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Skewed Box Culvert Addresses Challenging Site Conditions

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The Regional Municipality of York (located north of Toronto, Ontario) is investing in building a safe, efficient and reliable Regional transportation network for all travelers. To support growing communities and enhance roads and transit, construction is planned and underway at over 80 locations across the Region. Part of this investment is transforming Major Mackenzie Drive from Highway 50 to Highway 400 in the City of Vaughan. This three-year project will widen the road to six lanes with additional improvements, including sidewalk, multi-use path, storm sewers, street lighting and landscaped medians.

The Major Mackenzie Drive extension project is split into four sections. The third section, which runs from Huntington Road to Islington Avenue, was primarily realigning Major Mackenzie Drive to eliminate the jog at Highway 27. One of the key structures in this section is a large span, over 9m, skewed (21 degrees) box culvert.

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Dufferin Construction was the general contractor for this project and awarded the precast concrete skewed box section to DECAST Ltd. The site requirements provided some significant challenges.

This culvert would be required to support up to 8m of earth cover. The property limits required a skew of 21 degrees on the ends of the culvert. The technical/engineering team at DECAST worked closely with Dufferin Construction, AECOM and York Region to provide a structure that met these challenging requirements.

The resulting design was a skewed box culvert with a 9148mm span, 2440mm rise box culvert for installation just east of Highway 27. To complete the structure, 77 pieces were required, with each piece weighing in at 39,100kg. The significant dead load and the large span resulted in a roof/bottom slab of 550mm in thickness.

All logistical requirements were handled through DECAST Ltd. in coordination with Dufferin Construction with respect to the installation. All 77 pieces of this culvert structure were installed in five days which highlighted the accelerated construction capability of using precast elements.

The Regional Municipality of York consists of nine local cities and towns and provides a variety of programs and services to 1.2 million residents and 54,000 businesses with 650,000 employees. More information about the Region and Transportation Services is available at www.york.ca.

Gary Leonard, C.E.T., rcca.
Construction Administrator – Major Mackenzie
Extension Project (Section 3)

York Region Transportation Services,
Capital Planning and Delivery

Precast Producer: DECAST Ltd.



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