What is Window Sampling?
Window 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 temporary casing. Once the sample has been extracted, it is then logged by a trained and qualified engineer.
The sample tubes used on this rig are 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 ground conditions.
The benefits of Window Sampling
Window Sampling has many benefits over other types of drilling. This technique offers a quick assessment of soft soil conditions. Our rig is designed to be 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.
Our Window sampling rig can also be tracked up slopes, driven through standard domestic doorways, and, in areas where head-room or access are limited.
This method also allows for the easy installation of Gas and Groundwater monitoring pipes.
Standard Penetration Tests (SPT)
SPT’s can be conducted on this rig. This in-situ dynamic penetration test is designed to provide advanced technical information about density soil at various depths.