O-Train Line 1/3 [Stage 2 | West Extension | Tunney's to Baseline/Moodie] | U/C

[Richard Eade]

Does anyone have information about how the builder intends to make the LRT underpass under Carling?

Will they ‘Jack’ in a shield and mine, or close lanes on Carling and Cut & Cover, half at a time?

Or, maybe, they could try something new? Close single lanes (maybe even overnight) while bore-holes are drilled and filled with concrete, forming a SECANT PILED WALL for each side of the future underpass. Once the walls have cured, half of Carling is closed at a time and a shallow excavation is made so that the ground becomes the form of the bridge deck; which is then poured – again, this is done for half of the road at a time. Once sufficiently cured (remember, the decks are still fully supported by the ground below), traffic is allowed back on the resurfaced roadway. Once the concrete decks have fully cured, the spoil underneath can be removed. The closing/detour of the roadway is minimized when compared to a Cut & Cover implementation.