Measuring and testing – Specimen stress or strain – or testing by stress or strain... – Earth stresses
Patent
1989-05-03
1990-10-16
Myracle, Jerry W.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
Earth stresses
73587, G01B 716
Patent
active
049626680
ABSTRACT:
A sensor unit is disclosed for use in monitoring in situ changes in dynamic and static stress properties of any material to be monitored, such as monolithic concrete or underground rock structures. The sensor unit includes a hollow, waterproof tubular body to be inserted into a cylindrical borehole in the material to be monitored. A transducer is mounted within the body, which by means of strain gauges, provides an output signal responsive to deflection of the sidewall of the borehole. The transducer is coupled to the sidewall by means of pressure buttons. A monitor is also disclosed, which comprises the sensor unit, a data collection unit and a data analyzing unit. A method for sensing dynamic and static changes in material stresses is also disclosed.
REFERENCES:
patent: 4461177 (1984-07-01), Feng
patent: 4491022 (1985-01-01), de la Cruz
patent: 4510812 (1985-04-01), Feng
patent: 4517842 (1985-05-01), Twomey et al.
patent: 4760741 (1988-08-01), Koopmans et al.
IEEE Transactions on Nuclear Science, vol. NS-27, No. 4, Aug. 1980, pp. 1291-1298, New York, U.S.; E. P. Binnall: "Instrumentation and Computer Based Data Acquisition for In-Situ Rock Property Measurements", *p. 1296, paragraph 3-p. 1297, paragraph 3; figures*.
Paper entitled Three Component Borehole Deformation Gage Roctest Ltee Ltd.
Four page document relating to USBM Gage from Improvements in The Three Component Borehole Deformation Gage and Overcoring Techniques USBM RI7894.
Codrington John
Cotter John J.
Frantzos Dimitri
Hamel Pierre
Preston Christoper J.
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