Cable Percussive Boreholes
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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.
Window Sampling Boreholes
Window sampling or windowless sampling is a technique used to bore through shallow soft soils to investigate the substrata in order to gain a profile of the ground conditions and to facilitate soil sampling for chemical and geotechnical analysis.
Rotary Boreholes
Rotary Open Hole techniques are employed to investigate the presence of shallow (<30m) coal using a water flush system to prevent the ignition of potentially explosive mine gases for deep observations of coal bearing strata.
Trial Pitting
A trial pit (a.k.a. test pit) is a ground investigation technique that is used as a means of investigating, in large scale, the condition of the ground and the type of strata present at shallow depth, typically before beginning construction works. They are useful for obtaining large volume bulk samples of the ground.
Gas Monitoring & Assessment
Kiwa can provide a standalone Ground Gas Monitoring service, or as part of a more detailed Phase 2 Intrusive investigation where assessment is made to BS8485 (Code of practice for the design of protective measures for methane and carbon dioxide ground gases for new buildings).
Waste and Contamination
Kiwa CMT | Construction materials, geotechnical, structures and waste testing.
Site Investigation
Kiwa CMT | We provide a range of ground investigation services
