FIELD: constriction of main pipes. SUBSTANCE: anchoring device has tie-rod with pair of rotary blades secured by pivot unit. Lower disk is fixed on lower end of tie-rod, upper disk is disposed above pivot unit. Tie-rod with blades and disks is positioned in well. Diameter of disks is equal to that of well. Space between disks is equal to vertical size of blades placed in mounting position. Length of blades exceeds radius of well and width of blades is less than diameter of well. EFFECT: simplified construction and enhanced reliability in operation. 2 cl, 4 dwg
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