| 摘要 |
PROBLEM TO BE SOLVED: To provide a concrete pile hole excavation method capable of being reused without the removal of the excavated surplus soil on the ground by excavating a pile hole 15 for burying a precast pile or cast-in-place concrete piles 14 and 14' to carry out consolidation fixation of the excavated soil to a hole wall 11 and without burying an excavator. SOLUTION: The concrete pipe hole excavation method is so constituted that a central cutting blade 4 provided on a disc 3 detachably put on the lower surface of the bottom plate 2 of a round steel pipe 1 and the outside ends 5" of a plurality of symmetrical curved cutting blades 5 and 5 provided to symmetrical positions of the outside are projected on the outside from the outer circumference of the disc 3, downward cutting blades are provided on the outside ends 5" of the curved cutting blades 5 and 5, the lower ends of a supply pipe 8 are connected to the bottom plate 2 and the disc 3, a degassing trench 9 is formed in the outer circumference of the disc 3 and that the excavated soil or scrap excavated by the cutting blades 5 and 5 and led to the outside of the disc 3 by the curved cutting blades 5 and 5 is consolidated to the hole wall 11. COPYRIGHT: (C)2004,JPO
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