Renewal of electrical power systems in the Horchheim Tunnel.
As part of the comprehensive refurbishment of the Horchheim Tunnel near Koblenz on the Rhine, Rhomberg Sersa Rail Group was commissioned to renew the tunnel’s electrical power systems.
The contract included the installation of tunnel safety lighting, power supply systems at the south and north portals, power connections for the signal boxes, and electric shaft heaters.
A key element of the project was the safe drainage of mountain water (seepage water). This water is collected on both sides of the tracks via a longitudinal drainage system and directed towards the northern tunnel portal. For regular maintenance and inspection, drainage flushing shafts are located along the route. These shafts must remain filled with water to prevent the build-up of sediment or solids. This is ensured by a specially designed overflow mechanism. To prevent the water from freezing during winter, electric heaters had to be installed. RSRG, in collaboration with the supplier, developed bespoke heating solutions for this purpose.
Several challenges had to be addressed during implementation:
- Individual heating requirements per shaft: Due to the tunnel’s incline and varying distances of the shafts from the tunnel portal, water levels differ, requiring each shaft to have a specifically adjusted heating capacity.
- Comprehensive monitoring per shaft:
- Level monitoring: Prevents the heater from operating if the water level is too low, avoiding dry running.
- Temperature limiter: Switches the heater off if the maximum temperature is exceeded.
- Temperature controller: Regulates switching on and off of the heater to maintain optimal temperature.
Thanks to these customised solutions, the shafts can be reliably and efficiently heated, ensuring the functionality of the drainage systems even in winter.
Facts
Project Horchheimer Tunnel
- Location: Koblenz, Germany
- Scope: Installation of tunnel safety lighting, power supply at the south and north portals, power connections for signal boxes, electric shaft heaters
