Pilot Project: Applying the Tunnel-in-Tunnel Method on DB electrified Routes

This report deals with the refurbishing of the Petersberg Tunnel. In this connection, for the first time within the scope of a pilot project, the tunnel-in-tunnel method was applied on an electrified line belonging to the DB. The tunnel cross-section was enlarged within the scope of the excavation. These activities were executed with the aid of a tunnel enlargement system (TES). Towards this end, the existing overhead line for electrification of the route had to be integrated in the excavation. Once the driving operations had been completed, the tunnel inner shell made of reinforced concrete was produced. Thanks to this project the spectrum of refurbishing tunnels has been considerably expanded, as the method can be deployed for other projects on the electrified route network.

1 Deploying the Tunnel-in-Tunnel Method

for Deutsche Bahn

The tunnel-in-tunnel method has already been successfully tried out and further developed on several non-electrified routes in regional transportation. In this method, the tunnel cross-section is expanded by drill+blast or cutting tools with trains services still operating and a new reinforced concrete inner shell installed according to the valid requirements of the code of practice. When construction starts, the track is relocated to the centre of the tunnel and services run in alternating directions for the duration of the scheme....

Related articles:

Issue 03/2014 Germany

Schlüchtern Tunnel: Two Bores for a busy Rail Route

The 3,576 m long Old Schlüch- tern Tunnel on the main line between Frankfurt and Fulda was opened in 1914. With a total of 260 passenger and goods trains daily it was one of Germany’s busiest rail...

more
Issue 05/2015 Switzerland

Rosshäusern Tunnel Breakthrough

An important phase has been completed in the construction of the approximately 2 km long, two-track Rosshäusern Tunnel on the line from Berne to Neuchâtel. After the decision to change the method of...

more
Issue 07/2011 Germany

Redeveloping the Schlüchtern Tunnel

The New Schlüchtern Tunnel is nearly 4 k m long and possesses 9 m internal diameter. It was driven using a tunnel boring machine (TBM) at a distance of 50 to 90 m from the existing tunnel [1-4]. As...

more
Issue 05/2014 Germany

New Kaiser Wilhelm Tunnel opened in April

The Deutsche Bahn opened the new single-track Kaiser Wilhelm Tunnel on the Moselle route near Cochem on April 7, 2014. Work on the new 4242 m long tunnel started four years ago. It was produced by a...

more
Issue 04/2012 France

Construction on the Vosges Tunnel started

The 4,019 m long Saverne Tunnel will be provided with 2 single-track bores, which will be linked every 500 m by cross-passages. This is where the Vosges range is at its narrowest. The 2 tunnel bores...

more