for existing Belchen tunnel, A2 freeway
In preparation for the rehabilitation works to the Belchen tunnel, two new smoke extract tunnels, each 300 m long, were constructed by order of the Federal Roads Office, FEDRO, at the north and south portals. To increase safety, the intermediate slabs and control centers are monitored by up to 18 sensors, linked up via existing power lines and controlled by the Gruner-developed SensorServer software. The collected data are monitored via Internet and, in case of an emergency, the relevant staff will be alerted by SMS and e-mail.
Gruner AG has been responsible for ecological site supervision since 2013.