AboutMpumatech Stainless Tube (Pty) Ltd
Mpumatech, has in a recent drive to expand our product range and after exploring all industry needs for rolled products, have decided to focus on the manufacture of split sets / friction anchors for underground mining and civil engineering projects. Mpumatech have now developed their own split set friction anchor which we manufacture alongside our main product ranges at our facility, conveniently located in Witbank, close to major transport links and hubs in Johannesburg.
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.
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
Changing Ground Conditions
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.
Split set friction anchors are available in 33mm, 39mm, 41mm and 46mm diameters in a variety of lengths to suit the application of the mine. Depending on the strength and corrosion requirements, we offer S420MC Serriform as well as 3CR12 stainless steel. The domed bearing washer plates are available in 125 x 125 x 4mm and 150mm x 150mm x 4mm as well as the Combi Plate 300mm x 270mm x 1.6mm.