United States Department of Transportation
i
Minnesota Demonstration Project: Rapid Replacement of the Maryland Ave. Bridge over I-35E in St. Paul
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2015-05-01
[PDF-11.89 MB]
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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 Minnesota Department of Transportation (MnDOT) was awarded a $2 million grant to demonstrate the use of proven, innovative technologies for accelerated bridge removal and replacement. This report documents accelerated bridge construction (ABC) techniques used to remove and replace the Maryland Ave. bridge on County State Aid Highway 31 (CSAH 31) over Interstate 35E in St. Paul over a weekend. This report includes construction details of the bridge superstructure built offsite on temporary abutments and prefabricated and cast-in-place bridge components and substructure built following removal of the existing bridge with minimal intereference to traffic flow on I-35E. It also discusses use of a self-propelled modular transporter (SPMT) to move the new bridge into place. Under conventional construction, the closure of Maryland Ave. was estimated at 4 months, but with the use of accelerated construction techniques, the closure of Maryland Ave. was reduced to 2 months. I-35E lane restrictions were also reduced from 12 days to 3 days. Using an SPMT and other ABC techniques added approximately $0.8 million to the initial construction cost of the project. However, the project saved road users about $2.9 million, resulting in a net savings of $2.1 million. Because of the success of this project, MnDOT has decided to use ABC techniques more routinely on future projects as appropriate.
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