PILE Russian patent published in 2019 - IPC E02D5/54 

FIELD: construction.

SUBSTANCE: invention relates to construction, particularly, to driven piles with widenings. Pile includes barrel with transverse niches made in it at different levels. In each niche sliding element and device for its extension are freely arranged. In the pile barrel there is an axial blind hole communicating with transverse niches. Device for extension of each of sliding elements is made in form of active element resilient in axial direction, which is installed in axial hole and loaded with controlled longitudinal compressive force created by initially compressed helical spring. Element represents a hollow cylinder divided into separate strips by slotted slits along the whole length except for end sections. Element is made of NiTi alloy with effect of thermomechanical shape memory characterized by relay reduction of effective stiffness of active element and value of its critical force Pcr. to the value of the longitudinal compressive force with increasing the temperature of the active element to a predetermined threshold value, accompanied by loss of longitudinal stability of active element in bulging out of its lateral cylindrical surface. Forming strips of surface are attached to end faces of corresponding pull-out elements extending inside axial hole. All active elements are electrically connected to the source of electrical signals installed from above the pile.

EFFECT: pile is disclosed.

1 cl, 2 dwg