Proceedings of DFI-India 2019: 9th Conference on Deep Foundation Technologies for Infrastructure Development in India, (DFI)
Micropiles and Ground Anchors Increase the Capacity of Existing Bridge Abutments
Swetha Chennu, EIT, Anthony C. Barila, P.E., and John R. McKinnon
The existing Route 145 (Winthrop Avenue) bridge over the MBTA commuter rail line and the Pan-Am Railway was originally built in 1899. The superstructure was reconstructed in 1958. The combination of increased traffic which resulted in increased vertical loadings and unbalanced lateral loads, derating of its current capacity due to old age and deterioration plus new design standards required the replacement of the entire bridge. This bridge is located in the City of Revere, a few miles north of Boston, Massachusetts. The steel truss and bridge deck was supported directly on the existing abutments comprised of stacked granite block gravity walls. The abutments will remain after the existing bridge is removed and replaced. Photo 1 shows the existing bridge over the rail tracks. However, the granite block abutments needed to be “reinforced” to allow for the additional vertical and lateral loads to be supported in accordance with current highway and railroad standards.
|article #3309; publication #1059 (India2019)|