Costain has announced that its joint venture with Vinci Construction Grands Projets has been awarded the contract by Scottish Water to construct the Shieldhall Tunnel in Glasgow. The contract, with a value of €105M, covers the construction of two shafts with a diameter of 15m each and a depth of 20m, a 300m long cut-and-cover trench and a 5km tunnel with an internal diameter of 4.70m.
The technique used will be that of a mud pressure type tunnel boring machine, one of the company’s areas of expertise.
The Shieldhall Tunnel will be Scotland’s largest waste water tunnel and will form part of the biggest upgrade of Glasgow’s waste water network in more than a century. It 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.