Title:
BORING BIT AND BORING CORE SAMPLING METHOD
Document Type and Number:
Japanese Patent JP2018197446
Kind Code:
A
Abstract:
To provide a boring bit and a boring core sampling method capable of reducing chipping of a peripheral corner portion of a boring core to be sampled or reducing a degree of chipping.SOLUTION: A boring bit 1 which captures a boring core 6 drilled with a bit 3 into a core tube 2 in which the bit 3 for drilling is provided at a tip of the core tube 2 has a structure in which a gel sheet 4 having shrinkability on an inner wall of the core tube 2 is dispersedly arranged on the inner wall surface of the core tube 2 and adhered and a friction reducing sheet 5 is adhered to an inside of the gel sheet 4.SELECTED DRAWING: Figure 1
Inventors:
TAKAMOTO NAOHIKO
SAITO RYO
SAITO RYO
Application Number:
JP2017102368A
Publication Date:
December 13, 2018
Filing Date:
May 24, 2017
Export Citation:
Assignee:
SHIMIZU CONSTRUCTION CO LTD
International Classes:
E21B25/08; G01N1/08
Domestic Patent References:
| JPH0618501A | 1994-01-25 | |||
| JP2016186450A | 2016-10-27 | |||
| JP2000161428A | 2000-06-16 | |||
| JPS61172990A | 1986-08-04 | |||
| JP2001090468A | 2001-04-03 | |||
| JP2002228558A | 2002-08-14 | |||
| JP2001098539A | 2001-04-10 | |||
| JPH07208059A | 1995-08-08 | |||
| JP2016069814A | 2016-05-09 |
Foreign References:
| US4716974A | 1988-01-05 | |||
| US4312414A | 1982-01-26 | |||
| US20160194928A1 | 2016-07-07 |
Attorney, Agent or Firm:
Sakai International Patent Office