Sundt Construction, an AGC member of several chapters based in Tempe, Ariz., successfully placed the first of 12 pre-cast arches on the West 7th St. Bridge in Fort Worth, Tex. on May 10. The bridge is a popular east-west thoroughfare in Fort Worth that connects downtown to growing mixed-use developments and the Cultural District. The project involves the replacement of the aging West 7th Street Bridge with a new signature structure – the world’s first pre-cast network arch bridge.
The $25.9 million project uses innovative design consisting of lighted, pre-cast concrete bridge arches that rise more than 20-feet above the roadway surface at their highest point. The main structural elements of the bridge consist of 12 pre-cast, post-tensioned concrete arches that are 163 feet long and weigh approximately 640,000 lbs. The tied arches will utilize highly polished stainless 1 ¾” stainless steel hangar rods connecting the rib to the tie beam on the outside of the bridge.
Off-site construction of the pre-cast bridge elements began in January 2012 in a casting yard. Sundt is able to install fencing and bracing and build columns for arches by only closing outside lanes during concrete pours. The company will haul the arches to the project using self-propelled mobile transports and set in place with twin Liebherr 1400 cranes with superlift.
The entire West 7th Street Bridge will be closed in June 2013 while the existing bridge is removed and the new deck is placed. The full closure will take no longer than 150 days. The new West 7th Street Bridge will be open to traffic Oct. 1, 2013.
Once complete, the new West 7th Street Bridge will have four lanes and include a center raised median to separate vehicle traffic. Pedestrians and cyclists will have safer and improved mobility on the new bridge, which includes separated 10.5-ft pedestrian/bicycle travel ways on the outside of the bridge arches.