In addition to excavating, the TBM also installs the segmented, precast concrete shoring system that lines the tunnel. The excavated earth is carried out via conveyor belt and transported back to the launch shaft where it is safely removed. The 144-inch cylindrical TBM excavates the earth with a rotating cutting wheel, while hydraulic cylinders continuously advance the machine forward. A machine that’s anything but boringįor the two largest tunnel segments, each approximately 1 mile in length, the team procured a highly specialized Earth Pressure Balance Tunnel Boring Machine (EPB TBM) from Herrenknecht located in Schwanau, Germany. This project will serve the community and support economic growth in north central Texas by bolstering much needed water delivery capabilities. Currently, TRWD and the City of Dallas Water Utilities provide water for over 4.1 million residents, and this project will help the state deliver 350 million additional gallons of raw water per day to north central Texas. Sundt, along with joint venture partner Traylor Bros., will construct these tunnels.Īccording to water experts interviewed for Texas Public Radio, the need for water in Texas is predicted to increase from 17.7 million acre-feet (in 2020) to 19.2 million acre-feet by 2070. Eventually, these five tunnels will house 12,360 feet of pipeline along with 31,000 linear feet of open cut 84-inch waterline for an integrated water delivery transmission system in the Dallas area. On a five-tunnel job like Long Tunnel Crossing for Tarrant Regional Water District (TRWD) in Texas, specialized equipment was needed to achieve the project scope without disturbing above-ground activities. Digging mile-long tunnels is no easy feat.
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