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How much do they know about the role of anchor rod support components? Coal miners must know! Anchor rod support is composed of components such as the anchor rod body, support plate and nut, anchoring agent, steel strip, and metal mesh.
The function of anchor rod support is jointly completed by these components.
Therefore, it is necessary to analyze the functions of anchor rod support components separately.
The function of the 01 anchor rod body is for the anchor rod body itself, as the size in the length direction of the rod body is much larger than the size in the other two directions, it belongs to the rod body in mechanics.
This type of component can provide two functions, the first being tensile and the second being shear resistance.
As for the bending and compression resistance of the rod body, they are very small and can be ignored.
For commonly used 20mm diameter anchor rods, the tensile loads of round steel (Q235), high-strength threaded steel (BHRB400), and ultra-high-strength threaded steel (BHRB600) are 119.4KN, 179.1KN, and 251.3KN, respectively.
The latter two are 1.5 and 2.1 times higher than the former.
According to material mechanics, for plastic materials, the shear strength is generally 0.6~0.8 times the tensile strength.
For commonly used 20mm diameter anchor rod bodies, the shear loads of round steel (Q235), high-strength threaded steel (BHRB400), and ultra-high-strength threaded steel (BHRB600) are 83.6KN, 125.3KN, and 175.9KN, respectively.
The function of the 02 anchor rod support plate is an important component of the anchor rod, which has a significant impact on the performance of the anchor rod support function.
The support plate has two aspects: firstly, by applying a certain torque to the nut, the support plate compresses the surface of the tunnel, providing pre tightening force to the anchor rod, and spreading the pre tightening force to the surrounding coal and rock mass, thereby improving the stress state of the surrounding rock, suppressing the separation of the surrounding rock, sliding of the structural plane, and opening of joint cracks, and achieving the active and timely support function of the anchor rod; The second is that the deformation of the surrounding rock causes the load to act on the support plate, which transfers the load to the anchor rod body, increasing the working resistance of the anchor rod, and fully exerting the role of the anchor rod in controlling the deformation of the surrounding rock.
The mechanical properties of the support plate should match the performance of the anchor rod body in order to fully utilize the support function of the anchor rod.
Insufficient strength of the support plate, poor installation quality, and being subjected to significant eccentric loads can significantly reduce the effectiveness of the anchor rod
.
