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GPR survey is fully NDT, cost efficient way to identify sub-surface objects and features.
Ground Penetrating Radar survey (also called GPR survey, GPR imaging, GPR mapping or GPR scanning) is used to scan and map underground obstructions
and objects for construction, geophysical, archaeological and regeneration
projects.
GPR survey identifies underground objects by sending non-intrusive radar signals into the ground. Once the signal is received back an image or a map of the entire subsurface area is produced. GPR imaging is a stand alone service which can be coupled with other techniques for increasing accuracy of the results. Since Ground Penetrating Radar (GPR) can detect metallic as well as non-metallic objects, pipes etc. therefor it is frequently used with electromagnetic location (EML) technique which can only detect metallic buried services.
Being fully NDT method, GPR survey increases the safety of your site whilst also reducing the costs associated with your project. GPR survey is efficient and reliable mean of scoping your grounds.
GPR survey types in our offer
What is a GPR survey?
GPR survey (Ground Penetrating Radar survey) is a fully non-destructive (NDT) and highly cost-efficient method for identifying sub-surface objects and features. Leveraging advanced GPR survey technology, this technique ensures accurate results while maintaining minimal impact on the surveyed area.
What does a GPR survey involve?
GPR survey benefits include:
Non-invasive detection of buried utilities, voids, and structures.
Efficient mapping of underground features using GPR radargram and GPR depth slices for detailed visualization.
Quick and reliable data collection, even in complex environments.
Cost-effectiveness compared to traditional excavation methods.
GPR survey methods
Various GPR survey methods are available depending on the application. Common gpr applications include utility mapping, archaeological investigations, and environmental studies. Each GPR survey carried out is tailored to specific project requirements, ensuring optimal results.
GPR survey data and mapping
The process involves comprehensive GPR survey data collection, followed by analysis to create accurate GPR survey mapping of sub-surface structures. This data provides essential insights, enabling efficient decision-making and reducing project risks.
Applications of GPR survey
Key gpr applications encompass:
Locating buried pipelines and cables.
Identifying structural weaknesses and voids.
Archaeological site analysis without disrupting artifacts.
Environmental studies to detect contamination or groundwater.
GPR survey preparation and execution
Proper GPR survey preparation is critical to achieving high-quality outcomes. Factors like site conditions, soil type, and project goals are considered to optimize GPR survey operations. This ensures that each gpr survey carried out delivers accurate and actionable insights.
Limitations of GPR Survey
While GPR survey limitations exist, such as reduced effectiveness in clay-rich soils, advances in GPR survey technology continue to enhance its applicability. Understanding these limitations helps ensure realistic expectations for GPR survey results.
Request a GPR survey quote
For projects requiring precision and efficiency, contact us to discuss your needs and request a customized GPR survey quote. Our expert team will guide you through the process, ensuring the best solution for your sub-surface investigation.
Explore the full potential of GPR survey investigations and experience the benefits of cutting-edge, non-destructive technology for your next project.
What can GPR Surveys detect?
A GPR survey (Ground Penetrating Radar survey) is an incredibly versatile and effective tool for detecting a wide range of sub-surface features and objects. Depending on the project’s requirements, a GPR survey can be commissioned to detect a variety of underground structures and anomalies, including:
Utilities: GPR survey for detecting utilities will provide precise information about the location of buried pipes, cables, and other utility services.
Rebar and concrete structures: A rebar GPR survey is typically used for scanning concrete slabs or columns. This survey not only locates the reinforcement but also reveals details such as the diameter of the rebar, depth of concrete cover, potential voids under the rebar, and the slab thickness.
Voids and subsurface anomalies: GPR surveys are ideal for detecting voids, subsidence, and buried obstructions. GPR survey data can identify air pockets, hollows, or weaknesses in the ground, which is critical for ensuring the integrity of the structure or land above.
Archaeological sites: GPR surveys are non-invasive and perfect for exploring archaeological sites. They allow for the detection of ancient structures, unmarked graves, or other historical remains without disturbing the soil or objects.
Geological layers: GPR survey investigations are invaluable for geological surveys, allowing the detection of geological layers underground.
Tree roots and wildlife tunnels: A GPR survey can also detect tree roots that may affect the integrity of structures or underground utilities, as well as the presence of badger tunnels or other wildlife burrows.
