GEOPROJECT_Middlebury Monitoring

Middlebury Monitoring Phase 1-3
Construction Inspection & Monitoring

Automated alerts to essential personnel if instruments reached predetermined limit level compromising adjacent historical structures

Remote adjusting trigger levels reduced need for trips to project site, saving client time and money

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The Challenge

Replace old rail bridges with a tunnel
Historical structures located nearby that could become damaged during construction

The Vermont Agency of Transportation (VTrans) in collaboration with the Town of Middlebury replaced two almost 100-year old rail bridges with a tunnel. The two bridges were about 300 ft apart and were disassembled and removed as the tunnel excavation took place. The project was in busy downtown Middlebury, VT with many local businesses and historical structures located nearby. Replacing the rail bridges with a tunnel changed the town landscape by overlaying the depressed, walled rail bed that cuts through the town with green space connecting with other existing green space.

The Solution

Geocomp worked as a sub consultant for Kubricky Construction Corp throughout all three phases of the Middlebury Bridge and Rail Project. Phase III of the project included twenty six preconstruction surveys for historical properties deemed as sensitive by Vermont DOT. Many of these properties were also being monitored for potential deformation and vibration effects. Eight vibration monitors were installed to monitor vibrations due to construction activities at the most sensitive structures, located adjacent to the project site. Air overpressure microphones were also included with the vibration monitors.

The blasting operations were monitored remotely in real-time by Geocomp personnel using our iSiteCentral® data management system. If the vibration or air overpressure limit levels were reached, notifications were sent to all essential personnel via iSiteCentral®. Over 100 survey prisms were installed on the structures closest to the project site and the temporary support of excavation system. Three automated total stations were used to periodically take readings on each of the survey monitoring points and report changes in real-time.

Services Provided

Preconstruction Surveys

Twenty six preconstruction surveys for historical properties deemed as sensitive

Data Management

Data management for sensor limit levels sending real-time notifications via iSiteCentral®

Vibration Monitoring

Vibration monitoring to adjacent structures during active construction and air overpressure microphones

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