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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.
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