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Penhall Technologies can help you locate rebar, pipes, post and pre tension cables, conduits and many other subsurface hazards that may be hidden in concrete. Our expertly trained analysts can also detect voids within or underneath concrete slabs. As a safety leader in the industry, contractors, engineers, and government agencies have come to trust Penhall first for safe and precise scanning services.
Ground penetrating radar used to locate post tension cable and reinforcing steel
Penhall Technologies Tampa Branch was called to scan a concrete slab on the 3rd floor during construction of new apartment buildings. The plumbing contractor needed to drill for additional plumbing lines from the 3rd floor to the 2nd floor at 2 separate areas. Penhall Technologies used a GSSI 2600Mhz ground penetrating radar unit to scan each area. The location of the post tension cables and reinforcing steel were marked on the surface and preserved with a clear coat to protect the markings. By locating the post tension cables and rebar, the contractor was able to drill without causing damage. GPR is a quick and safe way to locate anomalies in concrete and is ideal for slab on grade projects. Other GPR concrete scanning applications include locating of conduits, voids and verification of rebar placement.
Concrete scanned using GPR prior to drilling anchor holes
A contractor at the University of South Florida needed to install a new trash chute in a student housing complex. Prior to drilling holes for anchors, the concrete areas were scanned using a 2600 MHz GPR antenna. Each area, approximately 4’ x 7’, was cleared of post tension cables, reinforcing steel and conduits in the concrete slab. During the scanning, it was determined that the concrete was slab on grade with wire mesh reinforcing. The location of the wire mesh was marked in black crayon. By marking the location of the wire mesh, the contractor could drill without damaging any of the structural reinforcing in the concrete. GPR is a quick and reliable method to locate pt cables and rebar in a variety of concrete applications.
Scan concrete wall prior to cutting to avoid conduits
At the Tampa International Airport, Penhall Technologies scanned concrete prior to core drilling to locate and mark existing conduits and reinforcing steel in the wall. By locating the hazards, the contractor could drill safely. GPR only requires access to one side of the wall and can be performed during normal business hours. A written report was requested by the customer which detailed the service and provided documentation of the work.
Locate reinforcing steel before installing support columns for reconstruction
Penhall Technologies Tampa office completed scanning at an office building to locate reinforcing steel prior to installing support columns. The customer requested that any obstructions be located prior to drilling to install the columns. Penhall used ground penetrating radar technology to scan and locate anomalies in the concrete slab. By using GPR, the analyst can determine the location of anomalies such as reinforcing steel, embedded conduits and post tension cables. The service is completed in real time and the findings are marked directly on the surface, which helps to keep projects on time. GPR uses no radiation and poses no health hazards which makes it safe to use in both commercial and residential settings.
Penhall Technologies determines various depths of rebar in preparation for demolition
In January 2017, two of our GPR Field Supervisors came together to perform concrete scanning the Tampa International Airport in preparation for the new automated people mover.
This took a total of 2 weeks of 8 hour days to complete. The goal was to determine the depth of rebar in the concrete so the demo crews could come in and grind & chip the concrete down 1-2” without causing damage to the existing rebar. The analysts discovered that although the majority of the rebar was deep enough in the concrete and would not be disturbed, some rebar were located as shallow as 1” below the surface. This allowed the general contractor to know where to grind and chip the concrete safely