Hydraulic force transducer for the use in geotechnology


Anchoring Force

In geotechnics – especially in rock operations and foundation works – permanent and reliable monitoring of anchor force matters a lot. Anchors are employed as constructional elements to stabilise the subsoil by taking up longitudinal and transverse forces. The metrological inspection and monitoring of the pretensioning force of anchors as load-bearing elements of a building structure therefore deserves particular importance in geotechnics applications – especially in the case of permanent anchors.

Measuring anchor force:

Ensuring pretensioning force in geotechnics use is also made of lightweight ground and rock anchors. In this case, the pretensioning force is usually ensured in the course of installation by a torque wrench set to a reference torque. With this procedure for measuring the anchor force, take note that:   The torque of the wrench must be checked by installing force gauges on individual anchors.

Geotechnics Monitor anchor force with gauges

For lightweight ground and rock anchors with a large free play length and heavy constructions, the applicable rule is:

The anchor force (pretensioning force here) should always be monitored by gauges. By doing this, the evolution of the pretensioning force can be observed at the same time.

This may be relevant in geotechnics applications, and with other methods such as the lifting test it is possible only with difficulty. Permanent monitoring – including anchor force – counts in geotechnics Permanently installed gauges for monitoring the anchor force allow the pretensioning force to be observed continually.

Furthermore, in geotechnics they also offer the advantage of being able to record the measured values via remote transmission.

Automatic interrogation by a measured-value acquisition system according to a predefined measuring rhythm is also possible.

Example applications in geotechnics:

  • Checking and long-term observation of the anchor force acting on the anchor head
  • Monitoring of anchor- and support loads in shoring sub-surface hollows, in tunnelling and tunnel-driving, in slope construction, in open building pits, on retaining walls, in building pit lining and in above- and below-ground works of other applications of geotechnics
  • Checking of pile loading and pile tests Among the forms of construction used in anchor-force transducers in geotechnics, the following two are the most important:
  •  hydraulic anchor force gauges in which the pretensioning force is measured via a pressure-transmitting fluid
  • hydraulic/electrical or electrical anchor force gauges in which measurement is again made either via a fluid or via compression of the body.

Geotechnics without such designs are no longer conceivable today.

Gauges for measuring anchor force in geotechnics.

For the measurement of anchor force in geotechnics, tecsis has developed hydraulic force gauges that display the measured values in either analogue or digital form. This occurs in conjunction with measuring-display devices. The gauges prepared for measuring anchor force are highly accurate.

The tension forces that arise in geotechnics are able to be measured at the anchor head in a simple, economical manner and directly brought to display. The anchor force gauges permit continuous monitoring of the forces applied by anchors and other re-anchoring rods and -cables.

Where in geotechnics is the measurement of anchor force used?

  • Uplift protection
  • Verge and road stabilisation
  • Building pit support
  • Embankment nailing
  • Reinforced ground
  • Rock stabilisation
  • Foundation anchorage/Building stabilisation
  • Building rehabilitation/underpinning
  • Slope support
  • Noise and avalanche prevention structures
  • Pipeline and mast foundations
  • Retaining wall rehabilitation
  • Tunnel construction
  • Tunnel preparatory cuts
  • Tunnel vaults
  • Anchoring of temporary forces in freestanding structures (building conditions)
  • Wall anchorage
  • Root piles In all of these areas of geotechnics the anchor force needs to be measured precisely and reliably.

Anchor force in geotechnics:

  • With ground anchors the anchor forces acting are between 200 kN and 650 kN
  • With rock anchors the anchor forces acting are between 300 kN and 1,500 kN In special applications the anchor force may be up to 5,000 kN. Why is the anchor force measured in geotechnics?
  • To shed light on the actual behaviour of the subsoil
  • For early detection of unforeseen deformation of the subsoil in combination with the stabilisation
  • To obtain measurement data including location- and time-dependent variability for assessment of stability
  • To check the design- and calculation basis
  • The basis for deciding how effective particular stabilisation measures are
  • The basis for deciding the scale of shuttering measures
  • Observation of long-term behaviour.Learn more about tecsis products for geotechnics with which the anchor force can be measured conveniently and precisely.

Contact us to learn more about tecsis products for geotechnics with which the anchor force can be measured conveniently and precisely.

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