| 摘要 |
PURPOSE:To improve working efficiency, by a method wherein the discharge port of an underwater pump is coupled directly to an injection nozzle, and the pump is driven in a condition in that the suction port of the pump fronts on the interior of processing water above concrete for an extra-banking portion. CONSTITUTION:Reinforcing bars 4 are arranged in a condition to fill the interior of a pile hole 1 with processing water 3 and concrete 6 is placed in the pile hole including an extra-banking portion 5. Before the concrete 6 for the extra- banking portion 5 is cured, an injection nozzle 9, directly coupled at a discharge port 8a with an underwater pump 8, is inserted into the extra-banking portion 5, and the open end of a hose 10 coupled to a suction port 8b is caused to always face on the interior of the processing water 3 above the extra-banking portion 5. Thereafter, the nozzle 9 is rotated by a rotating device 12, and the processing water 3 is injected through the nozzle 9 by means of the hose 10 with the aid of the pump 8 to bring the extra-banking portion 5 into a brittle state. |
