A Kind of Rock Bolt for Mining: Self-drilling Rock Bolt System

For accessing much more unexploited underground natural resources, mines are digging deeper and deeper. As a result, the challenges we must conquer become more and more. To ensure the safety of workers who contribute themselves to mine, especially the underground mine, we must support the variety of conditions when excavating. In general, there are many types of rock bolt for mining, such as expansion shell rock bolt, fiber reinforced plastics (FRP) rock bolt, split set, and so on. Today, Sinorock will introduce you a kind of rock bolt for mining, self-drilling rock bolt system.

a kind of rock bolt for underground mining - self drilling rock bolt system

What Is Self-drilling Rock Bolt System?

How Does It Support the Underground Mining?

What’s the Advantages of Self-drilling Rock Bolt System?



What Is Self-drilling Rock Bolt System?


Self-drilling rock bolt system is an advanced rock bolt for underground mining in recent years. It consists of a sacrificial drill bit, EX, EXX, EY, EYY, and others available, a steel hollow bar, which can be used for grouting, a coupler to extend the hollow bar, a plate, a nut, and a centralizer to ensure the hollow bar staying in the center of the drilling hole when drilling and grouting.
 

Nowadays, the self-drilling rock bolt system could be divided into two types, r thread and t thread. The outer diameter ranges from 25mm to incredible 200mm. Therefore, we can choose different sizes of self-drilling rock bolt system according to the condition we need to support.
 

How Does It Support the Underground Mining?


Self-drilling rock bolt system can combine drilling, grouting, and anchoring in one step. When drilling into the rock formation, we could use the water or compressed air to clear the hole. Or we may grout the relatively dilute cement slurry simultaneously. Also, we can grout twice with a higher pressure. Under the high pressure, the cement slurry will be pressed into the cracks of the rock and soil. After curdled, it will connect the broken rocks together. The slurry will fill in the drilling hole fully.
 


 

What’s the Advantages of Self-drilling Rock Bolt System?


1. Self-drilling rock bolt system, which combines drilling, grouting and anchoring together, is suitable for broken rock, loose soil, and conditions which are difficult to drill holes. Casing pipe is omitted in construction, which greatly improves the construction efficiency.
 

2. Self-drilling rock bolt system has a rich variety of drill bits, and drill bit can be selected according to the properties of rock and soil, which can improve the drilling efficiency.
 

3. Self-drilling rock bolt system can fill cracks, consolidate rock mass and soil layer through pressure grouting, and has good grouting spreading radius and reliable anchoring quality.
 

4. Because of the continuous thread of the hollow bar surface, it can be cut at any position and lengthened by the coupler. Therefore, self-drilling rock bolt is suitable for the construction in the narrow space where the large equipment can not enter, especially in the underground mining projects.
 

Recently, the self-drilling rock bolt serving as a kind of rock bolt for mining is more and more popular. Most mining projects now choose it as the primary method to support the unstable structure underground.

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