The boring pile device technology with widening

The article is devoted to the problem of strengthening the foundation soils in areas of weak soils with borehole piles with broadening. The relevance of the chosen topic is confirmed by the results of an analysis of a number of domestic and foreign scientific publications. A previously sealed drilling pile with an extension is considered, and some changes in technological solutions are proposed, de-signed to ensure higher manufacturability of work and reduce the duration of work. The effectiveness of the proposed widener is expressed in the possibility of its repeated use and reduction of the cost of 1 m3 during its subsequent use for the installation of a drilling pile using the proposed technology. The design solution of the widener is presented, and the technological sequence of work performed during the pile construction is shown. The novelty lies in a new technical solution for designing an expander consisting of a cutting device (knives are pivotally fixed to the rack) and a pusher, as well as the possibility of its use to create an expandable space of the required diameter, which is ensured by changing the position of the knives in the zone of weak soils