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On 16 June, the HABAU GROUP, Swietelsky and ASFINAG celebrated the final incremental launch of the third of three incrementally launched bridges as part of the S31 Burgenland motorway.
In the course of the safety expansion of the S31 Burgenland motorway to Weppersdorf, significant headway was made on 16 June: the last incremental launch at the Sieggraben viaducts has been successfully completed. On behalf of ASFINAG, this milestone was achieved in a consortium made up of the HABAU GROUP and Swietelsky. An impressive example of technology, precision and partnership-based cooperation in line with what’s best for the project. Overall completion of the project is envisaged for December 2026.
“With the successful conclusion of the last incremental launch, the S31 Sieggraben viaduct project marks a further milestone in the expansion of Austria’s infrastructure – and proves that visionary engineering, partnership and environmental awareness go hand in hand”, stated Hubert Wetschnig, CEO of the HABAU GROUP.
Three incrementally launched bridges and a shoring structure – engineering skill on a grand scale
For the new Oberpullendorf carriageway, a total of four bridge support structures are being erected, three using incremental launching and one on a shoring system. While the traffic in the direction of Eisenstadt continues to be guided across the existing bridges, the new construction of the viaducts marks a crucial step in increasing road safety on the S31 – in future, head-on collisions will be effectively prevented by the physical barrier separating the carriageways.
The incremental launch itself is a logistical and technical masterpiece: behind the abutment, sections measuring up to 24.5 metres in length are concreted, prestressed and hydraulically moved into the end position via pillars up to 56 metres tall – with the 465-metre-long bridge structure growing by around 24.5 metres each week. The utmost precision is required when the launching teams position PTFE sliding plates on the pillars and the box girder, weighing up to 11,000 tonnes, is set in motion with millimetre accuracy.
The fourth supporting structure – a double tee beam – was assembled in eleven concreting sections using a shoring structure. Particularly challenging: the first bridge segment runs above the busy Sieggraben exit and required a specially adapted, particularly low framework construction.
The substructure of the new bridges is equally impressive: around 13,700 metres of bored piles with a diameter of 1.2 metres were set into the terrain, which in parts is difficult to access. The erected pillars of up to 56 metres in height were created using automatic climbing formwork – with weekly progress of up to ten metres.
Alliance agreement as a pioneering model
A further novelty is the construction contract: for the first time with a project of this magnitude, a specifically developed ASFINAG alliance agreement was applied. Risks and opportunities are borne jointly, and remuneration is settled transparently according to the open-book principle. The goal: best possible quality, economic efficiency and the constructive handling of challenges – entirely in line with the “best for project” concept.
Focus on sustainability
As with all construction projects by the HABAU GROUP, this one is no exception: sustainability and environmental compatibility are at the forefront. The entire construction phase is accompanied by water permit, geotechnical and ecological supervision. Temporarily necessary forest clearings are being offset with afforestation across roughly 6,000 square metres.
