How to Move 30 Million Pounds – Milton-Madison Slide Details
On April 10, 2014, the 2,428-foot-long truss superstructure of the Milton-Madison Bridge made history when it was moved 55 feet from temporary bridge piers onto its permanent, rehabilitated piers, making it the longest bridge slide in North America.
The bridge is one of only two crossings of the Ohio River between Cincinnati, Ohio and Louisville, Kentucky (100 miles). A requirement of the ARRA funding used to build the project was that the bridge needed to be replaced on its current alignment. The project was implemented as a design-build with provision for a contractor-supplied ferry service to maintain traffic during the bridge replacement. The ferry service, free to users, was to accommodate 240 vehicles per hour during daylight hours for a one year period. During the bidding process, the design-build team proposed an idea to eliminate the ferry service, build the new superstructure next to the existing bridge and slide it laterally into place, allowing traffic to be maintained on the existing bridge, except for two brief closures.
Part 1 of this presentation will provide an overview of the project, including a description of the concepts used to maintain traffic and the temporary works needed to accomplish the work.
Part 2 of this presentation will describe the sliding processes in detail. Two processes were used. The 2,428-foot-long truss was pulled laterally via sliding harnesses and utilizing its permanent bearings. A 110-foot-long prestressed concrete girder span was also pulled laterally using temporary sliding bearings.