[Richard White]

I mean they waited on the TBM to finish before they started station work. That totally slows up the process

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]

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.

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]

Destination like Kennedy? Why does the TBM have to finish before they start excavation? They did that for Eglinton too

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]

wouldn't it make more sense to start station excavation now so that it is even harder to fill everything up and cancel it?

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]

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

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]

A single bore can speed up the project significantly if it worked out. The whole station box won't have to be excavated, instead the platforms would be built in the tunnel on two different levels. They just need to dig a few shafts for the stairs, elevators, ventilations and utilities. This would reduce the whole building footprint.

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]

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.

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]

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).

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]

I'm sure it was mentioned somewhere way back, but why did they end up choosing single bore for this? It seemed for a while twin bore was the default for projects, but it seems single bore is back in vogue. I'm curious as to the reasoning

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]

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.

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]

STC August 1st:

 

[Aplus23]

Lots of activity today at the parking lot of the Don Montgomery recreation center / this work is for the SSE

 

[TOtramz]

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]

Today:

 

[Thaboss]

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?

Without having all of the facts, I doubt it.


This line is not going to be ready for another 5 - 7 years. If 3 stations can't be built in this time then what the hell are we doing lol