Articles & Case Studies

Hydrok MecMex screen installed in Truro for South West Water

Posted: Thursday 13th March 2014

As a part of the £3.5 million scheme to upgrade sewers in Truro Cornwall, Hydrok (UK) Ltd became involved with the design of a Combined Sewer Overflow working with South West Water H5O Alliance contractors, Balfour Beatty. The major construction of the CSO screening facility in Victoria Square Truro had a critical time constraint 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 the 15th November.

The original plan was to cast a large underground concrete 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 significantly reduced the chamber size and so minimised the site construction requirements and disruption in the City centre.

Hydrok’s solution reduced the overall size of the CSO through carefully reconfiguring the design of a prefabricated stainless steel package chamber. The complete assembly was manufactured within Hydrok’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 provided 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 require the construction of a concrete base prior to the chamber being lowered into a smaller excavation area then previously designed. The Hydrok package chamber incorporates one 1.5 metre 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 approved 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. We worked closely and quickly with the H50 project delivery team from Pell Frishmann and Belfour Beatty to develop a solution which provided all of the hydraulic requirements whilst significantly reducing the construction program. The delivery deadline was not negotiable and was a challenge from the start, however, this was achieved with two weeks to spare through good communication and effective engagement of all involved“

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