Closing a Gap with DYWIDAG Strand Anchors and GEWI^® Bar Anchors: The B10 Rosenstein Tunnel in Stuttgart

The B10 Rosenstein Tunnel in Stuttgart, Germany is part of a road construction project that will close a gap in the development of the B10 Federal Road between the town of Zuffenhausen and Stuttgart East. Thanks to the construction of the tunnel, Prague Street can be reduced from 4 to 2 lanes, which will significantly reduce traffic congestion in the affected districts and will allow the creation of new green space.

With a total length of approximately 1,300m, the new road tunnel passes below Rosenstein Park and parts of the Wilhelma Zoological and Botanical Gardens. After tunnel completion, which is scheduled for 2020, traffic will be run through both tunnel tubes on two lanes in each direction.

At its deepest point, the tunnel is located 20m beneath Rosenstein Park. 750m of the two tunnel tubes are advanced from the Neckar River in the direction of Prague Street using the underground method. The tunnel is accessed via an approximately 40m long approach adit. Thanks to the underground method, interferences with Rosenstein Park and Wilhelma Zoo can be avoided.

The open cut method is only used for the areas that will connect the tunnel to Prague and Neckartal Streets. The excavation at Prague Street accommodates both tunnel tubes as well as the new operational building and was therefore excavated to a depth of up to 18m.

To stabilize this excavation, DSI supplied 532 temporary Type 3-0.6" and 4-0.6" DYWIDAG Strand Anchors with a total length of 9,110m. The DYWIDAG Strand Anchors were installed in the excavation walls in lengths of 10 to 22m. Furthermore, 566 16 to 40mm Ø GEWI^® Bar Anchors with a total length of 4,367m were used. The GEWI^® Bar Anchors were installed in individual lengths from 2 to 14m.