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Contractors World  - UK & Ireland
2013 Vol 3 No 5
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Piling Goes to Plan on King’s Cross Development - Page 3 of 3


Parts of the historic gas storage tanks will be intrgrated into the new accommodation units

Simultaneously a second rig, a 75 t. Mait HR 260, using the rotary bored and cased piles methods, was installing the 271 rotary bearing piles, 750 mm diameter, typically 26.0 m long with low level cut-offs.

Temporary single wall casings were used through some 3 m made ground and river terrace deposits and sealed into underlying London Clay. Residue of pile length was drilled with conventional open auger techniques into stable cohesive London Clays to design toe level without bore support.

Prefabricated steel pile cages up to 30.0 m long were installed, primarily due to tension loadings induced by ground heave associated with basement excavation.

Because of the need to a continuous supply of concrete at times, the contractors used their own Schwing Stetter 1250 model pumps using concrete supplied by Hanson from a nearby batching plant.

All piles were integrity tested using NDT instrumentation. Sonic logging tubes were also inserted in to the large 1,500 mm pile. Associated Works

The retaining walls and structural piles was the main part of the £1.05 million contract for P J Edwards, but there were also other associated works.

These included a number of smaller diameter piles outside of the retaining wall and piling foundations for two tower cranes.

There were 3 maintained load tests for bearing piles to validate design Factor of Safety of 2.2 adopted for works (in accordance with current LDSA design guidance notes).

The geotechnical design was verified by the satisfactory static testing of three of the piles up to 5,000 kN.

All piles were integrity tested using NDT instrumentation. Sonic logging tubes were also inserted in to the large 1,500 mm pile.

Because of the need to a continuous supply of concrete at times, the contractors used their own Schwing Stetter 1250 model pumps using concrete supplied by Hanson from a nearby batching plant.Job Done To Main Contractor Satisfaction

Despite challenging weather conditions at time, the 14 people on site successfully completed the 10 week project, two weeks ahead of schedule.

The company is currently negotiating for other works associated with the massive development that will transform what had become a brownfield wasteland to a all embracing community development.

The project required 265 tonnes of steel and 4,410 m³ of readymixed concrete.

For cased rotary bearing piles the materials quantities split is 192 t of steel / 2900 m³ concrete; for CFA contiguous bored pile retaining wall materials is 70 t steel / 1400 m³ concrete; for single large diameter 1500 mm rotary pile constructed under bentonite support fluid the material used was 3 steel / 110 m concrete.

Click here for more information:
>>> P J Edwards Co (UK) Ltd
>>> Llamada Piling Rigs
>>> Mait Piling Rigs



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