Ashmont MBTA Station (S45CN02)
Location: Boston, Massachusetts
Contract Value: $53,179,769
Project Dates: Spring 2010
Ashmont Station is an intermodal station serving the Red Line subway, the Mattapan Trolley and buses. The project called for the complete reconstruction and modernization of the station integrating all three transit modes.
Station work included complete demolition of the existing structure and reconstruction of the new station while maintaining train service to and through the station. Construction of the new station included installation of Drilled Shaft Foundations, Cast-In-Place Concrete walls and floors, Cast-In-Place Concrete Platforms, Precast Concrete Planks and Box Beams, Precast Concrete Columns, Architecturally Exposed Structural Steel, and installation of new communications and signal systems.
Modifications to the traction power system, installation of new direct fixation track tied into the ballasted trackwork, and construction of a 700lf cast-in-place concrete viaduct to carry the high-speed trolley over the active transit tracks was completed and a new Overhead “Catenary” Contact System was installed in conjunction with the viaduct construction.
The work included the complete reconstruction of the loop track viaduct. Barletta constructed the cast-in-place concrete viaduct to carry the high-speed trolley over the active transit tracks.
Station work included complete demolition of the existing structure and reconstruction of the new station while maintaining train service to and through the station. Construction included CIP concrete walls and floors, CIP platforms, precast concrete planks and box beams, and precast concrete columns.
Work was performed while the tracks remained in service, on weekend shutdowns and at night during non-revenue service hours.
These intense weekend operations required thorough risk assessment and constant coordination with all involved departments of the MBTA, including Construction, Operations, Power, Signal and Communications.
The contract allotted 22 weekend shutdowns, but Barletta was able to complete the required work in 8 weekend shutdowns and never missed a Monday 5:00am deadline.