Tunnelling for The Crosstown

Uploaded by CrosstownTO on 29.06.2012

Metrolinx is moving ahead on the Eglinton Crosstown LRT project.
Part of the Province’s 8.4 billion dollar investment in transit expansion for Toronto.
Construction will begin by digging tunnels that will carry the future Crosstown vehicles.
The project will run underground through the City Centre,
from west of Keele Street to Laird Drive.
The tunnels will be constructed by large Tunnel Boring Machines
or TBM’s for short.
The Crosstown TBM’s will be over 80 metres long.
Excavation of the launch shaft where tunneling will begin
is already underway between Black Creek Drive and Keele Street.
The TBM’s will be assembled in the launch shaft.
And will bore the first section of tunnels to Allen Road.
TBM’s operate deep below the surface and there should be no discernible impact
to properties from tunnel boring.
Regular monitoring of boring activity will be undertaken.
The TBM’s will drill their way eastward. Creating tunnels 6 and a half metres in diameter
at a rate of about 10 metres per day.
The spoils from the drilling will be collected by the TBM
and carried back on a conveyer belt then loaded into rail cars and transported
to the launch shaft at Keelesdale Park.
There they will be lifted out and stored for later removal.
Trucks will pick up the material and carry it out for re-use.
The volume of material to be excavated for The Crosstown tunnels will be enormous!
Enough material will be removed to fill the Air Canada Centre rink
to a height of 580 metres.
Pre-cast concrete liners will be placed on the tunnel walls
as the TBM drives through. The TBM propels itself forward by pushing
on these newly installed concrete panels.
At future station locations the headwalls for the station box will be
excavated and poured first. Then the TBMs will drill right through the
concrete walls.
The station box will be excavated during a later phase of the project.
When they reach Eglinton West Station, the TBMs will be extracted using a shaft located
just west of Allen Road. This will allow the TTC to maintain existing
subway service throughout construction and optimize the connection between new LRT
and the subway.
The TBMs will be refurbished and re-installed on Eglinton
just east of Allen Road for the second phase of tunneling to Yonge Street
After the tunnel excavation is complete, tracks and other utilities will be constructed
inside the new tunnels.
During the later stages of station excavation and construction,
traffic along these sections of Eglinton will be limited to one lane in each direction
for an extended period of time.
The project will eventually carry vehicles that will move Torontonians across the City
reliably and comfortably, and in half the time as with current options.
If you would like more information about The Crosstown please give us a call,
drop by our community office, or visit our website at www.thecrosstown.ca.