Tunnel Business Magazine

AUG 2017

TBM: Tunnel Business Magazine is the market leader for North America. TBM is written for leading professionals in all aspects of tunneling and covers project stories, design elements, contracting strategies, legal issues, new technology and more.

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The Blue Plains Tunnel contract was awarded for $330 million in 2011. Design build was new for the owner and for the contractor. "It was our underground division's first experience with design-build, so we definitely had to go through some growing pains, e Jatczak of Traylor Brothers. "One of things we learned early on was that there was not enough time in the schedule for design reviews, so we had to work in collaboration with the owner's engineers to develop the design packages." One of the benefits of the design-build approach became apparent on the construction of the Figure 8 launch shaft. Originally conceived as separate shafts connected by a 125-ft adit, the design-build team proposed construct- ing the shafts adjacent to each other to eliminate the cost and risk of con- structing an adit, acc ting the adit, however, complicated the design and required close coordination between the designer and contractor during construction. Further complicating the process was making sure that the design would meet the needs of a separate group within DC Water that would ultimately be operating the dewatering and screening facilities would ul- timately occupy the shafts. "Our shaft had to support follow-on internal loads, but all of the information was not available at bid time, so it was a challenging and dynamic process during construction," said Brett Zernich of Traylor Brothers. TUNNELINGONLINE.COM TBM: TUNNEL BUSINESS MAGAZINE // AUGUST 2017 C O V E R S T O R Y 16 (ABOVE) Crews lower the Herrenknecht TBM into the launch shaft. (LEFT) The Blue Plains Tunnel was completed on time and under budget, setting the tone for the future works. ( Photo by James Wonneberg. )

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