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    • 6. 发明专利
    • ALL-CASING EXCAVATOR
    • JPH0860968A
    • 1996-03-05
    • JP19152194
    • 1994-08-15
    • MITSUBISHI HEAVY IND LTD
    • EGAWA KIKUJIKITAMURA YUZOMATOBA NOBUAKI
    • E21B4/16E21B4/18E21B7/20
    • PURPOSE: To enable construction time and cost to be both reduced by enabling even hard bedrock to be drilled efficiently. CONSTITUTION: Each outside mounting block 6 is mounted in the large-aperture position (or small-aperture position) of a connecting block 8, and the lower end of each outside mounting block 6 is connected by a connecting member 14 for large apertures (or connecting member 15 for small apertures). Then a gripper device 4 is operated by means of fluid pressure, and a ring-shaped hollowing excavation device is secured to a casing tube. Then the casing tube and the ring-shaped hollowing excavation device are driven into the ground while being rotated or rocked, and a ring-shaped hole is drilled in the center by operating using the fluid pressure a crushing impactor 5 mounted on the lower end of an inside mounting block 7, and by rotating and moving a cutter bit 16. Also, a ring-shaped hole of a large (or small) aperture is drilled around the ring-shaped hole in the center by operating using the fluid pressure the impacting crusher 5 mounted on the lower end of each outside mounting block 6, and by rotating and moving the cutter bit 16 mounted on the lower surface of the connecting member 14 for large apertures (or connecting member 15 for small apertures).
    • 7. 发明专利
    • BUCKET SELF-ELEVATION TYPE EXCAVATING DEVICE
    • JPH0726867A
    • 1995-01-27
    • JP17277293
    • 1993-07-13
    • KAJIMA CORP
    • SHIMAI MORIYUKIKAWADA MASATOSHIKIKUCHI TETSUKI
    • E21B4/18E21B7/20E21B11/00
    • PURPOSE:To separate propulsion of a casing and propulsion of bucket from each other by a method wherein an expanding contracting means to transmit a rotation force and increase and decrease a distance between a bucket device and a gripper device is located between the bucket device to excavate the interior of a casing and the gripper device to fix the bucket device to the casing. CONSTITUTION:A kelley-bar 9 is expandably and contractably attached to the inner side of a gripper device 6 through a hydraulic jack 8 and a Kelley-bar guide 9a in a manner to transmit a rotation force to a bucket device 10. By means of a signal from a control device 5, a gripper device 6 is fixed on the inside of a casing 1 by a gripper 6a. By feeding pressure oil to a hydraulic cylinder 8 through an accumulator 7, the bucket device 10 is pressed down based on the casing 1 by the Kelley-bar 9 and a rotation force is transmitted in a state that a relative position between the casing 1 and the bucket device 10 is changed. This constitution performs independent propulsion of the casing and the bucket from each other and employs a plurality of excavation method, such as casing precedence and bucket precedence.