This week NCE begins its countdown to the inaugural International Tunnelling Awards with a look at the two entries shortlisted for Environmental Initiative of the year award.
Project: Hobsons Bay Sewer & Stormwater Tunnel, New Zealand
Through research and development of product and dosage equipment, the project team was able to replace all the traditional steel reinforcement within the concrete tunnel lining segments with steel fibre reinforcement.
The project’s ultimate client, Watercare Services, commissioned the project to replace ageing, existing overground piped infrastructure with a tunnel.
This produced annual pump power savings of around 3000MWh, equivalent to saving of 690t of CO2 per annum or taking 150 cars off the road.
This project was the first use of an EPB TBM tunnel and the first in New Zealand to totally replace reinforcement bars with steel fibre reinforcement.
- J Murphy & Sons
Project: West East Link Main (WELM), UK
Murphy is the principal contractor for the West East Link Main, a £125M pipeline for United Utilities, acknowledged as one of the most ambitious pipeline projects in the North West.
The firm is design and build contractor for the 54.5km, 1.2m diameter pipeline which is to carry potable water between Prescot Reservoir near St Helens, to Woodgate Hill Reservoir in Bury.
Two significant environmental initiatives were a switch from open cut construction to microtunnelling in an area where the pipe runs down an unstable, contaminated slope. The second is the production of, and adherence to, a Material Management Plan.
This ensured all excavated material proposed for reuse was suitable and not classified as waste.
- The International Tunnelling Award winners will be announced at a lunch in London on 8 December, following the two day NCE Tunnelling 2010 conference. Call Rosalind Brewster on 020 7728 5280 for a joint booking discount for the awards and conference.