| 摘要 |
PURPOSE:To increase the bearing capacity of a custom-made pile by forming a spherical foot on the tip end of the pile by a method in which a custom-made hollow pile is penetrated to a given depth, the ground below the pile is excavated in a wire range while charging a round hardener, and the pile is further penetrated. CONSTITUTION:While the ground is excavated by an earth auger 3, a custom- made pile having a large-diameter tip 1a is penetrated to a given depth. While a high-pressure jetting device 4 on the tip of the auger 3 is deeply inserted into the tip of the pile 1, the ground is excavated while jetting a round hardener over a wide range by the device 4. Afterwards, the device 4 is pulled up, and the tip 1a of the pile 1 is allowed to settle to the middle of the hardener 5 while the hardener 5 is in unhardened state. Since a spherical foot is formed on then tip of the pipe 1, the pile footing having great bearing capacity can thus be obtained.
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