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Colebrand Lock up devices | Corrosion Dignosis and Monitoring | Movement Monitoring |
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email: adeng@colebrand.com

Buildings, bridges, tunnels and other structures are all subject to movement. This is caused by settlement, temperature changes and subsidence, landslides, seismic activity, explosions and even excessive vibration from passing traffic or nearby machinery.
The CI Movement Monitoring System measures displacement, vibration and tilt continuously and automatically. Each system is purpose designed for the individual application. It is available under the CI Monitoring of Structures scheme which includes regular reports with fully detailed analysis of the data collected.

If the structure is in an area that is prone to earthquakes, the monitoring system can be connected to an alarm, triggering it when movements exceed a preset threshold.

Types of sensors used for movement monitoring include the following:

Tilt sensors

These measure tilt (expressed in degrees) and show how the building is deflecting as a whole structure. Because they are completely sealed they are unaffected by other factors such as humidity or temperature. Their sensitivity can be adjusted to suit the particular application.
 
Displacement sensors

When a crack has appeared in a structure, displacement sensors measure the movement of the component on one side relative to that on the other. Like tilt sensors they are completely sealed; moreover, they automatically compensate for changes in humidity or temperature which would otherwise affect their accurate operation; they can also record temperature.

 
Accelerometers
 

These are highly accurate recorders of vibrational activity. They are usually used in groups set at angles so that the direction and origin of the vibration can be established.

The data loggers in the Movement Monitoring System record all data acquired by movement and temperature sensors. The collected data is usually downloaded to a PC, either on-site or remotely via a modem and telephone connection to a PC that may be anywhere in the world. The report produced is clear and concise, using graphical displays where appropriate. Statistical techniques such as regression analysis ensure that the report is accurate