Self drilling anchor bolt system is a new type of anchorage support tool, which can be anchored under complex geological conditions (broken rock formation, loose rock and soil layer, etc.) and is a simple, reliable, practical and efficient construction method. It is widely used in tunnel engineering and is mainly used for the initial support of tunnels, the support of roadways in coal mines. Through the hollow anchor bar, high-pressure grouting is achieved and the soil or rock mass is strengthened to ensure surface stability. high-pressure grouting through hollow shafts, and strengthening of soil or rock mass to ensure surface stability. According to the type of support in tunnels, it can be divided into advance support, radial support, face support, lock foot support and hole door reinforcement. Self drilling bolt can also be used as drill rod and anchor rod to achieve simultaneous drilling and grouting. They are adapted to geologic environments that are easy to collapse. The threaded rods are convenient for any length and cutting ,and it is suitable for construction in narrow places. It can realize pressure grouting, filling cracks, consolidating rock mass and soil layer, having good grouting diffusion radius and reliable anchoring quality.
