| 摘要 |
PURPOSE:To strongly fix a pile by a method in which an opening-and closing ring is hung down into an outer tube under a state that legs are closed, the ring is penetrated into the outer tube until the legs are extended from the window of the outer tube to the outside, and concrete is poured into the outer tube. CONSTITUTION:An opening and closing ring 7 is attached to the front end 13a of a lever 13 and integrated by thrusting a shear pin 12 through them. Legs 10 are hung down into an outer tube 1 driven under the ground and radially extended under the guidance of the guide plate 4 of the tube 1. The pin 12 is sheared by pushing force of the lever 13, the ring 7 is pressed down by the front end 13a of the lever 13, and the legs 10 are extended from the leg window 3 to the outside of the tube 1. The lever 13 is drawn out, and concrete is poured into the tube 1, whereupon the concrete flows out through the window 3, goes toward the region S along the legs 10, and hardens. |
