| 摘要 |
PCT No. PCT/NL92/00214 Sec. 371 Date Jul. 16, 1993 Sec. 102(e) Date Jul. 16, 1993 PCT Filed Nov. 20, 1992 PCT Pub. No. WO93/09880 PCT Pub. Date May 27, 1993.A jet lance device comprising a hydraulic crane with an articulated jib movable by hydraulic motors, a hydraulic rotator mounted on the free end of the jib such that a rotatable support element thereof is turnable about an axis in the vertical plane through the jib, and a jet member mounted on the support element. This jet member comprises a jet lance which is pivotable on a pivot axis transverely of the rotation axis of the rotator and connectable to a source of jet liquid under high pressure, and the device further comprises controllers and drivers for operating the device.
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