This process of installing piles does not involve removing earth but displacing it. Installation is performed using a casing with displacement body which is vibrated, pressed and turned or driven into the soil. The casing end has a so-called displacement body.
Upon reaching the required depth a reinforced shell is placed in the casing and the pumping of concrete begins. When the pipe is filled with concrete the casing is removed and the pumping of concrete continues. The reinforced shell may be placed immediately after concreting into the fresh concrete like in the CFA method. The removable casing displacement body will remain below the pile’s concrete body.
Depending on the geological conditions and project characteristics the casing may remain in the surface. The reinforced shell may be replaced by prefabricated reinforced concrete piles within the casing. The method is used in weak surfaces.