What are the advantages of mine bolt support? The anchor bolt support is to change the mechanical state of the surrounding rock itself through the bolt inside the surrounding rock, and form a whole and stable rock belt around the roadway. The joint effect of the mine bolt and the surrounding rock is used to achieve the purpose of protecting the stability of the roadway. It is a support method for active protection and a major change in mine support.

When the angle of the split set bolt device is too large and the tensile stress reaches a certain value, the long-term load will cause the threaded section at the end of the bolt to bend and show cracks or even cracks. When the applied pre-tightening torque is greater than 600N'm, the composite stress on the bolt is close to the yield stress of the material, and the bolt first cracks from the twists and turns, and the crack expands, causing the pipe-slit bolt to crack before reaching the breaking tension.