PROJECT OVERVIEW

LONG TRAIN RUNNING

(Long Train Running, Doobie Brothers | Songwriter: Doobie Brothers)

 

MNR Atlantic Street Bridge Replacement

SIMPLE AS ABC? - ACCELERATED BRIDGE CONSTRUCTION

The replacement of the Metro-North Railroad Bridge over Atlantic Street in congested downtown Stamford, Connecticut and adjacent to I-95 is the first use of accelerated bridge construction (ABC) methods to replace a railroad bridge in the state in a nine day period spanning the July 4th weekend. Adjacent to Stamford Train Station, the busiest between Grand Central and Boston, the existing bridge carried five tracks.

MNR Atlantic Street Bridge Replacement

As simple as ABC? Only with extensive planning and constructability review. Working for AECOM, GEODesign provided geotechnical engineering services from preliminary through final design and construction support, providing sub-surface explorations, foundation design for staged construction including temporary jump spans while keeping railroad and automobile traffic moving and providing earth support to adjacent tracks.

ENR summarized replacement of the 1896 rail bridge – “The $52.1-million bridge replacement and construction project took place in the middle of one of the busiest rail and highway corridors in the Northeast, all the while maintaining daily rail service for 125,000 commuters on 350 trains a day during the two-year project”.

The new bridge added additional travel lanes to increase road-way capacity. To speed construction, a self-propelled modular transporter installed six prefabricated bridge sections.

The Solutions Unearthed

Client: AECOM/CONNDOT

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