In the inner skin of Tip side of the internal projected part equipped ready-made

摘要

PROBLEM TO BE SOLVED: To enable formation of protrusions on an inner peripheral surface of a ready-made concrete pile by means of centrifugal force molding to integrate a front end part of the pile with a bulb.;SOLUTION: In the concrete pile, a part of a ring-like fixing material 8 buried in the concrete 5 of a pile body 2 is protruded from the inner peripheral surface to the inner periphery of the pile body 2, by which protrusions 7 are formed on the inner peripheral surface of the front end side of the pile body 2.;COPYRIGHT: (C)2007,JPO&INPIT