PILE EMBEDDING METHOD BY INNER EXCAVATION CONSTRUCTION METHOD

摘要

PROBLEM TO BE SOLVED: To provide a pile embedding method by an inner excavation construction method using a PC pile capable of enlarging the diameter of an expanded bulb under the pile lower end larger than a conventional diameter. SOLUTION: An expanded bulb forming part E having a radius larger than a turning radius of an expanded excavation blade 10 is formed by projecting the expanded excavation blade 10 in the auger radial direction by reversely rotating an excavation head A, and lifting the expanded excavation blade while injecting excavation water under high pressure from a nozzle of its tip by precedently excavating up to the bottom of an expanded bulb forming position while normally rotating the excavation head A stored inside in a state of inserting the PC pile C up to this side D5 of the expanded bulb forming position, by using the expanded excavation blade 10 stored inside the outer diameter of a spiral auger by normally rotating and projecting outside the outer diameter of the spiral auger by reversely rotating and the excavation head A having the nozzle injecting liquid outside the outer diameter of the spiral auger at the tip part its expanded excavation blade 10. COPYRIGHT: (C)2007,JPO&INPIT