| 摘要 |
PROBLEM TO BE SOLVED: To provide a rotary press-in steel pipe pile that can be manufactured to suit a purpose owing to replaceable excavating blades depending on the soil of ground, and can be unconventionally reduced in diameter owing to two or more plate spirals that reliably bite in ground, increase pulling strength and increase earthquake resistance. SOLUTION: A tip end of the steel pipe pile has two or more plate spirals each having a plurality of excavating blades at a tip of a spiral plate. COPYRIGHT: (C)2004,JPO
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