Friction bolt is a kind of bolt with longitudinal opening of the bolt body. Compared with other bolt, the advantages of friction bolt lie in the high strength alloy strip steel, which can make the bolt body stronger. The simplest installation without anchoring agent; The friction between anchor bolt and rock mass is large. It has high alkali resistance and tensile strength. Equipped with high strength pallets, the pallets bear even force; Roadway height is greater than anchor length.

The working principle of friction bolt: install the friction bolt in pipe diameter smaller than the borehole, at this time, would impose three force on surrounding rock, one is in the friction bolt length range of radial stress of hole wall, is a kind of friction, to prevent rock fall, another is the retainer plate friction bolt tray. These three forces make the surrounding rock more stable.

The advantages of friction bolt are not only the working principle and the design and installation of bolt, but also the special advantages in preventing the corrosion of friction bolt. For example, the typical anti-rust measures have regular mine pressure observation, if the spray cracks are found, the re-injection measures can be implemented. It is more convenient than other bolt.

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