Improvement of metrological measurements of bridge crossings at waterworks when studying non-destructive testing methods

Abstract The article considers the main parameters of applying the modern methods of metrological measurements of bridge crossings on water channels during research with non-destructive testing methods. Instrumental surveys of water supply facilities in Russia showed that in some cases their effectiveness, operational quality and reliability are insufficient, which is associated with violations of normal water supply systems functioning. In modern conditions, with limited public resources allocated for the reconstruction of water facilities, problems of optimizing the requirements for metrological support of the developed non-destructive testing measuring instruments and the unification of observation technologies are of particular importance. The most common are defects of an internal nature, leading to the disruption of waterworks normal functioning. We can conclude that violations of the butt joints of prefabricated elements, breaking and breaching of walls in various zones, cracks, sliding and subsidence of elements relative to each other lead to disruption of the normal operation of bridge crossings. This raises problems such as the loss of scarce irrigation water, rising groundwater levels, waterlogging and salinization of irrigated lands. The solution to these problems should be based on the mandatory consideration of reliability requirements in design, construction and operation. The purpose of research with non-destructive testing instruments was to detect possible defects in concrete bridge crossings and determine the condition of reinforcing bars. These field studies were carried out using the OKO-2 GPR and the electronic concrete strength measurer IPS-MG4.01. Comparison of the vertical displacement profiles of bridge crossing bearing components through the waterworks horizontally along and across the bearing elements revealed insignificant internal changes. A metrological support system for research by non-destructive methods for monitoring bridge crossings at waterworks is necessary to achieve unity and the required accuracy, completeness, timeliness and efficiency of measurements.