ASPIRE is a quarterly magazine published by PCI in cooperation with the associations of the National Concrete Bridge Council. The editorial content focuses on the latest technology and key issues in the Concrete Bridge Industry.
Issue link: http://www.aspiremagazinebyengineers.com/i/297000
With a little creativity, teamwork, and technical know-how, a contractor and their construction engineer were able to develop an alternative approach to the Marble Falls Bridge replacement project that won the contract and ultimately saved construction costs and time. S t a r t e d i n D e c e m b e r 2 0 1 0 , t h e $28.65 million demolition and bridge replacement project is already ahead of its expected four-year construction s c h e d u l e . T h e f i r s t o f t w o n e w segmental bridges carrying U.S. 281 over the Colorado River in Marble Falls, Tex., opened to traffic in December 2012. The twin bridges will carry two lanes each to replace a functionally obsolete steel truss bridge that was built in 1936. Designed by the Texas D e p a r t m e n t o f Tr a n s p o r t a t i o n 's (TxDOT's) bridge division, the crossings include 6-ft-wide sidewalks and a fully lighted substructure and surface lighting, creating a beautiful backdrop to downtown Marble Falls. U.S. 281 is a major north-south highway from the Canadian border to the Mexico border, and serves as an important evacuation route for the area. The 958-ft-long, straight bridge, on a vertical grade of 1.3%, consists of two parallel, three-span, variable-depth, single cell, cast-in-place, concrete segmental box girder superstructures with span lengths of 274, 410, and 274 ft. There were several factors leading to the selection of a segmental design: profile U.S. 281 Bridge over the Colorado river / Marble Falls, Tex. BRIDGE DESIGN ENGINEER: Texas Department of Transportation, austin, Tex. ALTERNATE SUPERSTRUCTURE DESIGN AND CONSTRUCTION ENGINEER: FINleY engineering Group Inc., Tallahassee, Fla. CONSTRUCTION ENGINEERING INSPECTION: Texas Department of Transportation, austin, Tex. PRIME CONTRACTOR: archer Western Contractors, atlanta, Ga. CONCRETE SUPPLIER: Ingram readimix Inc., New braunfels, Tex. POST-TENSIONING CONTRACTOR, FORM TRAVELER, AND POST-TENSIONING MATERIALS SUPPLIER: Vsl, Fort Worth, Tex. Panoramic view of completed northbound bridge across the Colorado River in Marble Falls, Tex. All photos: Archer Western Contractors. U.S. 281 Bridge by Robert Alonso, FINLEY Engineering Group Tailor-made work approach saves time, money at Marble Falls crossing over the Colorado River 10 | asPIre , spring 2013 P R O J E C T MarbleFalls_Spr13.indd 10 4/1/13 11:15 AM