Die neue Allerbrücke bei Verden

The new Allerbrücke near Verden

An innovative new bridge along the dual track DB-railroad line Wunstorf-Bremerhaven replaces the already heavily damaged existing bridge. The new bridge inserts itself harmoniously into the surrounding country side. The continuous, slender trough bridge convinces through its appropriate material application and moment-diagram formed webs, which are connected on both sides with the orthotropic steel deck. The stiffeners of the web in the region of the main span across the Aller are arranged in a fan-shape, following the flow of forces. To harmonize the alignment of the approach ramp, the height of the outer steel girders remains constant and the arrangement of the web stiffeners is purely vertical. The bridge superstructure is supported by bearings on slender pier walls and abutments, where the fixed point in the longitudinal axis is located on the northern pier. The new Allerbrücke will be assembled in parallel position next to the existing bridge structure, without significant disruption to the running rail traffic. The chosen incremental launching method allows a manufacturing process that is largely independent from flood waters, which means only a minimal intervention in the environment.