Barhale assists in major rehabilitation

As part of Anglian Water’s @one Alliance, Barhale has helped to rehabilitate sewer pipes across East Anglia in England.

According to WWTonline, Barhale has helped to restore sewer pipes in East Anglia as part of a £4.5 million (US$5.8 million) project that spanned 22 weeks and delivered through the @one Alliance, a collaboration of consultants and contractors.

Barhale faced the challenge of the replacement of 360 m of damaged brick sewer, which serves the Whitlingham Water Recycling Centre and had dislodged bricks due to a hydrogen sulphide attack.

To eliminate future hydrogen sulphide risks, a glassfibre reinforced plastic (GPR) pipe jack solution was chosen to extend the sewer’s lifespan for another 150 years.

Prior to work commencing, a CCTV survey demonstrated that the sewer was 45 per cent full of debris with more than 135 m3 requiring removal; a steel shield was installed ahead of the GRP pipes to remove the debris while simultaneously pipe jacking.

To carry out the works 750 m of temporary 1,000 mm diameter steel overland pipes were used with a temporary pumping station that pumped the existing sewage flow with two 5.5 m high ‘pipe bridges’ to minimise disruption.

@one Alliance Construction Manager Colin Handley said the it was a testing yet successful project.

“Our main challenge has bee the over-pumping situation, as we are dealing with a flow of 2,200 L of wastewater per second with only a five-hour window to make our connection,” said Mr Handley.

“As you can imagine, getting that right required a great deal of planning and very precise execution. I’m pleased to say that we are more than satisfied with the result.”

For more information visit the Barhale website.

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