A marathon ten-hour concrete pour recently completed Kvaerner Construction’s innovative solution to the potential problems of a high water table at the waste water treatment works it is building for Yorkshire Water near Hull.
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Following a comprehensive geotechnical survey which revealed the full extent of the high water table, strong water pressures and underlying chalk aquifer, Kvaerner Construction decided to pin the plant’s massive inlet pumping station shaft into the ground with tension piles almost 50 metres below surface level.
Some 475 cubic metres of concrete was then pumped in to form a base for the shaft - which is 24 metres in diameter, 25 metres deep and formed by a diaphragm wall founded 30 metres below ground level - to anchor it to the tension piles preventing the water pressure moving the shaft.
Working for Yorkshire Water Services under its Preferred Contractor Framework Agreement on the £54 million project, Kvaerner Construction’s contract includes designing, building, testing and commissioning the works.
When completed at the end of 2000 the plant and its associated sewerage system will stop outdated and unsatisfactory discharges of raw sewage into the River Humber. It will serve a population of more than one million people.
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