Self-drilling rock bolts will be integrated with the drill pipe function, can well realize the drilling, grouting and anchoring into one-stop operation, simplify the construction procedure of engineering greatly, expanding the field of application of self drilling rock bolt in engineering. The main difference between the ordinary self drilling bolt is that it comes with a wear-resistant alloy steel drill bit, the drill bit is reserved for the slurry hole, the self drilling rock bolt’s material is made up of a high tensile strength seamless steel pipe, the whole anchor rod is cold rolled with a L-shaped thread，the length of anchor rod is 2，3，4 meters range, the self drilling anchor bar can be connected to the design length by anchor coupler during construction. The self drilling rock bolt also has a supporting bearing plate, anchor nut, anchor bar and a grouting pipe, a connecting head, a drilling machine and a connecting head, an orifice of a grouting pipe, a sealing ring, etc.. After drilling, the grout is injected through the grouting pipe, the anchor rod and the connecting head of the grouting pipe, the anchor rod and the drill bit.
It is obvious that the self-drilling rock anchor has the advantage that ordinary anchors do not have, and it is common practice to apply bushings to the weathered rock, gravel, clay, sand, pebble, etc. To prevent collapse, with a self-drilling rock anchor can save the casing, the water-cement ratio of 0. 4 -0 7 pure cement slurry (non-clay formations) to consolidate the pore walls to prevent collapsing at the same time when drilling. The biggest advantage of the self-drilling anchor is the completion of drilling, anchoring and grouting in one process, simplifying the construction process, saving at least 25% of the workload, greatly shortening the duration, in order to achieve the goal of reducing engineering costs. Self-drilling rock anchor can effectively replace the general steel bar and part of the prestressed anchor cable, it is a reliable new technology of rock and soil anchorage, with a wide range of applications, and it can promote the rock and soil materials production technology sets, factories standardization, which is conducive to improving the quality of the project.