Title:
DIAMETRAL EXPANSILE DRILLING METHOD AND DEVICE THEREOF
Document Type and Number:
Japanese Patent JP2674734
Kind Code:
B2
Abstract:
PURPOSE: To aim at the promotion of unmanned, highly efficient mechanization.
CONSTITUTION: A casing (10) is rotated and thrust in, drilling a glory hole (A), and it is pulled out, then a drilling blade (20) is locked to the casing (10) by a locking device (30). In this constitution, the casing (10) is rotated and thrust in, whereby the glory hole (A) is expanded into a large diametral hole (B) with the drilling blade (20), and then digged earth and sand taken into the glory hole (A) are discharged out of an earth and sand intake (13) with a hammer grab bucket.
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Inventors:
Shimai Moriyuki
Kawatoshi Masatoshi
Kawatoshi Masatoshi
Application Number:
JP12499794A
Publication Date:
November 12, 1997
Filing Date:
June 07, 1994
Export Citation:
Assignee:
Kashima Construction Co., Ltd.
International Classes:
E21B7/28; E21B7/30; E21B10/26; E21D1/06; (IPC1-7): E21D1/06; E21B7/28; E21B7/30; E21B10/26
Domestic Patent References:
| JP5222892A | ||||
| JP5287978A | ||||
| JP6146762A | ||||
| JP6146764A | ||||
| JP57788U |
Attorney, Agent or Firm:
Toshitada Takahashi (1 outside)
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