Title:
拡底掘削装置
Document Type and Number:
Japanese Patent JP7116951
Kind Code:
B2
Abstract:
To provide a bottom expansion drilling machine that can withdraw a drilling arm part without changing the drilling arm part structurally.SOLUTION: A bottom expansion drilling machine comprises a gripper part 30 having a cylinder 31 for gripper that presses the inner peripheral surface of a casing buried in the ground, and a drilling arm part 40 having a cylinder 41 for drilling that extends in the radial direction to excavate the peripheral wall of a vertical hole by rotation of the casing. A hydraulic circuit 50 in the bottom expansion drilling machine is provided with a hydraulic circuit 54 for bypass for making oil flow into a hydraulic passage 52b for contraction in a hydraulic passage 52 for drilling that contracts the cylinder 41 for drilling, from both a hydraulic passage 51a for extension and a hydraulic passage 51b for contraction in a hydraulic passage 51 for grip that extends and contracts the cylinder 31 for gripper. Because of the hydraulic circuit 54 for bypass, the drilling arm part 40 can be contracted and withdrawn, and the bottom expansion drilling machine can be hoisted up by a crane truck.SELECTED DRAWING: Figure 5
Inventors:
Yosuke Saida
Ichiro Sakurai
Shinji Nishitani
Ichiro Sakurai
Shinji Nishitani
Application Number:
JP2018075449A
Publication Date:
August 12, 2022
Filing Date:
April 10, 2018
Export Citation:
Assignee:
Kotobuki Sangyo Co., Ltd.
Chikuho Manufacturing Co., Ltd.
Sanwa Equipment Co., Ltd.
Chikuho Manufacturing Co., Ltd.
Sanwa Equipment Co., Ltd.
International Classes:
E21B11/00
Domestic Patent References:
| JP2008008077A | ||||
| JP2009275357A | ||||
| JP54054901A | ||||
| JP55097204U | ||||
| JP11062458A |
Attorney, Agent or Firm:
Hisashi Kato
Keita Tohsaka
Toru Nanse
Keita Tohsaka
Toru Nanse