Split Sets are an efficient ground support element commonly used in underground installations that work primarily through friction, providing immediate reinforcement. They consist of a longitudinally grooved steel tube, with one end tapered to facilitate easy insertion into a borehole.
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The Split Set is installed by driving it into a borehole with a diameter slightly smaller than the outer diameter of the bolt. This forced insertion generates contact forces between the external surface of the bolt and the inner walls of the borehole.
As the bolt is inserted into the undersized hole, radial forces are created along the entire length of the bolt. These forces generate continuous frictional resistance between the bolt and the walls of the borehole, which provides an immediate and effective anchoring mechanism. This frictional resistance is what gives the Split Set its strength and ability to stabilize the surrounding ground.
Due to their simple design and efficient installation process, Split Sets are widely used in mining operations, tunneling projects, and other underground construction projects. They are valued for providing a quick, cost-effective, and reliable solution for ground reinforcement, ensuring the stability of excavations, tunnels, and other underground structures.
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.
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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