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Windowless sampling boreholes

Post 17114 of 23788

Geoinvestigate provide a wide variety of Borehole Drilling services. These range from small diameter hand augers typically limited to depths < 3m; Hand held percussive window sampling where a tube is driven into the ground up to 6m using a petrol, electric or hydraulic jack hammer and extracted using simple jacks or a hydraulic ram; probing or dynamic penetration testing whereby a small diameter drill string and a solid cone tip is driven into the ground up to 15m by a standard drop weight raised by chain on a small portable wheeled rig with mast.

Window sampling is a technique whereby samples of clay and sand can be recovered from small diameter Boreholes using portable hand held electric, petrol or hydraulic jack hammers or tracked min drills such as the Dando Terrier 2000 or Carl Hamm’s MRZB.

The equipment is small hands portable or in the case of the tracked mini rigs maneuverable making the technique particularly useful in limited, restricted or difficult access sites for example in back gardens, building and basements.

Typically Boreholes are of smaller diameter between 40mm to 100mm and do not extend below 6m depth. Window sampling is a fast and cost effective way of establishing the nature of the ground profile and identifying the presence of contamination. The samples are recovered in tubes with or without windows cut in them from which samples are taken. Windowless tubes are recent and more sophisticated advance having plastic liners which are slid out to reveal the soil sample.

Geoinvestigate operates and hires out several Dando Terrier sampling and geotechnical rigs. In accordance with the manufacturer guidance Geoinvestigate’s rigs are always manned by 2 of its well-trained operators. Though you may pay a bit more – the increase in production in metres per day and the peace of mind that comes from knowing the equipment is being  safely used is worth it.

With 2 operators the rig is capable of completing up to 8 Boreholes to 5 meters a day.

Typically the rig is hired out at £650 per day with 2 operators subject to location and travelling distance excl. VAT. Geoinvestigate can provide a basic drilling and sampling service or with full logging and site attendance by an engineering geologist.

The Dando Terrier sampling and geotechnical rig has been designed specifically for sampling and testing for geotechnical and environmental analysis. Crawler-mounted for easy site access in the most arduous conditions. Simple to operate and maintain, extremely reliable and competitively priced

Compact manoeuvrable crawler-mounted design ideally suited for long wheel-base transit type vans for fast mobilisation to site and secure storage of all equipment.

2-Piece drop hammer for sampling and testing incorporated in mast assembly with hydraulic cylinder giving 7000 kgs pull-back for recovery of casing and sampling tools. The mast assembly can be detached for remote operation in restricted access locations. Hydraulic tilting undercarriage allows operation on inclined slopes up to 30 degrees from horizontal. Deck area with storage capacity for all required drilling tools.

The Concrete coring head is useful when concrete and tarmac overlie the area to be sampled. Range of windowless sample tubes with plastic liners ensuring high quality samples, good presentation and ease of handling and transportation.