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《Coal Science and Technology》 2017-01
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Experiment study on bolt and accessories affected to conversion performances of pretension

Guo Jingang;Liu Yutian;Datong Coal Mine Group Corporation Limited;Xuhai College,China University of Mining and Technology;  
In order to master the conversion performances between the bolt pretension and the pretension torque,based on the bolt and the accessories made by Datong Coal Mine Group as the study object,the in-door experiments were applied to study the five factors of the tray material,type,friction-reduction gasket,bolt diameter and bolt material affected to the conversion performances.The results showed that as for the flat tray without the friction-reduction gasket,the higher strength would be and the higher pretension value would be from the pretension torque of the bolt.The orifice failure of the no arc slot spherical tray blocked the above performances to be played.After the slot processed,the pretension obtained from the 280 N·m torque conversion would be increased by 67.9%.When the friction-reduction gasket applied,the pretension of the bolts with the plat tray and spherical tray would be increased by 38.8% and 112.1% when the torque was the same and the performances of the bolt with the spherical tray would be fully played.With the bolt diameter highly increased,the conversion performances between the pretension and pretension torque would be reduced and the bolt material would be affected to the above conversion performances limited.MSGLW-500-20+arc slot spherical tray+special screw nuts with eaves+friction-reduction gasket combined method should be applied to the support of the mine roadway.
【CateGory Index】: TD353.6
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