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The intervention headwall is basically a thick, low-strength concrete wall of secant piles that the TBM can drive into and depressurize the cutter head and allow maintenance work / tool changes to be performed safely. Not sure if this is what they're doing in this context or if they're merely...

Tower crane coming down right now ... courtesy of the largest mobile crane in Ontario!

Tower crane going up with the help of a mobile crane from Mammoet on the new build.

Mammoet has a mobile crane on-site to remove the remaining tower crane.

Managed to catch the LR 1600 crane hoisting the bottom half of the TBM shield out of the shaft this afternoon, unreal to watch!

Is there a crane on-site yet to lift the TBMs out of the shaft?

Passed by the Port Lands on a Via train into Union this evening and saw some mobile crane parts (seemed to be luffing jib sections and y-guys) on flatbed trailers in a parking lot at the corner of Lake Shore and Cherry, anyone know if this is related to the current construction or maybe demo of...

Tower crane currently going up.

https://www.infrastructureontario.ca/en/news-and-media/news/subway-ontario-line-elevated-guideway-and-stations/agreement-signed-for-ontario-line-elevated-guideway-and-stations/