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ENGINEERING AND GEODESIC WORKS AND EXECUTIVE SURVEY INSTALLATION OF BRIDGE STRUCTURES

Modern construction of bridge crossings is impossible without engineering and geodetic works. When transferring a project to the terrain, it is necessary to perform measurements in the horizontal and vertical planes with high accuracy. Geodetic works, to secure the design position and dimensions of both the entire sporida and its surrounding parts, to be carried out by procrastination before the construction of the bridge. Geodetic work during the construction of bridges and other structures is a complex of measurements, calculations and constructions on the ground, in which the design placement of structures must be ensured. The purpose of the article is to consider engineering and geodetic works during the construction of a bridge as part of a combined bridge crossing. At the stages of the construction of the bridge, the accuracy of the project is required, which will ensure geodesic work. These include: the breakdown of bridge supports at different stages of their construction, control of the erection of the superstructure and its installation on the support parts. To perform geodetic works such equipment as an electronic total station "Sokkia 630" and a digital level of the brand "Trimble DiNi" were used. The coordinates of the benchmarks were obtained and entered into the plan of the area. To work with them, anchors were driven into the asphalt and soil, photographed and entered into the documentation. On the pillars of the bridge were glued marks for the notch of the device, with a reflective effect. The data of coordinates and heights were entered into the memory of the total station. The method and procedure for geodetic works during the installation of bridge spans depend on their design and materials. At present, the most common methods of superstructures erection include hinged and semi-hinged assembly, assembly on the slipway, assembly on the shore with subsequent thrusting. When installing superstructures, the main tasks of geodetic support are to determine the straightness of the main beams and measure the so-called building lift. In the practice of bridge building, the degree of use of industrial construction methods is growing, that is, the manufacture of individual structural blocks with their subsequent connection at a regular place, which contributes to an increase in labor productivity and the quality of bridges.