Slotted bolt is a full length anchoring, active the new anchor reinforcement of surrounding rock, it is part of a longitudinal slit three-dimensional high strength steel, when mounted on a slightly smaller diameter than drilling, can immediately in full-length range on the hole wall and prevent radial pressure of surrounding rock sliding friction, plus the anchor bar tray pallet supporting force, so that the surrounding rock in three to the state of stress, and the realization of rock steady. In blasting rock anchor shift under such circumstances, the late anchoring force has increased significantly, when the surrounding rock significant displacement, anchor does not lose its support resistance, it is rising shell type anchor rod has better characteristics.

Slotted bolt support on the strength of surrounding rock, rock structure and surrounding rock stress have different degree effect, what is the effect of bolt supporting role as the key factor, how to give full play to the initiative, timely anchor supporting capacity, improve the effect of roadway support. Slotted bolt manufacturers - Shandong with the Swiss mining science and technology limited company through the theory analysis, numerical simulation and the experiment, improve the bolting system stiffness is very important.

Improving the support stiffness way mainly has two aspects: one is the timely to the pipe joint anchor rod exerts large tightening force, and through the support plate, strip and other component to realize the pretightening force of the effective diffusion; two is the lengthening anchorage or full length anchoring, that the rod body on surrounding rock strata, fault is very sensitive, timely inhibition of abscission layer and dislocation generation. In particular the bolt pretension in supporting system has played a decisive role in the.

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