| 摘要 |
PURPOSE:To draw out bent piles under ground with a minimum amount of excavation by a method in which by a casing for excavating annular holes connected with a flexible diagonal coupler, large numbers of short tubes with an inside diameter slightly larger than the outside diameter of the pile under ground are connected toward the axial line. CONSTITUTION:By a casing 1 for excavating annular holes, a large number of short tubes with an inside diameter slightly larger than the outside diameter of an underground pile 18 are orderly connected with a flexible diagonal coupler 3 toward the axial line direction, where an excavating blade 4 is provided at the lower end of the opening and a spiral blade 5 for discharging excavated soil is also provided on the outside face. An excavating liquid is supplied through a liquid path 6 provided in the casing 1 to near the excavating blade 4, and the casing 1 is penetrated into the ground by a driver 17 in such a way as to encase the underground pile 18 into the casing 1 from the lower end opening of the casing 1. The underground pile 18 is pulled out by a wire 19 and then the casing 1 left in the ground is drawn out by the driver 17. |
