Friction Bolt is a new type of anchor rod with full-length anchoring and active reinforcement of surrounding rock. Its three-dimensional part is a longitudinally slotted high-strength steel pipe. When it is installed in a drill hole with a diameter slightly smaller than the pipe diameter, it can immediately apply radial pressure to the hole wall within the full-length range and friction force to prevent the surrounding rock from sliding down. In addition, the supporting force of the anchor rod tray support plate enables the surrounding rock to be in a three-dimensional stress state and realize rock formation stabilization. Friction Bolt for Sale

Working Principle of Friction Bolt

When the pipe joint anchor rod is installed in a drill hole smaller than the pipe diameter, three forces will be applied to the surrounding rock, one is radial pressure on the hole wall within the full length of the pipe joint anchor rod, the other is friction force to prevent the surrounding rock from sliding down, and the other is the supporting force of the pipe joint anchor rod tray support plate.  These three forces make the surrounding rock more stable. Friction Bolt for Sale

Technical Requirements for Friction Bolt Rod

1, pipe joint bolt surface should be smooth, no serious strain, rust.  Welds shall be free of cracks, air holes and slag inclusion, and shall not burn through the pipe wall.  The tray should be free to move on the rod body.  It is advisable that the stop ring interface and the pipe joint opening are offset 170o—190o o.  2. Pull-off force of retaining ring weld ?80kN, ultimate tensile force of rod ?110kN, initial anchor force ?25kN/m, and tray bearing capacity ?65kN. Friction Bolt for Sale

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