September 11, 2012

Construction of the World Trade Center

The project was developed by the Port Authority of New York and New Jersey, which hired architect Minoru Yamasaki who came up with the specific idea for twin towers. After extensive negotiations, the New Jersey and New York State governments, which oversee the Port Authority, agreed to support the World Trade Center project at the Radio Row site on the lower-west side of Manhattan. To make the agreement acceptable to New Jersey, the Port Authority agreed to take over the bankrupt Hudson & Manhattan Railroad (renamed as PATH), which brought commuters from New Jersey to the Lower Manhattan site.

The towers were designed as framed tube structures, which provided tenants with open floor plans, uninterrupted by columns or walls. This was accomplished using numerous closely spaced perimeter columns to provide much of the strength to the structure, along with gravity load shared with the core columns. The elevator system, which made use of sky lobbies and a system of express and local elevators, allowed substantial floor space to be freed up for use as office space by making the structural core smaller. The design and construction of the World Trade Center twin towers involved many other innovative techniques, such as the slurry wall for digging the foundation, and wind tunnel experiments. Construction of the World Trade Center's North Tower began in August 1968, and the South Tower in 1969. Extensive use of prefabricated components helped to speed up the construction process. The first tenants moved into the North Tower in December 1970 and into the South Tower in January 1972. Four other low-level buildings were constructed as part of the World Trade Center in the 1970s, and a seventh building was constructed in the mid-1980s.

World Trade Center's first 110-story tower is already up to 10th floor level above grade; excavation is almost complete

Tree columns are 51 ft long, weigh up to 51 tons

Crane lifts column atop fifth floor exterior columns

Ironworkers set a three-story high wall panel

Three-column wall panel is hoisted

Steel rises for north tower while south tower area is dug

Track Drill sockets rock through casing it drove previously

Architect's model for the proposed World Trade Center on the East River

South Tower and slurry wall "bathtub" under construction in 1969

World Trade Center under construction in 1971

(via Wikipedia &


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