Resin anchor bolts are a type of anchor rod and its accessories composed of resin and metal rods, mainly used for supporting the two sides of coal tunnels, as well as supporting projects such as hydropower chambers, metallurgical mine tunnels, and tunnels. The following is a detailed introduction to resin anchor rods:
1, Type and Structure
Resin anchor rods can be divided into three categories according to the type of rod:
1. Fried Dough Twists type resin anchor bolt: the end of the metal rod body is processed into a left-handed Fried Dough Twists shaped anchor head of a certain specification, and the tail is processed into a thread that can be used to install nuts.
2. Non ribbed threaded steel resin anchor rod: The rod body is made of non ribbed left-hand threaded steel, and the tail is processed into a thread that can be threaded with a nut.
3. Equal strength threaded steel resin anchor rod: made of right (or left) precision rolled threaded steel, with continuous threads and the entire length can be threaded with nuts.
2, Technological superiority
Resin anchor rods have significant technological advantages compared to traditional anchor rods:
1. High anchoring force: The anchoring force of resin anchor rods is 3-4 times higher than that of wooden anchor rods, bamboo anchor rods, and metal anchor rods, making it more effective in controlling the surrounding rock.
2. Cutability: Composed of unsaturated polyester resin as the matrix material and glass fiber as the reinforcement material, it has high tensile strength but low shear resistance. The coal mining machine can directly cut it, avoiding the risks of sparks and coal dust and gas explosions caused by traditional metal anchor rods during cutting.
3. Excellent performance: Resin anchor rods have the characteristics of high strength, light weight, good flexibility, corrosion resistance, and low cost, making them more suitable for use underground in coal mines. It has a long service life and can maintain good support effect during underground service in coal mines.
4. Wide applicability: Suitable for hard rock, medium hard rock, soft rock, and coal seam tunnels, with easy operation and reliable quality.
3, Construction technology
The construction process of resin anchor rod mainly includes the following steps:
1. Determine the eye position: Determine the installation position of the anchor rod according to the design requirements.
2. Drilling: Use a pneumatic or electric drilling rig to drill holes, and the depth and diameter of the holes must meet the design requirements.
3. Hole cleaning: Remove the rock powder inside the hole to ensure that the hole wall is clean and free of debris.
4. Filling resin medicine rolls: Place the resin medicine rolls into the holes, and the number of medicine rolls is determined according to the hole diameter and depth.
5. Install anchor rod: Insert the anchor rod into the hole to ensure that the resin coil is in close contact with the hole wall, then rotate and push the anchor rod to the design position.
6. Curing and fastening: Wait for the resin coil to cure, tighten the nut, and complete the installation of the anchor rod.
4, Application and Prospect
Resin anchor rods have been widely used in coal mine roadway support and gradually expanded to fields such as hydropower, metallurgy, and tunnels. With the continuous advancement of technology and the reduction of costs, the application prospects of resin anchor rods will be even broader. At the same time, research and improvement are constantly being conducted on the long-term anti-corrosion protection capability of resin anchor rods to ensure their long-term stability and safety.
In summary, resin anchor rods, as a new type of support material, have shown good application effects and development potential in multiple fields.
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