Raiseboring Romania

The raise bore technique was used for the extension of the Herculane and Cornereva shafts for the hydro powerplant.


In order to extend the ventilation shafts at a later date, pilot holes were drilled for extraction discharge using the raise bore technique. The extension boreholes were specified at 1420 mm diameter, whereby a high accuracy of 0.5 % was required. Depths of 73.0 m and 45.2 m were commissioned with pilot bores each of 8 ½".

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Dipl.-Ing. Thomas Ahlbrecht
Tel.: +49 231 2891 248
Fax: +49 231 2891 492

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