Nottingham-based Dynamic Ground Solutions (DGS) has expanded its ground compaction capabilities by investing in what is believed to be the UK’s only 9t rapid impact compactor.
DGS’s latest investment is based on a Liebherr crawler carrier and BSP International Foundations impact system.
BSP said that the traditional approach to using one of its compactors would be for the excavator manufacturer to supply a boom-less machine with BSP manufacturing fitting a bespoke boom.
Initial conversations between DGS and Liebherr found that the compactor machine may only be used for short periods of time and would be parked up between projects, so an alternative approach was developed.
Liebherr offered an alternative configuration to the one proposed by DGS’s managing director Andy Armstrong. Liebherr engineers in the UK and at the Colmar factory in France put together a package that would see the BSP compactor capable of being swapped for a digging front end. This would potentially increase the machine’s availability and utilisation within the DGS fleet. With an order placed, both Liebherr and BSP engineers worked closely to provide each other with the relevant engineering information required to bring the machine into being.
The base 43t Liebherr 946 excavator excluding the front-end and in-cab control systems, is a fairly standard machine. The electronics have been adapted to include a screen to allow the operator to monitor the data logger for the BSP compactor.
This screen gives the operator data from the compactor such as compaction depth per pass and the required blows per pad. It also informs the operator when the designated compaction parameters are achieved. Below the three screens is the large control unit for the BSP system. The company’s Hydrocontrol system allows the operator to manually set the operation of the compactor and records the amount of blows completed by the unit. To the operator’s left is a Topcon GX60 monitor for the machine’s GPS guidance system. This allows for an effective, reliable and fast method of compacting in exactly the right spot.
The front-end of the rig consists of a boom foot with a special coupling to allow the fitment of the BSP attachment, or a digging boom and dipper arm. This is a similar arrangement which allows a quick reconfiguration of the machine as found on Liebherr’s demolition rigs. Bespoke cradles have been manufactured to allow for the safe storage of both front ends when not in use.
The traditional way to mount the tilt cylinder for such attachments to control the angle of the compactor is from the top of the compactor manufacture’s boom. In this scenario, where the stub boom is fixed to the excavator, Liebherr designed an alternative method in which the tilt cylinder for the compactor is fitted between the hoist cylinders in a more of a face shovel type of configuration.
The actual attachment comes from the tried and tested range of BSP rapid impact compactors. The five model range comprises variants with drop hammer weights ranging from 5t to 16t, suitable for carrier weights up to 75t. The RIC-9000 mounted to the Liebherr, as the name suggests, has a nine-tonne hammer weight and is capable of 35 to 45 blows per minute, with an impact energy of 106kNm.
The new rig has been put to use on the new Ikea store in Sheffield where its primary task was to consolidate the ground at specific locations in readiness for the construction work.