UTILITIES | WATER & SEWER TUNNELS


As previously noted, hydrogen sulphide (H2S) is a


major cause of problems for the UK’s sewer network. At our project at Potters Way, working as part of Anglian Water’s @one Alliance, significant corrosion of the original concrete pipes had been caused by H2S released from the sewage flows. Investigations revealed that 430m of concrete pipe


and 85m of GRP pipe needed to be renewed. We were able to come up with a solution that allowed the pipe to be refurbished without having to excavate and replace the entire pipeline. Traditional diversion and replacement would have had


a major impact given the site was alongside a busy road and within an environmentally sensitive area. By using Cured-in-Place Pipe (CIPP) relining and working within live flows, we were able to reduce project costs and the level of disruption to residents and road users. It is anticipated that the works carried out will


prolong the life of the sewer for at least another 50 years.


At Whitlingham, an 11m-deep, 1676mm-diameter


brick sewer had been attacked by H2S, causing bricks to become dislodged. Before work could begin, innovative CCTV technology


was used to provide a full 360º sonar and laser scan profile of the sewer. The survey found the sewer was up to 45% full of debris, with over 135m3


Top left: CIPP relining and working within live flows at Potters Way Top right: One of the pipe bridges installed to mitigate disruption Above: Installing the flume inside the Victorian Low-Level sewer within the Thames River Wall at Blackfriars


24 | September 2024


A steel shield was installed ahead of the GRP pipes providing a safe area for the workforce to remove the debris whilst simultaneously pipejacking without being put at risk of a potential collapse.


requiring removal.


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