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(1) The structure is reasonable, and the full thread of the anchor bolt is of equal strength, which solves the weakness of low strength of the reverse Fried Dough Twists anchor bolt thread and flat place.
(2) The bearing capacity of the anti Fried Dough Twists bolt with the same specification is 40% higher than that of the anti twist bolt with the same specification.
(3) The operation is simple and the price is low. It is widely used for various roadway support in coal mines, railways, hydropower and other projects. Coal mines are mainly underground mining, requiring the excavation of a large number of tunnels underground. The use of tunnel support to maintain the smoothness of tunnels and the stability of surrounding rocks is of great significance for coal mine construction and production.
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Saving pit wood and steel, reducing support costs, small excavation section, small deformation of the roadway, low maintenance costs, safe and lightweight work, can reduce physical labor, reduce ventilation resistance, is conducive to one-time tunnel construction and accelerate excavation speed, has a wide range of use, strong adaptability, reduces transportation volume, and is conducive to the transportation and upgrading of the mine. However, anchor rods cannot prevent the weathering of the surrounding rock and cannot completely prevent the peeling of the rock in the cracks between the anchor rods. Therefore, when used in conjunction with other support measures, such as metal mesh, shotcrete, or shotcrete, anchor rods can achieve better support effects.
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Mpa: yield strength of the rod, in megapascals (MPa)
L: Screw thread steel type
D: Equipotential strength
O: Nominal diameter, in millimeters (mm)
A: Length in millimeters (mm)
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