Self-Drilling Anchor (SDA) system is the application of a single-use drill bit in combination with the rock bolt being used as a drill steel.

The Self-drilling hollow anchor bolt is a fully threaded hollow bar which can be simultaneously drilled and grouted into loose or collapsing soils and brittle rock without the need for a casing.

The rock bolt is connected to the hydraulic rock drill by an adapter device and installed in the way a conventional borehole is drilled. There is a hollow interior of the self-drilling anchor bolt, a threaded exterior and a drill bit that is used for drilling. The self-drilling anchor bolt’s hollow interior enables air and water to freely more though the drilling process, flushing the particles. After completion of the drilling process, it also enables immediate injection. Continuous thread enhances pull-out resistance with grout. For fractured or hard rock formations as well as uneven ground conditions (such as gravel, soft, clay and non-homogeneous soil), self drilling anchor bolts present a specific bolting solution.

The self-drilling anchor bolt system makes your anchoring much easier, as it is capable of performing procedures of drilling, anchoring and injection all at once.

SDA system may be used for different rock conditions, and drill bits are available in different designs and diameters. The thread types are compatible to international standards and can easily be adapted to standard rock drilling equipment. The SDA range is available in different load capacity classes, depending on the outer and inner diameter of the bar.

Self-drilling hollow anchor bolt is mainly used in slope stabilization, tunneling pre-support, foundations with micro piles, it is also widely used in the railway system, metro project etc. It can be installed in sites with weak rocks, loose soil, and weathered layer, sand with stone layer and so difficult to create a hole in complex formations. The unconsolidated ground condition favor the self-drilling anchor bolt technique for fast and simple method of installation compared to the traditional method.