Measuring and testing – Specimen stress or strain – or testing by stress or strain... – Earth stresses
Patent
1997-11-26
1999-07-27
Noori, Max H.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
Earth stresses
7315259, G01N 300
Patent
active
059293411
ABSTRACT:
A stress measuring rock support device is provided, such as a cable bolt or friction stabilizer, which has an internal longitudinal cavity, such as a groove or a flat section on the kingwire or a hollow core in the kingwire or the like. One or more rigid wires or filaments extend in such cavity and their ends are anchored at predetermined anchor points within the cavity. The other ends of the rigid wires or filaments are spring-loaded and are provided with movable actuators having electrical contacts which are in contact with a linear potentiometer and measure the displacement of the actuators resulting from the stretch of the cable. This is then correlated to measure the cable load or strain resulting from the stress applied to the rock support device. The spring-loaded arrangement as well as the linear potentiometer and the actuators with electrical contacts are enclosed within a suitable cover to form an instrumentation head assembly for the rock support device.
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E. Hoek, P.K. Kaiser and W.F. Bawden "Support of Underground Excavations in Hard Rock", 1995, pp. 152-164.
Patent Abstracts of Japan, vol. 095, No. 009, Oct. 31, 1995 & JP 07 150561 A (Moriya Koki KK), Jun. 13, 1995.
Bawden William F.
Hyett Andrew J.
Canadian Mining Industry Research Organization
Noori Max H.
Primak George J.
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