Title:
SURVEY SYSTEM OF TUNNEL GROUND
Document Type and Number:
Japanese Patent JP3238840
Kind Code:
B2
Abstract:
PURPOSE: To increase the survey accuracy, by finding the average drilling speed and rotary pressure from the measured data by a hydraulically driven drill bit and obtaining a converted elastic wave speed from the correlation thereof with the elastic wave speed of the ground.
CONSTITUTION: Drilling speed, rotary pressure, feed pressure, striking pressure, bit abrasiveness, and size of drilled chips in different kinds of rock of standard rock samples, are measured by a jumbo 1. Then the size of drilled chips of which measured figure is cancelled, is decided and a corrective coefficient corresponding to the feed pressure, striking pressure, and bit abrasiveness against the drilling speed and the rotary pressure, is decided at every kind of sample rocks. After the same factor has been measured by the jumbo 1 in the initial excavation stage, the drilling speed and the rotary pressure are corrected by the corrective coefficient of the same kind of rock to get the standard drilling speed and rotary pressure. Further, a correlation formula between the figure and the elastic wave speed measured by a hammer switch 11 is found. At the final excavation, the correlation formula is applied to the standard drilling speed and rotary pressure obtained likewise to find a converted elastic wave speed and evaluate the ground. In this way, the evaluation accuracy can be remarkably increased and the operability and the safety can be improved.
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Inventors:
Takashi Yamanoi
Masatoshi Mutoh
Takuji Endo
Kenichi Nagamoto
Masatoshi Mutoh
Takuji Endo
Kenichi Nagamoto
Application Number:
JP30838394A
Publication Date:
December 17, 2001
Filing Date:
November 18, 1994
Export Citation:
Assignee:
Fudo Construction Co., Ltd.
International Classes:
E21B47/007; (IPC1-7): E21B47/00; E21B47/01
Domestic Patent References:
| JP4161588A | ||||
| JP4353191A | ||||
| JP4120395A | ||||
| JP7259469A |
Attorney, Agent or Firm:
Koichi Nagata
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