Jul 21, 2023

From my last pic of May 1, 2023, doesn't take long for nature to take over.

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This video is from 4 years ago, explaining the underpinning being done under Eglinton Station for Line 5. Bet this is why everything is s-l-o-w in completing the Line 5 stations. Why don't they just say that is the reason we are so behind.


Guessing that they will NOT be using this methodology to build the Osgoode and Queen Stations for the Ontario Line. Unless they are very, very quiet about it.🤫
 
W. K. Lis said:
This video is from 4 years ago, explaining the underpinning being done under Eglinton Station for Line 5. Bet this is why everything is s-l-o-w in completing the Line 5 stations. Why don't they just say that is the reason we are so behind.


Guessing that they will NOT be using this methodology to build the Osgoode and Queen Stations for the Ontario Line. Unless they are very, very quiet about it.🤫
Click to expand...
The reason the OL stations are so deep along Queen St is exactly because they are not using this method. Osgoode and Queen will instead be in the bedrock which removes the need for underpinning but makes the stations fairly deep. You can even see with the designs for both stations, they avoid digging under the existing stations until it's within the bedrock. (which is why in the one diagram of Queen station there is a volume of soil below the current station and above the OL station, with the escalators on either side of that) Almost certainly, this is as you suggest, a reaction to the schedule issues with underpinning on the Crosstown.
 
Aug 26, 2023

Queen St. north entrance.
In anticipation of the extra foot traffic caused by the new subway line entrance (proximity) , I've included photos of the new staircases.
If this wasn't the reason for the addition, it'll help out with the congestion (or add to it).

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TossYourJacket said:
The reason the OL stations are so deep along Queen St is exactly because they are not using this method. Osgoode and Queen will instead be in the bedrock which removes the need for underpinning but makes the stations fairly deep. You can even see with the designs for both stations, they avoid digging under the existing stations until it's within the bedrock. (which is why in the one diagram of Queen station there is a volume of soil below the current station and above the OL station, with the escalators on either side of that) Almost certainly, this is as you suggest, a reaction to the schedule issues with underpinning on the Crosstown.
Click to expand...

I remember reading that Montreal achieved great cost savings in cutting most of their subway system through bedrock and by using smaller trains and tunnels.

What they also did in Montreal is to dig large holes for the stations and having the tunnels slope upwards to the stations. Thus, trains decelerate going up the slope as they approach stations using gravity, and the stations aren’t as deep. These engineering decisions also allowed for more airy and architectural stations.
 
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