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World Trade Center construction reaches 20th floor

Steel installation for One World Trade Center has reached the 20th floor equivalent level, raising the tower to 60m above street level, the Port Authority of New York has announced.

The agency’s commissioners were given an update on the project yesterday. Commissioners were told that steel has risen to the 20th floor equivalent level. 

To reach the 20th floor, the Port Authority’s steel contractor, DCM Erectors, has already erected nearly 8,000t of structural steel - 700t more than the total amount of steel in the entire Eiffel Tower.

Currently, steel erectors are installing 16 giant steel nodes on the 20th floor level. Some of the nodes are as heavy as 175t and as high as three floors.

These giant pieces act as joints between the steel framing for the building’s podium and the steel for the remainder of the tower, and represent one of the signature elements of the building’s unique design and appearance.

The above-ground height is in addition to the 290m, or four floors, of the building below street level, which will contain mechanical space, fuel storage, water tanks, parking, retail and a lobby for the observation deck elevators.

Since construction began, more than 45,000m³ of concrete has been poured for the tower, both above and below ground, almost as much concrete as was used to build the entire Empire State Building.

The initial 20 floors of the tower consist of a lobby and several floors for M&E plant, which required more complex construction due to security and the configuration of the floors. The next 69 floors will be standard office floors and will be built at a quicker rate. The tower is scheduled for completion in 2013.

Port authority chairman Anthony Coscia said: “The construction progress on One World Trade Center is great news, but we know more challenges lie ahead.  The Port Authority will confront these challenges head-on as we continue with the rebuilding of the site.”

Port authority executive director Chris Ward added that the momentum must be maintained. “This progress is one more sign that the site is not a pit anymore. At the same time, we must continue working aggressively each day to keep up the momentum,” he said.

At the meeting, the Board also authorised:

  • an additional $4M (£2.5M) for design and redevelopment coordination efforts at the site until March 2011
  • additional planning funds for the design of the Vehicle Security Center. Work will provide for design development to help mitigate the impact of the delay in the deconstruction of 130 Liberty Street and advance the design of the basement structure.
  • Additional planning for the design of the Eastside Tour Bus Parking Facility
  • A supplement to an existing contract with DCM Erectors Inc., to complete site preparation work for the build-out of the WTC Transportation Hub’s steel superstructure
  • The award if a construction trade contract with Island International Industries for the spray-on fireproofing work at One World Trade Center.
  • The award of a construction trade contract with American Architectural for the cable net walls and canopies work at One World Trade Center.


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