| 摘要 |
PROBLEM TO BE SOLVED: To meet the needs not to use bentonite and to reduce waste excavation soil volume in the pile driving work without vibrations and noises. SOLUTION: A small-diameter pile can be made to be comparable in support power to a large-diameter pile by the method which combines the primary excavation process to bore earth applying pressure to the bore hole wall with an oval screw in a sectional shape and a short head attached to its leading end, with the secondary excavation process to insert a prefabricated pile with a bottom expanding plate while revolving them and injecting cement milk. COPYRIGHT: (C)2006,JPO&NCIPI
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