PROBLEM TO BE SOLVED: To enhance removal efficiency of slime that tends to sink to the hole bottom of a drilled hole in a construction method for a cast-in-place concrete pile.;SOLUTION: A tremie pipe 4 is disposed on the inner peripheral side of a steel bar basket 3, and a convection pipe 5 is disposed near a hole wall 2a on the outer peripheral side of the steel bar basket 3. Each of the tip ends is inserted up to a depth in which they reach or approach a hole bottom 2b. Prior to installation of concrete 9 via the tremie pipe 4, stable solution 1 inside or outside a drilled hole 2 is suctioned so that it is discharged from an axis-directional tip of either the convection pipe 5 or the tremie pipe 4, while the stable solution 1 is suctioned from the other one of the axis-directional tips so that it is returned into the drilled hole 2, and slime in the stable solution 1 is removed while the stable solution 1, which is present around the hole bottom 2b of the hole wall 2, is forced to circulate.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2018,JPO&INPIT
展开▼
