Abstract:
The technical challenges for accurate drilling positions increase with deep underground structures in inner
city areas. Designed for jet grouting, a specific solution has been developed to record the alignment of rods
during drilling by integrating microchips into the drilling rods. By feeding the rod with constant electric
current, microchips, integrated in special couplings, can be read during the drilling process and tracked on
monitors installed in the operator’s cockpit. The orientation for the drilling rod is provided by magnetic
points and a compass, positioned above ground on the drilling rig. In combination with asymmetric drilling
bits, it is now possible to steer the drilling hole to predetermined positions to compensate for deviations in
deep bores. This type of drilling rod for jet grouting has been used in Berlin since summer 2019.