Strabag is tunnelling under Toronto to enhance wastewater management

By Daniel Brightmore
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Strabag, has won a€80mncontract to build phase 2 of new integrated pumping station for the Toronto Wastewater Treatment Plant. The Austrian construct...

Strabag, has won a €80mn contract to build phase 2 of new integrated pumping station for the Toronto Wastewater Treatment Plant.

The Austrian construction services group will build deep concrete shafts, chambers and feeder tunnels for the pumping station which will allow the underground transport of wastewater to the Ashbridges Bay Treatment Plant. 

“The pumping station is part of a larger infrastructure programme aimed at increasing wastewater capacity in the event of heavy rain and so improve the water quality of Toronto’s waterways and Lake Ontario,” explained project manager Simon Köck.

The main part of the project involves two large-scale shafts: one 68 m deep with a diameter of 27 m and another 27 m deep with a diameter of 32 m. Including five smaller shafts, this results in a total of 153 m of shafts to be built. The shafts will be linked to feeder tunnels with a total length of 445 m, with a rock tunnel section as well as a parallel pressure pipe in an open cut close to the surface.

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The pumping station for the city of Toronto is part of a fourteen-year history in Canada. “Our most prominent reference project in tunnelling must certainly be the Niagara Tunnel, a 10.1 km long water diversion tunnel with a diameter of 14.4 m, built using one of the world’s largest hard rock tunnel boring machines,” said Thomas Birtel, CEO of Strabag SE. 

The tunnelling unit is currently working on a railway tunnel in Toronto which is expected to be completed in 2021. 

Strabag SE is a European-based technology group for construction services that span all areas of the construction industry and covers the entire construction value chain. 75,000 employes are engaged on projects generating annual output volume in excess of 
€16bn.A dense network of numerous subsidiaries in many European countries and on other continents is helping to expand our area of operation far beyond the borders of Austria and Germany.

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