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The geological conditions of diversion tunnels are complex, underground water is rich and
rock stratum is broken. Once adopting common anchor bolt, it will cause frequent sticking,
which makes work efficiency low and brings great influence for construction progress. Then
project’s quality can not be guaranteed. So self drilling anchor bolt is recommended.While
self drilling anchor bolt is a new supporting method, combining drilling, grouting and
anchoring together. With different drill bits, self drilling anchor bolt can adapt for
different geological conditions and have effective supporting effect.
The advantages of self drilling anchor bolt are as following:
1. It combines drill bar with hollow anchor bar. Hollow anchor bar can bear bigger shear
force and resistance, so it can stand bigger load.
2. It is convenient and time-saving. Self drilling anchor bolt can be used for drilling and
grouting, which decreases the procedure of retaining wall.
3. It can inject cement mortar into drill holes or cracks effectively, which increases self
drilling anchor bar’s frictional resistance.
4. It can be inserted to designed depth with specialized couplings, which can be lengthened
when drilling holes.
5. Specialized stop-grouting plug can block holes and don’t overflow slurry when grouting.
Spiral channel can be formed on the surface of anchor bar, which can realize air elimination
and grouting dense.
In a word, self drilling anchor bolt plays an important role in diversion construction of
hydroelectric station. It quickens construction progress, ensures project’s quality and
achieves good economic and social benefit. So, self drilling anchor bolt is a quite
effective and safe anchoring method for difficult and complex conditions.

http://tblo.tennis365.net/sinorockbolt/2016/09/10/self-drilling-anchor-bolt-accepted-in-the-projects-at-the-present-stage/