top of page
shutterstock_1169366116.jpg
ArrowBackground.png

GEOPHYSICAL
ENGINEERING

Concrete Reinforcement Mapping (Rebar)

EngineeringGeophysicsIcon.png

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.

GPR.jpg
PalmAntenna.jpg

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…

  1. Mark out survey

  2. Mark out survey with basic reporting

  3. 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.

ExteriorWall.jpg

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.

SurveyColumn.jpg
Column029.jpg

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.

GPRdata.jpg

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

AutoCAD.jpg

Interpretation of rebar mesh, plotted in AutoCAD

ArrowBackgroundLong.png
SideStripes.png

FREE SURVEY QUOTATION

 

Receive a FREE Survey quotation from one of our survey engineers?

 

Chat through any requirements you need, including site survey, survey methodologies and detail requirements.

Geophysical Engineering Surveys
 

Air Raid Shelters

Air Raid Shelters

Cellars & Basements

Cellars & Basements

Post Tension Cables

Post Tension Cables

Underground Storage Tanks

Underground Storage Tanks

Air Voids

Air Voids

Chimney Flues

Chimney Flues

Rebar

Rebar

Water Engineering

Water Engineering

Badger Setts

Badger Setts

Earthing Installations

Earthing Installations

Sinkholes

Sinkholes

Burials

Burials

Geological Application

Geological Application

Soil Thermal Resistivity Testing

Soil Thermal Resistivity Testing

Buried Foundations

Buried Foundations

Landfills

Landfills

Structural Investigations

Structural Investigations

Buried Manholes

Buried Manholes

Mineshafts

Mineshafts

Tree Roots

Tree Roots

bottom of page