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PENNINE VIBROPILING has been awarded a £291,000 contract for ground improvement work to form foundations for a bridge on the new A130 link from the A127 in Rayleigh to the A12 at Chelmsford in Essex.

Working for main contractor Laing, Pennine will use two types of ground improvement techniques for the foundations of an embankment being constructed for the Ashdale Bridge.

More than 3400 stone columns, up to 7m deep, are being installed using Pennine's bottom feed rig. Because of the density of the surface layer the initial 3m of each hole is being prebored using Pennine's new Strata-Max piling rig.

Where there is a 7m height restriction because of overhead power lines the company is using its Loflot, one of its vibro rigs that has been specially adapted for working in confined spaces.

To increase the rates of consolidation settlement, more than 3700 wick drains are also being installed.

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