The screw foundation received this name at the expense of its supports, which screws into the ground with a screw, thus being a support for the foundation itself. Such a support is a large size of a screw that has a screw cut, due to which it is screwed into the ground and is screwed. After the piles are driven into the soil to the desired depth, their strapping is carried out using a beam or metal parts. Everything will depend on the proposed load on the foundation.
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Screw piles are not in all cases endowed with cutting, you can also find variants of constant diameter with pointed ending. In most cases, piles for this type of foundation are driven into the soil to a depth that exceeds the level of freezing. The advantages of the screw foundation are precisely in the method of attaching support piles. Cloby into the soil, they compact it, forming an obstacle to the upcoming shrinkage of the structure.
Despite a number of positive qualities, this type of foundation is far from applicable in all cases. The most priority areas of using such a foundation are the construction of frame-panel structures, buildings of various purposes from the beam, installation of garages, arbors and fences.