| 摘要 |
PURPOSE:To make easier the drawing of pile by a method in which a specific casing driven over the whole length of the periphery of an existing pile is pulled out of the ground under the condition that the existing pile is being held, and then the existing pile is separated. CONSTITUTION:A ceiling plate 3 and an air supply and exhaust port 4 near the ceiling plate 3 are provided at the upper end portion of a steel pipe 2 of a diameter and a length slightly larger those of an existing pile 1. Then, a small-diameter pipe 6 having an opening between the air supply and exhaust port 4 and a tapered opening 5 at the lower end is fixed to connect flexible pipes 9 and 10 for making up a casing A. Air is discharged from the port 4, the casing A is driven along the periphery of the pile 1 by means of a vibro-pile driver C, the port 4 is closed, compressed air is supplied into the pipe 6 by a compressor 11, the casing A holding the pile A is drawn out by the pile driver C and a crane B, and then the casing A is vibrated and compressed air is injected from the port 4 to pull out the pile 1. |
