BSP INTERNATIONAL Foundations has unveiled the latest version of its Rapid Impact Compactor (RIC) on a project in British Columbia, Canada.
Amec Earth & Environmental used the compactor on a contract for a two-storey 3,200m 2building.
Mounted as an attachment to a hydraulic excavator, the machine comes in 5t, 7t and 9t modes and is a modified version of BSP's 357 hydraulic piling hammer. The compactor's 1.2m or 1.5m diameter foot stays in contact with the ground, ensuring efficient transfer of energy to the ground at all times, BSP said.
'Energy is imparted by dropping the weight through a small height of up to 1.2m at a rate of 40 to 60 blows per minute.
Although the energy per blow is small by comparison to conventional dynamic compaction, the rapid blow frequency more than compensates, resulting in a much greater total energy input per unit area of a site.'
Ground was compacted in 6m square areas, with a minimum of two passes. The first pass comprised a minimum of nine 'blow locations' with 13 at the second. Each blow location was compacted by enough blows to achieve a final 5mm set.
Becker Penetration Testing was carried out for quality control, confirming the underlying granular soil had been improved to about 6m depth.