Tunnels & Metros

A fire breaking out in a tunnel can have disastrous consequences, discover our smoke exhaust expertise

  • Over 20 years experience
  • Many references
  • Road and Railroad tunnel
  • Smoke exhaust solutions

Context and issue

Traffic can reach up to 200 000 vehicles a day in a road tunnel and the safety of users is a major issue. A fire taking place in a tunnel can have awful consequences and the smoke propagation speed can sometimes reach 4m/second.

The risks of a fire in a confined space are: Asphyxia, loss of visibility, explosion, collapse and the rise in temperature.

Rise in temperature and radiation

In case of a light or heavy vehicle catching on fire, the heat emitted is extremely dangerous for men and safety distances must be observed to ensure the user’s survival.

Propagation of smoke

Smokes swiftly spear throughout the tunnel causing a loss of visibility and asphyxia.

Smoke exhaust processes

Depending on the tunnel’s typology different solutions are set up.

Longitudinal ventilation

It is designed to push the smokes towards the entrance of the tunnel by the mean of axial fans. There also exists variants of that strategy, using massive extraction dampers.

Transversal ventilation

In the event of fire, it is designed to renew the tunnel’s air by extracting the smoke through the ceiling and blowing fresh air through the bottom.

Equipments requirements

The many elements composing the ventilation system are subject to security standards testing their heat resistance.

Acoustic constraints

Context and problematic

Acoustic in tunnels must be taken care of in regards to both users and neighbors.

Road and railway tunnels

Road and railway tunnels are not always subject to acoustic measures. Silencers and acoustic walls can be applied in some situations.

Subway tunnel

Subway tunnels are located in urban areas and receive public. Acoustic measures inside are set by the Engineering office and the neighbor’s noise regulation.

Material characteristics

Extensive studies must be led in order to set up the optimum solution so as to reach the acoustic objective.

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