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T3G said:
Can politicians shut up? I mean Jesus. The ruling class is not exactly made up of the brightest minds in the country, but the soundbites in this article seem unusually vapid:


Well, which is it, generational or once in a lifetime? And is this an admission that in 10 years when the TR replacements need to be procured there won't be any money coming for them? 😁
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The thing is, all politicians seem to do this. It is not a new phenomenon, at least not in the last few decades. I feel the general public is getting tired of it though.
 
Good to finally find out what the problem is. I believe they realized there was a problem immediately, I found it strange they started doing headwall construction on the SE corner of McCowan and Sheppard in March/23 two months after tunneling began. I wonder if this was supposed to be an intervention shaft. The first mention of an intervention shaft for “maintenance” was the community letter sent out to the Brimorton neighborhood about the need to complete the headwalls south of that intersection and expose the TBM for maintenance this fall. Unfortunately it looks like it needs to be fixed where it is now. After almost 2 years of tunnelling they are just a fraction of the way there. Two years was the original time frame for complete tunnelling. Station construction can’t start until tunnelling complete. My guess is that we are at least 2 years behind and that’s if they can solve the problem.
 
NIV said:
Good to finally find out what the problem is. I believe they realized there was a problem immediately, I found it strange they started doing headwall construction on the SE corner of McCowan and Sheppard in March/23 two months after tunneling began. I wonder if this was supposed to be an intervention shaft. The first mention of an intervention shaft for “maintenance” was the community letter sent out to the Brimorton neighborhood about the need to complete the headwalls south of that intersection and expose the TBM for maintenance this fall. Unfortunately it looks like it needs to be fixed where it is now. After almost 2 years of tunnelling they are just a fraction of the way there. Two years was the original time frame for complete tunnelling. Station construction can’t start until tunnelling complete. My guess is that we are at least 2 years behind and that’s if they can solve the problem.
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The questions I would have for ML are

1) When was the "non-functioning" of the TBM first identified?
2) When was the decision made to shift the location of the "intervention shaft"?
3) What is the impact on contingency and projected tcd for the tunnelling drive?
4) What is the impact on start and completion dates for downstream tasks eg stations, emergency shafts?

I am speculating that those first two dates are now months in the past

Which leads to my final question

5) Why was this not disclosed publicly before now?

- Paul
 
NIV said:
Today marks the two year anniversary of the start of tunnelling. Has metrolinx given any updates on fixing the TBM or when tunneling will resume.
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Metrolinx hasn't even admitted there's anything to fix on the TBM, other than Verster's off-hand remark about soil conditions, just before he "quit".
 
It would be informative to compare the linear meters of tunnel excavated by this TBM versus the other recent Toronto TBM projects (TYSSE, Crosstown, Crosstown West).

I bet the data would paint a picture that is hard to ignore.

- Paul
 
crs1026 said:
It would be informative to compare the linear meters of tunnel excavated by this TBM versus the other recent Toronto TBM projects (TYSSE, Crosstown, Crosstown West).

I bet the data would paint a picture that is hard to ignore.

- Paul
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Well, about 1,000 metres divided by 730 days ... is about 1370 millimetres per day. What the tunnel segments - 1500 mm each?
 
A little quick googling

TYSSE - TBM launch June 17 2011, complete Nov 8 2013 (4 tbms, two paired tunnels, multiple drives)
Crosstown - TBM launch June2013 complete Aug 17 2016 (4 tbms, three drives for two paired tunnels)
Crosstown West - TBM launch April 11 2022 complete June 2024 (two tbms, paired tunnels)

- Paul
 
crs1026 said:
A little quick googling

TYSSE - TBM launch June 17 2011, complete Nov 8 2013 (4 tbms, two paired tunnels, multiple drives)
Crosstown - TBM launch June2013 complete Aug 17 2016 (4 tbms, three drives for two paired tunnels)
Crosstown West - TBM launch April 11 2022 complete June 2024 (two tbms, paired tunnels)

- Paul
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What are you trying to gauge? the Scarborough TBM is clearly stuck and Metrolinx is mum about it.
 
northyorker1 said:
What are you trying to gauge? the Scarborough TBM is clearly stuck and Metrolinx is mum about it.
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Exactly the point. The question implied was, how much had these earlier TBM projects accomplished by their second anniversary?

The answer is - lots, ie far far more than Diggy Scardust has produced.

At this point the issue becomes one of how much is the project now delayed, and how much has the cost risen simply due to deferral of work and changes in financing costs?

- Paul
 
I believe the single deep single tunnel bore was designed with the one stop extension in mind, tunneling under highland creek and minimizing vibration to adjacent houses. When we went back to the three stops they kept this design because of the time and money already spent. Elevated bridge station over highland creek at Lawrence and elevated from STC to Sheppard with bridge over 401 is what should have been built. The houses that back on to McCowan and Danforth rd should have been bought up and used for future development.
 
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