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Swift success for cofferdam piles

Irish contractor Ascon, part of the Dutch HBG group, drove 90 pairs of steel sheet piles for a 33m diameter cofferdam in just eight weeks as part of the construction of a new waste water pumping station in Cork, Southern Ireland.

The firm used a BSP HH357 Mk V hydraulic hammer in 7t mode to drive the Larssen LX32 X, 23m long steel sheet piles to 21.5m, through 4m of soft ground and dense gravel below under an Ir£7M (£5.8M) piling contract. BSP says the hammer's hydraulic actuator system means it is easily controlled and efficient, allowing the drop weight to fall under the effect of gravity with virtually no resistance from the hydraulic circuit.

A joint venture of Ascon and Edmund Nuttall is also building the £12.5M, 288m long tunnel as part of the scheme.

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