CGEO-EJ Vibrating Wire Embedment Jointmeter

Description

CGEO-EJ Vibrating Wire Embedment Jointmeter is used to monitor internal cracks in large volumes of concrete or boundary joints of structures such as rocks. The sensor can be embedded within large volumes of concrete to monitor crack changes over long periods. The instrument includes a temperature measurement function and an integrated universal joint that allows the sensor to withstand a certain degree of shear deformation.

Applications

Abutments, slabs, foundations and retaining walls

Tunnels or shaft linings; arch, gravity and buttress dams

Monitoring construction joints

Operation

The socket is installed in the first lift of concrete, using an installation plug to prevent concrete entering the socket.

Before the second lift of concrete is cast, the main body is screwed into the installed socket, extended sufficiently (most commonly to its mid-point) to allow for expected joint 

movement, welded or tied to the rebar and then the second lift of concrete is cast.

When both lifts of concrete are complete, the jointmeter is now firmly anchored into each concrete lift and will measure opening or closing of the joint.

The sensing transducer is smaller than the protective body of the jointmeter, therefore a degree of shearing motion is accommodated by universal joint connections within the unit.

Features

Accurate, long-term stability

Long working life, long-term stability and reliability 

Suitable for manual or remote monitoring 

Waterproof

Integral thermistor

Specifications