The mainly performance and specification of friction

1、Mainly technology performance

(1) Initial anchorage force: 3-7tons;

(2) Pipe ring pull off load: 8-10tons;

(3) Bolt pipe breaking ability: 12-13tons;

(4) Corrosion resistance is 20-30% higher than A3 steel, long-term use.

2、Specification

(1) external diameter(mm): Φ30,Φ33,Φ40，Φ43(±0.5);

(2) Length(mm): 1200, 1500, 1800, 2000, 2500(also can produce according to customer’s needs);

(3) Material: 16Mn, 20Mnsi, pipe joints are now used less in coal mines.

3、Working principle and characteristics of friction bolt: friction bolt is a kind of full length anchoring, active reinforcing the surrounding rock of the new bolt, it is a vertical slit three-dimensional parts high strength steel tube, when installed on pipe diameter smaller than the hole, can immediately within the scope of the length of the radial pressure and prevent the surrounding rock of hole wall in friction, plus plate bolt tray retainer force, so that to stress state of surrounding rock in the three and achieve the great rock. Under the blasting vibration of rock anchor to move, and so on and so forth, later the anchoring force are increased obviously, when the displacement of surrounding rock of significant, does not lose its anchor supporting force, it than shell bolt has better properties.