Extradosed bridge in Kurow over Dunajec
The bridge project was created as part of the master thesis, focusing on BIM methodology and its applications in infrastructure projects.
On the basis of obtained materials (the detailed design of the bridge), the author made a parametric 3D+ model of the structure (using additional applications cooperating with Tekla Structures) to be used for static calculations, based on the mutual exchange of data between programs. The presented bridge is currently being built in Malopolska Province, Poland. The bridge will be located in Kurow and will be a crossing over the Dunajec River, along the DK75 national road connecting Nowy Sacz with Krakow.
The designed bridge will be the third longest extradosed bridge in the country and among the best ex-d bridges in the world. The theoretical span lengths of the bridge are 100.00 + 200.00 + 200.00 + 100.00 m. The bridge is located in a vertical arch with a radius of 15000 meters, which causes a height difference between the central middle support and the abutment of 3.00 m. One lane in each direction and a functional pavement with pedestrian and cyclist traffic as well as a technological were designed. To enable bridge inspection, a revision trolley was designed to monitor the bridge span. The bridge was originally intended for erection on span by span with adjustable scaffolding, while the contractor changed the technology to allow for incremental launching.
A single-chamber box section with a top flange width of 16.90 m in span zones and 21.56 m in pylon zones has been designed. There is a pylon on each intermediate support, rising above the road level to a height of 22.77 m. There are two suspension planes in a fan arrangement, where in each pylon, on one side, 9 extradosed cables are anchored, based on the pylon via saddles. The girder’s overall height is constant and equal at 4.10 m. A typical bridge cross-section has a thickness of 40 cm webs and a bottom plate with a thickness of 25 cm, which gradually thickens, reaching respectively 120 cm and 100 cm within the pylons.
The bridge was prestressed longitudinally and transversely, with and without bonding tendons, as well as being prestressed with trapezoidal external tendons inside the box section. In order to transfer the vertical component from the compression by extradosed cables to the structure, cable-stayed diaphragms were designed that were transversely prestressed, as were the transverse beam. The foundations of the bridge were designed using large-diameter drilled piles based on rock.
The volume of concrete (class C80 / 95) necessary for erecting the bridge is 12600 m3. The bridge was equipped with all the necessary elements, starting from pavement anchors, parapet boards, drainage, through to anchoring of prestressing cables and ending with venting elements of the box section.