Toronto Eglinton Line 5 Crosstown West Extension | ?m | ?s | Metrolinx

[smallspy]

Is there a reason Metrolinx is going with the twin bored tunnels again? I thought they would be going forward in the future with single bore (as in the case with the Scarborough subway extension) in order to reduce costs amongst other reasons.

A single bored tunnel needs to be located quite a bit deeper than a pair of bored tunnels. The basic rule of thumb is that the tunnel needs to be covered by at least its own diameter.

As well, as the tunnel alignment is not strictly underneath the road, there may be some concern about any subsidence affecting neighbouring properties. It's generally easier to control it by using two smaller tunnels.

Dan

 

[ARG1]

I hope they take some design cues from the Reservoir Station, Genton and the guideway from the presentation and not do it the typical Toronto, half-assed.

Source: https://www.archdaily.com/949968/re...=widget&ad_name=more-from-office-article-show

That looks absolutely amazing, which means we aren't going to see it.

 

[M II A II R II K]

The renderings don't show 3 car trains.

 

[innsertnamehere]

Interesting. The elevated sections look a lot less bulky than the elevated portion of the Crosstown.

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It's a more similar style to what the Skytrain in Vancouver uses, which I think is more successful overall.

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[fanoftoronto]

The renderings don't show 3 car trains.

I wouldn't worry too much about the renderings just yet. These are super preliminary renderings enough to show high-level what it might look like. Someone pointed out that in the aerial view of Eglinton at Scarlett, showing the re-oriented Eglinton Ave, the Scarlett station isn't even rendered!

Interestingly, the current elevated portion of the LRT uses the pre-cast NU girder design that has been rejected for the Eglinton West line! Haha.

 

[Amare]

A single bored tunnel needs to be located quite a bit deeper than a pair of bored tunnels. The basic rule of thumb is that the tunnel needs to be covered by at least its own diameter.

As well, as the tunnel alignment is not strictly underneath the road, there may be some concern about any subsidence affecting neighbouring properties. It's generally easier to control it by using two smaller tunnels.

Dan

Hmm interesting. Now that you mention this, part of me thinks in addition to some of the reasons you mentioned above, I remembered there's a huge Enbridge pipeline located around Martin Grove and Eglinton and that could've cause some huge complications.

That could be part of the reason im just speculating. I wish Metrolinx came out and detailed their reasonings for going with single bore in this case.

 

[Streety McCarface]

Is there a reason Metrolinx is going with the twin bored tunnels again? I thought they would be going forward in the future with single bore (as in the case with the Scarborough subway extension) in order to reduce costs amongst other reasons.

A single bored tunnel needs to be located quite a bit deeper than a pair of bored tunnels. The basic rule of thumb is that the tunnel needs to be covered by at least its own diameter.

As well, as the tunnel alignment is not strictly underneath the road, there may be some concern about any subsidence affecting neighbouring properties. It's generally easier to control it by using two smaller tunnels.

Dan

Let us not forget about soil conditions. Generally they want these things in sound bedrock, which may have been too deep on Eglinton to justify a single bore.

 

[W. K. Lis]

None of the Eglinton West LRT Stations will look like any of these...

From link.

11. Heidelberger Platz station​

Berlin - Germany

10. Westfriedhof station​

Munich - Germany

9. Solna station​

Stockholm - Sweden

8. Olaias station​

Lisbon - Portugal

7. T-centralen station​

Stockholm - Sweden

6. Staromestská station​

Prague - Czech Republic

5. Plac Wilsona station​

Warsaw - Poland

4. Arts et Métiers station​

Paris - France

3. Stadium station​

Stockholm - Sweden

2. Bockenheimer Warte station​

Frankfurt - Germany

1. Toledo station​

Naples - Italy

---

Except maybe for the one in Doug Ford's neighbourhood. It'll be a Taj Mahal station.

 

[sixrings]

None of the Eglinton West LRT Stations will look like any of these...

From link.

11. Heidelberger Platz station​

Berlin - Germany

10. Westfriedhof station​

Munich - Germany

9. Solna station​

Stockholm - Sweden

8. Olaias station​

Lisbon - Portugal

7. T-centralen station​

Stockholm - Sweden

6. Staromestská station​

Prague - Czech Republic

5. Plac Wilsona station​

Warsaw - Poland

4. Arts et Métiers station​

Paris - France

3. Stadium station​

Stockholm - Sweden

2. Bockenheimer Warte station​

Frankfurt - Germany

1. Toledo station​

Naples - Italy

---

Except maybe for the one in Doug Ford's neighbourhood. It'll be a Taj Mahal station.

We could have those stations or build it basic and build it to Pickering.

 

[nfitz]

Let us not forget about soil conditions. Generally they want these things in sound bedrock, which may have been too deep on Eglinton to justify a single bore.

Bedrock is so deep along Eglinton, that they'd never have considered putting it in bedrock.

Single bore Line 2 extension to Sheppard West is 100% above bedrock.

 

[smallspy]

Let us not forget about soil conditions. Generally they want these things in sound bedrock, which may have been too deep on Eglinton to justify a single bore.

Tunnelling in bedrock is completely and totally unnecessary, especially in Toronto where our soil isn't actually horrible. And in fact, none of the machine-bored tunnels previously tunnelled in Toronto were in bedrock.

Dan

 

[crs1026]

^As I understand it, Toronto’s “bedrock” isn’t all that great for excavating and tunnelling anyways - it’s elastic.

- Paul

 

[W. K. Lis]

Tunnelling in bedrock is completely and totally unnecessary, especially in Toronto where our soil isn't actually horrible. And in fact, none of the machine-bored tunnels previously tunnelled in Toronto were in bedrock.

Dan

Don't forget that the Eglinton West extension will run through Doug Ford's neighbourhood. It MUST be UNDERGROUND. Doug must NOT see the peasants when he drives around in his SUV.

 

[AlvinofDiaspar]

^As I understand it, Toronto’s “bedrock” isn’t all that great for excavating and tunnelling anyways - it’s elastic.

- Paul

It's shale - and has a tendency to swell:

Toronto’s swelling bedrock - Spacing Toronto

In general, Toronto is a relatively easy place to build underground. Our glacial history left the city with stiff clayey soil and our earthquakes are small and infrequent. The soil is forgiving when excavating and has low permeability, meaning excavations can be made dry (a very big deal when...

spacing.ca

AoD

 

[kamira51]

It's shale - and has a tendency to swell:

Toronto’s swelling bedrock - Spacing Toronto

In general, Toronto is a relatively easy place to build underground. Our glacial history left the city with stiff clayey soil and our earthquakes are small and infrequent. The soil is forgiving when excavating and has low permeability, meaning excavations can be made dry (a very big deal when...

spacing.ca

AoD

That's a very interesting article, a very good read indeed.