PURPOSE: To provide a driving method of foundation piles by which the whole or a part of a liquid-feed means can be easily recovered and piles can be precise ly pressed in and driven as far as a specified underground level in a specified direction, while a merit of a rotary pressing machine for driving a pile or the merit that the upper space of construction site may be relatively narrow, is utilized as it is.
CONSTITUTION: A ground-excavating shoe 4 is fixed at the lower end of the first precast pile 1 in two precast piles 1 to constitute foundation piles and a liquid-feed pipe 2 is connected to the shoe through the inside space of the precast pile. The first precast pile is pressed in the ground L, while it is held by a rotary pressing machine 5 at the outer periphery and rotated. After the first precast pile has been driven to a specified underground level, the second pile 1 is connected to the first pile 1 pressed in previously and also the liquid- feed pipe is additionally joined and extended and pressed in by the rotary pressing machine. After the precast piles have been pressed in a specified underground level, the liquid-feed pipe is detached at a predetermined position, from a joint 21 installed in advance there. Thus the upper part thereabove is recovered.
OIWA TADAO
SUMI KOJI
GEOTOP CORP
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