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    • 7. 发明专利
    • HIGH PRESSURE WATER JET BORING METHOD AND DEVICE THEREOF
    • JPH09256767A
    • 1997-09-30
    • JP6347096
    • 1996-03-19
    • MITSUI SHIPBUILDING ENG
    • NAKAYAMA MAREWATANABE TAKEOMATSUNUMA KOJI
    • E21B7/18
    • PROBLEM TO BE SOLVED: To buffer mutual interference to promote earth-moving efficiency and boring efficiency by using a triple pipe to form a circular separation belt area between jet stream of high pressure water and moving-soil flowing in the opposite direction in a high pressure water jet boring device. SOLUTION: A triple 3 is borne through a triple pipe swivel joint 2 fixed to a drifter shunk rod 1 transferring power from a rotational device. The triple pipe 3 is formed of an exterior pipe 5 having a bit 4 on the front end, an intermediate pipe fixing a nozzle 8 to the inside by a certain distance L from the front end of the exterior pipe 5 and an interior pipe 7. High pressure water a from the swivel joint 2 is jetted from a hole 8b through the interior pipe 7, low pressure water or compressed air b is jetted from the hole 8b through the intermediate pipe 6, and excavated soil c is moved to the outside through the exterior pipe 5. Accordingly, a circular separation belt area K is formed between a layer c' of the moving-soil c and a layer a' of the high pressure water a to lessen energy loss caused by mutual interference, and earth-moving efficiency and boring efficiency can be promoted.