| 摘要 |
PROBLEM TO BE SOLVED: To prevent pulling-together of a ready-made pile during pulling working of a easing by connecting an auger screw and the buried ready-made pile by a connection fitting and holding the ready-made pile during the pulling of the easing. SOLUTION: After drilling is performed by an auger screw, each drive device of an auger and a easing ascends while the easing 41 is removed from a easing drive device 4 and pile circumferential fixing fluid or the like is injected in a drilled hole. A ready-made pile is buried in the drilled hole to connect the auger screw and the buried ready-made pile by a connection fitting 32. The positioned easing 41 is locked with a easing locking tool 4a, and pulling is performed while the easing 41 is rotated. At the time, pulling-together of the ready-made pile is prevented by holding of the auger screw, and rotation is performed in the contrary direction to the casing 41 by execution soil quality. Thus friction resistance between the casing 41 and the ready-made pile is eliminated, straightness of the ready-made pile is held as soon as the casing 41 is smoothly pulled, and burying is performed precisely.
|
