VORRICHTUNG ZUR HERSTELLUNG VON BOHRLOECHERN MIT HINTERSCHNEIDUNG

摘要

2.1 In high-strength, in particular reinforced, concrete parts, the drill holes are produced with a diamond drilling tool which has an axial through-bore for the cooling and flushing liquid. After the cylindrical drill hole is produced, an undercut is reamed at the depth of the drill hole using a separate reaming device. …2.2 So that drill holes with an undercut can be produced in one operation with the same diamond drilling tool, the shank of the drilling tool is provided with a stop collar and a widening in cross-section which narrows towards the drill head and the stop collar and on the outer surface of which longitudinal flutes are arranged. ……