With the popularization of bolting and shotcrete support technology in coal system, the use of rock bolts is increasing, and the use of coal system in our country is mainly used by steel bolts. In addition, the bolt cutter scrap mixed with coal, not only affects the quality of coal, and it’s easy to damage conveying equipment. The steel rock bolt is heavy, and the installation of steel rock bolt is of great strength, and the operation efficiency is low. According to the characteristics of underground coal mine, the development of high strength and light weight, coal mining machine can directly cut the non metal rock bolt,t. The high strength glass fiber reinforced plastic rock bolt is the main research direction.
High strength fiberglass pultruded rock bolt is a non saturated resin as the basic material, glass fiber as reinforcing material composite, synthetic resin good chemical properties and glass fiber height characteristics, determine the glass fiber reinforced plastic composite material with other materials can not match the performance advantages.
The use of FRP rock bolt in underground coal mine has the following advantages:
(1) the glass fiber reinforced rock bolt is light weight with high strength: the relative weight is only 1.5-2.0, and the strength can be close to the level of the steel, and the supporting strength of the FRP bolt is close to that of the steel material, and its weight is only about 1/5 of the same size.
(2) glass fiber reinforced plastic rock bolt is easy to cut, it won’t produce sparks, glass steel is not a metal material, easy to cut, and will not produce sparks, especially suitable for “fully mechanized”. It can not only ensure the safety of underground coal mine, but also solve the mine anchor supporting function, and it can greatly improve the efficiency of coal mining, reduce the cut coal machine cut tooth damage to reduce the production cost.
Fiberglass rock bolt has been used in construction industry, automotive and railway transportation industry, electrical industry and communication engineering.