Title:
DRILLING DEVICE AND METHOD
Document Type and Number:
Japanese Patent JP3388723
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a drilling device and method for easily installing an outer casing and eliminating the need for the removal of the outer casing.
SOLUTION: An excavation device 1 is provided with an outer casing 20, inner rods 10... that are accommodated in the outer casing 20, and an excavation part 30 that is connected to the tip part of the inner rods 10... and excavates natural ground by the outer casing 20 made of a resin.
Inventors:
Koji Ishiyama
Ryoichi Hikima
Junichi Tsukada
Ryoichi Hikima
Junichi Tsukada
Application Number:
JP2000065245A
Publication Date:
March 24, 2003
Filing Date:
March 09, 2000
Export Citation:
Assignee:
Nishimatsu Construction Co., Ltd.
International Classes:
E21B7/04; (IPC1-7): E21B7/04
Domestic Patent References:
| JP49106104A | ||||
| JP4221195A | ||||
| JP11148291A | ||||
| JP51128803A |
Attorney, Agent or Firm:
Hiroshi Arafune (1 person outside)