Big city problems

摘要

With a population of 270,000, Greensboro, N.C., is a genuinely big city, and it also is part of the Piedmont Triad, the nation's 30th largest metro area-all told, Greensboro Asphalt Section Supervisor Jordan Lambeth is responsible for the maintenance of about 4,000 lane-miles. "And a lot of our infrastructure is over a hundred years old," he pointed out. "So we are always doing a lot of repaving and maintenance." In 2000, Greensboro began using the American Highway Products Pivoted Tumbuckle Manhole Riser to raise manholes to grade after asphalt overlays or simply to raise manholes that have subsided over time. Lambeth knows the risers well-he has been involved in city road maintenance for 11 years, and has spent plenty of time on crews actually installing them. He has raised manholes the other way, too. "We used to raise all our manholes by jackhammering up the old frames, raising them with concrete rings, and then paving around them," he said. "It could take half a day."