EN 
DE On the site of the "Bochum Observatory", there are three so-called "Tagesüberhauen", mining relics of a former mining field. In mining terminology, a mine workings constructed in the coal seam from the bottom up to the surface for the purpose of ventilation is referred to as an opencast mine.
The three openings are to be explored by drilling to a depth of around 20 metres, taking into account the thickness of the overburden. Boreholes that open up the openings, cavities and loose zones must then be developed for backfilling.
In view of the potential risks to the stability and usability of the nearby and nationally recognised "Bochum Observatory", TABERG Ingenieure GmbH was commissioned to carry out the on-site construction supervision of the drilling work as well as the metrological monitoring of vibrations in the buildings of the "Bochum Observatory". The vibration monitoring is intended to detect and prevent adverse effects of the drilling work on the building structure and on the "centrepiece" of the observatory, the central parabolic antenna.
In addition to the reference values specified in DIN 4150-3 "Vibrations in buildings - Part 3: Effects on structures", "nano-lines" and "Vibration Criteria" (VDI 2038, Sheet 2) were used to assess the serviceability of the highly sensitive parabolic antenna.
