Commitment to Safety • Reliable Results
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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.
Locate post tension cables in concrete slab
At a site in Nashville, TN, Penhall was requested to do concrete scanning to locate post tension cables. Using ground penetrating radar, we scanned four separate areas on a 7″ concrete slab.
GPR scanning used to find obstructions before cutting wall openings
For another client in Nashville, TN, we used GPR concrete scanning to examine a 6″ thick wall in preparation for three door openings, each measuring 3′ x 7′. This is one of many reasons why concrete may need to be scanned for obstructions.
A combination of Ground penetrating radar and radio detection used to locate post tension cables and live power in concrete slab
Recently, a concrete company hired Penhall Technologies to scan two beams and the ceiling to identify and locate Post Tension cables and Rebar. The customer wanted to know the lay out of the rebar in the beam and post tension cables running in the elevated slab to attach steel plates for increased structural support. The customer needed to drive five inch bolts into the concrete to anchor the steel plates in place. Penhall Technologies’ Nashville Analyst scanned roughly 1,350 Sq. /Ft. from a scissor lift, maneuvering between numerous and narrowly spaced wooden support braces. The analyst used the GSSI HD Mini that utilizes a 2600 MHz antenna to scan the areas and followed up by performing sweeps with the SPX Corp. radio detection device (RD 7000), which will pick up any live power or communication lines. The analyst was able to exceed the expectations of the client also providing a Post Tension layout for a column location where the supporting rebar was not put in place, requiring four one inch cores so the missing rebar could be inserted without having to destress the [over a dozen] post tension cables in that area or completely chipping out the slab, saving the customer time and money. The project was completed in a safe and non-destructive manner. Penhall Technologies of the Greater Nashville, TN area has the capability and the man power to meet your needs in a timely manner, ultimately ensuring your projects get finished safely and on time.
Concrete scanning in preparation for core drilling and mechanical openings
On a recent downtown Nashville jobsite both the local analyst and local operators worked side by side to ensure the work was performed efficiently and safely. The customer, a national engineering, mechanical, plumbing and electrical contractor, was needing core holes and square cut mechanical openings on multiple floors in elevated slabs with Post Tension cables, live electric, electric conduit, and electrical “smurf tube” running throughout the decks.
During scanning multiple locations were shown to have hazards in the slab that needed to be avoided, working together, the analyst, operators, and customer produced solutions that best suited the customer’s needs. Utilizing the GSSI HD Mini in open areas, the GSSI SIR 3000 with Palm Antenna in confined areas, and the RD7000 transmitter and metal fishing tape to locate hard to GPR identify “smurf tube”, all hazards were avoided and the customer was so pleased with Penhall Company and Penhall Technologies performance that they informed the local office that they would be utilizing Penhall Concrete services again when the next set of core holes are ready to be scanned and drilled.