Trenchless Technology

SEP 2018

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Page 45 of 83

preserve as much material as possible and to ensure the grouting technicians didn't have to work in chest-high wa- ter, Applied Polymerics installed a cof- ferdam of corrugated pipe and secured the pipe with joists against the culvert ceiling and sealed it at the bottom. " We worked closely with the DOT," said Kammerer. " We worked with their dive team on the cofferdam and the DOT provided a crane. Crew mem- bers from the DOT were there nearly all the time we were. It was a good partnership." Crews worked around the clock Tuesday until Friday. An NCDOT en- gineer allowed both lanes to open for the weekend and give crews a respite. Ofƒicials closed one lane again Monday afternoon so grouting work could con- tinue. Crews worked around the clock again until completion on Wednesday. The void was more than double the originally estimated 80 cubic yards. In the end, it measured between 180 to 200 cubic yards. Prime Resins ensured crews had the material they needed when they needed it. "The manufacturer came through with material as needed — it was al - ways there on time," said Kammerer. Crews ƒilled the void and NCDOT of- ƒicials opened I-95 to normal trafƒic. Issues of wash-out under culverts are a common occurrence. Another customer of Prime Resins had a simi- lar problem requiring culvert repair in a tidal creek. Again, the wash out underneath the culvert created a need for soil stabilization and void ƒilling . This was also solved using Prime Flex 985 LX20. Winchester Creek ƒlows through a box culvert running underneath U.S. Highway 101 along the Oregon coast. The seal had broken away from a joint about 70 ft down the culvert and the creek was washing the soil from behind the culvert. This erosion was under- mining the road bed. A.C.C. owner Andrew Kuperstein and his crew drilled holes through the culvert wall and injected Prime Flex 985 LX 20 through 6-ft pipes to ƒill the voids, stabilize the soil and pre- vent future erosion. The 985 is a two- component polyurethane that expands and cures to form a closed cell struc- tural foam with excellent compressive strength needed under the highway. The site is on a tidal estuary, so work could only be done during low tide, which meant starting at 5 a.m. for a few hours and again at 7 p.m. for a few hours. An added wrinkle was a genera- tor malfunction that prevented them from using their pump for part of the job. Fortunately, the Prime Flex 985 is a versatile product that they could batch mix and pour into the joint. "The product worked like it's sup- posed to," said Kuperstein. "It's a nice product to work with; it's nice that it doesn't have to go through the equip- ment." The job was a success and Ku- perstein has been asked to go back in the summer and seal a crack he discov- ered on the other side of the culvert that is starting to wash out. For that project he'll use Prime Flex 900 XLV and the activated oakum technique to seal the crack. Kevin Anthony is with Prime Resins. 46 T R E N C H L E S S T EC H N O LO GY S E P T E M B E R 2018 A crew member injects grout into a void.

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