| 摘要 |
PURPOSE:To enable concentration agent to efficiently creep to the outer periphery of a pile, by injecting the concreting agent to the lower section of a head and pressing the pile in after the pile is inserted into ground to a specified depth and after the concreting agent is injected on the periphery of the section of a pile lower-end and the excavating head which are butted to each other. CONSTITUTION:An earth auger 3 inverted through a hollow pile 1 is rotated, and at the same time, in ground, between a head 2 at the lower end of the earth auger 3 and the pile 1, the space l of approx. 50-100cm is kept; then, the pile 1 is inserted in ground to a specified depth. From the tip of the head 2, the concerting agent (a) of cement milk or the like is injected, and the agent is made to creep to the space l. After that, the tip of the pile 1 is butted to the head 2, and after that, from the tip of the head 2, the concreting agent (a) is injected, and the pile 1 is further pressed in. As a result, the concreting agent (a) is not infiltrated into the pile 1 through the section of the tip of the pile 1 and the head 2 which are butted to each other, and the concreting agent (a) can creep to the outer periphery of the pile 1.
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