| 摘要 |
PROBLEM TO BE SOLVED: To provide a precast concrete pile capable of easily forming ring-like protrusions in the inner circumference of a pile end part such as a pipe head part without having to complicate manufacturing processes nor increase the number of members. SOLUTION: The precast concrete pile has the ring-like protrusions 21 in the inner circumference of a pipe end part such as a pipe head part 10a along its circumferential direction. In a ring-like protrusions 21, a ring-like member 21a provided with a spring force in a diameter-expanding direction is fixed to the inner circumference of the pipe head part 10a by the spring force and formed. The ring-like member 21a is a member having two free end parts at parts of its circumferential direction and capable of reducing its diameter and is provided with a spring force by a reduction in its diameter. COPYRIGHT: (C)2010,JPO&INPIT
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