GEOPHYSICAL
ENGINEERING

Concrete Reinforcement Mapping (Rebar)

Concrete reinforcement (rebar) is located in both ground slabs and within the walls of many buildings. When remedial work is to be carried out on these structures it is important to know where the rebars are located within the concrete slab.

SUMO uses high frequency Ground Penetrating (GPR) to locate these individual rebars, along with a cover meter which can estimate the diameter of the individual bars.

Above: Section View of GPR data showing rebar at 100mm depth.

Above: GSSI 2Ghz Palm Antenna.

Data is either recorded and/or interpreted on site, depending on your requirement, budget and timescales, to produce 3 survey outputs…

Mark out survey
Mark out survey with basic reporting
Post processed Survey with full reporting

Output 1: Mark Out Survey

A basic mark out survey is where a GPR survey is interpreted on site and the location of the rebar is marked in situ. A cover metre may also be used to estimate the depth to the rebar, which is also noted on site. Whether on walls, floors or columns, this method is ideal if intrusive work is planned shortly after the survey, meaning that the contractor knows exactly where to avoid when drilling. There is no permanent record made and so this is only appropriate for the construction phase and not planning stages. This is the cheapest and quickest survey output available.

Output 2: Mark out survey with basic reporting

This option is employed where intrusive work is scheduled soon after the survey, but the site is too complex to warrant a simple mark out survey. It also gives you a permanent record of what was surveyed at that time.

In the example below, a GPR survey was conducted over 6 columns on the fifth floor of a hospital in order to investigate reinforcing and understand the load bearing of the columns before constructing an additional floor above. The location of the surveyed columns was marked on site, then recorded on a digital plan, along with the position of the rebar within those columns.

Output 3: Post processed survey with full reporting

A full desk-based analysis of the data and production of a full report is useful at the design and planning phase and/or if the site is more complex.

In the example below, two layers of rebar have been located (inner mesh and outer mesh). The data is displayed both as radargram (section views of the data) and as a digital plan interpretation. The results indicate that the outer mesh has a cover depth range of 15 - 20mm and the internal, inner mesh cover depth is typically between 50 -70mm. Cover meter readings indicate that the both horizontal and vertical rebars of the outer mesh appear to have an indicative diameter of 7mm.

Section view of the GPR datad (Radargram) showing two layer of rebar

Interpretation of rebar mesh, plotted in AutoCAD

How accurate is SUMO's underground utility survey and what types of utilities can it locate?

Using cutting-edge technologies like electro-magnetics, signal induced threading, and Ground-Penetrating Radar (GPR), our underground utility surveys accurately detect a wide array of buried utilities including metal and plastic pipes, drainage systems, electricity cables, telecoms, and fiber optic cables. The methodology ensures high accuracy without the need for invasive trial holes.
What is the turnaround time for obtaining results with SUMO's Underground Utility Detection service?

SUMO’s service is built for rapid response. Contractors can receive immediate results onsite. Our equipment provides real-time information, and once we leave the site, the detected utilities are visibly marked on the ground surface for quick reference.
Does SUMO provide detailed mapping of the detected utilities for permanent records or construction purposes?

Absolutely, SUMO not only marks the detected utilities on-site but also offers high-quality, color-coded survey drawings. These drawings can include topographic features and a comprehensive record of the utility detection survey, ensuring it meets the client’s needs for future reference or pre-construction design works.
Topographical and Geophysical survey

In addition to mapping out utilities, our experience team can accurately survey the land, creating topographical drawings for use. With our state-of-the-art aerial technology, nothing is missed.
What additional information can be included in the underground utility mapping service provided by SUMO?

In addition to topographic features, SUMO’s mapping service can include fixed surface utility features such as inspection chambers, valve boxes, and telegraph poles. It can also incorporate key topographic details like building lines, fence lines, kerb lines, street furniture, street names, building names, and house numbers, facilitating easy site location.
Does the utility mapping service by SUMO include standard referencing and compatibility with existing survey data?

Yes, SUMO ensures the utility mapping references the ordnance survey grid and level datum as standard. Additionally, the drawings can be supplied to a specified grid and level datum and can overlay an existing topographical survey, making it a versatile and adaptable service for various project needs.
What sets SUMO Services apart from other survey providers?

SUMO stands out due to our impeccable level of service with nationwide coverage, state-of-the-art equipment, and our commitment to delivering top-quality, detailed colour-coded survey drawings in both hard and electronic formats.
How do I request a survey quotation from SUMO Services?

Requesting a quotation is easy. Just click on the "Request a Survey Quotation" button on this page, and our team will get in touch with you promptly.
Can I book a SUMO Survey online?

Yes, you can! Simply click on the "Book a SUMO Survey" button on this page, and you can schedule your survey with us at your convenience.
What type of survey is suitable for my project or site?

Our experienced team will work with you to determine the most appropriate survey for your specific needs. Contact us, and we'll assist you in making the right choice.
Can I obtain both digital and hard copies of survey drawings?

Absolutely. We offer the convenience of electronic copies for digital use and hard copies for your records. Just let us know your preference.
Do you provide custom survey solutions for unique projects?

Yes, we understand that every project is unique. Our team is highly adaptable and can tailor our surveying services to meet your specific requirements.
How do I get in touch with SUMO Services for further questions?

For any additional questions or inquiries, feel free to contact us through the contact form, and our dedicated team will assist you promptly.