| 摘要 |
PROBLEM TO BE SOLVED: To eliminate the fear that a jet nozzle for pile driving may be disconnected midway the pile driving, to endure particularly the work for driving a pile by vibrations, and to enable the jet nozzle to be surely recovered and reused, by improving the jet nozzle for driving the pile. SOLUTION: A valve body (6) in which a valve spool (7) is housed, which functions as the jet nozzle, is fitted to the tip of a high-pressure water supply hose (not shown in the figure), and a cup-shaped valve body holder (5) into which the tip of the valve body (6) can be inserted is welded to the pile (1). A ratchet-shaped bite (12), which can protrude/recede, is elastically supported on the side surface of the valve body (6), and fitted into a window-shaped opening (5b) which is provided in the side wall of the holder (5). The bite (12), which serves to prevent the disconnection of the valve body (6), enables the valve body (6) to be pulled out by cutting off an upper part (5c) of an opening, when receiving a strong pull-out force. COPYRIGHT: (C)2004,JPO
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