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Fissurometers and crack monitors - important instruments for safety assessment

The monitoring of cracks and crevices is an essential factor in assessing the safety of buildings, structures and natural hazards such as rockfall and landslides. Not only the observation of stomata but also the parallel and orthogonal displacement of components or boulders plays an important role in this respect. For this purpose, we offer 3D-fissurometers that can detect movements in all 3 spatial directions.

Since it is often necessary to recognize potential dangers immediately, our joint gap measuring devices can be equipped with electrical displacement sensors and automatic data acquisition in connection with corresponding alarm functions. 

Principle of operation

On both sides of the gap to be monitored, a rod end is screwed to a threaded bolt anchored in a hole. The measuring rod that is guided in a tube is anchored on the other side, while the measuring head, which serves to set up a dial gauge or an electrical displacement sensor, is located on the other. The guide tube is telescopic, with the longer part sliding over the shorter one. This design and the use of rod ends guarantee an error-free measurement, since any torsional forces and buckling stresses that may occur do not result in a falsification of the measured value. Two different types are available: Parallel fissurometers measure the gap width between two parallel surfaces, normal fissurometers measure the gap between two perpendicular surfaces.

For buildings, compact instruments with mounting plates made of stainless material with angles are available. They are arranged so that the measurement can take place in all three spatial directions. A measuring range of +/- 15 mm is achieved in each case. This type can also be carried out manually with a dial gauge or electrically with displacement sensors.

In addition, special shapes can also be supplied for special areas of application.

Our service

In addition to supplying the instruments manufactured in-house, we can also assemble and commission them in difficult terrain. Moreover, we supply data acquisition and possible alarm functions according to the wishes of our customers and the local conditions (for example with solar power supply in nature).

Highlights

  • Variable distances between anchor points
  • Good adaption to the spatial conditions due to design variants
  • Compact and stable construction and easy assembly
  • Automatic data acquisition possible
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