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Trio show steely resolve

Spotlight

Skanska, Aarsleff Piling and Cementation Foundations have just completed piling for a new £100M steel manufacturing plant on the site of a former steel reinforcement producer in Tremorfa, Cardiff.

Allied Steel and Wire was a major source of steel reinforcement for the construction industry before going into administration over two years ago. The Celsa Group took over the plant from the receiver and has now demolished part of it to build a new melting shop.

Turnkey contractor SMSDemag awarded Cementation the £1.2M foundations contract to install a combination of 681 CFA and 1,022 precast concrete driven piles. Cementation negotiated a £750,000 subcontract with Aarsleff Piling to supply, handle, pitch and drive the precast concrete piles.

The CFA piles are in three diameters - 600mm, 750mm and 1,050mm - and they have been designed to compress working loads ranging from 1,500kN to 4,700kN. There are also three types of Aarsleff's 300mm square precast piles, with compressive working loads from 210kN to 1,000kN.

All the piles have to accommodate a minimum of 10% of their allotted compressive loading in tension, while some are designed for even higher tension loading.

Some 600mm CFA piles have 550kN tensile loading, increasing to 620kN tension on the 750mm piles. The concrete piles also have to absorb lateral loads ranging from 25kN to 55kN.

Cementation started on site at the end of October 2004, first building a working platform to accommodate five piling rigs: a Soilmec R622 and a pair of Junttan PM26 CFA rigs, as well as Aarsleff's Banut 700 and Junttan PM20 self-erecting, fixed leader, drop hammer rigs.

The piles are located in singles, pairs and clusters, ranging from eight to 30 piles and, in some cases, CFA and driven piles are close together.

The piling has now been completed and main civils contractor Laing O'Rourke has been on site since February.

Spanish contractor Tauxme will soon begin erecting the building's structural steelwork.

Celsa's new Melt Shop is expected to employ about 400 people when it goes on stream during the first quarter of 2006.

www. aarsleff. co. uk

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