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Vibrating Wire Perimetric Jointmeter

The Vibrating Wire Perimetric Jointmeter is designed to monitor three-way displacement at joints and cracks. The reference anvil design allows the Vibrating Wire transducers to show independent movement in all directions, irrespective of each other.

The Jointmeter comprises a 3D mounting system which consists of Stainless Steel arms with fixing anchors. Three Vibrating Wire displacement transducers, which also monitor temperature, are installed within the mounting system and positioned for monitoring.

Data is retrieved either remotely or manually; a data logger is used for remote monitoring and a readout unit for manual reading.

The Vibrating Wire Perimetric Jointmeter is easy to install, requiring minor drilling into the concrete slab, and is particularly suited for use on concrete-faced dams.

Product Features 

  • Reads in X, Y and Z axes
  • Uses proven Vibrating Wire technology
  • Proven in long term monitoring
  • Suitable for manual or remote monitoring
  • Fully waterproof
  • Fitted with thermistor for temperature monitoring
  • Accurate and robust

Product Benefits

  • Three way independent movement monitoring in one easy installation
  • Accurate, repeatable readings over long cable lengths
  • Long working life, long term stability and reliability
  • Over-voltage surge arrestor fitted to protect against electrical damage
  • Connecting cable is strong, screened and flexible
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Operation

The Stainless Steel arms of the jointmeter are installed either side of a joint or crack.

Once the arms are securely fixed in position, the VW transducers are positioned against the reference anvil faces, most commonly set to their mid-point. The transducer cables are then either wired into a datalogger for remote monitoring, or wired into a terminal or junction box to manually record the readings with a readout unit.

Movement in the monitored position will result in relative change between the arms; this in turn will cause one or more of the VW transducer rods to move independently, changing the frequency of the wire. This change in frequency is recorded and can be converted to show the movement in millimeters.

When the installation is complete an initial (datum) reading is taken and this can then be compared to all subsequent readings to give the change and magnitude of displacement

Applications

Vibrating Wire Triaxial Jointmeters are used for monitoring of movements at construction joints.

Typical examples include:
  • Concrete dams
  • Tunnels
  • Tanks
  • Masonry structures

For more information or to speak with one of our product experts, please contact us directly.