Steel in the News
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Posted by Tasha Weiss on April 14, 2011 at 9:13 AM.
The Utah Department of Transportation and contractor Provo River Constructors (PRC) made history overnight on March 26-27 with the successful move of the Sam White Bridge over Interstate 15 in American Fork, Utah. Working with the longest two-span bridge ever moved by Self-Propelled Modular Transporters (SPMTs) in the Western Hemisphere, crews set the new bridge into place at approximately 4 a.m. on March 27 and reopened the freeway at 7 a.m., three hours ahead of schedule. The move was part of UDOT’s $1.725 billion Utah County I-15 Corridor Expansion (I-15 CORE) freeway reconstruction project.
PRC, the consortium of expert local, regional and national contractors and engineers acting as the project’s design-build contractor, constructed the 354-ft, 1,900-ton structure on falsework in a “bridge farm” along the east side of I-15. A steel-plate girder design was chosen for the Sam White Bridge due to its relatively light weight and its ability to follow the profile grade line. AISC / NSBA member Utah Pacific Bridge & Steel Corporation, Lindon, Utah, fabricated the steel for the bridge, which was designed by the Moon Township, Pa.-based Michael Baker Jr., a member of the PRC consortium.
Moving the bridge perched 21 ft in the air involved precise coordination. The two-span structure was raised off the falsework, then moved simultaneously using four lines of SPMTs, which are hydraulic jacks on wheels, controlled by a single joystick.
After raising the structure off its falsework, crews moved the bridge approximately 500 ft across eight freeway lanes—which included rotating it to the crossing’s final 48-degree skew—and lowered into place. To see a two-minute preview and animated simulation of the move sequence, go to http://bit.ly/euZizx. UDOT’s five-minute time lapse video of the actual move is also available at http://bit.ly/eAvSaP.
Located 30 miles south of Salt Lake City, the Sam White Bridge is one of 59 new, modified or rebuilt structures on the 24-mile Interstate reconstruction project. The state-funded project is reconstructing the highway from Lehi to Spanish Fork which connects the northern and southern halves of the state. The I-15 CORE project is scheduled for completion by December 2012. To learn more about the bridge-related aspects of the project, visit http://bit.ly/fcHc8c.