NORTH AMERICA PROJECTS | MECHANISED
CANADA Toronto, ON: Eglinton In Toronto, Infrastructure Ontario and Metrolinx have issued a Request for Proposals (RFP) for the Stations, Rail and Systems package on Eglinton Crosstown West Extension. Tunnelling works are well advanced on the project with twin TBMs - ‘Rexy’ and ‘Renny’ digging the western underground segment of the project. They completed their parallel drives in April and June, respectively. For the Stations, Rail and Systems package, three teams have been prequalified and RFPs issued. The package is being
delivered using a progressive design-build delivery model. The three teams are: Integrated Transit Partners ● Applicant leads: Sacyr Canada, NGE Contracting, and Siemens Mobility ● Primary design: Siemens Mobility, Hatch, Egis Canada, and Weston Williamson Partners ● Primary construction: NGE Contracting, Sacyr Canada, and Siemens Mobility Trillium Rail Partners (TRP) ● Applicant leads: Amico Major Projects, Alberici Constructors, and Acciona Infrastructure Canada ● Primary design team members: WSP Canada ● Primary construction: Amico Major Projects, Alberici Constructors, and Acciona Infrastructure Canada WestEx Transit Solutions ● Applicant leads: Aecon Infrastructure Management Inc, AtkinsRéalis Major Projects, Pomerleau Major Projects, and Dragados Canada
● Primary design team: AtkinsRéalis Canada and Arcadis Professional Services ● Primary construction: Aecon Infrastructure Management, AtkinsRéalis Major Projects, Pomerleau Major Projects and Dragados Canada.
The selected team will sign a Development and Master Construction Agreement and work collaboratively with Metrolinx through the development phase of the package, expected to start in summer 2025. The Stations, Rail, and Systems package includes design and construction of all stations and emergency exit buildings along the
extension, fit-out of tunnels and elevated guideway with track and signals, and installing and commissioning communications, ventilation and other support systems. The contract also includes utility work, road modifications along Eglinton Avenue West to accommodate construction, and changes at Mount Dennis Station that will help connect the extension to future Eglinton Crosstown LRT service. The 9.2km-long Eglinton Crosstown West Extension consists of four major packages of work: Stations, Rail and Systems; the
first advance tunnels contract from Renforth Drive to Scarlett Road (with TBMs ‘Rexy’ and ‘Renny’, launched in 2022); the second tunnel, section from Jane Street to Mount Dennis Station; and, the elevated guideway between Scarlett Road and Jane Street. The recently completed 3.9 miles (6.3km)-long tunnels, from Renforth Drive to Scarlett Road, were constructed by West End Connectors, a consortium of Aecon, Dragados and Ghella.
US
Virginia: HRBT Project With two parallel subsea road tubes to bore using a single large diameter TBM, the tunnelling journey on the Hampton Roads Bridge-Tunnel (HRBT) Expansion Project, in Virginia, was always going to be an interesting drive out - and then back. Earlier this year, the 46ft (14m)-diameter variable
density TBM achieved breakthrough to complete the first of the two bores through soft soils, taking around a year to complete the 1.5 miles (2.4km)-long tube. Launched from South Island (Norfolk side), the machine - ‘Mary’ - reached the reception pit at the other end of the tunnel, on the North Island, where a whole further challenge awaited. The heavy TBM had to be turned - to make a U-turn
in the open air pit - and be prepared for relaunch and the journey back to its starting point. No small added complication for the tunnellers as they work on Virginia’s first bored road tunnel. All other
tunnels in Hampton Roads are immersed tubes. The TBM U-turn would take up to six months, allowing for relaunch of the machine toward the end of the year and the process has gone well. Nitrogen skates were used to turn the TBM around –
the first time the method has been used in the US. It took eight hours. After that delicate task the shield’s gantries could then be removed from behind, in the bored tube. Buoyancy measures were installed in the tunnel to prevent lifting. Then the work began to reposition the gantries in the long reception and return pit for them to once again line up and form the backup train. The same technology was used previously in the UK,
on London’s twin-tube Silvertown road tunnel project. The US$3.9bn HRBT Expansion is Virginia’s largest
ever highway construction project, calling for the bored tunnel as well as widening an almost 10 miles (16km)-long section of the I-64 corridor in Norfolk and Hampton.
January 2025 | 15
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