METHOD AND DEVICE FOR DETERMINING THE TENSILE OR COMPRESSIVE STRESS IN A FERRO-MAGNETIC MEMBER SUCH AS A PRESTRESSING, TENSION OR COMPRESSION ORGAN USED IN CIVIL ENGINEERING

摘要

The invention relates to a method for the determination of train - or compressive stresses in a ferromagnetic element, in particular a clamping -, train - or pressure element for the construction sector, wherein at least in a specific point of the magnetization curve of the ferromagnetic element, the magnetic field strength h at a predetermined value for the magnetic flux b and / or the magnetic flux b at a predetermined value for the magnetic field strength h and / or the gradient of the magnetization curve at a predetermined value for the magnetic flux b or the magnetic field strength h is detected directly or indirectly, for the material and / or the type of the ferromagnetic element, a calibration process is carried out in which, for the at least one point of the voltage dependence of the detected parameter in the case of the respective predetermined value for the magnetic flux b or the magnetic field strength h is determined, and wherein the value of the train - or compressive stress in the ferromagnetic element or its change by means of a comparison of the value of the detected parameter and the associated calibration is determined as a function of speed. The invention further relates to a device, which is particularly suitable for carrying out this method.