Ground improvement specialist Pennine has added a prototype Casagrande rig to its existing fleet of 18 vibro rigs.
The Italian rig is the first of its kind to be manufactured specifically for vibro work − a modification from its conventional use as a CFA piling rig.
The 63t prototype has a 19m mast that is capable of inserting columns by bottom feed to 12m − a 20% increase on Pennine’s other vibro rigs. Recent trials also indicate that faster insertion rates can be achieved than previously.
The rig can install both vibro stone columns and vibro concrete columns using either top or bottom feed systems, making it suitable for a wide range of ground conditions.
The adaptations made to the standard Casagrande rig include a modified sledge assembly and couplings for fitting a vibroflot and the housing of a power-pack for driving the flot. For bottom feed projects a fixed stone hopper and travelling hopper system have been designed for fitting to and operation by the rig’s hydraulic controls.