FIELD: process engineering.
SUBSTANCE: invention relates to jacking of reinforcement strands in the channel. Separate stress sensor is arranged every strand to measure separate jack force for every separate strand. After jacking, said sensors can be withdrawn or left thereat for constant monitoring of strand jack. Said sensors can be calibrated by jacking the strands to equal jack using separated jacks and by normalisation of signals from every sensor to know magnitude of equal jack. Besides, additional calibration can be made before measurement of total load.
EFFECT: uniform jack.
22 cl, 12 dwg
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