United States Department of Transportation
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Edition:Final Report
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Abstract:As part of a national initiative sponsored by the Federal Highway Administration under the Highways for LIFE program, the Colorado Department of Transportation was awarded a grant to help replace the Bronco Arch Bridge carrying I-25 over the South Platte River in Denver to demonstrate the use of proven, innovative technologies for accelerated bridge removal and replacement. This report documents accelerated bridge construction technique using precast bridge elements and systems (PBES), with virtually no disruption to daily traffic of over 200,000 vehicles that use this portion of the interstate. The 60-year-old original structure was a steel arch that local residents dubbed the Bronco Arch because of the site’s proximity to Mile High Stadium where the Denver Broncos play football. The new structure is shorter and wider than the original structure (371 feet long by 197 feet wide versus 384 feet long by 158.5 feet wide). It has a five-span layout, 71 feet-30 feet-118 feet-30 feet-119 feet. Eight lines of girders support an 8-inch full-depth precast concrete deck system. Each girder line consists of three precast concrete pretensioned and posttensioned 72-inch-deep U girders cast in lengths of 95.0, 136.5, and 133.5 feet. The new bridge is designed as a rigid frame with integral connections between the substructure and the superstructure. The distinctive-looking piers simulating the look of arches were precast at the site and placed immediately following caisson construction, eliminating the need for forming and pouring, resulting in reduced construction time. The use of PBES reduced construction time by more than 2 months, avoiding an estimated 58 crashes at this location. The contractor maintained preconstruction lane capacity during construction, virtually eliminating impacts on traffic. Because of the success of this project, Colorado plans to accelerate bridge construction using PBES on future projects, where this innovative technology is feasible and appropriate for conditions.
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