TECHNICAL | CONCRETE


FORMWORK FOR FEHMARN


Peri has delivered 10,000 tonnes of special large steel formwork for the massive concreting operation needed to construct the world’s longest subsea immersed tube tunnel, as the core infrastructure of the Fehmarn Project, to link Denmark and Germany


Above: Concept view of rail and road traffic using Fehmarn immersed tube tunnel between Denmark and Germany PHOTO CREDIT: FEMERN A/S


Immense precasting operations are to be performed in the giant factory-based offsite construction works, in Denmark, to construct what will be the world’s longest immersed tube tunnel. The almost 18km-long concrete tunnel on the Fehmarn Project will sit on the sea bed and within it will house large longitudinal cell voids, running the length of the tunnel and big enough to house separate road and rail infrastructure. Future road and rail traffic will go back and forth


between Denmark and Germany on the Fehmarn link, which will be a strategic connection in the expanding European transport network – especially for high-speed rail.


24 | July 2023


Fehmarn Project was in planning development for


years. Early on, the concept of a tunnel solution to create the important transport had to first overcome a competitive challenge from a bridge alternative. Then, plans developed further, and costings, and then progressively the client Femern A/S moved the project into the procurement phase. Always, the enormity of the concrete construction


challenge for such a world-beating immersed tube tunnel filled the minds. The colossal factory became the solution – a facility that is to outlive the project and serve future, but far smaller, immersed tube projects in the region. But, first, casting for the tunnel needs to take place.


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