As a full-length anchor, the friction bolt is a new type of anchor that reinforces surrounding rock actively. Its three-dimensional part is a high-strength steel pipe with a longitudinal slit. When installed in a hole smaller than the pipe diameter, it can apply radial pressure to the hole wall and the friction force to prevent the surrounding rock from falling over the entire length, plus the supporting force of the anchor tray support plate, so that the surrounding rock is in a three-way stress state, and the rock formation is stable.

Anchor clamp is one of the components of friction bolt. The material is made of welding rod, welding head and rolling head to make the rod body, cutting around the ring to make the retaining ring, cutting plate, punching and punching to make the tray, rod and retaining ring. There are many types of anchor clamps. Butterfly clamps and flat clamps are commonly used in mines. As an important part of the anchor support system, the anchor clamp affects the anchor support effect directly. The role of the clamp is to transmit the thrust generated by the nut tightening torque to the top gang to generate the initial anchor force. At the same time, the pressure of the roadway top gang is transmitted to the anchor rod, which generates working resistance, strengthens the surrounding rock together, and prevents the road top displaced.

Therefore, when selecting a clamp, the first is to meet the strength matching between the anchor clamp and the anchor rod body, so as to avoid the phenomenon of anchor perforation due to insufficient strength of the anchor clamp. The second is to meet the matching of the anchor clamp and the anchor rod body on the supporting structure, to avoid the uneven force of the anchor rod body and the nut due to the mismatch between the anchor rod body and the tray on the supporting structure, which affects the support of the roadway.

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