Scottish Water reached a key milestone in the construction of the Shieldhall Tunnel in Glasgow. Bachy Soletanche, the UK company contracted last June by the JV VINCI Construction Grands Projets and Costain, installed 675 piles in just three-and-a-half months for the new tunnel. The works included the construction of Cased Secant Piles (CSP) for the first shaft of the tunnel, the service chamber and also the TBM launch chamber, along with 400m of Continuous Flight Auger (CFA) adjacent piled walls for the cut-and-cover section of the tunnel. The reinforcement cages placed in the piles each weighed approximately a ton each and were more than 15m long and were filled with 9 m3 of concrete.
The next stage of the project is for the 150m-long Herrenknecht slurry TBM to be assembled and to start work. The 5km Shieldhall Tunnel is 4.65 m in diameter, and will run between Craigton Industrial Estate and Queen’s Park. The tunnel will improve water quality and reduce flooding issues at key locations in the area which is served by the Shieldhall Waste Water Treatment Works. The upstream end of the tunnel – shaft four – will connect into an existing chamber at Queen’s Park using pipe jack techniques, while the Jura Street end will be connected to Shieldhall via a 2m diameter cut and cover tunnel.
Work on the project began in October 2014 and is due to be completed in early 2018. Click here and uk/78 for the tunnelbuilder archive. Visit http://www.scottishwater.co.uk/, http://www.vinci-construction-projects.com/, http://costain.com/ and http://www.bacsol.co.uk/. 47/15.
