Sustainable High-Speed Railway Bridge Construction over the Danube-Tisa-Danube Canal

As part of the project ``Modernization, reconstruction, and construction of the railway Belgrade - Subotica state border (Kelebija),'' a bridge designed for speeds of up to 200 km/h was constructed over the Danube-Tisa-Danube canal. The bridge, a two-track structure, features a truss continuous support on three spans totaling 154 meters (42+56+56). In the plan view, the bridge appears straight with straight abutments and skewed middle piers. The height between the top and bottom chord measures 9.0 meters, with a spacing of 12.5 meters between the main axes. The main girders are connected to cross beams at the bottom chord level and to wind bracing at the top chord level. The cross beams, composite members made from welded I-profiles and a concrete deck, provide additional support. The steel structure is supported on columns via spherical bearings. Due to operational requirements of the bridge, it became necessary to install a shock transmitter to absorb horizontal forces from braking, starting, and seismic activity. The bridge is supported by piles with a diameter of 1200 mm and lengths ranging from 20 to 23 meters. To construct the middle pillars of the bridge, cofferdams were necessary in the canal. The steel structure was initially installed on the shore and then moved into its final position through longitudinal launching, facilitated by special temporary supports. The launching process involved the use of 12 sets of hydraulic presses and a launch grid beam to bridge the span during the structure's stretching. This innovative construction method represents a new trend in bridge construction, demonstrating a commitment to sustainability throughout the project. The use of sustainable practices in both the design and construction phases ensures that the bridge aligns with modern environmental standards while providing essential infrastructure for the region.