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    Galliford Try for Southern Water


    Southampton, Hampshire


    Combined value £4.6m

    Near identical in scope, these two projects each involve the construction of four reinforced concrete chambers to house UV equipment that will treat final effluent prior to it being discharged into Southampton Water.

    Millbrook was the first to get underway with Slowhill following on some four weeks later.

    Each chamber measures 6m x 6m x 5m high, with about three meters buried below ground. To construct these safely, we have installed temporary works cofferdams. The frames were constructed by our directly employed workforce. The sheet piles, ranging in length from six to nine metres, were efficiently installed with a 35T excavator and Movax side gripping vibrating pile driver.

    Once constructed to ground level, the structures are backfilled, allowing the removal of the cofferdam frames and sheet piles.

    A further two meters of wall is then constructed to each of the four chambers to reach finished level.

    Once complete they undergo water tightness tests prior to installation of the M&E (pumps, pipework, UV lights) by Galliford Try. Knights Brown will then install the large ductile (1200mm dia) iron pipework connecting the structures to the wastewater infrastructure.

    Having the two projects running concurrently has enabled the sharing of ideas and lessons learnt, as well as the movement of our operatives and trades between the two sites as demand dictates.

    our sectors

    Knights Brown performed very well on this project in terms of quality, cost and time. The team worked very well as part of an integrated delivery team with the Employer to the benefit of the project

    - Marc Bryan, Portsmouth City Council

    Knights Brown was a great client to deal with. We felt from the very outset that they worked with us rather than for us, demonstrating real collaboration in order to minimise disruption to the port. The works were also delivered through a very challenging time, with the latter stages coinciding with the COVID-19 pandemic. Their approach to this was thoroughly professional, with health and safety the primary consideration. Working practices were strictly amended and monitored, with the project completed to the satisfaction of all involved.

    - Anisa Koci Port Master Plan Project Manager at Portsmouth International Port

    This complex and challenging project was a collaborative undertaking from the outset. Combining two projects was inspirational, saving not only money but diverting 22,000m3 from landfill. Some extremely innovative tools and methods were used to demolish the pier, recover material and to achieve the lowest environmental impact on one of the most environmentally designated places in the UK.

    - London and South East Constructing Excellence Awards judging panel on Phase 2 of the North Portsea Island CFERM