Aplus23
Active Member
I mean they waited on the TBM to finish before they started station work. That totally slows up the process
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Richard White
Senior Member
It does but the Eglinton Subway I'm referring to was the one in 1994.
They started construction only to have everything filled in. It's alot harder to fill in a completely finished line than it is a small section.
They may be wanting to wait until the tunneling is finished to avoid a similar fate.
TOtramz
Active Member
wouldn't it make more sense to start station excavation now so that it is even harder to fill everything up and cancel it?
Steve X
Senior Member
Have you thought about while excavating on top can cause the tunnels to collapse which would have trap anyone further along or more deadly having it collapse onto passing under workers as they switch shifts. Trucks of dirt still have to be shipped back out to the launch shaft so they can't really work on the station structure or do any concreate pours till the TBM is done with the temporary tracks removed.
So it's either excavate before the TBM arrives or when the TBM is completely done. Alternatively, they could relaunch the TBM like they did with the TYSSE but still that needs the station boxes to be fully excavated. The OL would not use this approach and we can see them excavating the station caverns first.
nfitz
Superstar
Filling in a hole is easy. Removing a tunnel is something else.
I do like the way they launched from the far end - reducing any chance that they'd cancel the last station. By luck or design I don't know - though I have heard stories about other subway systems doing this strategically.
Richard White
Senior Member
This happened in Toronto I believe. Originally the Sheppard Line was to go to Vic Park on the other side of the DVP/404.
Unfortunately due to financial constraints it was curtailed at Don Mills.
Most systems build in phases now. Budapest for example built only Phase 1 of the M4 metro line. Phase 2 was never built and from my understanding is mothballed.
officedweller
Senior Member
Will the stations have double decker tracks?
For the SkyTrain Evergreen Line, they divided the tunnel left/right with a vertical wall down the middle (but no stations on that segment).
TOtramz
Active Member
I guess drilling piles and other bore holes doesn't threaten the tunnel in a significant way?
If you look at the site now there are tons of machines boring into the ground at STC station.
smallspy
Senior Member
No. The two tracks will be built side-by-side and have a fire wall built between them. It is expected that most of the station's platform area can be built within the tunnel's diameter.
Dan
random1458756981254
New Member
That decision was made way back (over 10 years ago). After years of evaluating whether the ATSSE should go for a two-TBMs approach or just for a single TBM.
I remember hearing that it would be more cost-effective, environmentally friendly, and have a smaller impact on the neighbourhood.
random1458756981254
New Member
If you come too close, it will. Don`t forget the TBM is working with pressure, which means if you open a hole from the top down to the TBM, the pressure will relieve to the surface.
The current work on the STC station is far away from the tunnel alignment and has no impact on the zone of influence of the TBM.
gregv
Active Member
STC August 1st:
Aplus23
Active Member
Lots of activity today at the parking lot of the Don Montgomery recreation center / this work is for the SSE
TOtramz
Active Member
Given that the stations contract was signed this year but it may be several years away until they can seriously start to construct the stations, might this have any potential ramifications?
Undead
Senior Member
Today:
