1D & 3D Submersible Jointmeters
Applications
The submersible jointmeter is used to monitor movement at joints and cracks and is designed to withstand extended submersion. Typical applications include:
- Monitoring movement at submerged construction joints in concrete dams.
- Monitoring joints or cracks in tunnels and tanks.
Operation
The submersible jointmeter is available in 1-D and 3-D versions. Components include anchors, target/transducer mounts, and VW displacement transducers. The installation procedure is similar for both jointmeters.
First, anchors are installed on opposite sides of the joint. A template simplifies placement of the drill holes and maintains proper alignment of the anchors as the epoxy grout cures. The target and transducer mounts are then secured to the anchors, and the VW displacement transducer is positioned in the transducer mount. Finally, signal cable is routed to a readout station.
A change in the distance across the joint causes a change in the frequency signal produced by the VW displacement transducer when excited by a readout or data logger. The readout processes the signal, applies calibration factors, and displays a reading in millimeters or inches.
The initial reading is used as a datum. Subsequent readings are compared to the datum to calculate the magnitude, rate, and acceleration of movement at the joint.
Advantages
High Resolution: The VW jointmeter provides a resolution of 0.0125 mm over a range of 60 mm.
Easy Installation: A template and anchor kit make installation simple.
Multi-Axis Monitoring: The 3-D version of the jointmeter can monitor displacement in three orthogonal axes.
Temperature Measurement: The VW displacement transducer is equipped with a temperature sensor.
Manual or Automatic Readings: The jointmeter is easily connected to a data logger for unattended monitoring.
For more information
For further information, please refer to the related document (pdf). These documents can be viewed and printed with Adobe Acrobat Reader.