A Cable Percussion drilling rig (otherwise known as Shell and Auger drilling rig) is a mobile tripod rig towed by a 4×4 wheeled drive vehicle.
Casing allows stability to be maintained within a borehole where loose and water bearing granular soils are present. 150mm (6inch) or 200mm (8inch) diameter casing are generally used, with other larger diameters available upon request.
The ground bearing capacity can be determined within the Cable Percussive Boreholes from Standard Penetrations Tests (SPTs), Cone Penetration Tests (CPTs) and undisturbed U100 samples. In addition, disturbed bulk and jar samples of each stratum will be taken for Geotechnical and Contamination Testing, and for our Engineers to log in accordance with BS 5930, BS EN ISO 14688-1 and BS EN ISO 14689-1.
On completion, the boreholes are backfilled and reinstated, or standpipes can be installed for Gas Monitoring and/or Groundwater Monitoring.