Prefabricated Bridge Elements and Systems
Cross Westchester Expressway Viaducts | |
|---|---|
| Location | I-287 in Westchester County 10 miles north of New York City |
| State | NY |
| Completion Date | 1999 |
| Contact Person | George A. Christian P.E. Acting Director Structures Design and Construction Division New York State Department of Transportation State Campus Building 5, 6th Floor 1220 Washington Avenue Albany NY 12232 Phone: (518) 457-6827 Fax: (518) 485-7826 Email: Gchristian@gw.dot.state.ny.us |
| Description | Required to maintain six lanes of congested traffic and limit construction on a restricted site during replacement of two major I-287 viaducts in Westchester County, the New York State Department of Transportation accepted the contractor's value-engineering proposal to incorporate precast segmental voided pier sections for each of the 42 piers, which consisted of 8-foot match-cast segments vertically post-tensioned together and to the footings. Piers ranged from 20 to 55 feet in height, and a typical pier could be erected in one day. The proposal also changed the cast-in-place deck to 10-foot-long by 9-inch-thick precast panels, 42 to 50 feet wide to match longitudinal construction stages, supported on pairs of multi-span continuous steel tub girders. Up to 15 panels could be erected in a single shift, with 'in-line' erection methods used where side access was not available. Prior to grouting the panels to the girders, the entire deck was post-tensioned longitudinally in a variable pattern that was designed to provide a zero-tension deck under design live loads. The precast deck and pier construction reduced the contract's original 34-month schedule to 26 months. |
| Photo |  |
| Prefabricated Elements | total |
| Other Keywords | Precast segmental match-cast pier units; precast longitudinally post-tensioned deck panels; steel tub girders,full-depth deck panels,precast box piers,totally prefabricated bridges |
| Advantages | Minimized traffic disruption by reducing construction time from 34 to 26 months. Improved constructibility by reducing needed access to a site-restricted expressway. |
| Contract Elements | "A+B" bidding and incentive/disincentive provisions. |
| Photo Credits | New York State Department of Transportation |
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