The Twin Towers are known to the world for their tragic end on September 11, 2001. However geotechnical engineers also know that the foundation design and construction for these landmark structures was particularly complex and […]
The basement foundation and retaining walls of the World Trade Center, sometimes referred to as the bathtub, were the only portion of the structure that survived the collapse of the towers after the 9/11 terrorist attacks. […]
Hawthorne, NJ (December 1, 2012): The Deep Foundations Institute (DFI) presented the 2012 Outstanding Project Award (OPA) to the Port Authority of New York and New Jersey for the design and construction of the Route 9A Pedestrian Tunnel at the World Trade Center in New York City. The award was presented to Robert Yin of the Port Authority of New York and New Jersey at the Awards Banquet during DFI’s 37th Annual Conference on Deep Foundations in Houston.
[Editor] Read on for the rest of the press release from DFI. [/Editor]
Geotechnical contractor Moretrench (also a valued GeoPrac sponsor) was heavily involved in emergency pumping and dewatering efforts in New York City in the aftermath of super storm Sandy. Every piece of pumping equipment they had […]
In the foundation and basement excavation for the Vehicle Security Center at the World Trade Center cite, an 18th century cargo ship was discovered approximately 20- to 30-ft below street level. It was likely a […]
The only portions of the World Trade Center towers that survived the attack on 9/11 were the basement slurry walls, part of the original shoring and foundation system. The National September 11 Memorial and Museum at the World Trade Center that is currently under construction will preserve a portion of that wall making it the largest exhibit the museum will offer. The wall section displayed will be 62-ft by 64-ft.
The existing slurry walls are being incorporated into the foundation system of the new facility but not without some improvements. The are adding some kind of foundations improvements to stabilize the toe of the walls, the New York Times article calls them caissons, but I don’t know if its a tangent or secant wall or something else. They are also lining them with additional concrete and reinforcement in front of the walls along with additional tiebacks to stabilize them. In the portion of the wall that will be displayed, a counterfort wall will be constructed behind it and new tiebacks will be installed on the front. Work for the counterfort wall will be done by hand in order to avoid the existing tieback cables. All of the existing tiebacks will be left intact. Check out the NY Times article for a great graphic showing the system. (Illustration by New York Times)