CAST-IN-PLACE CONCRETE PILE CONSTRUCTION METHOD AND CAST-IN-PLACE CONCRETE PILE

摘要

To provide a cast-in-place concrete pile construction method capable of more efficiently and effectively improving the bearing strength than conventional ones, and a cast-in-place concrete pile.SOLUTION: The cast-in-place concrete pile construction method includes the steps of: forming an excavation hole 10 in a shaft 2 to a predetermined depth of the ground G using a bottom-excavating excavator 5 by performing pre-drilling; inserting the bottom-excavating excavator 5 for a shaft having a smaller diameter than the drilling hole 10 of the shaft 2 into the tip edge of the drilling hole 10 of the shaft 2; disposing the center axis O2 of the bottom-excavating excavator 5 being displaced by a predetermined amount with respect to the center axis O1 of the shaft part 2; and forming a drilling hole 11 in the bottom expansion part 3 by performing trailing drilling to expand the hole wall of the tip edge of the drilling hole 10 of the shaft 2 formed by the previous excavation with the bottom-excavating excavator 5.SELECTED DRAWING: Figure 1