FIELD: construction.
SUBSTANCE: invention relates to construction and may be used in arrangement of pile foundations. To reduce material intensity and to increase reliability of design in a root pile with local flares, comprising a bit 11, rods 1, connecting couplings 3 and crown couplings 2 with cavities in drill blades 5, in which stop elements are installed, according to the invention, the stop element in each crown coupling 2 is made in the form of a valve made of a cone-shaped plunger 6 with a return spring 7, fixed inside the cavity, at the same time the diameter of the output hole 9 in the crown coupling 2 must be 1.5-2 times less than the diameter of the input hole 10.
EFFECT: reduced material intensity and increased reliability of a structure.
3 dwg
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