WTC MTA E-Line Connectors
Location:
New York, NY
Client:
Tishman Construction Company
Contract Value:
$18.9 Million
Project Dates:
2016 to 2018
- Temporary shoring and bracing (SOE)
- Demolition / Excavation
- Formwork and concrete work
- Waterproofing
- Steel modifications
- Backfill
- Site restoration (stonework, bollards, paving, sidewalk, utilities, carpentry & plumbing)
PROJECT OVERVIEW
There are three pedestrian connector tunnels at the World Trade Center which were constructed at three separate locations to connect Tower 2 to the E-Train, and the E-Train to the R-Train (North and South E-R locations). Work consisted of temporary shoring and bracing (SOE), demolition of existing Port Authority slurry wall and MTA 100+ year old subway tunnel structures. Posillico completed the general excavation, formwork for new concrete structures and completed all concrete work associated with the tunnel slab, walls, roof slab and waterproofing as per plans. The project also included miscellaneous steel modifications, backfill and restoration of the site. The restoration included completion of the new WTC plaza granite stonework along with the installation of security bollards, paving and sidewalk work. Lastly, Posillico installed all finishes to open four of the MTA owned connectors, including carpentry, plumbing, electrical, communication, as well as fire alarm and sprinkler systems to accommodate the new spaces.
WHAT MADE THIS JOB COMPLEX
The jobsite was located on the World Trade Center site, which made for complicated logistics tied to SWAC Approval Process and Site Security. The connector tunnels interfaced with both PANYNJ and MTA NYCT adjoining property which required diligent inter-agency coordination. Night work and track outages were necessary to perform the utility tie-ins for the connectors. Posillico was only provided one work train by the MTA for the duration of the contract, so most of the materials were all brought into and out of the connectors by hand during a night shift. Lastly, the tight schedule was only made more challenging by the numerous existing underground utilities conflicting with the new connector tunnel.
HOW POSILLICO SOLVED IT
Posillico was able to complete the work successfully by demonstrating a tremendous amount of coordination with all stakeholders (PANYNJ, MTA, Silverstein Properties, Tishman Construction, PAPD, subcontractors) and well-planned operations including weekly coordination meetings with all stakeholders mentioned. Thorough communication with WTC Vehicle Security and SWAC personnel helped streamline the security process and ensure efficiency. Lastly, Posillico addressed some of the technical challenges by designing and fabricating an engineered temporary support system utilizing structural steel and jacking system which was installed before wire saw cutting and demolishing existing structures.
