During peak production, over 250 personnel in the Tyam Canada Line division will
work on this project. Our highly-specialized team is made up of an experienced management
team, including registered professional engineers, as well as highly-skilled construction
technologists who manage field operations. This level of expertise allows for a
creative, high-quality and productive work environment.
The scope of work to be completed by Cambie St. Constructors Inc. (CSC), a wholly-owned
subsidiary of Tyam, includes all major structural works for the underground Vancouver
section between 64th and 2nd Avenues .
CSC is under contract to SNC-Lavalin to construct the Cambie Cut & Cover portion
of the Canada Line. As the parent sub-contractor, CSC will provide:
- Traffic Management
- Utilities Relocation
- Excavation and Shoring
- Concrete Tunnel Construction
The final portion of the project will be to complete two 6.5 km reinforced concrete
tunnels beneath the northbound vehicle lanes of Cambie Street, as well as excavate
and reinforce shoring of four station boxes. Challenging aspects of this project
involve working in the middle of a busy city, limited working conditions and a very
tight schedule.
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Traffic Management
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Proper traffic management is a key issue for this project. In agreement with the
City of Vancouver, CSC is maintaining north-south traffic along Cambie Street and
limited east-west movement on its major cross streets at all times during project
construction.
CSC is providing construction and implementation of traffic management plans, including
installing seven vehicle bridges, road widening and changing traffic patterns to
facilitate construction of utility work and the guideway structure. When enough
of the guideway structure is completed, then backfill, soil compaction and roadway
reinstallation work will begin.
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Utilities Relocation
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Cambie Street, which serves many surrounding populations, is one of Vancouver’s
major North-South arterial routes with many underground utilities. That’s why the
design of utility relocations and supports are a significant undertaking. CSC is
cooperating with the engineering departments of Metro Vancouver, the City of Vancouver,
BC Hydro, Telus, Shaw and independent consultants to relocate or support-in-place
potable water mains, sanitary and storm sewers, hydro ducts and telecommunication
lines.
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Excavation and Shoring
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Mainline bulk excavation is taking place at the same time at different headings,
and excavation to design grade is occurring at four station boxes (49th, 41st, King
Edward and Broadway Avenues). On a daily basis, excavation will follow with a shoring
system of tension stressed anchors and reinforced shotcrete.
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Concrete Tunnel Construction
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Once a mud slab is laid, concrete guide way tunnel construction begins. This portion
of the project consists of 4.2 km of side-by-side tunnels, 1.1km stacked tunnels
(due to constricted width of an area of Cambie Street), and 0.6km rollover structure
to transition between the side-by-side and stacked tunnel configuration.
The tunnels are created in three principle sections of reinforced concrete; the
base (track) slab, the walls and the roof. The shotcrete shoring system creates
the outside form of the tunnel in all sections. In the stacked and side-by-side
sections, a travellerPERI tunnel formwork system is being used, which allows the
wall and roof slab to be poured at the same time.
Upon completion, over 117,000 cubic meters of concrete will encase over 13,000 metric
tonnes of reinforcing steel. Completion of the Cut & Cover project is scheduled
for April 2008. (5 months ahead of schedule)