Special Solutions
There is an iconic glass tower at the Tiergarten railway station in Berlin, Germany. It is the ventilation outlet of the B96 Tiergarten Tunnel. The detailed design was developed in close collaboration of the architect and the tunnel ventilation designer. The structure has a triangular floor plan and consists of a steel framework with glass bricks.
During equipment installation in this tunnel, it was discovered that the exhaust air duct was significantly smaller than shown on the drawings. By optimising the large axial fans, it was still possible to achieve the required airflow rate.
During refurbishment of the A2 Arisdorf road tunnel, the first jet fan group was installed close to the entry portal. This was a consequence of the requirement that the false ceiling should remain intact for major parts of the tunnel. The fans at the portal are only operated into the tunnel.
The safety installations of the A22 Kaisermühlen Tunnel in Vienna, Austria, were replaced and improved to meet the current safety standards. It was not possible to install additional jet fans in the normal tunnel profile. The jet fans were installed on a support beam at the tunnel's entry portal. They are only operated for smoke control. In normal operation, they are not required and not used to protect the neighbourhood from additional noise.
(Photo: ASFINAG)
The 65m ventilation outlet of the Cross City Tunnel in Sydney, Australia, consists of a triangular steel construction. The shape is determined by the location of the structure, which is encompassed on all sides by elevated roads.