MISSISSAUGA, ONT. — It took LIUNA Local 183 crews 55 hours straight under a busy highway to build a new underpass on the Hazel McCallion LRT line in Mississauga, Ont.
Work on the underpass, which was installed at Hurontario Street and the Queen Elizabeth Way (QEW), was completed late last year. The line is also known as the Hurontario LRT.
Crews used a unique box jacking technique on the project. It was the first time the technique has been used in Ontario. Hydraulic jacks were used to push a large concrete structure, a push box weighing more than 6,000 tonnes, into place.
The QEW push box will be a permanent underpass for northbound Hurontario traffic, allowing space for the Hazel McCallion Line tracks through the existing underpass along with the southbound Hurontario traffic, states a Metrolinx blog.
Although the new passageway was being built under an active highway, the method significantly reduced the impact on the traffic above as the crew was able to keep traffic moving by diverting it to two lanes in each direction onto the off and on ramps at Hurontario before returning to the highway.
The width of the box accommodates three lanes of traffic (including a left turn lane) and a multi-use path for pedestrians and cyclists. It also fully supports seven lanes of highway traffic on the QEW, including road shoulders, the blog states.
The work was done in addition to other work to rehabilitate the existing QEW structure, including the installation of a new storm sewer.
A QEW Push Box Time Lapse video can be viewed here.
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