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Bridge structures in many countries around the world have used GEOKON sensors for measuring key parameters such as straindisplacement, force, temperatureinclination, alignment and settlement. Sensors are installed permanently for long-term health monitoring, temporarily for load testing and/or to ensure safe working conditions during repair or strengthening. Internet-accessible data acquisition systems ensure that any significant change in the condition or behavior of the structure is log

ged, reported and efficiently monitored.

Jeremiah Morrow Bridge

In 2009, the Ohio Department of Transportation initiated the replacement of the twin steel truss Jeremiah Morrow Bridges, located along Interstate 71 between Columbus and Cincinnati Ohio. The new bridges are currently under construction and are post-tensioned cast-in-place segmental concrete box girders on concrete piers, which range from 89 ft to 194 ft in overall height. The longest span of the twin structures is 440 ft with a total length of 2,235 ft, and each bridge has a 52 ft wide roadway carrying 3 lanes of traffic.

Construction control, to ensure correct alignment and corresponding jacking forces, was realized using measurements from a series of vibrating wire tiltmeters, which were mounted on the piers and connected to a data acquisition system. Measurements using traditional laser survey techniques were also incorporated.

For additional information, please contact: Victor Hunt | University of Cincinnati Infrastructure Institute

Kao Ping Bridge

The new Kao Ping Bridge is one of the longest (510 m) and the highest (183.5 m) bridges in Asia. Construction of the bridge began in February 1997 and ended in February 2000. Instrumentation included Strain Gages in the concrete and steel segments.

For additional information, please contact:

David Chang | Davisson-Geokon Industrial Co. Ltd.

Marbella Relief Road Viaduct

In 1997, a landslide occurred in Malaga, Spain, which caused the piers of the Marbella Relief Road Viaduct to tilt. To monitor the ongoing safety of the viaduct, eight vibrating wire Biaxial Tiltmeters were installed at the base of each pier.

For additional information, please contact:

Javier Andreu | Ingeneria de Instrumentacion Y Control

Point Marion Bridge

A new bridge is being built 20 m south of the historic Point Marion Bridge, which will be replaced due to its structural deficiencies.

The soft nature of the surrounding foundation soils prompted a geotechnical / structural instrumentation program to monitor the impact of new bridge construction on the aging structure. Automated measurements were taken of 19 Vibrating Wire Piezometers to monitor water pressures in the foundation soils on both sides of the river. In addition, a Vibrating Wire Piezometerwas used to record river water levels, and two Vibrating Wire Strain Gages were used to monitor the old bridge. Manual measurements were taken of Tilt Plates, settlement pins (placed in the fill) and Inclinometers installed in the foundation soils.

Data were automatically collected and imported into an MultiLoggerDB database on an hourly basis. MLWebsoftware was then used to provide the construction contractor and owner with access to data via the Internet.

For additional information, please view the Canary Systems Project Profile