The (Dutch) Cone Penetration Test (CPT) is a test to measure the strength or bearing capacity of (soft) soils. It was developed in the 1950s at the Dutch Laboratory for Soil Mechanics. Today it's the most used method for soil investigation worldwide.
Lab. voor Grondmechanica Delft, currently GeoDelft (http://www.geodelft.com/)
Piles are used when the soil near the ground surface is not strong and the weight of the building must be carried by deeper soil layers.
The use of a tripod rig to install piles is one of the more traditional ways of forming piles and although unit costs are generally higher than with most other forms of piling, it has several advantages which have ensured its continued use through to the present day.
Where the bore has penetrated into clay it is often unnecessary to use lining tubes and the bore is advanced 'open hole'.
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