| 摘要 |
PURPOSE:To improve the quality of a pile, by a method wherein an inner pipe is vertically movably supported to a casing, and a boring device is pulled off as a curing material is poured in the casing in a state in that the lower end of the inner pipe is retracted into the casing. CONSTITUTION:With a hydraulic cylinder 27 contracted, a casing 11 and an inner pipe 12 are secured and are set to the core of a pile to ascertain perpendicularity. The casing 11 is rotated, and a press force is exerted to sink the casing 11 to a given depth. The casing 11 is secured, a curing material 2, such as mortar, is poured with a pressure through the tip of the inner pipe 12, and the inner pipe 12 is lifted up by length equal to an amount of a curing material 2 poured. Thereafter, a given amount of the curing material 2 is continuously poured in a similar manner described above. |
