Title:
掘削ロッド
Document Type and Number:
Japanese Patent JP7237664
Kind Code:
B2
Abstract:
To provide a drilling rod applicable in a case of drilling the ground in a tip strike method and allowing an application as an electric cable.SOLUTION: A drilling rod provided with a drilling bit and a vibration generating mechanism generating strike force to the drilling bit is provided with: a drilling rod body 5a with a metal hollow cylindrical body; a conductive bar 7a received in a hollow part of the drilling rod body 5a; a spacer 9 arranged between the conductive bar 7a and the drilling rod body 5a, wherein a working fluid passage in communication with a working fluid supply port of the vibration generating mechanism is formed in a gap between the drilling rod body 5a and the conductive bar 7a as well as a communication part is arranged in the spacer 9, where working fluid flowing down the working fluid passage runs through.SELECTED DRAWING: Figure 3
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Inventors:
Tohru Kuwahara
Nobuto Yamada
Toshiba Takashi
Shuichi Shinmachi
Nobuto Yamada
Toshiba Takashi
Shuichi Shinmachi
Application Number:
JP2019042520A
Publication Date:
March 13, 2023
Filing Date:
March 08, 2019
Export Citation:
Assignee:
Obayashi Corporation
Japan Underground Exploration Co., Ltd.
Japan Basic Technology Co., Ltd.
Japan Underground Exploration Co., Ltd.
Japan Basic Technology Co., Ltd.
International Classes:
E21D9/00; E21B6/04
Domestic Patent References:
| JP2003269068A | ||||
| JP2017066646A | ||||
| JP2005226388A | ||||
| JP2000011286A | ||||
| JP2017128881A | ||||
| JP2003184065A | ||||
| JP11107668A | ||||
| JP2001280054A | ||||
| JP2003066155A | ||||
| JP2015081471A |
Foreign References:
| CN106703682A |
Attorney, Agent or Firm:
Patent Attorney Corporation Isshiki International Patent Office