A joint venture between Costain and Vinci Construction Grands Projets has been awarded an £86M contract by Scottish Water to construct the Shieldhall Tunnel in Glasgow.
It will be Scotland’s largest waste water tunnel, 4.7m in diameter and 5km long, and will form part of the biggest upgrade of Glasgow’s waste water network in more than a century.
The tunnel will run between Queen’s Park and the Craigton industrial estate, and will resolve water quality and reduce flooding issues at key locations in the area served by the Shieldhall Waste Water Treatment Works.
Work will start in October 2014 and completion is anticipated in early 2018.
The new waste water tunnel will convey combined sewer flows and provide storm storage.
It will be constructed using a specially designed tunnel boring machine, which will follow a route from Queen’s Drive west under Queen’s Park toward Pollok Park, following the line of Titwood Road.
The tunnel will head northwards under Pollok Park and beneath the M77 and Tanna Drive and then beneath Bellahouston Park, under Paisley Road West and Jura Street before connecting to the existing network beneath Barfillan Drive, where the waste water will flow onwards to the Shieldhall WWTW.
It will be built from Craigton to Queen’s Park and will be built at varying depths along its route. The principal construction compound will be at Craigton Industrial Estate at the northern end of the tunnel.
Scotland’s deputy first minister Nicola Sturgeon, cabinet secretary for infrastructure, investment and cities, said: “The improvement of Glasgow’s sewerage network is essential to its future economic growth, a cleaner environment and to resolve long-standing flooding issues.
“In February 2013, we announced a £250m package of investment that will transform an ageing network into a modern and sustainable drainage network fit for the needs of 21st century Glasgow. The Shieldhall tunnel is an essential part of this project.
“Investment such as this ensures that Scottish Water can continue to deliver excellent services to the people of Scotland. By 2015, Scottish Water will provide one of the best value for money water and sewerage packages in the UK to the continuing benefit of households and businesses throughout Scotland.”