AMTS monitoring track at Redwood City

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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Mokulumne Seismic Retrofit

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 aqueduct underwent a seismic retrofit of support bents, expansion joints, and temperature anchors. At this…

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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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Tunnel Monitoring

Bethesda, MD GEO monitored a WMATA tunnel structure with strain gages, convergence gauges, tiltmeters, vibration monitors, and AMTS. The AMTS and prisms are clearly visible in the photo on the right. Also visible is one of the eight vibration monitors and wall-mounted geophones.

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Wireless Logger - in street installation for Piezometer

Bellevue Tunnel Piezometers GEO engineer sets a wireless datalogger to transmit hourly readings of a piezometer. Automation improves safety for technicians and eliminates traffic disruptions. Piezometers were installed along the tunnel alignment collocated with observation wells and inclinometers at 10 locations. All were automated with dataloggers and wireless communications. Readings were displayed on a dedicated…

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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. The GeoCloud server provided…

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Elliot Bay Seawall

Seattle, WA Monitoring construction of Elliot Bay Seawall. This multi-year automated monitoring project included SAA shape arrays, tiltmeters, load cells, solar-charged, wireless loggers, and web-based reporting.

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Slope Monitoring

Snoqualmie Pass, Washington Rockslides and snow avalanches at Snoqualmie pass have caused frequent closures of I-90, so State and Federal agencies embarked on an improvement project. GEO provided automated monitoring for the project. These photos show a section of the project where GEO installed 22 instrumented rock dowels on very steep slopes. An AMTS system…

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