The Qinling Zhongnanshan Highway Tunnel, also known as the Qinling Zhongnanshan Tunnel and the Zhongnanshan Tunnel, is the world's first longest double-tunnel highway tunnel, the first longest highway tunnel in China and Asia, and the second longest highway tunnel in the world. Located on the northern section of the Xikang Expressway from Baotou to the Beihai section of the National Highway of China on Shaanxi, crossing the Qinling Mountains, it is an important part of the Xi'an-Ankang Expressway of Shaanxi's "three vertical, four horizontal and five radiation" highway network.
The Qinling Zhongnanshan Highway Tunnel has a single hole of 18.02 kilometers in length and a double hole of 36.04 kilometers in total. It can be crossed in 15 minutes, reducing Xi'an to Huangshui from 3 hours to 40 minutes.
The tunnel operation ventilation is provided with three vertical shafts with sectioned vertical ventilation. Among them, the tunnel air supply project selects Flaktwoods axial flow fans, which are large-scale adjustable axial flow fans produced by our company.
According to the special circumstances of the Qinling Zhongnanshan Highway Tunnel, according to the relevant requirements of the tunnel exhaust system in terms of flow, wind pressure, and wind speed, the company selected the corresponding models of large-scale axial fans and jet fans with adjustable blades. The parameters such as the angle of the blades and the volume of air at the inlet and outlet make the function of the fan the best configuration, on the one hand, it meets the ventilation of traffic operations, and on the other hand, it also meets the ventilation needs in the event of a fire.