Solexperts AG products

The FIM is used for continuous measurement of borehole axial deformations. Similar to the sliding micrometer and the Trivec, the FIM is based on the cone-sphere setting principle. Probe lengths from 1 to 5 m are available. In boreholes with measuring tubes for Sliding Deformeter, Sliding Micrometer or Trivec, sections can be equipped with FIM(s) for continuous measurements. The FIM is fixed in the measuring tube between two measuring marks and connected to the data acquisition system.

For measuring axial deformations and displacements in boreholes - the Modular Extensometer is a technical advancement of our proven Uni-Rod Extensometer. Electrical displacement transducers are used for automatic measurement. For manual measurement, a mechanical meter, a digital caliper or a portable electronic sensor with a digital reading device can be used.

With the Reverse Head Extensometer, deformations can be continuously observed during excavation in front of the tunnel face or during the removal of slopes or the excavation of excavation pits. The modular design based on a chain of single extensometers provides a large number of measuring points in small diameter boreholes. The big advantage compared to other extrusion measuring systems is the continuous measurement of deformations during tunnelling or excavation. The manual readout of the stored measurements is done in a few minutes with a portable PC or PDA. The recording rate for the measured values of the individual displacement transducers is freely selectable.

Joint extensometers are used for displacement measurements in structural joints and cracks. The change in distance perpendicular to the joint and the vertical and horizontal shear movements are determined by suitable arrangement and combination of joint extensometers. The sensors are linear potentiometers encapsulated in a stainless steel housing to be water pressure-tight with a measuring range of 50, 100 or 250 mm and a measuring accuracy of +/-0.02 mm. The measurement is carried out either manually with a portable measuring device or automatically with a data logger.

The portable distometer is mainly used in tunnel construction for very precise convergence measurements. An invar steel wire is clamped between measuring bolts with the distometer with a defined force and the change in length compared to previous measurements is determined. The measuring accuracy is +/-0.05 mm + 1*10E-6 x the distance. The measuring range is 100 mm.

Surface extensometers are used to measure displacements on surfaces over distances of 1 to several metres. The sensors, which are encapsulated in a water pressure-tight stainless steel housing, are usually linear potentiometers with a measuring range of 50, 100 or 250 mm and a measuring accuracy of +/-0.02 mm.

The curvometer is used to measure changes in the curvature of component surfaces. The deformometer measures distance changes on component surfaces on a base length of 0.5 or 1 m. The measurements can be used to calculate the acting normal force and moment stress on components when they change elastically. The measurements can be used to calculate the acting normal force and moment stress on components if they deform elastically and their stiffness EF and moment of inertia EI are known. The measuring range over the base length of 500 mm is 5 mm for both measuring systems and the measuring accuracy is +/-0.003 mm.

The digital inclinometer probe is used for section-by-section displacement measurements radial to the axis of the measuring tube. The probe has a base length of 0.5 or 1.0 m. The vertical inclinometer is used in vertical boreholes and the horizontal inclinometer in horizontal boreholes. These probes can be integrated into the system of displacement measurement along lines (combination with measuring cable, measuring rod, reading device, field data acquisition, Trivec and Trical software).

The inclinometer measuring line is formed by the measuring tubes installed in ground, rock or structure. Standard connecting tubes made of HPVC with internal grooves are available for guiding a borehole inclinometer measuring probe. The connection between the individual measuring tubes can optionally be designed with a telescopic coupling.

Displacement measurements along measurement lines (boreholes) provide information about the deformation behaviour of the rock or structure as well as about the interaction between the structure and the ground. With the sliding micrometer, displacement and deformation profiles in soil, rock and structures are precisely recorded metre by metre along arbitrarily aligned measuring lines. The measuring accuracy in the vertical direction is ΔZ +/-0.002 mm/m and the measuring range extends over +/-10 mm/m.