| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for protecting a hole wall and boring a pile hole for a cast-in-place pile simultaneously in parallel. <P>SOLUTION: An inventive method includes: connecting a plurality of cylindrical pipes (14) together, each of which has a diameter smaller than that of a pile hole and a length equal to or smaller than the depth of a bored part, and dropping them along a hole wall (15) simultaneously in parallel with boring the pile hole for a cast-in-place pile; and filling a back-fill material (16) in a clearance between the hole wall and the cylindrical pipes to bring the pipes into close contact with the wall. On the periphery of the tip of the lowermost cylindrical pipe, a seal material is attached, which is in contact with the hole wall when dropping the pipes and thus prevents the back-fill material from escaping. <P>COPYRIGHT: (C)2012,JPO&INPIT |
