The shortlisted candidates for the New Installation Water & Wastewater award, in no particular order, are;
And the winner is….
O’Connor Utilities Ltd / Irish Water / Ervia – Cork Harbour Main Drainage System
The Cork Harbour Main Drainage System project was developed to end the discharge of raw sewage into Cork Harbour and to achieve compliance with the Urban Wastewater Treatment Directive. 14 Pumping Stations and 27km of sewers have been installed to collect 40,000 wheelie bins per day of sewage for treatment at the new Shanbally Wastewater Treatment Plant.
O’Connor Utilities were contracted to design and install two parallel kilometre long x 500mm diameter pipelines beneath the Rive Lee estuary by HDD to connect 20,000 properties on the east side of the harbour to the treatment works on the west.
McAllister Group / Tideway Tunnel (Ferrovial) – Chelsea FLUME, Thames Tideway Tunnel
The project scope was to introduce a temporary flume structural liner for Thames Tideway Tunnel into the Low Level No.1 (LL1) Thames Water sewer on Chelsea embankment to safeguard the asset during the construction of a new weir chamber connecting on to the main Tideway tunnel beneath the flume.
The LL1 sewer was exposed to the springer level where the temporary support cage / leakage liner was removed. After which the mild steel flume was installed and supported by 16no. rods to a top beam at ground level.
The LL1 sewer is a 2084mm diameter circular brick sewer originally constructed by cut-and-cover methods in the late 19th century. Cover to the sewer is approximately 8.5m below road level.
The mild steel flume installed had an internal diameter of 1.9m and spanned approximately 14m of the weir chamber shaft.
Barhale – Mill Harbour Sewer Diversion
Civil engineering and infrastructure specialist Barhale was engaged by Ballymore to design and build an adoptable solution facilitating the construction of 766 new homes in Canary Wharf. The initial client solution encroached within the DLR footprint. Barhale’s innovative solution reduced risk, time and cost. The location entailed working outside of the footprint of the future apartment blocks’ site to allow the diversion of an existing 1600mm sewer connecting to the existing Thames Water sewer. Additional challenges were presented by the need to negotiate the other utilities, telecoms and heavily-used roads supporting one of the world’s major financial centres.