FOUNDATION PILE DRAWER AND UNDERSEA FOUNDATION PILE DRAWING-OUT METHOD

PURPOSE:To sharply reduce the working time for drawing out a foundation pile by setting the chucking widths of the chuck of a vibrohammer and the chuck of a spline joint to almost the same width as that of a foundation pile. CONSTITUTION:A hydraulic chuck 7 is arranged at the bottom of the vibrohammer hung by a crane, and a spline joint 10 is coupled freely of mounting and removal between the chuck 7 and a sheath 3 or a foundation pile. Moreover, a first reducer 12 set to the same width as the foundation pile is coupled freely of mounting and removal, and a spline joint chuck 14 is coupled integrally with the bottom of the spline joint 10. Furthermore, a second reducer 16 being set to the same diameter as the foundation pile is coupled freely of mounting and removal with the top of the sheath pipe 3. By constituting a drawer this way, time chucking widths of the chuck 7 of the vibrohammer 6 and the chuck 14 of the spline joint 10 are set to roughly the same width as the foundation pile being drawn out. Accordingly, the vibrohammer 6, the sheath pipe 3, the spline joint 10, and the foundation pile can be coupled easily.