Water and Effluent Treatment Magazine
Issue link: https://fhpublishing.uberflip.com/i/256132
As A pArt of the £3.5M scheme to upgrade sewers in Truro, Cornwall, Hydrok (UK) became involved with the design of a Combined Sewer Overflow (CSO) work- ing with South West Water H5O Alliance contractor Bal- four Beatty. The major con- struction of the CSO screen- ing facility in Victoria Square Truro had a critical time con- straint for Balfour Beatty as all work had to be completed with minimal disruption to the busy town location and in time for the annual Truro Festival of Light Christmas festivities on November 15. The original plan was to cast a large underground con- crete chamber to provide the long weir length requirements necessary to accommodate tight hydraulic restrictions within the city's sewer system. This would create the need for major excavation work and cause disruption to the business retail units around the square when timing was paramount to the completion deadline. Hydrok's solution signifi- cantly reduced the chamber size and so minimised the site A project to install a CSO in Truro had to be completed with minimal disruption − and before the city's before Festival of Light. CSO sees the light 12 | WET News | February 2014 | CaSe Study: CSOs ber incorporates one 1.5m long Hydrok MecMex CSO screen whilst still maintaining the overall weir length with a clever reconfiguration of the screen design to provide a double sided overflow whilst incorporating the required emergency bypass weirs. The pre-manufactured package chamber solution required less than 50% of the original excavation footprint which reduced the disruption time and risk to the public in the busy City location. The design was completed and ap- proved by the Client in early September with manufacture and installation completed within 7 weeks, 2 weeks prior to the critical November 15th deadline. Dave Armstrong, director of Hydrok, said: "This project demonstrates how detailed consideration of alternative methods of construction can benefit project program, cost, environmental impact and good engineering design." Armstrong continued: "We worked closely and quickly with the H50 project deliv- ery team from Pell Frishmann Consultants and Balfour Be- atty to develop a solution which provided all of the hy- draulic requirements whilst significantly reducing the construction program. The delivery deadline was not ne- gotiable and was a challenge from the start, however, this was achieved with two weeks to spare through good com- munication and effective en- gagement of all involved." ■ SUPPORTING ASSOCIATIONS: ORGANISED BY: OFFICIAL MEDIA PARTNERS: ● New for 2014! Top level sessions on the keynote stage including: - e Water industry: 25 years since privatisation, with contributions from Ofwat and DEFRA - Delivering innovation through alliances and partnerships in AMP6 - What does the opening up of retail competition mean for the UK water industry? ● Practical case-study and discussion led seminars –the latest advice, updates and best practice that you can use in your working environment ● New for 2014! Technology Pitch product showcases – your chance to see the most innovative new products ● More than 250 exhibiting companies offering the latest range of sustainable and resource effi cient solutions – fi nd the products and services to help drive your organisation forward ● Networking opportunities – with thousands of industry professionals all in one place, take the opportunity to meet your peers and make new business contacts SHOW FEATURES INCLUDE: For more information on exhibiting or sponsorship contact Rachel Lyon +44 (0)1342 332097, rachael.lyon@fav-house.com Pre-register for FREE entry now at www.sustainabilitylive.com ● WATER TREATMENT TECHNOLOGY ● WATER MANAGEMENT ● INDUSTRIAL EFFLUENT ● www.iwex.co.uk @Suslive linkedin.com/SusLive facebook.com/Sustainabilitylive PART OF: THE LEADING EVENT FOR WATER & WASTEWATER MANAGEMENT IWEX-visitor-A4.indd 1 13/12/2013 09:56 the prefabricated stainless steel package chamber was reconfig- ured construction requirements and disruption in the city centre. The solution reduced the overall size of the CSO through carefully reconfigur- ing the design of a prefabri- cated stainless steel package chamber. The complete assembly was manufactured within Hy- drok's facilities in Cornwall to not only include the screen but also the necessary internal details such as the required benching and overflow weirs. These features were also pro- vided and finished in stainless steel prior to the delivery of the complete assembly to the site. This further minimised civil construction site works, which then would only re- quire the construction of a concrete base prior to the chamber being lowered into a smaller excavation area then previously designed. The Hydrok package cham- Less than half of the original excavation footprint was needed, reducing disruption in truro Only a concrete base is required before the chamber is lowered into position