United States Department of Transportation
i
Maryland Demonstration Project: Baltimore-Washington Parkway/West Nursery Road Bridge Superstructure Replacement Using SPMTs
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2013-06-01
[PDF-7.60 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 Maryland State Highway Administration was awarded a $600,000 grant to demonstrate the use of proven, innovative technologies for accelerated bridge superstructure removal and replacement. This report documents accelerated bridge construction techniques using self-propelled modular transporters (SPMTs) to remove and replace the superstructures of two West Nursery Road bridges over northbound and southbound Baltimore-Washington Parkway (MD 295) over two consecutive weekends. This report includes construction details of the bridge superstructures built in the median of MD 295, just north of the existing bridges, on temporary support structures. Using conventional construction methods, the impact of this project on the traveling public was estimated at 7 months, during which four lanes of West Nursery Road traffic would have been reduced to two lanes, one in each direction. However, using SPMTs reduced the impact to 2 weekend nights for MD 295 northbound and southbound traffic and 2 weekends, from midnight on Friday to 8 a.m. on Sunday, for West Nursery Road users. The traditional approach would have included a temporary bridge to carry West Nursery Road traffic during construction. It would have also required reconfiguring ramps, acquiring right-of-way, and constructing temporary approach roadways to the temporary bridge. The estimated cost of the temporary bridge was about the same as the $865,700 cost for SPMT deployment, but the SPMT option reduced user costs by $324,000, about 7 percent of the project construction cost. Because of the success of this project, the Maryland State Highway Administration will consider SPMT use on future projects, where it is feasible and appropriate for conditions.
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