Koning Willem-Alexandertunnel Maastricht
The 2.3km long Koning Willem-Alexandertunnel is the first double-layer tunnel in Europe, which is suitable for both passenger cars and trucks. The tunnel will be opened to the public on December 15, 2016 and will become a gateway between the Netherlands and the rest of Europe.
The tunnel is part of a comprehensive and sustainable plan for the city and the motorway. The “Green Carpet” addresses multiple objectives to improve the flow of traffic on the A2 motorway and the accessibility of the city of Maastricht. In addition, the plan promotes the quality of life and road safety, resolving bottlenecks within the city, and creating opportunities for urban development.
On the tunnel project, NOVENCO Building & Industry (NBI) was awarded the contract for both the tunnel ventilation system as well as the pressurization systems for the escape tunnels, including associated engineering, supply, installation, commissioning, factory acceptance testing (FAT), site acceptance testing (SAT) and the handover.
For the four tunnels NBI has supplied a total of 62 tunnel jet fans for the ventilation system and smoke control system in case of a fire in the tunnel. All fans are made of high grade (AISI 3.16) stainless steel. Furthermore, all jet fans are certified as smoke exhaust fans in the class F300 in accordance with European standard EN 12101 (tested at 300°C for at least 2 hours).
At the tunnel entrances a total of 23 tunnel jet fans type AUR-1120 are installed. These jet fans have an impeller diameter of 1,12m and are driven by 30kW electric motors. To ensure that the sound inside the tunnel is acceptable, the fans are fitted with 2xD long silencers on both ends (≅ 2.3m per silencer).
Furthermore, the silencer on the suction side of the fans are coated in a color that matches building structure. All entrance tunnel jet fans are equipped with a special inlet cone, which is designed in association with with Rijkswaterstaat (the Dutch road and water authorities) to counteract negative influences of side and fall winds.
Inside the tunnel tubes a total of 39 fully reversible jet fans type ARR 800 are installed. These jet fans have an impeller diameter of 0.8m and are driven by 18.5kW electric motors. On both sides of these jet fans 3xD long silencers are installed (≅ 2.4m per silencer).
NBI also delivered and installed the transition cabinets (power and control of the tunnel fans) in the technical part of the center, including the cabling from these cabinets to the tunnel jet fans.
There are two escape corridors in the center tunnel in case of a fire in one of the tunnel tubes. For these escape corridors, NBI installed pressurization systems. With a pressurization system, the escape corridors are are protected against the ingress of smoke and toxic gases in the event of a fire or other emergency in one of the tunnel tubes.
For these pressurization system, a total of four large axial fans type ACN-1120 are installed, including all necessary accessories such as silencers, ductwork, dampers, outside air intake grilles, control panels, smoke detectors, temperature transmitters and internal wiring from the control panels to the supplied components.
More information on the A2 Maastricht: