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VW Strain Gaged Rockbolt


The Model 4910 Instrumented Rockbolt comprises a vibrating wire strain gage located inside a short length of standard threaded rockbolt or rebar. This short length is then connected via a coupling to a longer length of the same bolt material. The instrumented rockbolt is installed in the same manner as conventional rockbolts, making sure that the strain gage remains located within the loaded part of the rockbolt.


Standard Range 2500 µε, equivalent to around 27,215 kg in a 25 mm Ø bolt
Resolution 0.5 µε, equivalent to around 5 kg in a 25 mm Ø bolt
Accuracy ±0.25% F.S.
Linearity ±0.5% F.S.
Output 1400-3000 Hz
Temperature Range −20°C to +80°C
Bolt Sizes 25 mm, #8 rebar, and larger
Length 300 mm (standard)