Bridge repairs along the A95 and the A952

Unlike most other motorways in Germany, the A95 and the A952 are not directly connected to the rest of the German motorway network. They are nevertheless important arteries for Munich and the region to the south of it.

On weekdays, it is mainly commuters from the Starnberg region who use the two motorways on their way to work in the state capital. 60,000 vehicles use the section between the Starnberg junction and the Munich conurbation every day. On weekends, public holidays and during the school holidays, tourist traffic moves in large quantities to and from the recreational area around Lake Starnberg. On both sections, Rädlinger Ingenieurbau therefore had to reconcile repair work on ten aging bridges with as little impairment to traffic as possible.

Works on A952: from smaller repairs to bridge construction

The five bridges along the A952 differed enormously in terms of their need for repair. While only minor repairs and maintenance were required on two bridges, the other three showed signs of significantly greater damage. Two of the three could be maintained through renewal and strengthening measures to bridge parapets, surfaces, superstructure concrete and reinforcement. The third was no longer in a state where it could be repaired. In order to maintain the flow of traffic, initially only half of the bridge area of approx. 700 m² was demolished and built from scratch. The traffic ran across the remaining half during this time, safeguarded by a complex Berlin-type support system with bracing. Only for the demolition works themselves was the road completely out of use – for a weekend on each occasion. The construction required a total of about 1,850 cubic metres of concrete and 200 tonnes of structural steel. By doing additional night and weekend shifts, the Rädlinger Ingenieurbau team managed to complete all construction work between April and the November deadline, despite the challenges faced.

A95 consortium: concrete repairs with complex traffic-safety issues

In the first construction phase from April to August 2014, the highway agency for South Bavaria closed the road in the direction of Garmisch-Partenkirchen completely and diverted all traffic onto the other carriageway using extended contraflows. In order to repair the five bridges, the Rädlinger Ingenieurbau staff demolished the entire superstructure, renewed it with semi-finished parts using about 1,600 m³ in concrete topping and sealed it, using approximately 8,000 tonnes of asphalt for the new surface. Deploying high-pressure water jets, they stripped away 200 cubic metres of concrete from the abutments, down to the existing reinforcement layers, then built in a further layer of reinforcement with anchor bolts and concreted a new concrete facing. Despite the extensive traffic safety measures around the site, traffic was flowing normally again two weeks ahead of schedule. The second phase of the consortium project on the road towards Munich is scheduled to run from May to October 2015.

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