The deviation of drill holes from their theoretical position can lead to failures or dangerous situations due to the risk of fly-rocks when blasting rock. The origin of these deviations may be due to several causes: poor positioning of the drilling machine, deviations of the drill string due to unfavourable geological conditions, wear of drilling tools, etc.A novel equipment has been developed to evaluate boreholes efficiently and safely, being able to validate them and find and quantify potential deviations from the projected trajectory. The system consists of a probe that is introduced into the borehole to determine the heading (dip direction angle) and inclination (dip angle) of the borehole, comparing the real trajectory of the borehole with the projected one.
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