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

[innsertnamehere]

Interesting that they appear to be doing poured in place instead of modular.

 

[Aplus23]

I was anticipating the elevated section would be made how the Davenport elevated section was made, with the machine attached to the form piers and and the pre-cast segment slid into place, seemed like that process was much quicker

 

[urbancog]

Perhaps because these sections are so close to firm ground it's less expensive to build (quite elaborate) temporary works and poor the whole span than fussing with matched precast units.

 

[smallspy]

Perhaps because these sections are so close to firm ground it's less expensive to build (quite elaborate) temporary works and poor the whole span than fussing with matched precast units.

While that is also likely a reason as to why they've done it this way, I suspect that because many of the girders are curved rather than straight is the primary factor here.

All of the Davenport girders were straight, which simplified that process.

Dan

 

[BrenWilson]

It's true that the TBM portion of the Line 5 extension seems to have gone more smoothly than any other recent tbm project in Toronto. I wonder why - different contractor? different design? premium quality central Etobicoke soil ?

- Paul

Less buried watercourses, less buried infrastructure. There are a few overlaps between WEC (ECWE ATC1 contractor) and CTS (ECLRT contractor) - Aecon and Dragados are involved in both. SSE is Strabag doing the tunneling, but their issues seem to revolve around the complexity of such a large single TBM and unexpected poor soils under the 401. Strabag is doing the mined tunnel for ECWE and seem to be doing fairly well.

 

[Ratazana]

Richview (Islington) on Wednesday.

 

[Ratazana]

Royal York. Pretty much all stations have active constructions happening.

 

[BrenWilson]

Yes the ATC1 contractor got a contract variation to construct the sidewall shoring of the station boxes for the underground stations (they had previously done the headwalls before tunneling).

 

[Westey]

Perhaps because these sections are so close to firm ground it's less expensive to build (quite elaborate) temporary works and poor the whole span than fussing with matched precast units.

The bridge geometry (cross section) is different than a highway bridge, so they have to make new forms for it. Generally, having a plant to make matched precast units only becomes cost-effective with bridge of over a mile in length.