FIELD: geomechanics, particularly for mine wall deformation measurement for following main rock stress calculation from said deformation values.
SUBSTANCE: device comprises surveyor tape-measure with movable nonius, tape-measure tightening unit, removable mine survey plugs provided with tape-measure engaging hooks. The mine survey plugs are made as two detachable metal wedges. Conical stop is connected to guiding side of the first metal wedge. The conical stop comprises cone, spring and threaded plug. Another metal wedge has threaded orifice extending for the full metal wedge length and adapted to receive hook for tape-measure engagement. Two metal plates are welded at base from hook side. Rubber pipe is put on outer threaded base.
EFFECT: increased operational reliability, decreased labor inputs and increased measurement accuracy.
3 dwg
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