B+S
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Description
As part of the PPP project, the Miltenberg Main Bridge is being rebuilt. The new construction became necessary due to the poor condition of the existing steel composite bridge from 1949. Instead of the previous 6-span bridge, only a two-span bridge with one pier in the river will be built. This will allow for a later expansion of the directly adjacent lock with a substantial widening of the waterway.
Our special proposal for a prestressed concrete bridge instead of the tied arch bridge reference design is being implemented. The boundary conditions of the structure, namely the alignment of the road being carried over and the requirements for the clearance gauge of the waterway in the Main, necessitated a very slender superstructure. The slenderness in the river field is 39.6. In order to keep the clearance in the area of the Main clear during construction, the superstructure had to be built in a position raised by 2.30 m.
Regarding the design of the PPP structure, we are working with the architect J.-J. Zimmermann, as we have already done successfully with the Miltenberg Main Bridge.
Special features
- Two-span, haunched prestressed concrete bridge with spans of 91 + 91 m, foundation with large bored piles
- Box girder cross-section with a structural height of 2.30 – 4.55 m (slenderness 20 – 39.6!)
- Manufacture in two construction phases on a temporary support structure freely spanning the waterway; manufacture of BA 1 in a position raised by 2.30 m (due to the clearance gauge of shipping) and lowering of the 120 m long section
- Temporary support structure foundation with wooden driven piles that remain in the subsoil and are intended to rot until the later lock expansion and partly on the existing pier wall from the 1930s; foundation in the river with concreted well rings
- Construction of the bridge pier with a surcharge in the Main connected with a pontoon
