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CONTRACTS

MANUFACTURING SUPPLIER Groundforce Shorco has supplied large proprietary hydraulic shoring struts for use on a mixed use development in north London.

The company provided five custom built MP250 hydraulic struts, measuring 1.2m diameter and up to 43m long, to support a basement excavation on the site of developer Sager's new mixed use scheme in Hampstead comprising 72 apartments, a gymnasium and retail units over two levels of car parking.

Occupying a roughly triangular excavation 93m in length and up to 59m wide, the sloping nature of the ground across the length of the site meant that two storeys are below ground. Groundforce specified a combination of its MP125 and MP250 heavy duty hydraulic struts to support 7m steel sheet piles lining the excavation.

'The longest, single span is 43m and for this we originally specified 250t capacity MP250 struts with standard 600mm tubular extensions, ' says the company's design office manager, Neil Bleakley.

'However, these struts would have required central vertical supports to maintain sufficient axial capacity over their length and the client wanted a clear span to aid the development programme, ' he adds.

In response, the manufacturer designed and produced five custom built MP250 struts to include 1.2m diameter tubular extensions.

The company claims these are the largest struts of their kind in the UK. They are capable of withstanding 250t loads at spans up to 45m without additional support.

The £4.5M ground works package of this multi-million pound project started last November with sheet piling installed by a Giken silent piling machine. Sager then excavated the basement before installing a steel waler beam around the piled perimeter.

Groundforce's involvement is due to end in May, when the struts will be de-mounted and lifted out of the excavation.

CONSOLIDATE IS working on a £3.6M ground consolidation project at the former Belvedere Hospital site in the Parkhead district of Glasgow.

Up to 10 drill rigs are being used, including three Casagrande C6s imported from Italy, one of which is the fi rst radio controlled rig of its type in the UK. Nearly 11,000 bore holes are being drilled in a 3.5m grid pattern to total depths of 470km.

The firm is installing steel drill casings to penetrate 25m to 35m thick layers of sands and gravel underlying the site, one mine shaft and four abandoned coal seams that are consolidated with a PFA and cement grout mixture to varying depths of between 30m and 45m.

Consolidation work in conjunction with consultant The Scott Partnership and geotechnical engineer Johnson, Poole and Bloomer, is due for completion next month.

The site is being stabilised for a housing development by Kier Homes and is part of Glasgow's East End Regeneration.

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