What Is Self Drilling Rock Bolt Different from Anchors?

Self-drilling rock bolt is an improvement and innovation on the basis of traditional anchors. It has many advantages over traditional anchors.

No Need Casing Pipes

The rock anchor can be drilled in a loose soil layer or a broken rock layer without the need of a casing pipe to protect the drilling hole collapsing. Since the self-drilling anchor system is drilling and grouting simultaneously, there is no worry about that the drilling hole collapses and the anchor cannot be installed.

Pressure Grouting

By means of pressure grouting, the cement mortar is evenly distributed in the borehole and penetrates into the surrounding soil or rock layer (the so-called filter cake effect). This results in higher bond strength while allowing the soil and hollow anchor bolt to be better integrated into the softer soil layer. What’s more, the slurry could fill into the cracks or the rock and soil to expand the diameter of the anchor. So, the anchoring effect is better than traditional anchors.

Thread Design

High-strength threaded round and trapezoidal threads provide a large, robust bolt that is ideal for rotary impact drilling and ensures a strong bond to the cement mortar in the borehole. A very effective drilling technique that ensures fast drilling speeds and good directional stability of the drill pipe.