To complement our fleet of Pioneer rigs Geotechnical Engineering have developed a specialist, low headroom machine for those difficult to access borehole locations.
Still maintaining the Pioneer’s impressive drilling capabilities, the low headroom machine sits a mere 2.5m high while in standard drilling position and can be reduced to work in a minimum height of 2.1m without its winch. It can therefore access spaces that most rotary rigs would be unable to enter and operate. It is a compact self-contained track mounted dynamic sampling and coring system, designed to retrieve high quality soil and rock samples for geotechnical and geo-environmental investigations.
The rig is mobilised to site safely and securely on a tachographed flat-bed vehicle owned and managed by Geotechnical Engineering Ltd. The ancillary kit and materials are transported within the support vehicle and the operation is supported by an experienced and trained two man crew, often accompanied by one of our engineering geologists.
For narrow access the tracks can be retracted to a 0.9m tracking width, allowing access to extremely restricted locations.
For safety the rig is operated by a diesel engine and fitted with both a Chalwyn valve and spark arrestor. Ventilation equipment is provided to remove harmful exhaust fumes to disperse at a safe location.
For areas of hardstanding we can provide surface coring ability in both concrete and tarmacadam prior to carrying out service clearance in accordance with HSG47.
Soft soils are investigated using dynamic sampling up to 20m deep to obtain continuous samples of up to 112 diameter retained in a semi-rigid plastic liner providing a continuous soil profile for ground modelling and sampling. Discrete strata can be identified for contamination sampling purposes. Rotary core drilling up to 112mm diameter can be carried out up to 50m deep to obtain continuous rock cores of up to 112mm diameter, again retained in a semi-rigid plastic liner.
In areas where there is headroom to enable the winch to be used, in-situ testing in the form of calibrated SPTs in general accordance with BS EN ISO 22476-3 can be carried out. Undisturbed UT100, U100 and U70 samples can be taken in cohesive soils.
Borehole instrumentation can be installed including 19mm and 50mm standpipes and pneumatic, hydraulic or vibrating wire piezometers for groundwater or gas monitoring and inclinometer tubing to monitor movement.