Toronto GO Transit: Davenport Diamond Grade Separation | ?m | ?s | Metrolinx

vic said:
Any idea what's up with the scaffolding around those girders?
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It looks as if the sections may also have to be grouted as part of the pre-stressing. If so, it may just be to allow access and to keep the snow off of them as the grout sets.

Dan
 
ARG1 said:
The plan is to build 1 track, and then once that's done, move service onto the guideway and commence construction on the 2nd track of the guideway - replacing the existing temporary diversion track.
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They are not doing that. The erecting truss that they are using is designed to straddle both beams.

You are correct that they will be putting one track into service before the other, but that has more to do with the tie-ins to the existing track and the requirement to finish a section of the MSE wall on the north end only after the ground-level track is removed.

Dan
 
The EPR is good source for those wondering what is being built:

http://www.metrolinx.com/en/regionalplanning/rer/davenport/epr/Davenport_Diamond_EPR_Main_Report.pdf

Sequence of construction begins on pdf page 62. It reads to me that the left and right side boxes are craned up separately and transverse post tensioning happens afterwards so I don't know what is happening under the scaffold.
2 tracks are being built with just the tie-ins at the endpoints to be done in stages. The current diversion track will become a path.
 
okay now im confused, the GO RER will make this 2x track, are they building a 2nd guideway once the first is finished? or is that being left for the ONCOR project
 
generalcanada said:
okay now im confused, the GO RER will make this 2x track, are they building a 2nd guideway once the first is finished? or is that being left for the ONCOR project
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The overpass under construction is 2 tracks wide; one track directly over each line of pillars.
 
From earlier in this thread, at this link...

51790182476_71126d4a6b_h.jpg
 
Neil said:
The EPR is good source for those wondering what is being built:

http://www.metrolinx.com/en/regionalplanning/rer/davenport/epr/Davenport_Diamond_EPR_Main_Report.pdf

Sequence of construction begins on pdf page 62. It reads to me that the left and right side boxes are craned up separately and transverse post tensioning happens afterwards so I don't know what is happening under the scaffold.
2 tracks are being built with just the tie-ins at the endpoints to be done in stages. The current diversion track will become a path.
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The EPRs are a great guide, yes, but.....

They are also not necessarily a perfect recreation of the final project, just a representative guide. For instance, the EPR only has a short section of MSE wall north of the bridge over the CP tracks, whereas the as-built will have an MSE structure all the way north from the bridge. It also shows an MSE wall immediately south of the bridge - that obviously isn't happening.

In a lot of these Metrolinx-led contracts the final form of the project is left up to the bidders, with the EPR serving just as a loose guide as to how to get there - not an actual step-by-step plan.

Dan
 
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