Foundations for a 175-dwelling housing development being built on the site of a former quarry are making extensive use of ROM's latest ground beam and pile cap formwork system. Groundwork contractor O'Halloran & O'Brien is also using ROM's prefabricated welded beam cages.
Due to the nature of the ground the foundations are particularly complicated. They consist of a reinforced strip foundation which includes up-stand beams which are incorporated into the reinforced slab. The exposed reinforced concrete toe provides a base for the external layer of brickwork.
Using traditional timber formwork would have involved numerous distinct construction steps, according to John Lawson, agent for the developer, Persimmon Homes.
'Using the Beamform system we can concrete the beam and slab in one process, saving an enormous amount of time and cost. And by building a few courses of external brick wall prior to concreting the beam, this acts as an outside shutter with the brickwork cavity being formed by 50mm polystyrene broken out after the beam has been cast.'
Beamform is a sacrificial expanded polystyrene form which measures 1m long by 600mm deep with a 220mm wide base which tapers towards the top. Normally two lengths are used to form a beam.
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