The instrument consists of two parts, a socket and the main body with a waterproof vibrating wire sensing gauge. During construction of the structure, the socket is secured to the form and embedded into a lift of the block to be constructed. After removal of the form, and prior to concreting of adjacent block, the gauge is screwed into the socket, set at the desired range and then embedded into concrete.
Opening and closing of joint is then measured by the gauge, which is firmly anchored in both blocks. The instrument body includes universal joints, on which sensing element is mounted, accommodating a small degree of shear movement that might occur.
The RST vibrating wire jointmeter is a very robust and accurate instrument with excellent long term stability. It can be measured by RST vibrating wire portable readout units or a data logger if remote continuous monitoring of the joints is required. All measurements are compared to an initial datum reading, providing a history of magnitude and rate of movement at the joint.
- Long term stability in difficult environments.
- Suitable for datalogging and remote monitoring.
- Integral lightning protection.
- High accuracy and resolution.
- Accommodates shear movement.
- Not affected by cable length.
- Monitor settlement or heave associated with construction, mining, and tunneling.
- When used around inclinometer casing, deformation in the third axis can be monitored.
- Subsidence monitoring.
- Displacement of retaining walls, piers, and abutments.
- Bottom heave of excavations.
- Relaxations of rock around tunnel openings.
- Foundation settlement monitoring.
- Embankments and fills.
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