Jointmeters are used to monitor movement at joints and cracks. Submersible sensors for 3D jointmeters are designed to withstand extended underwater operation. Typical applications include:
A 3D jointmeter consists of three submersible displacement sensors and a mounting system. The exact design of the mounting system, which consists of a reference bracket and and three end brackets, depends on site specific details, such as the height of the joint covers and the degree of protection required. The drawing above illustrates the concept. In practice, the brackets are often designed by engineers at the site.
Two types of sensors are available: VW sensors, which are suitable for pressures up to 17 bar and and potentiometers, which are suitable for pressures up to 24 bar. The sensors are mounted parallel to the axis of expected movement. A change in the distance across the joint causes a change in the signal output by the sensor.
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.
Submersible: Two types of sensors are available.
Easy Installation: Installation requires only small diameter, shallow drill holes in the concrete slab.
Manual or Automatic Readings: The jointmeter is easily connected to a data logger for unattended monitoring.
For more information