The Right Wall for the Site Gravity walls and geogrid-reinforced walls each have a place —sometimes on the same project. BY STEVE GOLDBERG Keeping Utah Moving fter 22 months, 708,000 man-hours of work, nearly half a million tons of con-crete, and $215 million, the massive Interstate 15 (I-15) reconstruction project in Utah has been completed. The Point project, as it was known, involved 7 miles of the most heavily traveled highway in the state. “Most of the population in Utah is centered around the I-15 corridor, so it’s the main route through a lot of the state’s cities,” explains Dan Tix, engi-neer and director of technical services A for Keystone Retaining Wall Systems, the retaining wall engineering firm for the job. “The population has been growing. The expansion of the highway was necessary to accommodate the additional traffic going through the area. The expansion was particularly needed at this choke point.” The interstate was widened to six lanes in both directions, replacing the existing roadway with new 40-year con-crete. According to the Utah Depart-ment of Transportation (UDOT), 160,000 vehicles travel through this sec-tion daily, with an increase to 220,000 vehicles daily expected within three years, leading to stop-and-go gridlock. A number of geogrid-reinforced retaining walls for roadway support were part of this major undertaking. An important requirement of UDOT, however, was that all of the existing freeway lanes were to be open and available during peak travel times every day, during the entire construction process. “We had to come up with solutions to help them maintain their lanes of traffic open during those peak hours,” says Tix. “There were specific work WWW.EROSIONCONTROL.COM 32 EROSION CONTROL REDI-ROCK
Visit Article: http://digital.erosioncontrol.com/article/The+Right+Wall+for+the+Site+Gravity+walls+and+geogrid-reinforced+walls+each+have+a+place+%E2%80%94sometimes+on+the+same+project./2787859/408278/article.html.