RENEWING INFRASTRUCTURE - WITHOUT WIDESPREAD UPHEAVAL
Anglian Water have completed a 4.2 million programme of drainage rehabilitation in Sudbury, the ancient Suffolk market town where Gainsborough was born. Due to environmental sensitivity, CIPP contractor Insituform Technologies scheduled work in close collaboration with the civil engineering contractor, Barhale Construction, to minimise disruption to the local community. The Insituform element involved CIPP lining of three kilometres of town sewers in three phases, over nine months.
Anglian Water have completed a 4.2 million programme of drainage rehabilitation in Sudbury, the ancient Suffolk market town where Gainsborough was born. Due to environmental sensitivity, CIPP contractor Insituform Technologies scheduled work in close collaboration with the civil engineering contractor, Barhale Construction, to minimise disruption to the local community. The Insituform element involved CIPP lining of three kilometres of town sewers in three phases, over nine months. The liners have an expected life of more than 50 years.
Sudbury, has narrow streets, meant for horse drawn carts not modern traffic. Conventional rebuild of the whole network would have caused severe problems. Many HGV movements would have been required for earth removal and to bring in aggregate for trench filling. This would have caused protracted traffic problems in the narrow streets, particularly as Sudbury has no bypass.
Sewers varied from 150 to 850mm in diameter with brick and clay construction used mainly in the older parts of town, with concrete used in the newer areas. Robot CCTV surveys showed that the sewer network was in poor condition. Common problems included joint failure and infiltration by tree roots with some collapses.
Insituform were asked to rehabilitate the recoverable sections of the network using their proven no-dig CIPP system. In total 28 sections of pipework were reinstated by Insituform, each insertion averaging 100 metres and with the longest run being 137 metres. Where new drainage was needed because of extreme dereliction, Barhale undertook the required civil engineering work. The two contractors scheduled work together to ensure minimal traffic disruption.
Hires picture for this text is on the web at www.ainsmag.co.uk/in198/3004in1a.htm
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