The New Bechlingen Viaduct in the Course of the Motorway A 45

Due to deficits identified during the recalculation of the Bechlingen viaduct on the A 45 the two substructures of the existing arch bridge had to be replaced by a new construction. For this purpose, the existing bridge structure was dismantled with the help of a demolition scaffolding. The new bridge structure consists of a geometrically complex three-span continuous girder system in prestressed concrete construction with two separate superstructures. The very wide cross-section required in the course of the six-lane expansion is designed as a two-cell prestressed concrete box girder with internal and external prestressing. Due to the section-by-section production on a scaffolding which was ground supported or suspended from the joints and the concreting of the cross-section in four sections, the interaction between the structure and shoring with regard to the load-bearing behavior had to be investigated in detail. This contribution deals with special features of the design and construction of the new bridge structure as well as the demolition of the existing bridge.