Trenchless Technology

DEC 2018

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W W W.T R E N C H L E S S T EC H N O LO GY.C O M 47 U S I N G A U T I L I T Y P R O B E Equipping HDD crews with an accurate utility locator and making sure they know how to use it goes a long way in helping to verify metallic and conductive underground lines, but what about non- metallic/non-conductive utilities like water, sewer and drain lines? To identify the specific location of these buried utilities, contractors should be using utility probes, or sondes, in conjunction with a utility locator. Probes, or sondes, are an accurate way to track the path of non-conductive utility lines made out of concrete, plastic or clay. Crews simply have to push the probe through an existing utility duct via manhole or hand-hole entry point. The utility locator can then follow the path of the radio-transmitting probe from above ground. It's a quick and accurate way to pinpoint the location and depth of these utilities, which can help reduce the risk of striking or intersecting with another underground line while boring. Mike Carway with Nextier Infrastructure Solutions and his crews have been using McLaughlin utility probes for several years and said he couldn't imagine what life would be like without them. " Too many contractors take unnecessary risks by not doing an efficient job of verifying locates," he explained. " That lack of professionalism gives the whole industry a black eye. I think the reason some companies choose to cut corners is because verifying the location of utilities can be labor-intensive and time-consuming. Using probes in conjunction with our Vermeer Verifier G2 locator made by McLaughlin, we've been able to cut the amount of time we spend potholing in half on a lot of projects in urban areas. Probes save time and are easy to use." Nextier performs almost 90 percent of its work around downtown Atlanta, Georgia, and with all of the concrete around, verifying underground utilities by potholing can be a significant challenge. Using multiple sizes of McLaughlin probes that vary in diameter and length, the Nextier team uses underground access points in manholes and hand- holes to gain access to utility ducts. "It 's not uncommon to open a manhole and see 12 different duct openings," Carway said. "We identify any vacant ones and run the probe through it, so we know exactly where those lines go, which helps reduce the number of utilities we need to expose before completing a bore." Carway has had several contractors ask him about probes recently and when he explains the process and efficiency of it, they usually go out and buy one. "A lot of the guys I've talked to about probes will call me back after using them and tell me it paid for itself on the first job," he said. "Any utility contractor not using probes either doesn't know they exist or just wants to make their crew 's job harder than it has to be as far as I'm concerned."

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