United States Department of Transportation
i
I-84 Bridge over Dingle Ridge Road Replacement using Superstructure Slide-In Technology
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2014-10-01
[PDF-6.31 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 New York State Department of Transportation (NYSDOT) was awarded a $2.1 million grant to demonstrate the use of proven, innovative technologies for accelerated bridge removal and replacement. This report documents accelerated bridge construction techniques using prefabricated superstructure slide-in technology to replace two Interstate 84 bridges over Dingle Ridge Road in Putnam County. Each new superstructure was installed during a 20-hour time period over a weekend. This report includes project/site challenges, construction details, deployment of the lateral slide-in technology, and NYSDOT’s public outreach efforts to minimize impact to traffic. Under conventional construction methods, the project would have taken 2 years to build and would have required the construction of a temporary roadway and bridge to channel traffic during construction. This would have increased delays during peak hours of travel. Using precast elements and lateral slide-in technology, the project was built in 1 year, and the impact to travelers in each direction on I-84 was reduced to a detour for 20 hours. Furthermore, by reducing traffic impacts substantially, it is estimated that NYSDOT avoided six crashes, one of which could have potentially resulted in injury/fatality. The innovative technology resulted in savings of $0.9 million in construction costs and $1.37 million in user delay costs. Together, the savings represent 22 percent of the $10.2 million construction cost of the project. Because of the success of this project, the NYSDOT plans to use the lateral slide-in technology on future projects where this innovative technology is feasible and appropriate for conditions.
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