Core Drilling : What you need to know before work begins

When GPRS, LLC was contacted to locate steel reinforcement and electrical conduit at The Standard in downtown Atlanta, they were quick to grab their gear and mobilize to the site. With only a few months until turning the property over to the owner, the contractor that hired GPRS was in need of their scanning expertise. GPRS was asked to locate reinforcement, especially post tension cables and rebar, prior to performing core drills for the installation of railings around the exterior balconies. On this particular project, GPRS would be scanning the locations from within the building as opposed to scanning from an aerial lift on the exterior of the building.

It is critical that GPR scanning work be consistent, accurate and thoroughly communicated so there is no confusion once construction activity commences. When GPRS arrived to the development site, they quickly located the project management team and discussed the scope of work. As it was described, GPRS was requested to use the 1600MHz concrete scanner and scan the edge of each balcony opening from floors 2 through 15 in order to locate the reinforcing steel. After looking at the building blue prints and discussing plans with the architect, the GPRS project manager went back to his truck to grab the GPR antenna, his safety gear and fall harness, and returned to the first location to start scanning.

GPRS’s project manager calibrated his antenna and determined the exact scope of his work. As he scanned the slab, he marked directly onto the surface with permanent marker. Once he had determined the layout of the reinforcing, he marked his findings using a straight edge to ensure that the markings made were straight, legible, and easy for the customer to read.

The GPRS project manager at The Standard was able to complete approximately 75 locations throughout the building ensuring that the core drill team would not hit any of the post tension cable present in the concrete slab. It was determined in 2 or 3 of the locations that electrical conduit was present in the slab. The wire for the conduit had not yet been run, but it was still important that the empty conduit be marked and avoided by the drilling crew. GPRS was able to detect the presence of the conduit due to the change in profile and pattern from the surrounding reinforcing members. Soon after GPRS had finished their survey of the concrete slabs, the core drill crew began drilling for balcony railings.

The efforts of the GPRS crew on this project helped the contracting team keep their crew safe, on budget, and on schedule. When GPRS finishes a concrete scan or utility locating project, it shows that they take pride in knowing that their customer can perform his operation with confidence.  Customers of GPRS, LLC know they have been provided the best information regarding the unknowns they may encounter below the surface. The two days GPRS’s project manager spent at The Standard provided much needed information to the crew and owner of this project.

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