DRILLING BIT FOR STEEL PIPE AND CONCRETE WELL CONSTRUCTION METHOD

Title:

DRILLING BIT FOR STEEL PIPE AND CONCRETE WELL CONSTRUCTION METHOD

Document Type and Number:

Japanese Patent JP3190287

Kind Code:

B2

Abstract:

PROBLEM TO BE SOLVED: To provide a drilling bit suitable for drilling a communication hole between joint steel pipes of steel pipes having joints built in an adjacent drilling hole in a steel pipe and concrete well construction method.
SOLUTION: A pilot bit 15 is provided on a tip part 12 of a bit body 11 under the rotational driving force, and a guide pit 16 provided with a blade part 28 insertable in a slit formed in a joint steel pipe of a steel pipe having joints is provided on an outer circumferential part of the bit body 11. A guide bit body 27 is a cylindrical body to be freely fit to the outer circumferential part of the bit body 11 so as to be relatively turnable to the bit body 27, and a rear end part of the guide bit body 27 can be driven by a flange part 29 provided on the outer circumferential part of the bit body 11.

Inventors:

Takeshi Hayashi
Kazuo Fujifun
Kazuyoshi Yoshida
Hisashi Hasegawa
Takuya Saitoh
Sei Gunji
Takayoshi Fukumura
San Yoshihiro

Application Number:

JP21360497A

Publication Date:

July 23, 2001

Filing Date:

August 07, 1997

Export Citation:

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Assignee:

Mitsubishi Materials Corporation
Nippon Steel Corporation
Teishi Ishii Industry Co., Ltd.

International Classes:

E21B10/00; E21B10/26; E21B10/36; (IPC1-7): E21B10/00; E21B10/26; E21B10/36

Domestic Patent References:

JP2200917A
JP5156625A
JP626291A
JP57146888A
JP1072994A
JP5311654A

Attorney, Agent or Firm:

Masatake Shiga (12 outside)

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