Geotech offers two different CPT systems, the new and improved NOVA system with 17 bits resolution in real-time (both cordless and cable) and the forerunner the Classic system.

There are three different ways to transfer the data from the probe to the surface, two cordless and one by cable. The cordless CPT uses radio waves or acoustic signals to send the measurement to a receiver at the surface.

Upgrade your Classic CPT system to NOVA CPT system and be able to use both Classic and NOVA probes. For more information please contact us at This e-mail address is being protected from spambots. You need JavaScript enabled to view it or call +46 31 289920.

Developments of CPT

The cone penetration test, or CPT in short, is a soil testing method which will provide a great deal of high quality information.

The method was developed in Holland during the twenties mainly to avoid settlements and to build better foundations. The method builds on the principle of measuring the thrust used to press down a probe into the soil with constant speed. Later, a system with dual rods was developed which would also measure the force on the cone tip itself, and local friction. In the late seventies, probes with electrical sensors were taken into use. This led to the advantage that the resistance could be measured at the cone tip and there were also possibilities to register additional parameters.

Today, it's common to measure, in addition to the cone resistance and the sleeve friction, also the generated pore pressure which develops in the soil when the probe is pressed down the so called CPTU.

Advantages

There are many reasons for the wide spread use of the CPT method. The most important being the in-situ measurement, it measures the soil properties in its right environment, in the soil as it is, where it is.

CPT is a fast method and therefore cost effective. It also gives a good over-view of the soil topographic, because of the continuous measures. Because there is no spoal, as when drilling, CPT is used for many environmental studies.