Scottish Water is shortly expected to announce a joint venture of Costain and Vinci as preferred bidder to design and build a 3-mile long sewer tunnel in Glasgow. The 4.5 m-diameter Shieldhall tunnel in Glasgow will be driven at depths of between 10m to 30m and will run through an area of old mine workings, raising potential technical problems. The old workings will be grout filled before tunnelling can start. The Costain/Vinci team will excavate six shafts for the tunnel drive, which is expected to advance at 10 m/day. They will then need to connect the tunnel at both ends to the existing sewer network. The wastewater tunnel in the south of Glasgow forms part of the biggest upgrade of the city’s waste water network in more than a century and will run between Queen’s Park and Craigton Industrial Estate via Pollok Park and Bellahouston Park. For further information click here and uk/78. Visit https://www.competefor.com/blog/costainvinci-team-wins-100m-glasgow-sewer-job/. 30/14.