Title:
EXCAVATION TOOL AND EXCAVATION METHOD
Document Type and Number:
WIPO Patent Application WO/2017/126247
Kind Code:
A1
Abstract:
This excavation tool is configured in such a manner that: an air delivery pipe is inserted along the inner periphery of an excavation pipe having a front end at which a tool body is disposed; a water supply passage is provided along the outer periphery of the excavation pipe; a discharge passage for discharging cuttings together with excavation water into the space between the excavation pipe and the air delivery pipe is formed in the front end of the tool body; and an air discharge hole open to the space is formed in the front end of the air delivery pipe.
Inventors:
TANAKA KUNIHIKO (JP)
NAKAMURA KAZUYOSHI (JP)
TOMITA YASUTAKA (JP)
NAKAMURA KAZUYOSHI (JP)
TOMITA YASUTAKA (JP)
Application Number:
PCT/JP2016/086558
Publication Date:
July 27, 2017
Filing Date:
December 08, 2016
Export Citation:
Assignee:
MITSUBISHI MATERIALS CORP (JP)
International Classes:
E21B10/60
Domestic Patent References:
| WO2015151737A1 | 2015-10-08 | |||
| WO2010071563A1 | 2010-06-24 |
Foreign References:
| JP2013028936A | 2013-02-07 | |||
| JP2010077699A | 2010-04-08 | |||
| JP2003161092A | 2003-06-06 | |||
| JPH07217381A | 1995-08-15 | |||
| JP2006336266A | 2006-12-14 | |||
| JP2007170087A | 2007-07-05 |
Other References:
See also references of EP 3406841A4
Attorney, Agent or Firm:
SHIGA Masatake et al. (JP)
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