January 2015. Gas detection and air control in railway tunnel
Extension works for the tunnel in the Vigo-Das Maceiras section up to the Urzáiz station in Vigo, have been authorized by the government. The works included in the present contract are carried out because of the necessity of extending the tunnel up to the station.
The projected tunnels, a continuation of existing ones, are composed of two independent tubes with 30 meters separation between the axes, except at their arrival at the Vigo-Urzáiz station, where they converge. Their section is circular, with a free interior diameter of 8.50 meters. The tubes will be interconnected through connection galleries with a length of 21 meters and an excavation section of 26.5 square meters.
These tunnels are protected by CO and NO2 detectors designed and manufactured by DURAN ELECTRONICA, as well as by opacimeters distributed by DURAN ELECTRONICA.