Application Value and Structural Characteristics of Split-Type Friction Bolts in Mine Support
Application Value and Structural Characteristics of Split-Type Friction Bolts in Mine Support
Split-type friction bolts have become increasingly common in mine roadway support in recent years. Compared to traditional anchor bolts, their structure is simpler, consisting of a steel sleeve and a core rod. They achieve rapid support through friction, making them a typical “ready-to-use” product, particularly suitable for mining environments with rapid rock deformation or limited construction conditions.
Structurally, the outer tube of the split-type friction bolt is longitudinally slit or pressed, allowing it to elastically expand after insertion into the borehole. When the core rod is hammered in or tightened, the outer tube generates continuous friction within the borehole wall, thus achieving initial reinforcement of the surrounding rock. Because it does not rely on resin or cement grout for curing, it provides immediate support after installation, improving construction efficiency and reducing waiting costs associated with curing time.
In practical applications, these anchor bolts are commonly used in metal mines, coal mines, tunnels, and slope stabilization, and are particularly suitable for projects requiring rapid surrounding rock stabilization. Construction involves simply drilling and directly driving in bolts, eliminating the need for material mixing and lengthy waiting times. The entire process is simple and highly reliable. Furthermore, it is insensitive to humidity and temperature conditions, maintaining stable performance even in environments with significant variations in tunnel conditions.
To meet different working conditions, split-type friction bolts are typically available in various pipe thicknesses, materials, and surface treatments. Common treatments include galvanizing, blackening, and anti-corrosion coatings to improve corrosion resistance and extend service life. Some manufacturers also offer reinforced structures or accessories such as trays and pads, depending on the surrounding rock conditions, making them more stable in high-deformation tunnels.
Overall, the advantages of split-type friction bolts lie in their rapid installation, strong adaptability, and low maintenance requirements, making them an indispensable basic component in current mine support systems. As the industry’s requirements for safety and efficiency continue to increase, the application of these products in mining and tunnel engineering will continue to expand.