Tunnel Business Magazine

AUG 2018

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Skanska-Kiewit, one of three joint venture teams short-listed for the $3.6 billion Hampton Roads Bridge- Tunnel project, has pulled itself from consideration, according to the proj- ect owner, Virginia Department of Transportation (VDOT). Skanska- Kiewit decided to pursue other op- tions, project manager Jim Utterback told the Virginia-Pilot. The HRBT expansion construction will build a new four-lane bridge-tun- nel and widen the existing four-lane segments of I-64 between Settlers Landing and I-564, to ease congestion between Hampton and olk. The contract award is anticipated in early 2019 with project completion target- ed in 2024. The remaining short-listed teams are: 1. Hampton Roads Capacity Constructors Lead contractors: Fluor Enterprises Inc. / The Lane Construction Corp. / Traylor Bros. Inc. / Dragages Civil Works Virginia Inc. Lead designer: ech- nical Services Inc. Design support: Baker International / Royal HaskoningDHV and Witteveen+Bos Joint Venture ueser Rutledge Consulting Engineers 2. Hampton Roads Connector Partners Lead contractors: Dragados Grands Projets SAS / Dodin Campenon Bernard SAS Joint Venture Lead designer: I-64 Design Joint Venture (HDR Engineer- Design support: Whitman Requardt and Associates LLP / on Inc. / Pre ements Inc. / AI Engineers Inc. / GET Solu ttern & Craig / Athavale Lystad & Associates Inc./ Diversified Property Services Inc. Skanska-Kiewit Pulls Out of Running for Hampton Roads Bridge-Tunnel TUNNELINGONLINE.COM TBM: TUNNEL BUSINESS MAGAZINE // AUGUST 2018 B U S I N E S S B R I E F S 1 2 y 3, 2018 a 6.2-m (20.3-ft) di- ameter Robbins Crossov broke through into an underground chamber, marking the completion of the en tunnel in Albania. The erated by contractor Limak, was also the first Crossover machine to oper- ate in Europe, and bored through geol- ogy including ophiolite, sandstone, brec- cia and siltstone flysch. "The cutterhead and cutters have achieved outstanding performance," said Engin Gur or Li- ed rates as high as 648 m (2,126 ft) per month in April 2018, and as much as 37.4 m (122.7 ft) in one day. The Crossov encounter high-pressure water and was thus used in hard rock Double Shield mode throughout tunneling. erformed very well, as did a Robbins-supplied adit conveyor that operated in a 180-degree continu- ous curve. It was impressive, Walker, Robbins Field Service Superin- tendent. Several field service personnel remained onsite throughout operation ovide guidance and trouble-shooting. The machine was launche - vember 2016 following Onsite First Time Assembly (OFTA), which enabled the machine to be initially assembled at the jobsite. The crew ramped up production slowly over the next 230 m (755 ft). "Ground conditions were good and we did very few cutter changes — only 20 cutters were used during the bore," said Walker. Two-stage grouting was carried ou ored and lined the tunnel in three 8-hour shifts. "The personnel on this project have created a friendly work environment; they've made it enjoyable coming to work each day. They're good guys to work with," he added. ed to be sealed, the unique machine design took into account a predicted high risk of water inflows. The Crossover XRE ma- chine used a belt conveyor and not a screw conveyor for muck removal, so the muck chute needed to be able to be sealed off in the case of an inrush of water. The bulkhead was thus designed with a large sealing gate just above the belt conveyor. These pressure-relieving gates could also be used in a semi-EPB mode: As the pressure built in the cut- ting chamber, the gate would then be opened by the pressure, and material would spill onto the belt. As the pres- sure lowered, the gates would then au- tomatically close, again sealing off the chamber. In extreme cases, the gates could be sealed and the probe/grout drills could be used to drill, grout and seal off water. Additionally, the gripper shoes and inner telescopic shield were designed with inflatable seals to further protect against inrushes of water. With the breakthrough now com- plete, grouting will continue behind the seg lining will be added, and the tunnel is expected to become opera y 2019. ë headrace tunnel is part of the Devoll Hydropower Project, a Build-Own-Op- erate-Transfer (BOOT) scheme to con- struct two hydropower plants along the Devoll River, name ë and Banja. The project is owne power company Statkraft AS. The com- pleted Devoll Hydropower Project will increase Albania's electricity produc- tion by 17% and will have an installed capacity of 242 mw. Robbins TBM Completes Europe's First Crossover Breakthrough in Albania

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