| 摘要 |
PURPOSE:To increase the bearing strength of the side of a foundation pile to be set thereafter by a method in which a warped compressive excavating blade is attached to the lower disc of a steel tube in relation to the normal rotation direction of the rotary shaft and excavated soil is pressed into the surrounding natural ground. CONSTITUTION:A backwardly warped compressive excavating blade 5 is attached to the lower disc 2 of a steel tube 9 in relation to the normal rotation direction of a rotary shaft 1. The ground is excavated by normally turning a central blade 3 and the blade 5, and compressed air or a fluid or water containing cement is jetted from a nozzle 4. The free rise of the excavated soil is suppressed by the tube 9, and in a compressible ground, most of excavated soil is pressed into the surrounding ground by the radial pressures of the blade 5. Also, in a less-compressible ground, the excavated soil is partly pressed into the surrounding ground in the same way. The bearing strength of the side of the foundation pile to be set thereafter can thus be increased.
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