Pilot project: Joint-sealing in the JGT tunnel in Stuttgart

Pilot project: Joint-sealing in the Johannesgraben tunnel in Stuttgart
The Johannesgraben tunnel is a six-lane tunnel at the beginning of the 831 motorway in Stuttgart-Vaihingen. It is 220 Meter long and was constructed in 1979.

There have been considerable problems for years with black ice and icicles, due to leaking joints. Various attempts at retro-sealing the joints in the past proved to be unsuccessful.

Stone Engineering was commissioned by Stuttgart Regional Council (RPS) to find out what was causing the leakage, investigate the state of selected joints and test the suitability of sealing technology developed in 2011 by the Stuttgart company, Wolf GmbH as a solution for the problem.