BOREHOLE SPREADER Russian patent published in 2020 - IPC E21B7/30 E21B10/32 

FIELD: construction.

SUBSTANCE: invention relates to the field of construction and can be used to create broadening in wells for bored piles, which are mainly constructed in soft soils. Borehole extender comprises rock-compressing elements installed so that to enable formation of the borehole broadening by compaction of soil by means of pressing of the rock-compressing elements at transfer of force to them. Extender comprises a rod with a handle and a bearing foot, a transfer rod rigidly fixed on a rod, a support disc arranged on the bearing foot to turn about the bar, two diametrically arranged arched rock-compressing elements are articulated on the support disc and limiters of their rotation relative to hinge axes. Arched rock-compressing elements are made in the form of double metal arcs, including drop-shaped closed parts with stiffness bridges contacting with soil, and tail arched parts interacting with transfer rod at its turn. In the zone of transition of the drop-like closed part into the arc-like tail part, hinge sleeves are connected to them from the concave side.

EFFECT: technical result consists in simplification and weight reduction of the broadener structure.

1 cl, 7 dwg