| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method for a concrete pile having a spiral protrusion by which a prestressed introduction concrete pile having the spiral protrusion made of concrete can easily be manufactured without using a steel fiber. SOLUTION: Concrete is thrown into a mold in which prestressed PC steel bars or reinforcement rods are arranged, and centrifugally molded. After curing for a specified period of time, a prestressed amount of a degree by which cracks may not occur on the spiral protrusion made of concrete or the surroundings at the time of prestressed introduction or demolding is imparted, and then, demolding is performed for this manufacturing method for the concrete pile having the spiral protrusion made of concrete. COPYRIGHT: (C)2006,JPO&NCIPI
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