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    Portsmouth City Council


    Portsmouth, Hampshire



    Knights Brown’s works comprised the investigation, design and refurbishment of a steel and concrete road bridge over Langstone Harbour, a designated SPA, SSSI and RAMSAR. This dictated both when and how the works could be undertaken.

    The bridge is one of only three major routes on and off Portsea Island and the northern part of Langstone Harbour is one of only a few sites in northern Europe that is key for over-wintering birds.

    Due to the potentially devastating impact to the road network and the numerous environmental and ecological constraints the scheme underwent a two-stage procurement model with a six-month collaborative planning, design and approvals phase between Knights Brown, Portsmouth City Council, Ramboll and our specialist painting subcontractor, SCA.

    We worked with Portsmouth City Council’s team to develop safe and effective methods to undertake the bridge inspections with respect for the tidal nature of the works and available working windows. Bird netting was erected under the bridge to prevent any birds or bats roosting/nesting prior to the works. We produced the methodology for all the MMO licences and relevant environmental consents, which were approved at first time of asking.

    The main elements of the construction work that followed included the erection of scaffolding and encapsulation to the underside of the bridge to prevent contamination to Langstone Harbour, grit blasting of steel beams and preparation of steelwork, structural steelwork investigation works, application of a corrosion resistant paint system, sealant to the joints and bridge inspection and testing works.

    The project won a 2018 National Considerate Constructors Scheme Bronze Award.

    our sectors

    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

    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

    Malcolm & I would like to thank yourself and Guy for working with us and our design team in delivering a superb finished product for FloPlast that we are very proud of and which has been much admired by our customers on site visits.  So far so good, we are finding our operational feet on the site and it all appears to be working well.

    - Bryan Lynch, Floplast