Title:
DRILLING DEVICE AND GROUND INVESTIGATION METHOD
Document Type and Number:
Japanese Patent JP2023173154
Kind Code:
A
Abstract:
To eliminate the need to repeatedly recover and install a rod attached with a cone probe or a rod attached with a drilling bit even if the rod hits hard ground.SOLUTION: A drilling device 60 comprises: a main body 61 that is attached to a tip of a drilling rod 55 and has a tubular shape through which a CPT rod 50 having a cone probe 51 attached to the tip can be inserted; an annular crown bit 68 that is supported by the main body 61 and faces in an excavation direction; and a core bit 63 that is movable between a stored position in which the core bit is supported by the main body 61 within an opening 6B of the crown bit 68 and the cone probe 51 and CPT rod 50 are stored along an inner surface of the main body 61 so that they can be inserted through the opening 6B, and a digging position that occupies a substantial range within the opening 6B and faces in the digging direction.SELECTED DRAWING: Figure 3
More Like This:
| WO/2018/045187 | CORE CATCHER |
| WO/2013/013023 | ABRASIVE CORING BIT |
| WO/2013/028256 | IMPREGNATED DRILLING TOOLS INCLUDING ELONGATED STRUCTURES |
Inventors:
EBIUMI ITSURO
OKAMURA AKIRA
TORII MASASHI
OKAMURA AKIRA
TORII MASASHI
Application Number:
JP2022085202A
Publication Date:
December 07, 2023
Filing Date:
May 25, 2022
Export Citation:
Assignee:
ASIA KAIYO KK
International Classes:
E21B10/02
Attorney, Agent or Firm:
Hidekazu Miyoshi
Shunichi Takahashi
Masakazu Ito
Toshio Takamatsu
Shunichi Takahashi
Masakazu Ito
Toshio Takamatsu