Tunnel Business Magazine

JUN 2018

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4 2 T U N N E L U P D A T E S TUNNELINGONLINE.COM TBM: TUNNEL BUSINESS MAGAZINE // JUNE 2018 Other parties affiliated with the project – Tunnel Designer for the Contr Consultant: Ar er: Her- renkecht. Preliminary design was completed by CP o per- forming design services during construction. Key Project Personnel – o Project Ex- ecutives: Gary Baker, Proje Harrington, Engine t An- o Design ill Hansmire, Tunnel D o Construction cadis), Ron Drake, Technical Advisor/Tunnel Resident Engineer; Contractor Project Executives (Regional Con- nector Contractors RCC): (Skanska) e Apari- e Smithson; (Tray agard. Redwood City Gravity Pipeline Project Barnard Bessac JV (BBJV) Silicon Valley Clean Water's (SVCW's) ex- isting force main sewer system was construct- ed more than 45 years ago and was designed to last between 25-50 years. Additionally, due to significant population growth in the San Francisco Bay service area, the system experi- ences roughly three times more pressure than it was designed for. Over the past four years, failures in the system have led to the leaking of raw sewage. Barnard, joint venture partner, Bessac, and design engineer, Arup, are working with SVCW on a nearly $8 million progres- sive design-build preconstruction contract to advance the design of the Gravity Pipeline Project. This new pipeline will provide tempo- rary stormwater storage, and stormwater and sewer conveyance to SVCW's existing Waste- water Treatment Plant. SVCW has split the contract into two stages. Stage 1 requires investigation, surveying, cost and schedule estimating for multiple options, and coordination with a separate design-build contractor who is working concurrently on the site. Beginning with a partnering workshop, BBJV quickly co-located with SVCW last fall to advance the project design from the 10 percent stage to 60 percent. The design scope includes support of excavation (SOE) for the tunnel bor- ing machine launch shaft; SOE for two retrieval shafts; 3 miles of gravity sewer pipeline tunnel; and all inlets, drop structures, and connections to the tunnel, including full hydraulics design. The pipeline, to be con- structed by earth pressure balanc methods, will improve the wastewater convey- ance system that eventually discharges into the San Francisco Bay. Once design for this stage is complete, BBJV will prepare to negotiate pricing for Stage 2, which will consist of the remaining design ser- vices to bring the design from 60 percent to 100 percent, along with all required gravity pipe- line shaft and tunnel construction. The BBJV Team and designer Arup continue to make design progress on the SVCW Gravity Pipeline Project. Daily collaboration and coor- dination with SVCW, owner advisors, front of plant contractor, and community stakeholders have paved the way to the start of good rela- tionships between all involved. With the recent completion of ground in- vestigation work and lab testing, Arup has completed the geotechnical data report (GDR). Preparation of the geotechnical baseline report (GBR) will be the next focus. Arup also com- pleted the basis of design report for the airport access shaft, which will b location for both tunnel drives. BBJV identified early the need to increase the shaft diameter from 35 ft (SVCW's plan) to a larger 58-ft. diameter shaft to eliminate site congestion and support improve cava- tion production rates. Additionally, Arup com- pleted the retrieval shaft 60 percent design, which is now configured with a "dog-bone" geometry that consists of a 36-ft diametershaft, O n - D e m a n d We b i n a r 2018 Webinar Watch this FREE Webinar today! Visit tunnelingonline.com/webinars Remote-Controlled Demolition Robots Offer New Approach to Worker Safety and Productivity in Tunneling Applications Presented by Produced by The newest U.S. federal infrastructure bill plans to allocate $1.5 trillion for repairing and upgrading America's infrastructure. With significant funding on the horizon, tunneling projects are likely to increase. More than ever, contractors who embrace and adopt innovative approaches to enhance safety and improve productivity will succeed in meeting tight project deadlines and boosting profits. In this free webinar, industry expert Peter Bigwood will explain how remote- controlled equipment boosts productivity and increases safety for tunneling personnel. If you're in the tunneling business and looking for faster and safer methods of completing your work, there is no better time than now to learn about the many benefits provided by remote-controlled demolition machines.

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