FIELD: mining; applicable in supporting of mine workings. SUBSTANCE: lock has clamp with nuts, shaped strip embracing support section from the side of bottom, and mechanism for amplification of interaction force of support members made from special section. The mechanism is made in the form of insert installed inside contour of section of force interaction of walls of section and clamp. Inclination angle of insert end face planes to symmetry axis is equal to angle of inclination of support section walls to symmetry axis of its cross-section. Insert may have hollow for clamp. EFFECT: higher stability of lock joint operation. 2 cl, 2 dwg
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