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 rock 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.
As an important form of reinforcement in geotechnical engineering,rock bolt supporting is safe, effective, and economical, etc. 
Therefore, the rock bolt will have more and more application in the international geotechnical engineering fields.
Self drilling rock bolt is widely used in railway construction, Tunneling, mining, hydropower station, dam, bridge base, foundation reinforcement of buildings. Furthermore, it is workable for the repair of ground subsidence, hole collapse, crack,  landslip and other geological disaster. 
If you are in need of self drillling rock bolt system, Sinorock is your direct manufacturing source. Our in-house shop is able to produce all types of self drillling bolts for all applications. Cutting, bending, threading, or welding, we are capable of fulfilling your order requirements. Contact Sinorock today to have us quote on your next project that requires concrete anchor bolts of any size and quantity.

Sinorock supplies its products to a number of different industries, some of which are: marine, pre-cast concrete, railroad, electrical &hydro contractors, steel fabrication and bridge builders.Our attention to quality, service and timely deliveries make us the best choice for your self drilling bolt system needs.

"Russia, Spain, France, the United States, Brazil and Chile are expected to be our main markets."One of the managers of Sinorock said,as you know that the major type of self drillling bolt,like R32,R51,T40 self drilling hollow anchor,are the most popular subjects around our clients,they are capable of combining drilling,anchoring,grouting together in a single operation.

http://www.imfaceplate.com/selfdrillinganchor/sinorocks-self-drilling-ground-anchor-system-are-in-use-around-the-world