Sorry I missed this. Looked like fun.
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CDL.TO
Moderator
I wonder how this approach compares to the "drag through" approach I've seen used elsewhere. That's where they excavate the station box first and drag the TBM through it.
[video=youtube;EcF1MKfGreU]https://www.youtube.com/watch?v=EcF1MKfGreU[/video]
[video=youtube;EcF1MKfGreU]https://www.youtube.com/watch?v=EcF1MKfGreU[/video]
Voltz
Senior Member
I was wondering why they did not try something like this.
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JayBeeGooner
Active Member
Because TBMs are usually "dragged" through a station box to continue tunneling. Since the station box for the station wasn't built yet, it made more sense to lift the TBMs over the existing subway and continue tunneling to Yonge. If the TTC was building the ECLRT, it's likely the station would have been built, but Metrolinx wants the stations to be built at the same time.
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howl
Active Member
They plan on tunneling under the both subway lines (Spadina and Yonge) using a much less intrusive method.
Regarding the timing of building the stations and tunnels, obviously you can't build them at the same time. You have to build one first then the other. One of the biggest hold ups for the station construction is they need to acquire all the land. If an owner doesn't want to sell they need to expropriate and it can take up to a year to go through that legal process. If they wanted to build the stations first we would still be waiting to start tunneling. starting the tunneling first means they will be done sooner.
TransitPolicyChanger
Active Member
Looks like SNC will be playing a big role moving forward with the Crosstown:
http://business.financialpost.com/n...act-in-deal-that-may-be-worth-up-to-4-billion
Good to see parts of this project moving forward and being awarded - not sure I'm completely satisfied with the result.
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ehlow
Senior Member
Once the contract is awarded, I wonder how long before work on stations at the at-grade section starts?
jcam
Active Member
Also, the diameter of the TBM is much larger that the height needed for a poured tunnel to fit the same size subway car. By manually digging, they can place the two station platforms at a closer elevation. Saves money on depth of station, allows easier build of service access and rooms around the station tie-in, and creates (slightly) less height for transfer of passengers between levels.
TheTigerMaster
Superstar
CDL.TO
Moderator
No, they'll build it too.
It's a DBFM contract: design, build, finance, maintain. Though, in this case, they won't have complete control over the design.
It's a DBFM contract: design, build, finance, maintain. Though, in this case, they won't have complete control over the design.
ehlow
Senior Member
Yeah. It seems plausible that end of this year early non-tunnel construction might start, but I'm just speculating.
TheTigerMaster
Superstar
Oh great news.
I wonder how soon construction can begin on the stations?
Also, I hope the firm isn't in control of the architectural design.
innsertnamehere
Superstar
They are. Basic station layouts are done already, but architectural design is being done by the contractor.
That said, as part of the bid they were told to create interesting architecture so don't expect a sheppard subway 2.0. I wouldn't go expecting a Spadina subway either though, probably something in between the two.
That said, as part of the bid they were told to create interesting architecture so don't expect a sheppard subway 2.0. I wouldn't go expecting a Spadina subway either though, probably something in between the two.
nfitz
Superstar
Spending so much time on the Bloor-Danforth with the washroom motif, I always though Sheppard WAS interesting architecture!
TheTigerMaster
Superstar
"Interesting architecture" = "throw a cheap mural on the wall"
Seriously, I hope the RFP dictated what exactly "interesting architecture" means.
Seriously, I hope the RFP dictated what exactly "interesting architecture" means.