With the sustainable development of the economy, the construction of underground engineering has made remarkable achievements, but in the settlement of the mountain collapse, landslides and other issues, the use of self drilling hollow bolt increasingly gets the favour of the engineers. The technology characteristic integrating drilling, grouting and anchoring is of great significance to realize complex geological conditions of anchorage.
The technical features of self drilling hollow bolt are: the main part of it is a hollow bolt, which can act as a drill pipe and the pipe for grouting. Before grouting may take advantage of the empty properties, blowing dust after rock drilling construction; The hollow bolt can act as grouting channel, when grouting, cement grout ejected from the drill through the hollow bolt, which can make the bolt closely bonded with the surrounding soil, achieving the purpose of the reinforcement of rock mass.
Before drilling, the shank of the connecting rod connected to the hollow bolt body and rock drill, after punching to design depth with the rock drill, installation plate and nut, then grouting. The size of the bit can control the size of the hole, generally the size of the hole is about 2 to 3 times the diameter of the hollow bolt. Since its rod can be freely cut, it is not only suitable for railway, tunnel and slope reinforcement engineering, more suitable for the foundation sink, hole collapse, landslides and other geological disasters of governance.