Patent JPS577553A successfully refreshed from Google Patents.
JPS577553A
Expired / Lapsed
JP
⏱️ 0.0 years remaining
Measuring method for excessive stress generated in rock bed
Assignee: Toda Corp
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Filing: 1980-06-17
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Granted: —
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Expires: 2000-06-17
Abstract
Abstract PURPOSE:To prevent the collapse of a rock bed in an excavating operation, by analyzing the ultrasonic vibration resulting from the stress generated inside the rock bed. CONSTITUTION:A hole 3 is drilled at a necessary portion of a rock bed 2 around an underground structure 1. In the hole 3, a vibration receiving device 4 such as a microphone is inserted, and the output thereof is supplied to an amplifier 7, to which headphone 8 and a recorder 9 are connected. Thereby, the recorded data are analyzed to detect the excessive stress being generated in the rock bed and to take a countermeasure for said portion.
Inventors
- 👤 Hideji Hikage
- 👤 Katsuhiko Kumagai
Bibliographic Details
Application Number
—
Jurisdiction
JP
Data Source
google_patents
Last Synchronized
2026-11-06 06:23
CPC Classifications
G; G01; G01N; G01N29/00; G01N29/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
JPS5660330A
Cited
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