Galipeault South Bridge Highway 20

Demolition and Reconstruction

The City of Sainte-Anne-De-Bellevue awarded us the mandate to rebuild the Galipeault bridge structure between Île Perrot and the Island of Montreal.

Our work included the following elements:

• Demolishing the old concrete bridge (cable-stayed bridge).
• Building a new, wider bridge with a mixed steel-concrete deck to meet current industry standards.
• Building box piles with a diameter of 3.6 meters.
• Erecting a steel structure via barges (steel beams up to 55 tonnes).
• Adding a third eastbound lane.
• Modifying the layout to allow oncoming westbound vehicles to merge more safely.
• Widening the shoulders to ensure greater safety in case of breakdown or accident.
• Integrating a curved, multi-purpose path on the south side to replace the existing bike path and sidewalk.
• Building a lookout for pedestrians and cyclists.

During the demolition of the Galipeault bridge, we adopted the following two methods to prevent residue from falling into the water and to limit dust and noise, which helped ensure we did not receive any complaints:

• Installing two cranes to remove in tandem pieces  weighing up to 30 tonnes.
• Salvaging the old beams to build a temporary bridge on piles to protect the river bottom during construction.

Despite many challenges, we completed this $76.3 million project in just over two years.

Managing Residential, Tourist and Vehicle Traffic

We had to carry out the work despite the presence and management of many residents, numerous tourist attractions and heavy traffic nearby.

Protecting a Spawning Area

We applied protective techniques to prevent the work from impacting the nearby spawning area.

Anchoring in Harsh Conditions

We had to install a rock anchor system in very difficult conditions.