| Description | The Pennsylvania Department of Transportation had a 240-foot long, 42-foot high, 740-ton steel truss railroad bridge built adjacent to Interstate 76 and then rolled into place over a weekend in October 2002. The new bridge is part of a multi-year project to widen US 202, which carries between 70,000 and 105,000 vehicles daily, and to improve key interchanges. The truss was built on steel mats that supported the dead load and large flange beams. To move it, crews erected a steel support tower on I 76's westbound side and a runway system to prepare for rolling out the truss bridge. They raised the truss onto four 330-ton Hillman rollers and used hydraulic winches to pull it to its final position over the expressway. The steel truss structure is only half of the new railroad bridge: the other half is being built in place adjacent to I 76's eastbound lanes and has no impact on traffic. |