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Deep foundations for the railway bridge over the Eyach, Balingen

The 27 m long steel truss bridge over the Eyach near Balingen-Schmiden, which was put into operation around 1925, is one of the most dilapidated railway overpasses in Germany. Until April 2023, Deutsche Bahn is constructing the new replacement on the Zollernalbbahn between Engstlatt and Balingen. Stump-Franki Spezialtiefbau was commissioned by the PORR Saaldorf-Surheim branch to carry out the specialist civil engineering. Adherence to deadlines was the top priority for this project.

New bridge over the Eyach. © PORR

The main work started in January 2022. Stump-Franki carried out the pile foundation and the slope stabilisation with jetcrete in natural stone look as part of the special civil engineering work. The soil nails had to be drilled to a height of 10 m, and the large bore piles were constructed on the 12 m high railway embankment. In total, the special civil engineering experts installed 1,000 m permanent strand anchors, 43 large bore piles, 540 m micro piles, 4,000 m permanent soil nails as well as 800 m2 jetcrete in the project.

Despite the challenge, the work runs smoothly in close cooperation

Due to the abutments on both sides of the Eyach, the conditions on the construction site were very cramped and posed several challenges. On the small construction site, the trades large-diameter bored piles, permanent anchors and permanent shotcrete lining were carried out in parallel at times. Despite the obstacles, adherence to deadlines had top priority: due to the closure of the railway line and in time for the Balingen Garden Show 2023, the train connection for visitors should function smoothly. Thanks to years of experience and the individually selected foundation techniques, the customer requirements were implemented economically and safely.

Services from a single source: bridge construction work by PORR

Parallel to the special civil engineering work, the PORR Saaldorf-Surheim branch constructed the new steel superstructure south of the railway line. From August to October 2022, the old bridge was demolished and the abutments of the new railway bridge were installed. At the end of October, the steel superstructure of the new railway bridge weighing around 170 tonnes was lifted into place. Work on the bridge is scheduled to be completed by April 2023. The bridge is one of around 900 bridges that are receiving a makeover as part of DB's modernisation programme.


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