| 摘要 |
PURPOSE:To reduce the amount of a fluid to be used as well as to accelerate the degradation of the ground by a method in which when jetting a fluid from nozzles annularly set at the lower end of a hollow pipe for sand pile formation, the jetting of the fluid from adjacent nozzles is made orderly at an interval of time for each group. CONSTITUTION:A hopper 2 and a penetrator 3 are attached to the upper end of a hollow pipe 1 for forming a sand pile, and jet nozzles 4 for a fluid are set annularly at a given interval at the lower end of the hollow pipe 1. In jetting a fluid from the nozzles 4, the order of the adjacent nozzles 4 participating in the jetting work of the fluid is changed at a given interval of time for each group of the nozzles 4 in such a way as to make it possible to change the order around the hollow pipe 1 as the center. Thus, an impaction effect can be effectuated at the beginning of the jetting of the fluid from each nozzle 4. |
