Why is Split Sets Underground Mining Better?

Split sets / friction anchors have been used as a primary roof support in the underground mining environment for many years. The anchor consists of an open seamed high tensile Supraform S420 steel tube with a face plate. One end is tapered for easy insertion into a pre-drilled hole. It is installed by driving the assembly into a marginally smaller hole than the split sets diameter and the welded steel ring then provides the necessary support to hold the washer plate in place. The set then uses friction to anchor itself along the whole length of the bolt by relying on the radial spring force generated through compression of the tube. Split set technology is used worldwide by many mines for an extensive variety of mining applications.

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Key Advantages of using Split Sets

• Fast and easy installation
• Full length support
• Effective support at any angle
• Cost effective
• Axial and radial support
• No torqueing or re-torqueing
• No special equipment is required
• Improved rock stability

Pull testing on the split set friction anchors proves their superiority in anchoring themselves inside the drilled hole. Once the product has been installed, the spring loading allows the anchor to adapt to minor changes in the ground conditions. This is an important advantage over inelastic bolts that are unable to adapt to changing ground conditions.

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The split set is a popular choice due to its easy installation. Once the hole is drilled, the driver tool drives the anchor into the wall. Installation time is typically less than a minute and there is no waiting time for grout to set, no tightening or torqueing and no ongoing maintenance is needed after installation. This saves time, labour and additional grouting or resin expenses.

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1. Corrosion Resistance:3CR12 stainless steel is known for its excellent corrosion resistance, making it particularly suitable for underground mining environments where exposure to moisture, water, and corrosive elements is common. This resistance helps to maintain the integrity of the split set over time, reducing the risk of degradation and ensuring a longer service life.
2. Strength and Durability:Stainless steel, including 3CR12, is known for its high strength and durability. This is crucial in underground mining, where ground conditions can be challenging. The split set acts as a ground support system, providing stability to the surrounding rock. The use of a self-drilling design further enhances the efficiency of installation, reducing the need for additional drilling equipment.
3. Ease of Installation:The self-drilling feature of the split set simplifies the installation process. This can lead to significant time and cost savings compared to traditional methods that require separate drilling and installation steps. The ability to drill and install in one operation enhances the overall efficiency of ground support implementation in underground mining.
4. Reduced Downtime:The quick and efficient installation of a self-drilling split set helps minimize downtime in mining operations. Faster ground support implementation means less disruption to mining activities, allowing for smoother and more continuous mining processes.
5. Versatility:3CR12 stainless steel split sets are versatile and can be used in various mining applications. They are suitable for stabilizing different types of rock formations and ground conditions. The adaptability of these split sets makes them valuable in a range of underground mining scenarios.
6. Long-Term Cost Savings:While the initial cost of stainless steel split sets might be higher compared to alternative materials, their corrosion resistance and durability contribute to long-term cost savings. The reduced need for frequent replacements and maintenance offsets the higher upfront investment.
7. Safety Considerations:The stability provided by self-drilling 3CR12 stainless steel split sets enhances overall safety in underground mining. By preventing rockfalls and ground instability, these support systems contribute to a safer working environment for miners.

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