As an important form of reinforcement in geotechnical engineering, hollow anchor bar supporting is safe, effective, and economical, etc. Therefore, the hollow anchor bar will have more and more application in the international geotechnical engineering fields.
The broken loose surrounding rock is full of instability. It’s easy to collapse and lead to loose displacement. The pressure is relatively large. Therefore it needs that kind of hollow anchor bolt which can support the rock at once after installation, own sufficient prestress and whole-grouted, and even infiltrate surrounding rock fissures.
On one hand, the surrounding rock is broken, which makes the drilling holes are difficult to form. On the other hand, there are such special situations which require minimize vibration to avoid collapse. The hollow anchor bar must be applied because it can grout without removing the drilling pipe, and It features a hollow bore for flushing, or simultaneous drilling and grouting.
The hollow anchor bar is mainly used for slope stabilization, foundation with micropiles and tunneling, it’s also widely used in the railway system, metro project, etc. It can be installed in sites with weak rocks, loose soil, weathered layer, sand with stone layer and so difficult to create a hole in complex formation. The unconsolidated ground condition favor the self drilling anchor bolt technique for fast and simple method of installed compared to the traditional method.