FIELD: civil engineering. SUBSTANCE: metal bar is secured to rod with primary bend towards well wall. Lower end of the bar is secured to the rod immovably over the tool. Upper end is secured by movable holder so as to be moved over axis along the rod. Hardening material is put to the well with the tool being in lower position. On filling well up with hardening material, force effect is applied to movable holder, then holder is moved down along rod to bend of metal bar, and until bar bend is introduced in well wall. Then movable holder position and bar position are fixed. Rod is rotated to form well widening. Then movable holder is released and moved upward until rod comes straight. Then the tool is withdrawn, and reinforcing skeleton is installed in it prior to hardening. EFFECT: higher bearing capacity. 4 cl, 6 dwg
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