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
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&#;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.
If you have enquiry or require further information on our manufactured split sets, you can find our contact details on this web site.
Split Set Mining Systems mission was to develop a system to install pre-grouted Friction Bolts using the existing equipment and methodology of regular Friction Bolts. Without compromising ease of installation, compatibility with mesh and shotcrete, overall productivity and increasing the level of safety provided.
How it works; The thick grout is pre-placed into the bolt via the use of a wet cement sausage, inserted into the bolt before the installation of the bole in the hole. The bolt is then installed &#;as normal&#;.
Performance can be greatly improved by grouting the inside of the bolt using a thick strong grout. This occurs because Split Sets conform to the shape of the borehole in which they are installed and the grout once set locks the shape dimensions of the Split Set in the Hole. A typical 45mm borehole varies 1mm along its length.
In order to remove the grouted bolt from the hole either the grout, the steel, the rock or some combination of theses three needs to fail.