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.
Penhall saves contractor thousands of dollars by scanning before core drilling after a competitor started drilling without scanning first
On a recent ongoing jobsite a Penhall customer asked the Nashville analyst if he could take some time to inspect a competitor’s work on another jobsite. The local analyst discovered the competitor cored into a post tension parking deck without scanning, solely relying on locating the cables thru installers memory. This resulted in several post tension anchors being struck, even causing the core drill bit to be permanently stuck in the cored location. The resulting Post Tension strikes ended up having to be replaced causing thousands of dollars of rework and could have potentially caused injury to the competitor’s employee.
The Analyst returned with an experienced core drill operator and successfully and without incident completed the parking deck cores.
Never take the word of worker or installer for the location of Post Tension cables within a slab. Always have them located by a qualified person. Not only could you avoid costly repairs, but also avoid serious injury to your employees.
Concrete scanning with a 2-D report verified by engineer prior to core drilling or cutting
Sometimes 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
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.