Drilled piles are made by the method of gradually rotating immersion of the auger (auger) into the soil to the design depth under the protection of a casing pipe or bentonite solution (also in a combination of the first and second).
The concrete mixture is fed into the well using concrete pouring pipes under the action of gravity or pumping with a concrete pump. The submergence of the frame is done before the concrete is fed, and the casing pipe is removed simultaneously with the concrete feed from the mark, when the concrete mixture fills the casing pipe to the height of the extraction. in contrast to the “Bore injection” technology, this technology has a minimal impact on the stability of the soil and provides the opportunity to install the frame over the entire length of the well and can be performed in conditions of moving soils and in conditions of dense construction.
The execution of bored piles is a relatively simpler method, unlike “Bore injection piles” , but much longer and more expensive. Despite this, the technology “Drilled piles” is irreplaceable in the construction of retaining walls, the installation of piles in close proximity to existing structures and in the case of submersion of frames more than 15 m long. The name “Drilled pile” has been attached to this technology a little incorrectly, actually “Drilled pile” is performed by drilling a well in dense soils while maintaining a cylindrical shape and then filling this well with crushed stone or wet concrete and compacting each layer of such filling with a heavy metal object. Nevertheless, such a method is still used to consolidate soils, create drainage channels or compact the base of the pile. Also, the technology “Drilled piles” allows you to make a pile with an expansion in the lower part, which significantly increases the load-bearing capacity of such an element.