The Brenner Base Tunnel - a new link through the Alps

18 The construction of a long railway tunnel requires all structural elements to be of the highest precision. Reliable and precise measurement methods guarantee the accuracy needed for success. First of all, a geodetic reference frame was created to facilitate the survey work necessary for the construction of the Brenner Base Tunnel. This creates a link between the plans and the topography and serves as a starting point for the underground tunnel construction. Using satellite measurement technology, 28 base points were established to form the geodetic reference frame. To accomplish this, the project area was measured twice, lasting 24 hours using GPS. The achieved degree of accuracy is seven millimetres. Tunnel surveying - meeting point at Brenner 28 points defined using satellite measurement technology form the basis for further measurement of the tunnel. This is performed using the principle of the interlaced polygon course, whereby progressive angles and distances up into the tunnel are determined. emergency stop Trens GPS satellite access tunnel Mules portal Fortezza portal network polygon course