The CPT pushers used around the world are designed for static CPT, i.e. for pushing the cone into the soil at 2 cm/s (0.8 in/s). But by adding the option to apply a vibration sonic CPT can be performed that will in many case increase the maximum depth that can be reached with the same pushing force.
The SonicCPT pusher 200 kN is ideal to expand the capabilities of a new or an existing CPT rig. The sonic option will greatly reduce the friction along the CPT tubes and might allow the penetration through stiff layers so static CPT can be performed underneath such layers.
The SonicCPT system consists of a pusher with a sonic thrust beam and a cone for sonic CPT operations.
The thrust beam can be moved down at the standard speed of 2 cm/s, with added superimposed vibrations at a frequency up to 150 Hz when operated in sonic mode. As a result of the sonic action, the cone will be subjected to dynamic forces. So the use of a specially designed CPT cone that can withstand the dynamic effects as a result of the vibrations is required.
|Pushing force||200 kN|
|Stroke||1250 mm | 49 in|
|Foot print||1 x 0.8 m | 40 x 32 in|
|Frequency||50 Hz - 150 Hz|
SonicCPT is an exciting and rapidly developing technique from Royal Eijkelkamp that is reducing early refusals in CPT soundings by carefully applying a vibration, when needed, to the CPT string. The technique actually has a history dating back almost 40 years. Royal Eijkelkamp’s expertise in sonic drilling technology has allowed us to take this pioneering work much further and develop into three key areas of application.
Need advice choosing the right product for your application? Our specialist Sven is happy to help.