Kelly drilling belongs to the most common dry rotary drilling methods. Soil and rock material is conveyed to the surface discontinuously with relatively short rotary drilling tools. Kelly drilling
Drilling methods for deep foundations
The most common drilling methods in deep foundation are Kelly drilling, continuous flight auger drilling, full displacement drilling, double rotary drilling, drilling with hammer grab, reverse circulation air injection drilling and down-the-hole drilling. In the drilled cavity a multitude of products can be created, e.g. by filling with fresh concrete a so-called cast-in-place pile is produced. Precast concrete and steel elements serving as load-bearing or lining elements can also be inserted.