GPR SURVEYS
Ground-penetrating radar (GPR) is a geophysical method that uses radar pulses to image the subsurface.
The Ground Penetrating Radar uses electromagnetic radiation in the microwave band (UHF/VHF frequencies to detect reflected signals from subsurface structures. GPR can be used over a variety of surfaces When the ground conditions are right. Utility Surveyors can use GPR to detect subsurface objects, changes in material properties, and voids and cracks.
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We use the GPR to confirm services and to locate services which are not detectable by other geophysical techniques.
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Benchmark Surveys uses the latest in GPR technology, Multi-Channel GPR Array Systems that can now investigate underground utilities and ground investigations like sink holes more accurately than previously possible.
STREAM DP
Multi-channel GPR array
Introducing Stream DP, a multichannel ground penetrating radar array solution designed to detect underground assets with unmatched performance.
Stream DP uses Equalized Scrambled Technology (EsT) to provide unparalleled control of the GPR signal, extended depth range, and ultra-high resolution, setting a new standard in utility detection.
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Stream DP accurately reconstructs the underground utility network in 3D in a single scan. Its lightweight and compact design allows for efficient deployment by a single user, and the latest software technology solutions for data collection and post-processing make data analysis faster and smarter.
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This innovative technology offers an unachievable GPR performance until now, enabling successful location of buried objects without compromising between depth range and resolution.
POST PROCESSING GPR DATA.
MULTI-CHANNEL GPR ARRAY.
Here we are post processing our Ground Penetrating Radar (GPR) data obtained from our advanced Multi-Channel GPR Array system. By utilising this technology, we gain access to a wealth of information beyond what can be observed solely during site work.
With the introduction of the stream DP, we now have the capability to conduct more comprehensive investigations.
Take a look at the remarkable visuals showcasing the genuine dimensions of a foul pumping chamber concealed beneath the road surface. Our GPR data reveals the hidden depths of this crucial infrastructure.
DIGITALLY SURVEYED & MARKED ON SITE
All of our Utility Survey Findings are sprayed on-site with coloured spray paint to represent the different utility services.
Chalk can also be used if required.
The exact locations of the services are then recorded with our survey equipment, so the client has a permanent digital record with co-ordinates of the locations of those utilities.
We will then overlay the utility survey data onto a topographic survey if the client has also requested a topographic survey, or we can overlay the data onto a previous survey the client provides.
Full Utility Surveys to PAS 128 Standard
British Standards Institution (BSI) PAS 128 is the current specification for underground utility detection, verification and location. A collaboration between BSI and the Institution of Civil Engineers (ICE) resulted in the PAS 128 standard which requires accurate, quality information to be recorded to a consistent standard with regards to the location of underground utilities. This removes the element of uncertainty, interpretation and resultant variable risk when end users are referring to utility survey reports.
GPR Surveys
Ground-penetrating radar (GPR) is a geophysical method that uses radar pulses to image the subsurface. This nondestructive method uses electromagnetic radiation in the microwave band (UHF/VHF frequencies) of the radio spectrum, and detects the reflected signals from subsurface structures. GPR can have applications in a variety of media, including rock, soil, ice, fresh water, pavements and structures.
In combination with the Ground Penetrating Radar, we also use:
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CAT & Genny
A cable locator or cable avoidance tool (CAT) is an instrument used for detecting the presence and approximate location of buried services in advance of undertaking excavation works. It aims to avoid accidents while excavating.
Sondes Drainage
Used to locate buried plastic Water Pipes, Foul Pipes and any other non-magnetic utilities, Sondes are transmitter probes that are attached to the end of a Flexirod. The Sonde is pushed along the pipe, and the position of the sonde detected from above ground level. The entire path of the pipe can be located as long as there are no blockages, if any blockages are met we can mark where the blockage is.
Flexi Tracing
The Flexi Trace rod can be energised by a Radiodetection transmitter or Genny and inserted into pipes as small as 12mm. It is used with a Radiodetection locator or C.A.T to find and trace small diameter plastic pipes
Video Pipeline Inspection
Pipeline video inspections using a flexible rod with a fibre optic camera attached to the end to visually inspect the interiors of pipelines. A common application is to determine the condition of small diameter sewer lines and household connection pipes.
We also use other techniques when conducting utility surveys to ensure the best possible survey results: