| 摘要 |
PROBLEM TO BE SOLVED: To provide a rotary penetration steel pipe pile easily machinable, supporting a large load, and having excellent penetration efficiency. SOLUTION: In this rotary penetration steel pipe pile, a steel blade 3 formed by bending a flat plate is secured to the front end face of a steel pipe at right angle to the axial direction of the steel pipe 5. In the steel blade 3, a slit 7 is formed within a predetermined area so as to extend along the front end outer periphery of the steel pipe 5, a cutoff part 9 is formed by cutting off a predetermined area including the slit 7 in a fan shape, an upward tilted surface part 13 is formed by upwardly bending one side of the portion of the steel blade at which the slit 7 is formed through, as a bending line 11, the extension of the segment connecting each terminal 7a of the slit 7 and the center of the pile, and a downward tilted surface part 15 is formed by downwardly bending the other side of the portion at which the slit 7 is formed. The cross sections of the tilted parts and the non-tilted parts of the upward tilted surface part 13 and the downward tilted surface part 15 at the slit portion are joined to each other by welding. COPYRIGHT: (C)2011,JPO&INPIT
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