Innovation Summer 2024

PROJECT HIGHLIGHTS 2023•2024

Photo submitted by COWI

MACKAY BRIDGE OSPD REPLACEMENT

SHORELINE TRAIL SANITARY SEWER UPGRADES There are three components of the Shoreline Trail sanitary sewer upgrades in Port Moody, BC. First is a cured-in place pipe rehabilitation of 1,550 m of 600-mm diameter low-pressure sanitary force main and 1,600 m of 400-mm diameter gravity sewer through Shoreline Park. Second is the replacement and widening of a 3-m wide paved multi-use path. Third is the park improvement upgrades. The project area includes high-value environmental, archeological, and public amenity features. Impacts to these features were minimized by limiting excavation wherever possible. Trenchless pipe rehabilitation dramatically reduced excavation volume, tree removals, archaeological impacts, and greenhouse gas emissions compared to open cut trenching. The low-impact path is largely built on the existing alignment to minimize tree impacts and includes a drain rock subbase to maintain diffuse drainage and tree root aeration. This project is the first large-diameter pressure sewer lining in BC. Company: Kerr Wood Leidal Associates Ltd. Participants: Chris Madelung, P.Eng.; Colleen O’Toole, P.Eng.; Sam Eichenberger, P.Eng.; Dan Brown, R.P.Bio; Sonya Oetterich, R.P.Bio; Karl Mueller, P.Eng.; Mike Homenuke, P.Eng.; Carlye Ip, EIT; Brandon Vollmer, EIT; Peter Tapp; Marco Rota; Steve Bozzetto; Tiffany Soh; GeoWest Engineering; Diamond Head; Hapa Collaborative; WSP.

The Mackay Bridge, located at the Halifax Regional Municipality, saw the replacement of two Orthotropic Steel Plate Deck (OSPD) panels to maintain its structural integrity and serviceability. Opened in 1970 and facilitating over 60,000 daily crossings, this project was critical for the bridge, which spans Halifax Harbour, connecting Dartmouth and Halifax. The COWI North America team devised a modular design for panel prefabrication, which ensured efficient risk management and minimized impact during the strategic closure hours between 7 p.m. Friday and 5:30 a.m. Monday. Innovative erection methods, involving crane lifting from deck level with a below-deck access platform, were used to protect the public and maintain traffic flow. The complexity of the work and its careful execution underscores the bridge’s importance to the region’s infrastructure and economy, and will ensure its continued role as a vital transportation artery in the region. Company Name: COWI North America Participants: Darryl Matson, P.Eng.; Jorge Perez Armino, P.Eng. (NS); Dillon Betts, P.Eng. (NS); Justin Thomas, EIT (NS); Claus Frederiksen, PE; Aaron Ferguson, P.Eng. (NS); Sabine Wilkie, P.Eng. (NS).

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Summer 2024

Innovation