PROGRESS UPDATES ON THE HAMPTON ROADS BRIDGE-TUNNEL PROJECT. The Tunnel Boring Machine (TBM) has finally arrived in 300+ parts and the tunnel is prepping for this beast. The TBM is longer than a football field. The price tag for the TBM alone is $101 million which includes construction, shipping, and assembly costs.
The TBM will launch from the South Island (Norfolk side), and bore (work) at a rate of about 50 feet per day until it reaches the layer of soil known as the Yorktown layer, approximately 50 feet below the current tunnels. The TBM excavates the tunnels with a circular cross-section through the soil. The process will take more than two years. Built specifically for the HRBT Expansion Project, the TBM will be a central component of the project.
3 янв 2022
