Aicher Park and Mangfall bridges on the bypass B15 in Rosenheim have been formally opened for traffic on 21 September. They are an important part of the around 11-kilometre-long town bypass which will ease transit traffic through the inner-city of Rosenheim on the highly frequented north-south route. Participating on site at the celebration were amongst others Bavarian prime minister Markus Söder, Christin Bernreiter, state secretary for housing, building and transport, and Michael Theurer, parliamentary state secretary at the Federal Ministry for Transport; in their speeches they highlighted the important contribution the route makes to a robust Bavarian transport network.
The section comprises two structures: structure 1 crosses over the road Renkenweg, river Mangfall and the Mangfall canal, and structure 2 over Georg-Aicherstrasse, Aicher Park, Äußere Oberaustrasse as well as railway installations. Structure 1 is implemented as a cable-stayed bridge with composite steel pylons reaching over three spans. Structure 2 is a composite steel bridge built as multi-span, continuous deck bridge made of tightly-welded hollow steel boxes.
Big challenges during construction of the bridges were the soft and instable clay soil as well as that the bored piles don’t reach load-bearing soils. Together with experts from the Technical University Munich a solution was crafted which had never been implemented before: Depending on the load on each pile, a certain number of columns is anchored into the ground. This had to be implemented very carefully and considerately to maintain the soils load transmission. So-called drainage and displacement columns further improve the clay soil’s load-bearing capacity. The mixed foundation consists of bored piles, drainage and displacement columns with a maximum length of 50 metres and a sheet pile box each which is on average 10 metres deep.
After successfully completing construction sections 2 and 3.1, construction at bypass B15 will enter the next stage. The entire section is planned to be finalised next year.
For more information on the project and SSF’s scope of services, follow this link.
