In slope support, steep slope often appears, geological condition is quite complex and weathering often exists, the location which needs support is often high. Ordinary mortar rock bolt needs to drill hole first and then grout, which will need large-scale construction equipment, but it is difficult to reach at construction position and easy to collapse. The installation of ordinary mortar rock bolt is complex and difficult, grouting effect is not good. While self drilling rock bolt can solve these problems effectively.
Self drilling rock bolt can be lengthened and shortened arbitrarily. Simple drill machine can meet drilling requirement, so it’s convenient for manual operation. Self drilling rock bolt combines drilling, grouting and anchoring together, is suitable for broken rock stratum. Working procedure is simple, installation is fast, construction difficulty is small, excavation speed is fast. It can use hollow anchor bar as grouting gallery, makes slurry from bottom to orifice to ensure filling full of rock cracks and annular space, forming splitting effect and enhancing anchoring force.
In steep slope support, comparing with mortar rock bolt, self drilling rock bolt has advantages of fast and convenient construction, good anchoring effect, has been widely used.