Digital data for track layout
Maximum precision was a must during milling, as cold milling machines have a considerable influence on the quality of road rehabilitation works. This is especially true for race tracks, as the demands to be met during rehabilitation by far exceed those of normal road paving jobs. It was necessary to mill off the existing asphalt pavement to a depth of 8cm. The call for tender specified 3D levelling for the reprofiling of several bends. The milling service provider used the digital terrain model previously created by the client to feed the processed data for levelling into the cold milling machines via an interface. “This means that it’s no longer necessary to scan references on the ground. Instead, the machines receive their milling depth information via a total station that is set up next to the pavement surface which is to be milled. It automatically follows the cold milling machine with a range of up to 100m,” explains Gerald Kluge, university-qualified engineer and Head of Milling Division at SAT. To ensure that the machine receives a continuous reference signal during 3D milling, the total station must be relocated roughly every 100m and recalibrated at the new position. Two total stations were used at the Sachsenring race track, each alternately serving as a signal transmitter for the milling machine.