JUSTIFICATION OF THE ACCURACY OF GEODESIC WORKS DURING THE INSPECTION OF THE BRIDGE IN RIVNE

Abstract

Bridges are important structures for the safe operation of roads, railways and pedestrian areas. The purpose of this work is to substantiate the accuracy of geodetic works during the inspection of bridges. There are no requirements for the accuracy of such works in state construction standards. The relevance of this problem consists in the fact that it is necessary to perform any geodetic work with optimal accuracy, which, on the one hand, excludes excessive costs for geodetic equipment, and on the other, guarantees the safe functioning of the engineering structure. Based on such calculations, it is possible to choose geodetic equipment with appropriate characteristics and select measurement methods. Three options for calculating the required accuracy of geodetic measurements are considered: by the deviation of the top of the piles from the design position in the plan, by the deviation of the top of the bridge supports from the vertical and by the limit deflection of the beams-slabs of the bridge floor. As values for the marginal errors of geodetic work, it is suggested to choose the smaller value of the three options. The developed method was tested during the survey of the bridge is on Joliot Curie Street in Rivne. Based on the calculation results, the ground survey method chosen using the free station method with an electronic reflectorless total station Leica TCR 405 ultra, which provides the necessary accuracy and is the most economical. All elements of the bridge have been coordinated and the geodesy survey of the upper part of the bridge and the surrounding area has been carry out. According to the results of geodetic works, the tilts of the column-piles, the deflections of the longitudinal load-bearing beams-panels were calculated, and the plan of the top of the bridge was constructed. So, the geodetic work performed provided a high-quality examination of the bridge and allowed construction engineers to formulate the measures necessary for the further safe operation of this bridge structure. The scientific novelty and practical significance of this work consists in the fact that a methodology has been developed for substantiating the accuracy of geodetic works during the inspection of bridge structures, which guarantees the safe functioning of the bridge structure.