At the beginning of 2022, Metrostav Infrastructure began construction on the second-to-last segment of the D3 motorway between České Budějovice and Austria - the 0311 Třebonín - Kaplice nádraží section. Three bridges currently under construction within this motorway segment have been submitted for the competition. These include a frame motorway bridge and a pair of arch overpasses.
The bridge SO 205 transfers the D3 motorway over the watercourse from the Šindelář pond. This bridge has been designed as a closed reinforced concrete frame structure. The bridge is skewed at an angle of 53.7°, with a clearance of 4.0 meters. Its total width spans 34.265 meters, and the minimum height of the bridge reaches 3.4 meters. The wings of the bridge are designed as distinct flat-based angular walls.
The arched overpasses support two roadways with a clear width of 5.0 meters over the motorway, where it passes through a deep cut in the bedrock and semi-sedimentary rock. These overpasses feature standardized cross-sections for their reinforced concrete superstructures. The arches are designed as double-joint arches with a constant rectangular cross-section measuring 700x2400 mm. Both the inner and outer piers have a rectangular cross-section of 400x2000 mm. The inner piers are equipped with notched joints on both sides, while the outer piers are firmly connected to the foundations and linked to the bridge deck by notched joints. The bridge deck consists of a 600 mm high reinforced concrete beam, 2400 mm wide, with inlaid cantilevers varying in thickness from 250-350 mm and extending a length of 1850 mm.
The total length of the bridge SO 209 is 67.55 m. The arch's span is 42 m, and the rise is 5.525 m (L/7.6). The individual spans of the bridge deck are 5.80 m + 6.40 m + 7.20 m + 15.70 m (connection with the arch) + 8.40 m + 8.20 m + 9.30 m. The bridge is designed as fully integrated, and the abutments are based on piles with a reduced shaft to allow for longitudinal expansion.
The total length of bridge SO 212 is 64.51 m. The span of the arch is 42.25 m, and the rise is 4.3 m (L/9.8). The span of the individual spans of the bridge deck is 7.50 m + 7.00 m + 7.00 m + 18.41 m (connection to the arch) + 6.50 m + 6.50 m + 6.00 m. The endings of the bridge are designed as semi-integrated without bridge joints. The bridge deck is rigidly connected to the wings and is supported on a flat-based reinforced concrete abutment via elastomeric bearings.
In this project, a combination of graphic programs was used to create a 3D model, including its reinforcement using the connection of Rhinoceros, Grasshopper and Tekla Structures programs. The reinforcement of the structure is parametric using the connection of Grasshopper and Tekla programs. At the same time, common 2D drawing documentation was created with the help of mentioned programs.
