| 摘要 |
PROBLEM TO BE SOLVED: To provide a jet nozzle device capable of securely operating a reverse injection mechanism when certain loads are applied to a socket and a nozzle body and to provide its control means. SOLUTION: This jet nozzle device is composed of the nozzle body 30 having an injection port 23 and a passage 31 for jet water and having a reverse injection port 32 communicating with the passage 31 in a section different from the injection port 23 and opened outward and the cylindrical socket 20 for attaching the nozzle body 30. A channel 21 is constituted by matching it with an opening part of the reverse injection port 32 on the inner peripheral face of the socket 20. A socket injection port 33 communicating with the channel 21 is constituted. When attaching the socket 20 to a pile 10, the socket injection port 33 is closed by the pile 10, and the socket injection port 33 is opened when the socket 20 drops from the pile 10 to inject jet water. At the same time, an amount of the discharge water of a pump 50 is kept at a proper amount by a pressure sensor 52 for detecting the reduction of the discharge pressure of the pump 50 and a control part 53. COPYRIGHT: (C)2006,JPO&NCIPI
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