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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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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Merchants Bridge

Project Overview TRAA Merchants Bridge is a rail bridge that crosses the Mississippi River between St Louis Missouri and Venice, Illinois. First opened in 1889, the bridge is owned by the Terminal Railroad Association. It services six Class 1 railroad companies and Amtrak. In 2018, work began on an extensive renovation of the bridge. The $172M…

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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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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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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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Rosslyn-station-project

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 high-speed elevators were…

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