METHOD OF COMPREHENSIVE MONITORING OF STRESS-DEFORMED STATE OF DAM CONCRETE Russian patent published in 2014 - IPC G01L1/10 

FIELD: measuring instrumentation.

SUBSTANCE: invention refers to measurement equipment and can be used for monitoring of stress-deformed state of hydrotechnical facilities, such as dams of hydropower stations, and for monitoring of concrete endurance in pre-stressed reinforced concrete structures during operation. Method of parameter monitoring in dam concrete by measurement of parameters of signals transmitted through concrete of a dam gallery from two generators (HF signal generator and seismic wave generator). Generator signals transmitted through concrete are registered by seismic wave sensors and electromagnetic filed sensors in the form of two induction detector coils in orthogonal position. Phase shift (dissipation factor) of HF signal in concrete is calculated by measurement results for reactance voltage in induction detector coils at the sites of monitored structure area. Concrete humidity factor in the area of sensor pairs (electromagnetic and seismic sensors) is determined by the value of phase shift. Concrete endurance is calculated with account of concrete humidity factor by results of measurement of seismic wave duration and propagation speed at sections between sensor pairs of the monitored gallery area.

EFFECT: enhanced precision of concrete endurance determination in structures during operation.

2 cl, 1 dwg