The dual mast boom is one of the latest GM innovations. Its patented technology combines the best features of direct and chain feed booms into one package that helps to optimise the efficiency in CPT-u investigations in particular. The chain feed line speeds up the operations, whereas the direct feed line allows the cylinder’s maximum compression and lifting force.
Although optimised for the CPT-u method, the dual mast boom is equipped with a dual drill table that allows it to be used for all other geotechnical investigations as well. Switching the drill line from the direct feed to the chain feed takes place by a hydraulic cylinder. The dual drill table also allows a fast and effortless automated switching between investigation methods.
The dual mast boom can be installed on Geomachine drill rigs from the GM85 upwards. It can also be installed on non-Geomachine carriers with sufficient hydraulic output.


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