WTC Construction Update, November 2012Nov 15, 2012
4 World Trade Center
Structural steel is now topped out at the 72nd floor, with only upper mechanical and roof bulkhead construction left. Elevators continue to be installed at shafts up to the 50th floor with separator beam pockets being filled with high strength grout. Concrete and core walls are complete up to the 65th floor, as are column encasements. The temporary diagonal bracings have been removed up to the 60th floor and the curtain wall installation, which began in late April 2011, has reached the 63rd floor. Both the below-grade mechanical work and the fireproofing and masonry work are advancing.
3 World Trade Center
Concrete placements for above grade decks are proceeding. Steel columns are being extended from the 6th to the 7th floor with spray-fire proofing operations beginning on the 2nd floor. Installations of mechanical, electrical, plumbing, fire protection utilities and CMU walls are continuing on all below grade levels. Three tower cranes are now active on site: two for steel erection and one for concrete operations. The tower’s lower podium reached its full seven-story height in November 2012. Fabrication of curtain wall panels has also begun in facilities in Connecticut, Canada, and Italy.
2 World Trade Center
Current work at 2 World Trade Center includes completing the street level superstructure steel and concrete. Installation of the building mechanical systems continues throughout the B1-B4 basement levels. Installations of mesh rebar for the east and north sidewalks have commenced, and elevator divider beams are being installed in the center core on B1. Low voltage raceways, conduits and cables are currently being installed and steel and concrete deliveries continue to arrive inside the Vesey Street entrance. The building is expected to be completed to street level by December 2012.
1 World Trade Center
Under the Port Authority’s supervision, tower steel has topped out at the 105th floor with the fitting of the glass curtain wall above the 88th floor and concrete floors poured above the 104th floor. Core shear walls topped out in October 2012 with the final concrete placement extending walls to the 104th floor mezzanine. The elevator landings, stairs and related structural elements is now completed to the 102nd floor mezzanine. All trusses for the east lobby escalators are set in position and the installation of escalators 1-7 are in progress at the east lobby areas between the B2 and ground floor levels. The installation of the 408-foot-tall telecommunications spire is expected to begin in late November 2012 and reach its full height, 1776 feet, in March 2013.
World Trade Center Transportation Hub
Steel erection for the Transportation Hub oculus substructure has begun as has construction connecting to the Vehicular Security Center. Steel and concrete has been placed underneath the 1 subway line along the Greenwich Street corridor. Preparations are being made for the installation of the east arch truss. The steel installation for the oculus superstructure is set to begin in November 2012. The Transportation Hub construction contract was awarded to Skanska in summer 2010. Construction of the West Street pedestrian underpass (the “east-west connector”) , linking the World Trade Center with Battery Park City’s World Financial Center, is now active on the west side of the WTC site ( just south of 1 WTC and across West Street). The east-west connector structural components are being installed across West Street.
National September 11 Memorial and Museum at the World Trade Center
The National September 11 Museum is in the midst of interior fit-out and artifact installation in the underground space with the opening date TBA. Within the Pavilion, electrical contractors are installing buss ducts and working on wire terminations on the 3rd floor, while carpenters are installing black iron and framing on the 1st floor’s walls and ceiling. In the Memorial Museum, the plumbing contractors have begun installing trolley beams in the north mechanical room and electrical contractors are working on lighting controls, the electric feed for passenger elevators . With more than 225 trees now on site, more soil installation and tree planting is underway and will continue in phases through 2013. The Memorial reflecting pools and waterfalls were commissioned in late August 2011 with the bronze nameplate installation completed in June 2011. The “Survivors Stairway” was relocated to its permanent home in the underground Memorial in December 2008 and the Slurry wall reinforcement was completed in spring 2009. 75% of the Memorial Plaza opened on September 11, 2011 and has hosted over 4.5 million visitors to date.
World Trade Center Vehicular Security Center
Structural steel in the Vehicular Security Center is substantially complete with over 9,000 tons erected to date. Concrete work is now progressing with more than 9,700 cubic yards of concrete poured- about 34% of the total. The Main sprinkler pipe installation has been initiated in the Sub-Basement and Bus Parking Levels as part of the MEP work, Phase I. Hot water and chilled water line installations have begun on the Bus Parking level as well. MEP work continues on to Phase II as the contractors are performing deck layout of conduit and sleeves on the street levels, and installation of conduit on the Bus Parking Level.