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Contractors World 2010 Volume 1 Issue 7
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WALES - Remedial coastal defences after 100 years . . . .

Aarsleff, using one of its Banut 700 self erecting piling rigs and working between the tides, installed the 5 m long piles up to 3.5 m into the beach sand. Jones Bros put the groyne piling out to open tender and  Aarsleff Piling was successful with its approximate $95,000 submission. Aarsleff had previously worked for Jones Bros installing piles for the Tullo wind farm in Scotland.

The specialist piling contractor had also installed all the timber groyne piles on the smaller, but similar Atkins designed scheme at nearby Aberaeron.

Aarsleff, using one of its Banut 700 self erecting piling rigs and working between the tides, installed the 5 m long piles up to 3.5 m into the beach sand.

The new groynes are spaced 50 m apart along the beach and each row of groyne piles was driven in a straight line at 2.5 m centres down the beach to a ±50 mm position tolerance. The top levels of the piles gradually reduce towards the sea with the outermost piles upstanding by about 1.5 m.

Aarsleff had to drive almost 400 greenheart piles and installed them at an average rate 30% faster than its contract estimate. “The job went better than expected and we finished the groyne piling about one to one and a half weeks ahead of our programme,” says Aarsleff project engineer Dan Broadley.

On completion of the piling for each groyne, Jones Bros followed on behind with a team bolting on new greenheart waling bars and planks to the faces of the timber piles. “The groyne piling has gone very well and Aarsleff finished in mid June and ahead of schedule,” says Jones Bros site agent Dafydd Elis. “They have worked for us before on a wind farm project and they did the piling for the similar sea defence scheme down the coast at Aberaeron, which I understand also went very well.”

On completion of the piling for each groyne, Jones Bros followed on behind with a team bolting on new greenheart waling bars and planks to the faces of the timber piles.

Jones Bros also has to build two new rock groynes, place some rock revetment and rebuild the slipway and access steps, including the concrete steps along the length of the promenade. In addition about 15,000 t of sand and gravel has to be placed as beach replenishment in the area between the new main breakwater and sea wall, prior to Jones Bros completing the Tywyn sea defences scheme on schedule in September 2010.

Aarsleff
Banut (ABI GmbH)

 

 

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