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CORUS HYDROBARRIER has completed the design, supply and installation of sealed sheet pile retaining walls for a 280m2 basement on a residential extension in central London.

The site was very small and close to other properties, which meant noise and vibrations had to be kept to a minimum. Its cramped nature also meant careful sequencing of construction was needed to minimise congestion on site.

Developed by Corus, the Hydrobarrier system combines pile design with the most appropriate sealant system. Corus has a range of approved sealant systems to suit the grade of watertightness required.

For this job, the Larsson LX20 and LX25 sheet piles had a temporary sealant applied to the interlocks before being delivered to site.

This provided short-term watertightness to cope with a layer of water-bearing gravel. In the permanent condition the pile interlocks will be welded up to make them impermeable.

The piles were driven through the medium dense gravels and into the underlying London Clay to up to 11m. In 13 days, 860m 2of piles were installed using silent driving techniques, slashing almost two weeks off the contract programme.

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