Laser displacement sensor on bridge pier

Project Scheduled upgrades for this six-lane highway bridge include replacement of fender systems and improvement of scour protection. The bridge must remain open during construction. Monitoring Requirements The project will require vibration monitoring and stability monitoring. The photo above shows heavy stone mattresses being placed at the base of the piers for scour protection. Implementation…

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Prism at Tampa Airport

Project Tampa International Airport’s $2 billion expansion plan will allow the airport to serve a projected 34 million passengers per year, up from the current 21 million. Photo was taken from the tower.   Monitoring Requirement Keller is installing foundations for three new structures at the airport. Existing structures had to be monitored for vibration…

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Monitoring Railroad Tracks

Project The California High Speed Rail system will connect San Francisco to Los Angeles with trains traveling up to 220 mph on grade-separated track. (Rendering courtesy of California High Speed Rail Authority). GEO-Instruments is at work on a section of the project between Fresno and Bakersfield. The elevated tracks will be supported by large-bore piles.…

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Prado Flood Basin

Project The USACE enlarging the flood control basin and building a dike to enhance flood risk management at Prado Dam. The basin is designed to accomodate a 200-year event. Monitoring Requirement Engineers needed to monitor settlement, total pressure, and pore-water pressures. Implementation GEO installed a wireless, solar-powered logger, three settlement cells, an earth-pressure cell, and…

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Monitoring rail and metro tracks

GEO’s AMTS is monitoring Caltrain track during adjacent construction. The dots of light are prisms installed on the track. Rail clip prisms are installed in pairs at 15-foot intervals along the track. This photo shows only the inside prisms. Pairs of road prisms at the road crossing. Monitoring prism pairs provides measurements of track geometry,…

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Project An expansion project at Denver International Airport will add 39 gates to the existing terminals, increasing capacity by 30%. Monitoring Requirement Existing structures must be monitored for movement as excavation and construction takes place. GEO was contracted to monitor four structural columns on Terminal C, which is undergoing a 16-gate expansion. Implementation GEO-Instruments installed…

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Mokulumne Seismic Retrofit

The Project The Mokelumne Aqueduct, some 87 miles long, consists of three large-diameter pipes,constructed in 1929, 1949, and 1963. The aqueduct carries water from the Sierra Nevada foothills to the East Bay Area, providing nearly 80% of the area’s water supply. The Requirement The aqueduct underwent a seismic retrofit of support bents, expansion joints, and…

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Infrastructure Monitoring

Seattle, WA GEO monitored Sound Transit assets and an SPU water line during ground improvement work on an adjacent property. Instrumentation included automated vibration monitors for the water line and an AMTS system to monitor the Sound Transit assets.

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Monitoring Structures above Tunnel

Baltimore, MD GEO monitored an existing train tunnel as work proceeded on a new sewer tunnel. The AMTS in the photo was monitoring surface points, while another AMTS was monitoring within the tunnel. Other instrumentation included shape arrays, piezometers, extensometers, and automated vibration monitors.

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Settlement and Tunnelling

Bellevue Tunnel, WA.  The Bellevue tunnel was aligned with a major thoroughfare. To monitor possible settlements, GEO-Instruments installed borehole extensometers above the tunnel centerline and  arrays of road prisms across the road. Photo shows installation of a road prism. Borehole extensometers were terminated flush with the surface and LidLink antennas transmitted measurements to a GeoCloud…

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