AVM at Seawall

Naples, a neighborhood of Long Beach, California, is built on three islands protected by seawalls. A project to refurbish the seawalls involved driving the steel sheet piles seen above. Driving sheet piles generates noise and vibration. To protect adjacent properties from excessive vibrations and to protect people from excessive noise, the contractor needed vibration monitors.…

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Solar Powered Dust Monitor

GEO deployed two dust monitors at this construction site in Miami, Florida. Why two? The contractor is responsible for controlling dust from the site, but there may be other sources of dust that are outside the contractor’s control. By deploying two monitors, one upwind and one downwind from site activities, it is possible to calculate…

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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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Ballston Pedestrian Bridge

Project Overview The redevelopment plan for Ballston Quarter, the commercial center of Arlington, Virginia, included a new pedestrian bridge, shown in a conceptual drawing above. Using a technique called accelerated bridge construction, the new bridge superstructure, was prefabricated off site, transported to the location, and then lifted onto prepared piers. The superstructure weighed approximately 100…

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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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TIP Thermal Wires in Cage

Thermal integrity profiling can identify necking, bulging, cage eccentricities, pile shape, and variations in concrete cover. Above: TIP cables before installation. GEO technician completing the installation of TIP cables and sister bar strain gauges on a two-part, 40 foot cage that will be tested with a bi-directional load cell from LTC. The first part of…

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Vibration monitoring in Hollywood

Vibration monitoring was required during utility work near the historic 1923 Hollywoodland entrance gate. GEO supplied four automated RVM (rugged vibration monitors) for the project. The RVM features a heavy steel enclosure suitable for unprotected public areas and a built-in, shatter-proof solar panel to eliminate the need for AC power.

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Hydrostatic Settlement Cells on warehouse wall

Seattle, WA This tilt-up constructed storage facility experienced settlement and movement of walls. Monitoring required 10 hydrostatic level cells to monitor settlements, 10 GeoCloud tiltmeters to monitor any outward rotation of the walls, and 3 vibrating-wire crackmeters with GeoCloud VW Nodes to monitor cracks in the wall. Measurements were transmitted off site by cellular modems to GeoCloud…

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Denver International Airport This AMTS is monitoring four structural columns on DIA Terminal C as excavation for an expansion takes place. Two L-bar prisms are installed on each column, one high and one low.

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