FRP bolts are generally composed of glass fiber and resin, of which glass fibers generally account for more than 60% of the total weight of the rod body, so the main performance of FRP bolts is mainly determined by glass fibers. Since glass fiber is an elastic material with brittle characteristics, and the resin selected for FRP bolts is generally thermosetting resin, the elongation of glass bolts is very small, generally between 0.2% and 2%; The glass fibers in the glass fiber are arranged in a unidirectional arrangement, so their tensile strength is relatively large, but their shear, torsion and bending strengths are low.
Application range of FRP bolts
(1) Sparks will be generated when the shearer encounters the steel anchor rod during the coal cutting process, and there is a hidden danger of coal dust and gas explosion; while the glass fiber reinforced plastic anchor rod has the characteristics of explosion-proof and anti-static, and no sparks will be generated during cutting, which is safe for roadway construction. Extremely beneficial, especially suitable for high gas concentration areas;
(2) The scraped steel bar bolts mixed into the coal are very easy to hurt and damage the equipment. The FRP bolt is a composite material that is easy to cut and can protect the cutter head of the shearer;
(3) FRP bolts have high bearing capacity and strong tensile strength, and the strength of the rod body is better than that of threaded steel of equal diameter, which can be used as long-term support;
(4) FRP bolts can replace steel bolts because of their excellent properties such as easy cutting, anti-static and corrosion resistance, and become ideal materials for coal support.
According to the characteristics of FRP bolts, it can also be used in coal mine roadway protection and underground projects such as mines and railways, as well as in tunnel bolt support, railway, highway and other slope bolt support, and can also be used in mine roadways. And underground engineering surrounding rock support. It can ensure the stability of mine roadway and surrounding rock of underground engineering.
Since the research on FRP bolts in China started relatively late, the tensile strength of the FRP bolts produced by Chengxinda is ≥300MPa, the shear strength is ≥75MPa, and the torsion resistance is ≥40N m
FRP bolt is a new type of cutable bolt developed in recent years to solve the requirements of high gas mines for coal support in working face. At present, the FRP bolt produced by Chengxinda is easy to cut, anti-static, high strength and high quality. It has excellent properties such as light weight and corrosion resistance, and can replace the steel anchor rod and become the ideal material for coal support. are sold at home and abroad.