The anchoring force of split set rock bolt is related to many factors. Within a certain range, the greater the elastic deformation rigidity and elastic deformation of the seam steel pipe, the greater the elastic deformation of the steel pipe that is longitudinally slit along the full length of the borehole wall. The greater the radial pressure, the greater the anchoring force of the pipe joint anchor. The pipe joint anchor is full-length anchoring, and the anchoring force is provided immediately after installation. The anchoring force of the mining split set will gradually increase with the increase of the deformation of the surrounding rock of the roadway. Pipe joint anchors have been widely used for a period of time, and are still used in some projects.

The conventional split set rock bolt body we know is a high-strength steel pipe with longitudinal slits along the full length processed by thin steel strip coils. The cross section of the slit steel pipe is a notched ring "C". The working principle is to use external force to drive the pipe joint anchor into the rock and soil borehole with a diameter of 1-3_ smaller than the outer diameter of the anchor body or directly into the soil. The hole wall is squeezed; the elasticity of the longitudinally slotted steel pipe along the full length is used to generate radial pressure on the hole wall, so that the split set rock bolt and the hole wall generate frictional resistance within the full length of the rod body, plus the supporting force of the outer end tray of the anchor rod, So as to strengthen the rock and soil to achieve the purpose of stabilizing support.