B 463 West Bypass of Pforzheim / Arlinger Tunnel

Project objectives

In order to relieve traffic in the centre of Pforzheim (Baden-Württemberg), the construction of the Pforzheim west bypass with the new construction of the B 463 federal road is planned. Construction section 1.03 with the Arlinger Tunnel is part of this bypass road.

Project description

The Arlinger Tunnel was built as a two-lane tube traffic tunnel (including two layby-niches) in NATM construction method. To the east of the main tunnel is a rescue tunnel, which is connected to the main tunnel with four cross passages including widenings. In the middle of the tunnel, two service and ventilation caverns including an exhaust air shaft were built. In the course of construction, there are also two pre-cuts with a maximum embankment height of approx. 15 m (north) and 20 m (south), which partly lie in the solid rock of the shell limestone.

Project data

• Arlinger Tunnel L = 1,347.90 m, rescue tunnel L = 1.007.30 m
• Embankment height: north approx. 15 m, south approx. 20 m
• Construction costs approx. 93 million EUR

Services

• Execution design of the open cuts including the necessary slope stabilisation
• Detail design of the tunnel structures
• Structural analysis for cuts and tunnels