TUBULAR ANCHOR Russian patent published in 1994 - IPC

FIELD: mining industry. SUBSTANCE: tubular anchor has tubular rod 1 with longitudinal recess, bracing balls 2 and supporting plate 3. Bracing balls 2 are arranged in hollow of tubular rod 1, and supporting plate 3 is installed on rod external end. Edges of recess of tubular rod 1 are lap-joined. One or both edges of recess are bevelled. In lap joint, bevelled edge of recess of tubular rod 1 is located on its external side. Bevelled edge of recess of tubular rod 1 may be stepped. Supporting plate is put on tubular rod before anchor installation. Tubular rod 1 is driven into drilled hole, and then, bracing ball 2 is driven into tubular rod hollow to its end. After that, second ball 2 is driven into hollow rod. It may have larger diameter. During driving the balls, tubular rod expands in hole and bevelled edge of recess is forced into rocks. EFFECT: higher efficiency; increased adhesion of anchor with hole walls. 2 cl, 6 dwg