Khalimendik Yu.M., Baryshnikov A.S., Khalimendik V.Yu. SAFE USAGE OF JOINT CLAMPS FOR THE ARCH YIELDING SUPPORTS

SAFE USAGE OF JOINT CLAMPS FOR THE ARCH YIELDING SUPPORTS

Khalimendik Yu.M., Baryshnikov A.S., Khalimendik V.Yu.

Khalimendik Yu.M., D. Sc. (Tech.), Professor,

Baryshnikov A.S., Ph.D. (Tech.),

Khalimendik V.Yu, M.S (Tech)

(SHEI “NMU”)

Abstract. The purpose of this research is to investigate operation of joint clamps in the arch yielding supportы made of special V-shape profile SVP. The joint clamps bending deformation and breakaway in the mine conditions are analyzed. On order to better understand operation of the joint clamps, the bench tests were conducted with using hydraulic press for loading a line segment of the v-shape profile support with yielding joint. It is found that when a yielding joint operates, the adhesion and slipping of its elements are interchanged, and the joint clamps are bended. The abrupt transition from the adhesion to the slipping is accompanied by jumping of the bended clamps and spark generation. The theoretical studies have shown that the spark temperature and life-time are enough to ignite a methane-air mixture. Thus, it is practically proved that the arch yielding support can be a source of an accident in the mine. To exclude spark generation, an improved design of the joint clamp is proposed, which prevents the clamp from bending. The new design includes a clamping plate, which is installed between the joint clamp and the support element. Results of bench testing of the joint clamps with a clamping plate confirm effectiveness of the proposed solution: a smooth operating characteristic of support without sudden jump of the clamps and spark formation is achieved.

Keywords: joint clamp, yielding joint, special v-shape profile SVP, methane-air mixture, ignition, spark, explosion safety.

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About the authors

Khalimendik Yuriy Mikhailovich, Doctor of Technical Sciences (D.Sc.), Professor, Professor of Mine Surveying Department of State Higher Educational Institution “National Mining University” (SHEI «NMU»), Dnepr, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Baryshnikov Anatoliy Sergeyevich, Candidate of Technical Sciences (Ph.D), Assistant of Mine Surveying Department of State Higher Educational Institution “National Mining University” (SHEI «NMU»), Dnepr, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Khalimendik Vladimir Yuriyevich, Master jf Science, Engineer of Building Constructions Laboratory of State Higher Educational Institution “National Mining University” (SHEI «NMU»), Dnepr, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.