Title:
DRILLING METHOD FOR BLASTING HOLE AND DRILLING MACHINE THEREFOR
Document Type and Number:
Japanese Patent JP3040220
Kind Code:
B2
Abstract:
PURPOSE: To set a guide shell speedily and correctly in drilling.
CONSTITUTION: A hydraulic jumbo 10 is equipped with a boom 12 which is shiftable in the vertical and lateral directions on a carriage 11, and a guide shell 13 is installed integrally with a drifter 14 through a guide shell receiving part 13a on a boom 12. The guide shell 13 is installed so as to be rotatable around the standard axis A4 of the guide shell receiving part 13a. Further a link mechanism is installed on the receiving part 13a, and the parallel relation between the standard shaft A4 of the receiving part L3a and the standard shaft A3 of the carriage 11 is maintained when the boom 12 or the guide shell 13 shifts. An angle meter for measuring the angle θ' formed by the horizontal plane and the plane including the standard shaft A4 and the guide shell 13 at the same time is provided, and when the boom 12 is shifted from the drilling starting point to the next drilling starting point after the drilling of a blasting hole, the angle θ' is made equal to the angle θ formed by the horizontal plane, setting the tunnel shaft A1 which is previously set at each drilling starting point, as center.
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Inventors:
Takashi Okada
Kazunori Kawahara
Shigeo Kitahara
Kazunori Kawahara
Shigeo Kitahara
Application Number:
JP26520791A
Publication Date:
May 15, 2000
Filing Date:
September 17, 1991
Export Citation:
Assignee:
Kumagai Gumi Co., Ltd.
International Classes:
E21B7/02; E21B15/00; E21B19/08; E21D9/00; (IPC1-7): E21D9/00; E21B7/02
Domestic Patent References:
| JP6323390U |
Attorney, Agent or Firm:
Masahisa Ishida