infrastructure
Bridge Stability
Bridge Stability A monitoring system was needed before Keller could perform compaction grouting to stabilize the abutments for this highway bridge in New Jersey. GEO-Instruments installed a fully-automated, solar-powered, wireless system in just a day. GeoCloud laser distance meters (circled) are installed below the bridge deck. These monitor for any convergence due to the grouting…
Read MoreMerrimack Bridge
Merrimack Bridge MassDOT rehabilitated the Merrimack River Bridge, strengthening the superstructure and mitigating scour around the bridge piers. GEO placed an automated total station (AMTS) on the nearby Comeau bridge to monitor the stability of the piers of the Merrimack bridge. The AMTS measures angles and distances to prisms installed on the piers and transmitted…
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 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 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…
Read MoreDulles Airport
Dulles Airport Work 2003 The Automated People Mover project at Dulles International airport involved nearly two miles of tunneling. Large excavations were required for stations at the main terminal and the three mid-field terminals. The station at the main terminal involved a 50-foot cut and extensive underpinning of the terminal. Monitoring Requirements Monitor support of…
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