Danbar Drilling Services Ltd is a leading, independent drilling contractor, specialising in Land Drilling. With over 35 years of experience behind us, we offer a wide range of specialist drilling services to large, small, private, and commercial clients, including Cable Percussive Drilling, Geotechnical and Environmental Drilling, Geothermal Drilling, Water Well Drilling, and Windowless Sampling.
What is Windowless Sampling?
Windowless Sampling is a specialist sampling technique that involves a narrow steel tube with a plastic liner, being driven into the ground in order to retrieve a sample. Thanks to the plastic liner, the sample can be kept intact during the removals process, allowing for accurate results from the full depth of the samples.
During this sampling process, cylindrical steel tubes are drilled into the ground using a high performance hydraulic hammer, and the soil is then pushed into the tube for examination. In order to prevent the bore hole from collapsing in on itself, if the ground is unstable, the hole is then lined with a steel tube. Once the sample has been extracted, it is then logged by a trained and qualified engineer.
The sample tubes used in Windowless Sampling are usually 1m long and are available in various diameters. The technique can be used to extract samples at depths of up to 10 metres, depending on factors such as soil type.
The benefits of Windowless Sampling
Windowless Sampling offers a whole host of benefits over other types of sampling. Firstly, the technique offers a rapid assessment of soft soil conditions. Secondly, because the machinery used to complete Windowless Sampling is relatively small and compact, it can easily be transported, making it ideal for sites with limited access and operating room.
During the process, the drilling rigs are mounted onto rubber tracks, meaning that disturbance is minimal. This makes Window Sampling suitable for use on environmentally sensitive sites with restricted access, areas that are close up against walls or inside buildings, and those where it would typically be difficult to obtain samples.
What’s more, Windowless Sampling rigs can also be tracked up slopes, driven through standard domestic doorways, and, in areas where head-room or access are limited, hand held equipment can also be used.
This method of sampling also minimises the potential for the cross-contamination of the soil samples during the drilling process.
However, it should be noted that this method of sampling is not designed for sampling or coring in hard rocks.
Standard Penetration Tests (SPT)
Our highly skilled and experienced team are perfectly equipped to complete Standard Penetration Tests. These in-situ dynamic penetration tests are designed to provide advanced technical information about the properties of the soil between a site.
During an SPT test, the sample tube can be driven into the ground up to 150 meters below the surface, allowing us to check the density of granular deposits. This method also allows for the easy installation of Gas and Groundwater monitoring pipes.
Windowless Sampling technique drives a narrow steel tube with a plastic liner driven into the ground to allow retrieval of a sample. The liner allows the sample to be removed and kept in tact, therefore giving accurate results for the full depth of the sample.
Windowless Sampling offers a more rapid assessment of soft soil ground conditions, the machine is relatively small and can be mobilised in the back of a large van, so it is ideal for sites with tight access and limited operating room.
Sample tubes vary in diameter and using this technique can be taken at depths of up to 10metres, depending on soil type.
by striking the cylindrical steel tube into the ground the soil is then pushed into the tube for later examination. The bore hole is then lined with a steel tube to stop the hole from collapsing in on its self.
The samples are then logged by a suitably qualified engineer.
Standard Penetration Tests (SPT)
Our standard penetration or SPT test, is an in-situ dynamic penetration test designed to provide technical information about the properties of the soil beneath a site.
The sample tube can be driven into the ground up to 150 meters checking for the density of granular deposits.
Allowing easy installation of Gas and Groundwater monitoring pipes.
No matter the service you’re looking for Danbar Drilling Contractors can accommodate your needs.
- Ground Investigation
- Rotary Drilling
- Window Sampling
- STP Testing
Get in touch
At Danbar Drilling Services Ltd, we are committed to providing a consistently high standard of service. As a family run business, we put our customers’ needs first, ensuring that we always deliver a first class standard of customer service from the very first moment you get in touch, right the way through to after care.
If you require any further information about our Windowless Sampling services, to discuss your project further, or for a quote, please get in touch. Our highly skilled and experienced team is ready and waiting to provide any assistance you might need.