Sun. Jul 14th, 2024

Geotechnical work begins for detailed design of Quebec Bridge reconstruction

By Vaseline May30,2024

The Quebec government’s Île d’Orléans Bridge project is moving forward, with Fugro selected as lead geotechnical engineer for the detailed design phase of the project.

The lead bridge engineer on the Île d’Orléans Bridge project – a consortium between TYLin and Atkins Réalis – has awarded Fugro a contract for geotechnical interpretation and consultancy services.

Last month, the Quebec government awarded the design-build contract for the plan to Groupe Héritage Île-d’Orléans (GHIO), made up of Dragados Canada and EBC.

GHIO subsequently selected TYLin and Atkins Réalis to oversee the design of roads, interchanges, access spans, land structures, landscaping and related works, both on the mainland and on the island.

The C$2.76 billion (£1.58 billion) project involves the construction of a replacement bridge spanning 2.1km over the St Lawrence River, northeast of Quebec City.

It will consist of a 520 meter long northern access; a 790-meter-long three-span cable-stayed bridge; and a 740 meter long southern entrance. The superstructure of the bridge is continuous with two expansion joints, one at each abutment.

The bridge will be located 120 meters west of the old suspension bridge from 1935. The existing bridge will be demolished because it does not meet current design standards and cannot meet the needs of Quebec City users. On average, almost 12,000 vehicles use it every day, increasing to 15,000 in the summer.

As lead geotechnical engineer, Fugro will interpret the project’s geotechnical data, evaluate georisks and optimize the bridge foundation design.

Techniques such as non-linear numerical analyzes will be used to assess bridge performance under earthquakes, and Osterberg-Cell (O-Cell) technology for foundation load testing.

Fugro’s regional technical director for land site characterization, Thaleia Travasarou, said: “Our approach to land risk management will help deliver efficient geotechnical designs for this project and ensure a safe, cost-effective and resilient project that respects the cultural significance of the bridge as vital link for nature. both communities and trade.”

According to CBCQuebec Transportation Minister Geneviève Guilbault said the project’s high price tag was partly due to challenges on the ground. Construction crews will have to dig 80 meters deep into the sediment at the bottom of the St Lawrence River to secure the bridge’s foundations in hard rock, she says.

GHIO is currently working on obtaining all necessary environmental and heritage permits to start construction. The company will then continue with the installation of its offices and temporary locations.

Quebec’s Ministry of Transport and Sustainable Mobility plans the gradual commissioning of the bridge by 2028. In turn, the dismantling of the old bridge will be completed in 2033.

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