Title:
CUT-OFF METHOD FOR EXCAVATED HOLE MOUTH AND DEVICE THEREFOR
Document Type and Number:
Japanese Patent JP3446987
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To improve the effect of cut-off and work efficiency.
SOLUTION: An intervening member 3 having a projection 3a mounting to a specific position of an excavated hole member formed by connecting a plurality of unit excavated hole members is connected in a detachable manner, and a hole is excavated with a boring machine by means of the excavated hole member. A mouth cut-off device 10 is pushed in by thrust of the excavated hole member through the projection 3a, and after the completion of pushing in, the intervening member 3 is replaced with the normal unit excavated hole members in a state to substantially close the mouth cut-off device 10 with the excavated hole member, and the hole is again excavated up to required depth.
Inventors:
Tadashi Kuroishi
Takashi Sakai
Kazuyuki Niwata
Takashi Sakai
Kazuyuki Niwata
Application Number:
JP6759497A
Publication Date:
September 16, 2003
Filing Date:
March 21, 1997
Export Citation:
Assignee:
Right Industry Co., Ltd.
International Classes:
E21B33/06; E02D5/80; E21B3/00; (IPC1-7): E21B33/06; E02D5/80
Domestic Patent References:
| JP885942A |
Attorney, Agent or Firm:
Yoshihisa Nagai
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