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At the time of its demolition, the bridge was the oldest cantilever bridge in the United States still in use as well as the oldest Scherzer Rolling Lift under the supervision of the Massachusetts Department of Public Works. Streetcar tracks originally ran across the bridge. [1] This bridge closed for several months for repairs on 15 December 2008.
The rolling lift trunnion (sometimes a "Scherzer" rolling lift), raises the span by rolling on a track resembling a rocking-chair base. The "Scherzer" rolling lift is a refinement patented in 1893 by American engineer William Donald Scherzer. [3] The rarer Rall type combines rolling lift with longitudinal motion on trunnions when opening. [4]
This design has been pioneered by the structural engineer Santiago Calatrava in 1992 with the Puente del Alamillo in Seville, Spain. In two of his designs the force distribution does not depend solely upon the cantilever action of the spar (pylon); the angle of the spar away from the bridge and the weight distribution in the spar serve to ...
This subtype should not be confused with an asymmetrical single tower cable-stayed bridge, which possesses a single tower on one side of the gap to be crossed (see Rama VIII Bridge), nor with the cantilever spar cable-stayed bridge, which has span supporting cables on only one side of the tower along the direction of the roadbed.
A cantilever bridge is a bridge built using structures that project horizontally into space, supported on only one end (called cantilevers).For small footbridges, the cantilevers may be simple beams; however, large cantilever bridges designed to handle road or rail traffic use trusses built from structural steel, or box girders built from prestressed concrete.
Plans for the bridge were shifted in 1964, and it ultimately became a secondary span that would simply relieve congestion on the Grace bridge. A reversible lane was added to its design by 1965. The US$15 million bridge opened to traffic on April 29, 1966. The ribbon-cutting ceremony was attended by 500 people. [12]