Underground Mining Traffic tunnel construction
Two-lane road tunnel
In order to relieve traffic in the centre of Pforzheim, the plan is to build a western bypass around Pforzheim with reconstruction of the B 463 federal road. The Arlinger Tunnel is part of the first construction phase and is to be built as a two-lane, 1,347.9-m-long oncoming traffic tunnel (including two breakdown bays), which will be predominantly enclosed.
To the east of the above, a 1077.3-m rescue tunnel is to be built which will be connected to the main tube by four cross-cuts including widenings.
Furthermore, the contract includes the construction of the central operations centre which will be located in the vicinity of breakdown bay 2 and consist of the following structures:
- Ventilation tunnels
- Electrical cabling tunnels
- Connection tunnels
- Cross-Cut, and
- Exhaust air shaft
The excavation will involve both digging machines and explosives:
- Excavation cross-section for main tunnel = approx. 133 m² x 1,220 m =162,260 m³
- Excavation cross-section for rescue tunnel = approx. 18 m² x 1,023 m =18,414 m³
- + cross-cuts, breakdown bays and operations centre = approx. 21,000 m³
Construction began in June 2019 and will be completed in January 2023.