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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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Houston Concrete Scanning Projects that Penhall Worked On

Penhall Technologies scans post tension slab at a private residence

Penhall Technologies scanned for anchor bolts at a private residence. The slab was a post tension slab and the customer wanted to know exactly where the cables were. The customer pulled the carpet up so the analyst could take measurements from the wall to each cable. The customer was going to use these measurements, after putting the carpet back, so he knows exactly where each cable is. Every object was scanned and marked out on the concrete. The post tension cables in the slab were approximately 4 feet apart, which is typical of floating post tension slabs. The customer also wanted to know if the cables were at the same depth, which they were not. He found this very interesting as he thought post tension cables never changed depth.

Houston GPR Analyst confirms patterns of post tension cables with concrete scanning to ensure safety when core drilling

concrete scanning to locate post tension cable patterns before core drillingHouston GPR Analyst scanned nine different locations in preparation for core drilling in a new apartment complex in downtown Houston. The customer needed to move existing shower and toilet plumbing and asked for the scan to be conducted around the new proposed plumbing site to identify any hazards such as conduits or post-tension cables. The equipment used to conduct the scan was a GSSI Mini which typically can only scan at a max depth of 12”. Because of the 18” thickness of the slab, the analyst needed to scan from both sides of the slab to ensure the correct data was collected. The analyst discovered that the tension cables were approximately 44” a part and confirmed this with the customer as they had the post tension diagrams. The customer was able to safely and confidently core in all scanned areas saving both time and money and ensuring safety on the job site.

Locate post tension cables as well as live conduits within a concrete slab before drilling for anchors

concrete scan to locate post tension cables in houstonA construction company in charge of building the new parking garage on Rice University campus wanted to know where the post tension cables and any other possible hazards were in the slab. They were going to be installing anchors for pads on the slab. The anchors were only going to be about 3”-4” into the slab. The cables and conduits were mostly deeper than 4” but they still wanted to see exactly where they were. In some places the cables did come close to 4” however. Our GPR Analyst was able to verify the locations of the cables as they could be seen protruding out of the side of the slab edge. Because of this, the analyst was able to trace them out from the edge to the desired location of the anchors. The RD 7100 was then used to verify some of the conduits that had marked out. The desired areas were scanned effectively in which the customer was very pleased. The pads were later installed without any trouble.

Concrete scanning for a slab trench

concrete scanning for slab trenchIn Sugar Land, TX, Penhall was requested to perform scanning on a trench measuring 20′ long and 1″ wide. We used ground penetrating radar to perform the scan.

Ensure safety when drilling using GPR scanning to detect hazards

Houston gpr concrete scanning Before performing core drilling for 4″ diameter holes, a location in The Woodlands, TX requested Penhall to perform scanning of two areas on a 14″ concrete slab. After scanning, it was now safe to move forward with the core drilling.

Ground penetrating radar used to locate utilities and structural steel elements

GPR scanning to locate buried utilities and structural steel elementsIn Houston, TX, Penhall was asked to perform a scanning on ground level at a job site. Through GPR scanning we were able to locate buried utilities and structure steel elements before core drilling and saw cutting.