projects
Church Renovation
Church Renovation GEO installed instrumentation to monitor the stability of the church structure during renovation work. An Automated total station (AMTS) monitored for any displacements of the walls. GeoCloud wireless tiltmeters were also installed at critical locations to monitor rotational displacements.
Read MoreSlope Monitoring
Slope Monitoring at Snoqualmie Pass Project Rockslides and snow avalanches at Snoqualmie pass have caused frequent closures of I-90, so State and Federal agencies embarked on an avalanche bypass project. Monitoring Requirements WSDOT needed instrumentation for steep slopes directly above a work area. GEO installed 22 instrumented rock dowels. An AMTS system was also installed.…
Read MoreAqueduct Retrofit
Aqueduct Retrofit The ProjectThe 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 RequirementThe aqueduct underwent a seismic retrofit of support bents, expansion joints, and…
Read MoreSister Bars & O-Cell
Sister Bars & O-Cells GEO supplied and installed these sisterbar strain gauges to monitor an axial pile load test for large-bore piles. The strain measurements are used to calculate shaft load during O-cell testing. In a typical test, the O-cell is welded between upper and lower reinforcement cages. Gauges are attached to both. Careful preparation is required…
Read MoreLight Rail & Utilities
Light Rail & Utilities Project GEO monitored Sound Transit assets and an SPU water line during ground improvement work on an adjacent property. Instrumentation Instrumentation included automated vibration monitors for the water line and an AMTS system to monitor the Sound Transit assets.
Read MoreRetaining Wall
Retaining Wall Stability Project Requirements This 40-foot retaining wall is situated above a public parking lot. The area sees occasional heavy rains, so early warning of potential deformation of the wall was required. The client requested a non-intrusive, long-term monitoring system. Solution GEO installed a wireless node-and-gateway network of tiltmeters on the wall. These advanced tiltmeters have…
Read MoreRenovation of Apple Store
Renovation of Apple Store GEO deployed wireless data loggers, strain gauges, and an AMTS system. GEO monitored renovation work at the iconic glass cube Apple store in New York City. A critical phase of the renovation was the controlled release of tension in a pretensioned steel structure. Instrumentation included vibrating wire strain gauges to monitor the…
Read MoreBulkhead Stability
Bulkhead Stabilty GEO monitored a bulkhead along Harlem River in advance of construction of piers for a new bridge. Instrumentation included an AMTS monitoring system and automated vibration monitors.
Read MoreTunnels & Structures
Tunnel Construction & Surface Points 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.
Read MoreTunnelling & Settlement
Tunneling & Settlement Monitoring 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 using a LidLink antenna. Measurements were transmitted…
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