United States Department of Transportation
i
South Carolina Demonstration Project: Black River Bridge Replacements on SC 377 in Williamsburg County
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2011-10-01
[PDF-2.39 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 South Carolina Department of Transportation (SCDOT) was awarded a $1 million grant to demonstrate the use of proven, innovative technologies for accelerated bridge replacement. This report documents the contracting methods and construction techniques used to replace four consecutive bridges over the Black River in Williamsburg County. This report includes construction details of A+B+C contract bidding with built-in no-excuse incentives and precast bridge beams made with self-consolidating concrete used to replace the existing bridges rapidly, safely, and with less negative impact on the traveling public than using conventional construction methods. Under conventional construction, the impact of this project on travelers was estimated at 28 months, but with the use of innovative contracting and construction methods, the impact was reduced to 14 months. This is a 50 percent reduction in the time required to complete the project. In addition, the contractor finished the bridge portion of the project in about 180 days, 185 days sooner than the maximum allowable time set by SCDOT or 50 percent sooner than projected. Using innovative contracting techniques added an estimated $1.5 million to the initial construction cost of the project, compared with the trailing bid for this project. However, a more comprehensive economic analysis that included a closer look at the construction cost shows that the project potentially saved highway users about $6.9 million (or about 40 percent of the total $17.1 million project costs). Because of the success of this project, SCDOT plans to encourage project managers to apply these contracting methods to future projects.
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