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SEEKING SECANT

Foundation contractor Expanded Piling has just taken delivery of a new Soilmec CM120 rig. The new machine will allow Expanded to move into the CFA market, in particular for the construction of secant piled walls. The rig, which is fitted with Soilmec's cased flight auger pile system, can form up to 1400mm diameter piles down to a maximum of 30m, with increased accuracy and a better quality finish. Expanded believes the new rig will allow the firm to build circular secant walls for access shafts for tunnelling more cheaply than using precast segments, particularly where groundwater and unstable soils are encountered. Expanded recently installed around 800 piles on the site of a demolished power station in Birmingham. The new system allowed work to be carried out without removing the existing foundations and other underground obstructions, minimising the amount of material that had to be removed and reducing construction costs.

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