripheral surface positioned between the starting end and the tail end of this spiral blade 13, and in the spiral blade 13, two long holes 18 are respectively formed in mutually substantially opposed places around the pile body 11. When the pile body 11 is vertically moved while rotating in the ground, the sediment existing in the vicinity of the spiral blade 13 flows to the other surface side (the reverse surface side) from one surface side (the surface side) of the spiral blade 13 or to the one surface side from the other surface side by passing through the long holes 18.</p> |
