| 摘要 |
PURPOSE:To increase the bearing force of pile by a method in which the ground is excavated by a bit attached to the top of a rotary shaft piercing the hollow part of a pile, and soil is mixed with a fluid by a stirring blade and raised along the outer periphery of the pile. CONSTITUTION:A shoe 5 with an angled steel bit 7 is attached to the tip of a rotary shaft 4 piercing the hollow part 3 of a pile 1. A stirring blade 13 to be expanded or contracted according to the turning direction of the shaft 4 is attached to the upside of the shoe 5 and a shutter consisting of rubber plates 22 and 23 to prevent the inflow of soil into the hollow 3 is also provided. Mud water injected through the shaft 4 is mixed with the excavated soil to form a cement hardened layer stronger than the original ground between the pile and the pit wall.
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