Test tunnel

Test tunnel

Facilities

This is a concrete tunnel, partially buried, with similar dimensions to a two-lane road tunnel. It includes two ventilation stations, a service and emergency shaft below (see Figure) as well as three emergency exits.

Key features

Its key features are as follows:

  • Length: 600 m
  • Width at the base: 9.50 m
  • Maximum height: 8.12 m
  • Cross section (without false ceiling): 66 m2
  • Cross section (with false ceiling): 44 m2
  • Minimum radius of curvature: 400 m
  • Longitudinal slope: 1 %
  • Transverse slope: 2 %
  • Emergency tunnel: 4 m wide by 2.50 m de high
  • Emergency exits: 3 (every 150 m)

Ventilation systems

The tunnel is equipped with maximum flexibility in terms of ventilation, so that the different ventilation systems which are most common in modern tunnels can be tested:

The ventilation systems and equipment available are as follows:

  • Longitudinal ventilation
  • Semi-transverse ventilation
  • Mixed longitudinal / semi-transverse systems
  • The “Saccardo” system

Longitudinal ventilation

Fourteen 45 KW jet fans (6 fans are installed in the tunnel)

Semi-transverse ventilation

  • Two 355 KW axial fans, reversible and with variable speed, with a combined capacity of 160 m3/s
  • Removable false ceiling, located 5.17 m above the tunnel floor
  • Twenty-one motorised 2 m2 ventilation hatches

Saccardo ventilation

  • Two axial fans, 355 KW (supply) and 315 KW (extraction), with a combined flow of 120 m3 /s

Passive protection system against fire

The tunnel is equipped with a passive protection system against fire, comprised of a 5cm layer of flame-retardant concrete (Meyco Fireshield from the BASF chemical company). This protection has the following key features:

  • Located in the central zone of the testing tunnel between point 335 and point 415.
  • Allows fires with high heat output to be conducted; fires with a heat output of over 200 MW have already been conducted.

Equipment

The tunnel also includes the following additional equipment:

  • Water storage tanks with a total capacity of 600 m3.
  • Pressure pipes with a diameter of 150 mm on the outside of the tunnel, located at point 300. Supplied by a pressure generator which works to a maximum pressure of 4 bars and with a capacity of 180 m3/h.
  • Pressure pipes with a diameter of 100 mm on the inside of the tunnel, with fire hydrants every 50 metres. This system receives water from different tanks and is supplied by a 9.5 bar pressure generator with a capacity of 72 m3/h.
  • Spillage collection system with a 50 mdecanting basin.
  • 250 W lights every 15 m, on both side walls.

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