The protection of self drilling rock bolt should meet the following basic requirements:
(1)The type and standard of protection shall be determined by the factors such as the useful life of the self drilling rock bolt, the degree of corrosion of the environment in which the rock bolt is located and the failure of the self drilling rock bolt.
(2)The period of validity self drilling rock bolt olt protection shall be equal to the validity of the rock bolt;
(3)The self drilling rock anchor bolt must move freely on all its free length, and all the loads can be transferred from the free section to the anchor section during the test and loading of the anchor;
(4)Rock bolt protection facilities must have sufficient strength and toughness, and will not be damaged when the self drilling rock anchor is loaded;
(5)The self drilling rock bolt and its protective system in the production, transportation, installation process should not be damaged;
(6)Material used as a protective system to keep the cloth cracking, unchanged, brittle, or fluid in the desired operating temperature range; has chemical stability, does not react with adjacent materials, and retains its impermeability.