Canal locks and other unusual requests: Occasionally, GPR surveys are requested for more specialized applications, such as GPR survey of canal locks to detect voids.
How much does a GPR survey cost?
The price of a GPR survey will depend on the site work, the amount of office interpretation and whether a report is needed.
Send us an email or use either a contact form or ‘Get a quote’ form on our website and provide all the necessary information for producing an estimate. Such information would be what GPR survey you require, details about the site location and site condition, the schedule of your project, any other relevant info that you believe should be taken into consideration.
Our team will than asses all information you provided and will get back to you with a GPR survey estimate. The more information you will give us the easier it would be for our team to produce the most accurate quote.
On occasion it might be necessary for us to visit the site before offering you an estimate or it can be requested by a customer. Visiting site before providing a quote is free of charge if within reasonable distance. Long distance travel or travelling abroad to provide an estimate will incur a fee.
Why is a GPR survey useful?
The biggest advantage of GPR imaging is its non-destructive character (in short, NDT) which means that the scanned surface is not being damaged during scanning with GPR. We also use temporary paint on site so once those wash away there will be no visible markings left.
Being able to see underneath the surface without breaking the ground is not only practical but will save you money for (likely) already expensive project. GPR survey is cheaper than core drilling service. Also, by commissioning GPR survey you will avoid costs associated with fixing broken ground, even more expensive- those caused by disruption and the delays to your site schedule or in the worst-case scenario, cost of repairs for structural damage to the building if eg. the post-tension cable is damaged during drilling.
Ground Penetrating Radar (GPR) survey has been used commercially since 1970s and up to this day it is reliable and popular method of obtaining information about sub-surface environment.
How GPR survey is performed?
GPR survey consists of two parts: on site data collection and post office processing and data interpretation.
The first stage of the GPR survey is on site data collection. The surveyors will arrive to site and in first instance review of the area to understand the most appropriate method for surveying and referencing.
Once the equipment is assembled and calibrated the GPR surveyors will start scanning the site. All reasonable efforts will be made to scan the area within the survey boundary using GPS for georeferencing the path of the radar or by plotting an orthogonal grid. Necessary notes will be taken on site by the surveyors to facilitate inputting collected data into the GPR software in the office. Once the data is collected and saved for the office-based processing and interpretation the equipment will be disassembled and the surveyors will leave the site.
The second stage of GPR survey is office-based processing and interpretation. The data is typically processed by the same surveyor who was collecting it on site but on occasion in might be another geophysicist. Once the data is correctly inputted into the processing software and necessary filters applied the experienced geophysicist will interpret it based on their expertise and experience.
The results of the interpretation will then be cleaned in the AutoCAD software to produce an easy-to-read drawing for a customer.
What are main benefits of GPR survey?
Why should you choose us for your project?
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Our senior surveyors have over 20 years of experience of working with GPR |
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We are trusted sub-contractor for many large British surveying companies |
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We have long experience of coopering with universities |
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As a small team of experts, we put emphasis on customer relationship |
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FAQ
Will GPR scanning equipment compromise safety on my site?
GPR survey equipment emits an electromagnetic pulse into the ground and records the reflected signals from subsurface structures and voids. It is entirely non-destructive and will not break the ground’s surface or affect any objects below. What’s more, it doesn’t emit any harmful levels of radiation, nor are there any other by-products created throughout the process. This means it’s entirely safe to use by its operators, and on sites of any type, including those open to the public.
Is GPR survey equipment difficult to use?
The equipment itself is not difficult to use, but the interpretation of the data recorded tends to be complicated. The results of a GPR survey aren’t automatically translated into an easy-to-understand picture of what lies below the surface; instead, it’s a series of lines and waves and it can take both training and years of practice to master the art of correctly reading the output. Often, it is the experience of the equipment’s operator that plays the most significant role in the accuracy of the results GPR can achieve.
Is a GPR survey 100% accurate?
While GPR is one of the most effective methods of non-destructive testing available, it can never be 100% accurate. One factor that can adversely affect the accuracy levels include the type of soil being surveyed. Clay soils and soils that contain high levels of salt or minerals can obstruct the GPR reading. Another factor is the experience of the equipment’s operator: interpreting the data collected can be complex, which is why it’s beneficial to commission surveys from an expert firm.
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