| 摘要 |
PROBLEM TO BE SOLVED: To provide a steel pipe with the bottom widened and a construction method for the steel pipe with the bottom widened which can reduce the disturbance to the peripheral ground at the tip of pile, secure a great bearing force and suppress the initial settlement. SOLUTION: A hollow-shaped small-diameter steel pipe 1 and a supporting blade 2' with the bottom widened provided by enlarging from the outer peripheral surface of the small- diameter steel pipe 1 to the outward are equipped, and the supporting blade 2' with bottom widened has a small diameter at the upper edge portion 2a' and has a steel pipe A with bottom widened, the diameter larger at the bottom edge portion 2b' formed to a circular truncated cone shape. Also, the supporting blade with bottom widened and the small steel pipe 1 are jointed relative to the center shaft of the small diameter steel pipe 1 with a reinforcing member 3' installed with a slope. Moreover, at the lower end of the small diameter steel pipe 1, the cutting blade 4' is protruded downward, and a soil removal hole 5' is provided between the upper edge portion 2a' and the small diameter steel pipe 1. Also, at a predetermined position in the target ground, the steel pipe pile with bottom widened constituted by attaching the steel pipe with bottom widened A to the tip of the pile main body steel pipe is used for building the pile body by merely pressuring or penetration by rotation and pressuring.
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