Cable Percussion
Ground Investigations Ireland Ltd have a total of 5 Dando 2000 Cable Percussion boring rigs which are used for Geotechnical and Environmental ground investigations.
Cable percussion boring is a tried and tested method of site investigation. The boring technique allows the installation of casing inside the borehole to prevent loose soils collapsing into the hole, allowing the borehole to be advanced to considerable depths while maintaining good progress and sample recovery.
‘Clean’ boring techniques can be utilised with the provision of different sized casing to prevent mixing or contamination in the upper strata’s from affecting deeper strata. This is especially important on sites with variation of the soils and high concentrations of mobile contaminants. Boreholes can be drilled at a variety of diameters including 150mm and 200mm
In-situ testing can be undertaken in the borehole including Standard Penetration Testing (SPT), borehole vane testing & permeability testing.
Disturbed samples are taken from the borehole by the drillers for logging by an experienced Engineering Geologist, Geotechnical Engineer or Environmental Engineer.
Undisturbed tube samples including Piston Samples and thin walled U100 can also be recovered for laboratory testing. On completion, gas and groundwater monitoring pipes and geotechnical monitoring equipment can be installed in the borehole to allow later measurements by an Engineer.
The rig is towed into position using a 4-wheel drive vehicle, meaning that these rigs can be used in most locations where there is sufficient space; a considerable working area and head room is required however. The rigs are fitted with lifting points enabling them to be moved into position by a crane on difficult sites or onto an overwater drilling platform.
Upon completion of cable percussive testing an experience Engineering Geologist or Geotechnical Engineer will prepare detailed geotechnical logs using AGS compatible software.
Ground Investigations Ireland can prepare soil test schedules on our Clients behalf and will undertake soil testing to determine the soil engineering characteristics required for the proposed design.
All fieldworks are carried out in accordance with Eurocode 7 Part 2 Ground Investigation and testing (ISEN 1997-2:2007) and BS 5930.