Strain monitoring system

Details Strain monitoring system Strain monitoring system

1988-08-25

1989-08-22

Myracle, Jerry W.

Measuring and testing

Specimen stress or strain, or testing by stress or strain...

Earth stresses

73DIG1, G01B 716

Patent

active

048584720

ABSTRACT:
A vibrating wire strain meter has a steel proving ring across the bore of which extends a taut wire. The outer surface of the proving ring has sloping or tapered grooves extending axially along the entire length of the ring. A pair of diametrically opposed wedges sloping at the same angle as the grooves are used to wedge the proving ring in a borehole. The tapered grooves provide positive guiding of the wedges such that the device can be positioned accurately and repeatably in relation to the borehole wall. Preferably, the wire extends across a diameter which is perpendicular to the diameter on which the grooves and wedges are located. A novel tool for inserting and withdrawing the strain meter is also described.

REFERENCES:
patent: 3029874 (1962-04-01), Turman
patent: 4141246 (1979-02-01), Randolph
patent: 4159641 (1979-07-01), Hawkes
patent: 4594899 (1986-06-01), Henke et al.
Geotechnical Instrumentation, Geokon, Inc. (1986), pp. 1-5.
Issues in Rock Mechanics, Proceedings Twenty-Third Symposium on Rock Mechanics, the University of California, Berkeley, CA, Aug. 25-27, 1982; pp. 836-845.
Class 42k, 45oz. No. 142462: Dynamometer.
L. G. Etkin (679890/25 dated 21.9.60).

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