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Monday, 25 January 2021
Measurement of forces below anchor head

Purpose: In the context of the geotechnical monitoring of deep construction pits during the construction the forces in anchors and cross-beams have to be measured. According to applicable standards for permanent anchors ensuring the stability of the earth and rocky slopes, their monitoring is necessary. For the measurement of forces in rod and cable anchors, hydraulic dynamometers are most commonly used, which allow direct measurement of force in kN on the basis of precisely defined ground plan of the sensor. The dynamometers of the Company Glötzl from Germany are characterized by robust construction and easy assembly. They are insensitive to the eccentric action of the force and have a high zero constant, which predisposes them to long-term measurements.

Description: The dynamometer consists of two steel discs with a central hole. The cavity (pressurised space) between the discs is filled with hydraulic fluid. The force in the anchor can be read directly on the calibrated manometer or remotely: hydraulically (principle of compensatory valve), or electrically (electrical converter). The delivered component of the dynamometer is one levelling plate. If the dynamometer cannot be attached to a planar area, it is necessary to use two levelling plates.

Measurement accuracy:

Temperature error:

Measurement range:

Hole dimensions (according to the load):

Cell width:

Cell diameter:
± 1% with manometer (electric transducer ± 0,5%)

1,2% of load value at temperature difference of 20°C

0 -160 / 250 / 500 / 750 / 1000 / 1400 / 2000 / 3000 / 5000 kN + overrange 10%

diameter of central hole 35 - 160 mm

28 - 80 mm

145 - 408 mm

Dynamometer hydraulickýHydraulic dynamometer with eletrical converterDynamometer vibračnýVibrating wire dynamometerdynamometer GlötzHydraulic dynamometer with manometer