Title:
DRILLING METHOD
Document Type and Number:
Japanese Patent JP2003314180
Kind Code:
A
Abstract:
To provide a drilling method surely preventing diversion from an originally estimated drilling direction in various piling works.
A casing 8 with a built-in screw rod 6 is guided and the lower end of the lower bracing 7 extended to reach ground is forced to touch the ground. The ground is drilled by the casing with the built-in screw rod.
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Inventors:
FUJITA TAKATOYO
Application Number:
JP2002115887A
Publication Date:
November 06, 2003
Filing Date:
April 18, 2002
Export Citation:
Assignee:
R S JAPAN READER KK
International Classes:
E21B7/00; E02D5/18; (IPC1-7): E21B7/00; E02D5/18
Attorney, Agent or Firm:
Shoji Yamamoto