| 摘要 |
PROBLEM TO BE SOLVED: To provide an improved simple structure of steel pipe pile lead end used for pile installation by inner excavation, the structure being simple and smoothly transmitting upper loads to a foundation consolidation bulb. SOLUTION: Regarding a steel pipe pile for forming a foundation consolidation bulb 7 by injecting cement milk into the pile lead end having reached the support layer 2 of ground 5 in pile installation by inner excavation, in the lead end of a steel pipe pile 11, the pile lead end protrusion 14 protruding inwardly and outwardly from the pipe wall is formed in a circumferential direction. Also the steel pipe pile 11 has a plurality of circumferentially extending inner protrusion steps 101 from its inner pipe wall surface over an area from its leading end upward, having the upper part 7a of foundation consolidation bulb formed there, to constitute the transmission of loads 12 from the pile body to the foundation consolidation bulb 7. COPYRIGHT: (C)2006,JPO&NCIPI
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