Replacement and new bridge construction BAB A73 Bamberg-Lichtenfels

Another milestone successfully completed

The second shifting of the bridge north of Bamberg was successfully completed by our technicians on the weekend 17th/18th April 2020.

In the course of the replacement and reconstruction of the Bridge 93b of the BAB A73 Bamberg-Lichtenfels, the steel construction (approx. 1,400 tons) of the steel composite structure was shifted by 45 m over the B4 and the railway line to be crossed with the beginning of the closing break of the German Railway on Saturday and reached the auxiliary pier as planned.

On the following Sunday, the remaining shift took place with a total of 70 m to abutment 40. During the next weekend operation the bridge was then stacked by 1.30 m to its intended final position.

The composite steel bridge consists of two separate superstructures (section 1, Lichtenfels carriageway and section 2, Bamberg carriageway). The two separate superstructures are antimetrically designed, geometrically particularly challenging trough structures made of steel with a concrete roadway slab. The total length of the three-span bridge is 150 m with a total superstructure width of 37.20 m. For the entire steel construction of the structure 2800 tons of steel are required.

 

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Riederich railway overpass

Successful lifting of the new railway bridge

In Riederich, two thick plate bridges with an individual weight of approx. 37 tons were placed on the new abutments. The railway overpass consists of two separate superstructures. Each superstructure is designed as a trough bridge with thick plate. A walkway is attached to one side of each of the two superstructures. The span of the bridge is approx. 6.10 m, the construction height is 0.8 m. Each of the superstructures has a width of 4.48 m. The footpaths have widths of up to 1.19 m.

The bridge sections have been placed on top of addition stacks and remain on these until the bearings have been cast. Afterwards the footpaths were added.

In this state the bridge is now waiting to be moved to its final position together with the two abutments.

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Railway overpass Hattenbergstraße, Mainz

Lifting of the new railway overpass

In the night from Good Friday to Saturday the lifting of the new railway overpass over the Hattenbergstraße in Mainz took place.

During the day, two 500-ton cranes were used to dismantle the temporary bridges before the assembly of the new bridges could begin in the evening.

The railway overpass consists of three separate superstructures. Each superstructure is designed as a trough bridge with thick plate.  On each of the two outer superstructures a walkway is attached on one side. The span width of the bridges is approx. 22.00 m, the construction height is 1.5 m. Each of the superstructures has a width of approx. 4.50 m. The footpaths have widths of up to 1.35 m.
This resulted in unit weights of up to 135 tons.

The bridges were set down on allowance stacks and then the bearings were cast.

The Hattenbergstraße railway overpass went into operation on schedule.

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