MTA Henry Hudson Bridge Rehabilitation
New York, NY
AI is providing civil engineering services on this Design-Build project. The Henry Hudson Bridge, built in 1935, is a fixed steel arch bridge, doubled deck with a main span of 840 ft. and viaduct and approach structures on both sides of the arch span. Rehabilitation is necessary to ensure continued safe operation and extend the service life of the Henry Hudson Bridge due to the presence of Alkali-Silica Reaction (ASR). AI will develop roadway plans for excavation and restoration of Edsall and Palisade Avenues per NYCDOT requirements. Details will be prepared to support the Roadway Plans. Specifications will be developed, where necessary, to support the work in Edsall and Palisade Avenues.
MPT plans will be developed to meet the requirements of specification section 1550-DB of the Design-Build Division I document. The MPT plans will consider both vehicle and pedestrian travel on city streets and pedestrian traffic on park paths. Detour plans for park pedestrian paths will be developed to route park users around the construction area.
Drainage plans will be developed showing the temporary conditions during construction and the final conditions of the system upon completion of construction activities. A drainage design report will be prepared, discussing the temporary and final conditions of the system during and after construction. The report will include a design basis and calculations where necessary. A SWPPP containing the necessary best management practices for erosion prevention and sediment control will be prepared for the temporary conditions during construction. The SWPPP will also include restoration plans for affected areas.
The overall scope of work for this Design-Build contract entails design, fabrication, and installation of a structural system to provide an alternate load path to support the existing steel arch superstructure directly to the rock stratum below bypassing the existing concrete substructures. The structural system and attachment to the existing steel superstructure will be such that the full load in the existing structural members can be transferred to the structural system at a later date and must accommodate the manner of achieving that load transfer. The concrete bent pedestals and east/west pilasters of the Lower Level North Abutment shall be replaced in their entirety.
The Design-Builder is also required to design, implement, and operate a Structural Health Monitoring (SHM) system with various types of sensors and data collection protocols for monitoring the performance of various bridge elements of the arch and superstructure during as well as after construction.
- Highway Design
- MPT Plans
- Drainage Design
- Stormwater Design
- Utility Protection Plan
- Pavement Design