projects
Elliot Bay Seawall
Elliot Bay Seawall Project Monitoring construction of Elliot Bay Seawall. Instrumentation This multi-year automated monitoring project included SAA shape arrays, tiltmeters, load cells, solar-charged, wireless loggers, and web-based reporting.
Read MoreRosslyn Metro Station
Rosslyn Metro Station Project Overview Construction of twin residential and commercial towers adjacent to the Rosslyn metro station involved demolition of an entire block of existing buildings, blasting and excavation for deep foundations, and finally the construction of the towers. The station, ventilation shafts at each end of the station, a long escalator, and three…
Read MoreFDR Drive
FDR Drive Reconstruction Project Overview Significant deterioration of the pilings supporting this busy six-lane parkway threatened its stability. Because the highway carries over 150,000 vehicles daily, it had to remain open to traffic during reconstruction. To manage the risk, highway engineers contracted GEO-Instruments to implement a monitoring system with early-warning alarms. Enclosure for data Logger…
Read MoreTransbay Transit Center
Transbay Transit Center Project Overview Construction of the Transbay Transit Center required a massive support of excavation system that included a cement-deep-soil-mixed perimeter wall, four levels of cross-lot bracing, and two levels of tiebacks. Monitoring Requirements To minimize risk, project owners wanted continuous monitoring of some 250 points within the excavation area, including points on…
Read MoreMTA East Side Access
MTA East Side Access Project Overview New York’s East Side Access project is designed to bring the Long Island Rail Road from Queens to Grand Central Terminal in Manhattan. Because the project involves tunneling under high value real estate, designers specified that the route be closely monitored for possible settlements. Monitoring Challenges The selected locations…
Read MoreHernando de Soto Bridge
Hernando de Soto Bridge Project Overview The Hernando de Soto bridge, first opened in 1973, carries I-40 traffic across the Mississippi river. During a seismic retrofit, sudden settlement of a pier supporting an approach bridge, forced temporary closure. The pier had settled 5 inches in three days. After evaluating the failure, engineers revised construction methods…
Read MoreI-5 Undercrossing
I-5 Undercrossing for Sound Transit This wide-angle photo shows excavation of one of the four pits (left), a scan station (middle), and one of the 400-foot long retaining walls (background). Project Overview Sound Transit’s U-Link project extends the regional light-rail system from downtown Seattle to the University District, via a 3.5 mile tunnel. The most…
Read MoreOil Storage Tanks
Recommissed Oil Storage Tanks Project Before an an oil storage facility could recommission some retired tanks, plant engineers engineers had to address concerns about the pile foundations of these tanks. Specifically, they needed early warning of settlements or differential movement of the tank foundation as the tanks were filled. GEO-Instruments provided a real-time monitoring system…
Read MoreOld South Church
Old South Church Project Overview Old South Church is a national historic landmark in Boston. It was built in 1873 on a wooden pile foundation. In 2008, high pressure grouting operations on a nearby subway station caused some of the piles to shift and opened a 70-foot long vertical crack in the east wall of…
Read MorePier Stability
Pier Stability Project Overview Nearby dredging operations posed a potential risk to this pier at a container ship facility. To monitor the pier, GEO-Instruments provided weldments for the underwater load cells and a wireless, battery-powered logging system for data collection. The logging system was installed flush with the pavement of the pier to avoid obstructing…
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