Geotechnical Support for Route 80 Bridge

Project Highlights

  • Construction Observation
  • Geotechnical Engineering
  • Bridge Installed With No Damage to Water Main

Geotechnical Support Helps to Safeguard Crucial Water Main

South Central Connecticut Regional Water Authority (RWA) owns and maintains a 48-inch-diameter water main which crosses the Farm River adjacent to the Connecticut Department of Transportation (CTDOT) Route 80 bridge in North Branford, Connecticut. Tighe & Bond provided engineering services to RWA prior to and during the construction of a replacement Route 80 bridge. Tighe & Bond evaluated potential impacts that construction-induced vibrations might have on the water main pipe and support bridge and developed instrumentation and monitoring recommendations, which included a program of crack gauges, survey monitoring points, tilt meters, and seismographs.

Tighe & Bond prepared a monitoring special provisions section for inclusion in CTDOT’s contract documents. Tighe & Bond reviewed contractor submittals relating to excavation support, dewatering, and monitoring, and provided construction observation during installation of deep foundations for the replacement bridge to ensure compliance with construction documents.

The CTDOT bridge was installed without damage to RWA’s watermain pipe or support bridge or interruption to service. The monitoring program provided real-time feedback during construction to evaluate the contractor’s means and methods and make any necessary changes to avoid damage to RWA’s property.

Services Snapshot

Tighe & Bond provided geotechnical services to the Regional Water Authority prior to and during the construction of the replacement Route 80 Bridge. Tighe & Bond also provided construction observation and provided regular feedback to RWA throughout the replacement of the bridge.

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