Commitment to Safety • Reliable Results
Responsive Resources • Established Expertise
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.
Tampa Concrete Scanning Projects that Penhall Worked On
GPR scanning before installing anchors
Recently, a builder in the Tampa area contacted Penhall Technologies for concrete scanning services. They needed to scan six floors of elevated concrete slabs prior to installing anchors and moving toilet locations. Our analyst used a 2700 MHz unit, to scan over 1000 linear feet of concrete. He marked out rebar and post-tension cable locations directly on the elevated slabs. This method of marking makes it easy for the contractor to efficiently work while also avoiding costly post-tension cable repairs.
Locate rebar before drilling holes
An electric services company hired Penhall Technologies to scan the face of a wall above a doorway. The company needed to know rebar locations so that they could safely drill a hole to run conduit. Using a 2700 MHz GPR unit, one of our analysts scanned the face of the wall and marked out the rebar pattern above the door. In this case, we found odd diagonal bars that broke the normal rebar pattern. This would have been very difficult to avoid without scanning.
Ground penetrating radar used to locate post tension cable and reinforcing steel
Penhall Technologies Tampa Branch scanned 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 analyst marked the location of the post tension cables and reinforcing steel on the surface. These were preserved with a clear coat. 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 analyst scanned the concrete areas using a 2600 MHz GPR antenna. Each area, approximately 4’ x 7’, didn’t show any post tension cables, reinforcing steel, and conduits in the concrete slab. The analyst determined that the concrete was slab on grade with wire mesh reinforcing. He marked the location of the wire mesh 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. The customer requested a written report, 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 we locate any obstructions 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.
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 was as shallow as 1” below the surface. This allowed the general contractor to know where to grind and chip the concrete safely