| 摘要 |
PURPOSE:To raise the dredging forces by a method in which a pathway for high-pressure water is provided along the axis of a nozzle head body, a jet pathway is radially formed toward a jet nozzle provided in the back slope face from the pathway, and an air-liquid mixing chamber is provided on the way of the pathway. CONSTITUTION:High-pressure water is sent through a hose to a cleaner S and jetted from a jet nozzle 6 through a high-pressure water-introducing pathway 2, whereupon the cleaner S advances by itself in tubes to dredge deposit soil and to allow it to flow the downstream side. When the cleaner S reaches the upstream end of tube, compressed air is sent with high-pressure water by a compressed air hose. The compressed air is mixed with the high-pressure water in an air-liquid mixing chamber 5 and jetted from the nozzle 6 through the hole 8c of a mouth metal 8. When the high-pressure water hose is wound up and the cleaner S is moved to the downstream side, solidified soil in the tube is dredged by the air-liquid mixed jet flow and directed to the downstream side. |
