B+S
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Description
The Lahntal Bridge replaces the previous structure from 1960-64, which had already been repaired and reinforced several times in the past and has now reached the end of its service life. The Lahntal Bridge along the BAB A3 near Limburg has a length of 450.0 m, a width of 43.50 m between the railings and a height above the valley of approx. 60.0 m.
The separate superstructures are designed as haunched, longitudinally prestressed concrete continuous beams in composite construction over seven fields with spans of 45.0 m – 60.0 m – 75.0 m – 90.0 m – 75.0 m – 60.0 m – 45.0 m.
The superstructure cross-section consists of two single-cell hollow boxes for each directional carriageway with structural heights between 2.50 m in the center of the field and 5.50 m in the inner support axes, which are connected to each other by the roadway slab. The supports are arranged in pairs as reinforced concrete round supports for each superstructure and rigidly clamped into the superstructure in four axes. The structure is manufactured as an alternative offer using the cantilever method.
Special features
- The structure was nominated for the German Bridge Construction Award 2018
- The superstructures are manufactured using the cantilever method, with the exception of the edge fields
- The edge fields are manufactured on falsework
- The bridge piers are up to 60.0 m high
- The cantilever beam stabilizing supports are initially clamped into the superstructure and then separated by a longitudinal cut. They are then moved transversely for the production of the 2nd return carriageway
- Use of 4 cantilever carriages per cantilever beam
- The first inner pillars are stabilized by the superstructure against buckling in the transverse direction
Publications
Sonnabend, S; Franz, S; Steinbrück, C; Kerschensteiner, M:
Deformation calculation of the Lahntal Bridge Limburg.
In: Concrete and Reinforced Concrete Construction 2016, Issue 2, pp. 77-89
Sonnabend, S; Franz, S:
Spectacular cantilever construction at lofty heights – The Lahntal Bridge Limburg
In: Structural Engineering Art 2018, pp. 136-143
