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Major tunnel construction project in the heart of Lausanne.

Within the IGCS consortium, cablex assumes responsibility for the overall project management in the area of electrical installations and leads the implementation of the railway engineering work package in the tunnel construction project for the Lausanne-Echallens-Bercher (LEB) railway line.

03.08.2021
Author Carolin Rabea Primerova

Major tunnel construction project in the heart of Lausanne.

Thanks to tunnel projects such as the Ceneri Base Tunnel, the Bözberg, CEVA or maintenance work in the Gotthard Tunnel, cablex can provide some excellent references. cablex has taken on management of the overall project with Philippe Wuillemin, and is also responsible for the railway engineering in the LEB tunnel construction project.

 

For a safer traffic infrastructure.

The congestion on Avenue d'Echallens in Lausanne caused by the numerous road users has repeatedly led to accidents. Pedestrians, car drivers, cyclists, buses and trains were all moving at the same time, creating a confusing and dangerous situation.

In order to make the transport infrastructure safer and more comfortable, the railway between the Union-Prilly and Lausanne-Chauderon stations is to run underground in future. For this purpose, a 1.7-kilometre long tunnel has been under construction since summer 2017. This runs double-track in a eight metre wide and 15 to 30 metre deep subway under the Avenue d'Echallens. The tunnel is expected to be put into operation in spring 2022. 

Thanks to tunnel projects such as the Ceneri Base Tunnel, the Bözberg, CEVA or maintenance work in the Gotthard Tunnel, cablex can provide some excellent references. cablex has taken on management of the overall project with Philippe Wuillemin, and is also responsible for the railway engineering in the LEB tunnel construction project.

The following work will be performed by cablex in connection with the LEB project:

  • Electrical distribution from different entry points in the tunnel and engineering spaces
  • Installation of all low-voltage devices: lighting with KNX control system, service sockets, emergency lighting, inverters for emergency grid.
  • Installation of low-intensity current for key safety components: fire detection, access control (door monitoring and infrared light curtain), video surveillance, valve control for fire management, Genephone communication systems for firefighters.
  • Installation of cable troughs for distribution along the length of the tunnel, feeding of cables into a battery of tubes on platforms on each side of the route with feed-through chamber every 50m.
  • Earthing/equipotential bonding with isolation of various earthing systems using an isolation transformer (rail earth and construction work earth)
  • Handrail along the length of the tunnel on both sides (2×1.6 kilometres)
  • Installation of lighting in the tunnel (service lighting) and emergency lighting beneath the handrail
  • Wiring of fibre optics for communication and for tunnel control (installation of racks in the engineering spaces)
  • Installation of electrical equipment in the emergency recesses (control panel for maintenance work, communication intercom)
  • Installation of signage for escape routes and emergency exits in the tunnel
  • Performance documentation (more than 150 technical reports) 

cablex will also perform the following installations on behalf of Siemens:

  • Installation of five ventilators on the tunnel ceiling (500 kilograms per unit)
  • Installation of compressor fan in the emergency exits
  • Wiring of three Axiaux fans (250 kW) for smoke extraction in the tunnel
  • Wiring for ventilation control between engineering spaces and firefighter access points
  • Wiring of centralised technical management with control station at Echallens 
  • Support with construction management and coordination 

cablex will also perform the following installations for the GCF company:

  • Installation of power cables in the tunnel from the train traction cable (1500VDC)
  • Installation of cables in the tunnel between two substations of the traction cable (1500VDC)
  • Installation of rail earth cables in the tunnel bench
  • Various equipotential bonding connections between the devices on the traction cable.

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