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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.

If you have project news you would like featured in Trenchless International contact Managing Editor Chloe Jenkins at cjenkins@gs-press.com.au 

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