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Deconstruction Methods

Different methods will be used depending on the section to be deconstructed and the bridge components to be taken down.

Around 65% of the work will be done from work platforms in the water that are away from residential areas.

Shoreline deconstruction (Île des Sœurs and Brossard)


Method: Traditional mechanical deconstruction on land

Work steps:

  • Preparatory work
    • Dismantling of components (overhead signage, lights, etc.)
    • Components removed for the Research and Development program
    • Removal of reinforcements 
  • Installation of temporary supports 
  • Deconstruction of the spans and piers
  • Disposal and removal of debris
  • Restoration of the area
Deconstruction over the river


Method: Deconstruction from a platform on a catamaran barge

Work steps: 

  • Preparatory work
    • Dismantling of components (overhead signage, lights, etc.)
    • Components removed for the Research and Development program
    • Removal of reinforcements 
  • Span recovered with a system of platforms attached to lifting towers installed on a catamaran barge
  • Deconstruction of the span on the catamaran barge
  • Barge-based mechanical deconstruction of the piers and footings above and below the water level, from top to bottom
  • Debris disposal by barge
Deconstruction of the steel structure over the seaway


Methods used to remove the steel structure:

  • The suspended span will be placed on a barge with strand jacks and dismantled on the barge piece by piece.
  • The cantilever sections and anchor spans will be taken apart piece by piece using a crane set up on temporary jetties.
  • The piers will be mechanically deconstructed with high-capacity excavators.

Work advisories

From July 29, 2021 to January 31, 2022
Seaway Dike | Installation of a safety corridor for pedestrians and cyclists under the original Champlain…
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