2019 CSCE Annual Conference - Laval (Greater Montreal) Conference
Ms. Urszula Wajdzik, Reinforced Earth
Work phasing and traffic maintenance can be the major components of a civil engineering project, particularly in densely populated cities. These items are even more critical when the project involves the reconstruction of a main inner city highway where traffic cannot be stopped or completely diverted.
All these challenging conditions were present in the reconstruction project of Turcot interchange in Montreal, Quebec. In this project, even large structures must remain in service while some parts of it being demolished and reconstructed. Reinforced Earth walls were used in all phases of the project. The temporary and permanent structures built in complementarity to allow the movement of thousands of vehicles during the demolition of existing structures. Adding to the complexity, the very limited space required the construction of MSE retaining walls within the perimeter of existing structures, sometimes directly on the edge and even sometimes under these bridges, while settlements of existing structures must stay within the allowable limits under the new load configurations.
Using MSE walls in construction phasing is not uncommon but the complexity of construction phasing in Turcot Project makes it a unique example. In this paper, we discuss about design and construction challenges of temporary walls in this project, and present different solutions that MSE temporary walls offered to overcome these challenges. In addition, several specific cases will be presented such as a temporary structure supporting a temporary 83 m span modular steel bridge, and a 13 m in high temporary wall utilized as a bridge during construction phasing.