I came across this video that introduces DAT Instruments, an Italian Company that builds dataloggers for geotechnical construction such as grouting, jet grouting, soil mixing, diaphragm walls and more.
Tunnel Boring Magazine has this synopsis of the project: The East Side Access project in New York City involves some of the most complex civil construction in recent years. The project involves constructing new tunnels […]
PITTSBURGH, PA – January 18, 2010 – Nicholson was recently awarded a subcontract by E.E. Cruz and Tully Construction Co., a Joint Venture that includes approximately 200,000 SF of diaphragm walls for the construction of the 96th Street station box as part of New York City’s Second Avenue Subway project. Nicholson’s contract also includes jet grouting for a subgrade strut, water cutoff, and temporary support of excavation; compensation grouting for two buildings at excavations for ancillary structures; micropiles within an existing building; and curtain grouting in rock. The project owner is the Metropolitan Transit Authority. [Editor] Click through for the entire press release from GeoPrac.net sponsor Nicholson Construction. [/Editor] […]
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)
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Instrumentation systems for geotechnical and structural monitoring often entail monitoring large numbers of sensors of different types with dataloggers often being installed in remote, inaccessible and hostile locations.