Yielding device for accurate application and monitoring of pretightening force of roadway bolt and use method

• Main Authors: AN TIELIANG, ZHU DENGXING, WANG WENKAI, ZHENG XIGUI, MA ANG
• Format: Patent
• Language: Chinese; English
• Published: 10.08.2018
• Subjects: EARTH DRILLING; FIXED CONSTRUCTIONS; GALLERIES; LARGE UNDERGROUND CHAMBERS; MEASURING; MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER,MECHANICAL EFFICIENCY, OR FLUID PRESSURE; MINING; PHYSICS; SHAFTS; TESTING; TUNNELS

The invention discloses a yielding device for accurate application and monitoring of a pretightening force of a roadway bolt and a use method and belongs to the technical field of mine roadway support. The yielding device comprises a piston rod and an air cylinder which are mutually connected, wherein a through hole matched with the tail of an anchor bolt is formed between the piston rod and the air cylinder; the sections of the piston rod and the air cylinder are of annular cylindrical structures; an air cylinder cavity is formed inside the air cylinder; the air cylinder cavity is filled withnitrogen; an air piston matched with the inner diameter of the cavity is arranged on the piston rod; an air hole communicated with the air cylinder cavity inside the air cylinder is formed in the side wall of the air cylinder; an inflation valve is arranged on the air hole; two annular sealing grooves are formed in the inner wall, in contact with the piston rod, of the air cylinder; anti-foulingscraping rings and sealing