bridges
Spokane River Bridge
Spokane River Bridge The BNSF Spokane River Bridge project involves construction of a new rail bridge adjacent to the existing bridge. Geo-Instruments is monitoring the existing bridge for potential impacts from the construction, which includes vibratory pile driving for a temporary pile-supported work trestle. GEO deployed three automated monitoring systems that separately report displacements, vibration,…
Read More6th Street Viaduct
6th Street Viaduct GEO-Instruments worked with Skanska and Cowi during the construction of the new multi-arch 6th Street Viaduct in Los Angeles. The 3500-foot long viaduct crosses over 16 lanes of highway, 18 sets of railroad tracks, the LA river, parks, buildings, and sidestreets. The bridge deck was initially supported by formwork. After the arches…
Read MoreCrossbay Bridge Upgrade
Crossbay Bridge Upgrade ProjectScheduled 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 RequirementsThe 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.…
Read MorePedestrian Bridge
Ballston Pedestrian Bridge The Project The redevelopment plan for Ballston Quarter, the commercial center of Arlington, Virginia, included a new pedestrian bridge, shown in a conceptual drawing above. The new bridge superstructure was fabricated off site, then transported to the location as shown above, and finally lifted onto prepared piers, as shown in the next…
Read MoreMerchants Bridge
Merchants Bridge Renovation 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…
Read MoreBridge Stability
Bridge Stability A monitoring system was needed before Keller could perform compaction grouting to stabilize the abutments for this highway bridge in New Jersey. GEO-Instruments installed a fully-automated, solar-powered, wireless system in just a day. GeoCloud laser distance meters (circled) are installed below the bridge deck. These monitor for any convergence due to the grouting…
Read MoreMerrimack Bridge
Merrimack Bridge 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 and transmitted…
Read MoreHernando de Soto Bridge
Hernando de Soto Bridge Project Overview The Hernando de Soto bridge, first opened in 1973, carries I-40 traffic across the Mississippi river. During a seismic retrofit, sudden settlement of a pier supporting an approach bridge, forced temporary closure. The pier had settled 5 inches in three days. After evaluating the failure, engineers revised construction methods…
Read MoreHines Bridge
Hines Bridge Overview In November 2008, a heavily loaded barge battling strong currents collided with a bridge pier. The collision damaged the pier and caused misalignment of the swing span, which would no longer close properly. Safety concerns forced the Massachusetts Highway Engineers to close the bridge to traffic. The engineers then designed a series…
Read MoreBear Mountain Bridge
Bear Mountain Bridge Project Overview Bridge engineers added “helper” strands on this 1924 suspension bridge to counter load shedding by the main suspension cables. GEO-Instruments installed special strain gauges on the helper strands and anchors. These would be used to monitor the performance of the helper strands and to detect any further load shedding of…
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