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Going the Extra Mile on the the Job

GPRS was called to our site after the general contractor had discovered that a number of electrical floor boxes had been covered over during the concrete pour. The pour was a 12” thick, elevated concrete slab. It was the objective of GPRS to scan the elevated concrete slab and identify the location of the floor boxes that had been mistakenly covered in the final pour. GPRS delivered in a huge way on this one!

Using what is called a SIR3000 head unit with a 1600MHz GPR antenna, the technicians quickly got set up, calibrated the equipment to the specific slab they were on and began to diagnose the conditions. They began by scanning large areas of concrete to determine the structural layout of steel and other embedments in the slab. After determining a typical rebar and post tension layout, they began to hone in on the anticipated floor box locations as pointed out by the general contractor. With each area cleared and ready to be GPR scanned, the GPRS team was able to quickly identify electrical box number one. The GPR crew quickly moved around the slab to scan and identify electrical boxes within the slab. In total, GPRS located all 15 floor boxes that had been covered.

During the GPR scanning process, GPR technicians had located a number of high priority targets. Targets such as live electrical conduit, #4 rebar, post tensioned cable and beams. Many of these features came as a surprise to the contractor on site and it turned out to be extremely valuable information. Knowing where these obstructions were in the slab potentially saved the project from undue delays and injury if the drill crew would have drilled into one of them.

While on site, the GPRS Project Manager had a new team member with him whom he was training. When asked, GPRS was proud to discuss how thorough and valuable their training program is and why it is critical for new hires to join the senior technicians on job sites. The pair of GPRS technicians moved around the slab and discussed the structural makeup of the building. The senior technician pointed to features such as slab thickness, the columns and beams, fixtures hanging from above and how those might help in identifying where the floor boxes might be, and so on.

When the GPRS men finished up, they approached our crew and asked if we could spare a minute to walk the slab and discuss their findings. The technicians took the time to walk to each location they had scanned and thoroughly discussed what they had found in the slab and how to interpret the markings they had drawn. After reviewing a few locations with them, we could sense the confidence they had in what they had found and we immediately had piece of mind that our crew would be safe when chipping out the floor boxes.

We were able to complete the procedure with great success and recovered all 15 floor boxes. Thanks to GPRS, we are on to the next phase of our project and we were able to save cost and time because of the expertise of GPRS.

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