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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.

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What are we scanning? Slab on grade, suspended slab, etc.

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Nashville Concrete Scanning Projects that Penhall Works On

Concrete scanning with a 2-D report verified by engineer prior to core drilling or cutting

2-d concrete scanning reportSometimes a Penhall GPR Analyst not only has to satisfy the needs of the customer, but also the General Contractor that over sees the customer. On a new jobsite, the local analyst began scanning several locations ahead of scheduled core drilling and slab cutting. Due to multiple hazard strikes from different sub-contractors, the General contractor inquired if the analyst was able to provide a report for locations scanned. The local analyst informed the General Contractor that any Penhall GPR Analyst could write up either a 3-D image scan report, or a quick 2-D field report for any areas that are scanned. The analyst informed the General contractor that 3-D reports require extra scanning time and billable office time to generate the reports. While the 2-D reports take much less time and can be completed onsite, and turned over to the customer when scanning is completed. The General Contractor stated that the 2-D report would be adequate for documentation and verification purposes, and requested them for each scanned area.
After completing the field reports, they were given to the customer to be verified by an engineer of the General Contractor prior to any coring or cutting was authorized for an area. This helped to ensure proper communications between the customer, customer sub-contractor, and General contractor to help eliminate any incidents due to bad communication. This also showed the General Contractor that Penhall is committed to safety and satisfying any needs that arise in a timely and courteous fashion. Due to The analyst being willing to work with the General Contractor, the General Contractor has recommended that all other subs use Penhall for any GPR scanning.

Locate post tension cables in concrete slab

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

Concrete scanning to find obstructions before cutting wall openingsFor 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

locate post tension cables and live power in concrete slabRecently, a concrete company hired Penhall Technologies to scan two beams and the ceiling. The customer wanted to know the lay out of rebar in the beam. In addition, he wanted to know if any post tension cables were 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. The analyst performed the scanning from a scissor lift, maneuvering narrowly spaced wooden support braces. The analyst provided 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.

Concrete scanning in preparation for core drilling and mechanical openings

Nashville concrete scanning before core drilling 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.