Tunnel Business Magazine

FEB 2018

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TUNNELINGONLINE.COM 4 1 TBM: TUNNEL BUSINESS MAGAZINE // FEBRUARY 2018 130 ft deep receiving shaft. The tunnel is to be mined in intact gneiss bedrock using a double shielded rock gripp ed by Lovsuns. The shaft construction consists of liner plate and rock dowels with wire mesh. The project also includes 1,600 lf of 60- and 42-in. upstream and downstream connecting sewer as well as several junction chambers, screening/diversions structures and odor con- trol facilities. e to Proceed is expected to oc- ch 5, 2018. Completion is expected by June 26, 2020. Tunnel Designer /Construction Man- ager – Black & Veatch; TBM Manufacturer – LO Canada. Major Subcontractors and Suppliers – Chardon Concrete (Concrete Structures), Pacific International Grout (Cel- lular Grout), Tunnel Carrier Pipe (Hobas Pipe). Key Project Personnel: Jo ulville – Se- nior Proje , Super Excavators/ eg Rehak – Vice President, Super Excavators; Stephen O'Connell – Con- , Black & Veatch; Jason Gil- lespie – Senior Proje , Renewable Water Resources. VIRGINIA Virginia Beach Parallel Thimble Shoal Tunnel Dragados USA/Schiavone The Parallel Thimble Shoal Tunnel is part of the overall Chesapeake Bay Bridge and Tun- nel, a 20-mile-long vehicular toll crossing of the lower Chesapeake Bay. This facility car- ries US Route 13, the main north-south high- way on Virginia's Eastern Shore, and provides the only direct link between Virginia Beach and the South Hampton Roads, Virginia. The crossing consists of a series of four lane low-level trestles and bridges which are con- nected by two approximately one-mile-long two-lane tunnels beneath the Thimble Shoal and the Chesapeake navigation channels. The Parallel Thimble Shoal Tunnel will be approximately 5,700 lf, 42-ft OD and is being procured through a design-build contract, awarded in 2016 to a Dragados–Schiavone JV. The project is aimed to improve the level of service and safety along the current crossing, allow for more open lanes during ordinary maintenance and provide an alternate route in the event of an accident in the existing tun- nel. The JV submitted the lowest price pro- posal at $755,987,318. The JV has proposed to construct a bored tunnel for the new Parallel Thimble Shoal Tunnel. Construction will begin on Island 1 with the construction of a large pit. The tun- nel b e delivered to the site in several large pieces and will be assembled in the bottom of the excavated pit. After assembly of the Herrenkne construction of the tunnel will begin. A groundbreaking ceremony was held in September 2017. Construction duration is an- ticipated for 3.5 years. WASHINGTON Bellevue Downtown Bellevue Tunnel (E330) Guy F. Atkinson Construction This is a $121 million project as part of Se- attle Sound Transit's East Link light rail exten- sion project. The tunnel consists of 1,985 lf of ovaloid tunnel, approximately 34-ft ID, 12 to 48 ft deep. In addition to the tunnel, there is one maintenance shaft (17-ft diameter, 50-ft deep) located near the midpoint of the tunnel, a connecting adit to enlarged tunnel section for permanent ventilation fans, and 250 lf of cut-and-cover structure. Crews are excavat- ing soft ground consisting of glacial till and outwash gravel, using sequential excavation metho (three headings) as well as single side drift (6 TP was issued in Feb. 2016 with substantial completion planned f y 2020. Crews have completed excavation and sup- port of first 54% using full top heading, bench and invert, currently excavating and sup- porting using single side drift. Construction of mid-tunnel maintenance shaft and adit is scheduled to start spring of 2018. Crews are utilizing two Liebherr 950 to excavate the praymec 8100 shotcrete robot to place the shotcrete lining. obs Associates are the esident Engi- neer unnel Designer. Guy F Atkinson is the Contractor with GZ unnel Engineer. Key Project Personnel – Sound Transit: Chad Frederick, Principal Blake Jones/Ryan Lescouflair, Community Out- reach. Atkinson: Archie Kollmorgen, Project e Coibion, T - Jacobs Associates: Ted DePooter, Resi- dent Engine un Wei Leong, Office Engineer. CANADA ONTARIO Ottawa O-Train Confederation