There are significant differences between resin anchor rods and metal anchor rods in multiple aspects, mainly reflected in material characteristics, support effects, construction processes, and economic costs. The following is a detailed analysis of the differences between the two:
1, Material characteristics
Material composition: Resin anchor rods are mainly made of glass fiber and synthetic resin through composite technology, and are a functional new type of material.
Characteristics: Resin anchor rods have high strength, corrosion resistance, light weight, and good flexibility. Its tensile strength is high, but its shear resistance is relatively small.
Material composition: Metal anchor rods are usually made of metal materials such as steel bars or steel pipes.
Characteristics: Metal anchor rods have high strength, can withstand large tensile and shear forces, and are easy to process. They can be cut, bent, and drilled as needed. But its ductility is poor, and it is prone to fracture. Once damaged, it is difficult to repair.
2, Support effect
Anchoring force: The anchoring force of resin anchor rods is significantly higher than that of traditional anchor rods, making it more effective in controlling the surrounding rock.
Stability of support: Resin anchor rod support has good stability and can effectively improve the stability of tunnel surrounding rock, ensuring the safety of construction. At the same time, it has strong corrosion resistance, is not exposed to ultraviolet radiation for underground use, has a slow aging rate, and has a long service life.
Support effect: Metal anchor rods also exhibit certain strength in support effect, but due to their poor ductility, they are prone to fracture, so their service life and long-term stability may not be as good as resin anchor rods.
3, Construction technology
Installation process: The installation process of resin anchor rods is relatively simple, usually including steps such as determining the eye position, drilling the hole, cleaning the hole, filling the resin coil, and installing the anchor rod. Its installation speed is nearly four times faster than traditional fast hardening cement anchor rods.
Severability: Resin anchor rods have good machinability, and coal mining machines can directly cut them, avoiding the risks of sparks and coal dust and gas explosions caused by traditional metal anchor rods during cutting.
Installation process: The installation process of metal anchor rods may be relatively complex and in some cases require additional processing and fixing measures.
Cutting ability: When the metal anchor rod is directly cut by the coal mining machine during the support process, it is easy to cause the anchor rod to get caught in the coal mining machine drum and damage the cutting teeth, and may generate sparks, increasing safety hazards.
4, Economic cost
Cost advantage: Resin anchor rods are lightweight, easy to transport, and can reduce the investment in transportation of tunnel support materials. At the same time, due to its good support stability, the maintenance and upkeep of the roadway is relatively low, and the maintenance costs will also be correspondingly reduced. In addition, the price of resin anchor rods is usually lower than that of similar metal anchor rods, further reducing the cost of support.
Cost disadvantage: Due to limitations in material and processing costs, metal anchor rods may have higher support costs than resin anchor rods. Meanwhile, due to its susceptibility to breakage and damage, it may increase additional maintenance and replacement costs.
In summary, there are significant differences between resin anchor rods and metal anchor rods in terms of material properties, support effects, construction processes, and economic costs. In practical applications, appropriate anchor rod types should be selected based on specific engineering requirements and geological conditions to ensure support effectiveness and construction safety.
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