PILE CUTTING DEVICE, PILE EXTRACTION METHOD USING PILE CUTTING DEVICE

摘要

To provide a pile cutting device and a pile extraction method which extracts a heavy existing pile safely.SOLUTION: A pile cutting device 10 for cutting an existing pile P comprises: a cylindrical device body 3 provided with a first outside cylindrical portion 4 concentrically; first driving devices 8(8a,8b) making the first outside cylindrical portion 4 move along the device body 3; and cutting bits 9a,9b. The first driving devices 8(8a,8b) make the first outside cylindrical portion 4 move along the device body 3, thus the cutting bits 9a,9b are made to stand up at a sectional center side of the device body 3, or to fall down to an inner peripheral wall 3N side of the device body 3.SELECTED DRAWING: Figure 2