Line Light Rail Transit Project Rideau Transit Group To build the O-Train Confederation Line, the City of Ottawa assembled a strong public- private partnership that includes financial commitments from the provincial and federal governments, and a proven private-sector project team, the Rideau Transit Group. A world-class consortium of Canadian and in- ternational companies, the Rideau Transit Group was selected in a highly competitive process based on the strength of the group's design, construction and financial proposal, and its track record of delivering major trans- portation projects on time and on budget. Working closely with the City of Ottawa, the Rideau Transit Group designed and began building the $2.1 billion Confederation Line in 2013 and will maintain the line until 2038. Revenue Service begins when the build is completed in 2018. An integral part of the Rideau Transit Group (RTG) proposal for the Confederation Line was the approach to the construction of the tunnel under Ottawa's downtown core. The tunnel spans 2.5 km, is on average 15 m below the surface and features three of the stations in the Confederation Line project — Lyon, Parliament and Rideau. Following the bid process in 2012, the City's experts from around the world worked to de- termine the tunneling method and equipment required for the Confederation Line tunnel. Proximity to the Rideau C World Heritage Site, the specific soil condi- tions of the downtown core, and the properties of the geotechnical materials to be excavated were all evaluated. It was also important that the tunneling method minimize disruptions for the general public and daily life in the city. Sequential Excava use ovides a high degree of flexibility to adjust the excavation ap- proach and support measures for soil and rock conditions encountered; it also reduces risks of tunneling construction. This method also minimizes longer term disruptions at surface. first light rail vehicle assembled in Ottawa was tested on the track between Blair and Cyrville stations; Q1 2017 - Tunnel excava- tion completed; Q3 2017 - Overhead Catenary System installed and powered between Trem- blay and uOttawa; Q3 2017 - Train testing on the eastern section of the track; Q4 2017 - 20 LRVs assembled, 4 more on the assembly floor (of 34 planned vehicles). Current construction activities include track work and finish work on stations. Trackwork teams are focused on completing trackwork at the East Portal, the West Portal, around Parliament Station and up to Rideau Station. In the West, crews are tamping a west-bound section of track near Pimisi Sta- tion while rail installation is currently taking place at Tunney's Pasture. Train testing is on- going on the eastern stretch of the alignment. State-of-the-art mining techniques helped minimize impacts on residents and business- es. Using the sequential excavation method has meant that only three access points are required, drastically minimizing closures and detours. Using smaller, quieter roadheaders to dig the tunnel, instead of a large tunnel boring machine, greatly limited noise and vibration for surr uch of the work on the tunnel is happening 15 m below the surface with little sign of what is happening below at street level. Rideau Transit Group equity partners are: ACS Infrastructure C -Lavalin and EllisDon. DBJV is made up of: Dragados C -Lavalin. Some of the other firms that have worked on the project include: Thurber Engineering Ltd. (geotechnical); Dr. Sauer & Partners Cor- poration (tunnel design); Adamson & Associ- ates Architects (station design); Alstom – ve- hicle; Thales – systems; bbb Architects (station design); Fast + Epp; Ha IBI Gr oup; Sereca Fire Consult- ing Ltd.; and Scotia Capital. Key Project Personnel – City of Ottawa/O- Train Construction Offic oni, Gen- er , Transportation Services; Steve Cripps, Director, O-Train Construction; Gary Cr , Light Rail Design and Construc- tion. Rideau Transit Group/OLRTC: Antonio Es- trada, CEO, Rideau Transit Group; Peter Lauch, Technical Director, Rideau Transit Group; Eu- gene Creamer, OLRTC Project Director; Hum- berto Ferrer, OLRTC Deputy Project Director. T U N N E L U P D A T E S

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