Concrete Scanning at Toronto Airport

Xradar were hired as part of the ongoing upgrades at Toronto Pearson's Terminal 1.

Situation

As part of the airport upgrades a number of columns are to be extended from the sub-service level to the ground floor. An area approximately 6’ x 6’ central to the columns on the sub-service level are to be opened up and shored. Openings on the service level and ground floor are to be made in order for the columns to extend through.

With any concrete cutting there is always a risk that utilities or electrical conduits will be hit having adverse consequences and incurring additional costs.

An Xradar technician scanning the area


Solution

Xradar were hired to perform concrete scans of the area to ensure that all cutting, coring and drilling could be done with confidence. In a sensitive environment such as an airport it is imperative to carry out all health and safety and due diligence where possible.

Our Xradar technician was able to scan each proposed cutting area, ensuring that no electrical conduits were struck and operations could continue without any disruptions.

Xradar used a high frequency GPR survey to achieve the required accuracy and a mid-range frequency GPR to reveal information about the structural details underpinning the area. Several grids with evenly spaced lines were laid out resulting an approximately 350 sqm of total coverage.

The Xradar systems used were carefully calibrated onsite to ensure accurate depth measurements. Data was processed and compiled to produce contoured heatmap style results. Results were presented in a CAD workspace and digital reports delivered.

The Xradar survey was complimented with Vuit 3D laser scanning to achieve accurate, scaled georeferencing of our survey grids, and a convenient way to view and present the asphalt thickness results.

The survey revealed a distinct change in the asphalt thickness due to the structural change to the subsurface that was confirmed with the survey results from the mid-range frequency GPR. The data uncovered not only the asphalt thickness but also the nature and location of the subsurface features such as: beams, voids and structural slab changes.

3D Laser Scan, with Xradar results overlaid
Asphalt Thickness Map