Precautions For Broken Rock Slope Construction When Supported By Self-Drilling Hollow Bolts

When it comes to self-drilling hollow bolts, many people may not know it very well. This is because the application of self-drilling hollow bolts in China is not yet common. However, in some difficult-to-construct projects, the use of self-drilling hollow bolts for support is becoming an effective solution for the construction team to solve difficult construction and low construction efficiency. Today, Sinorock will introduce to you the precautions for the construction of self-drilling hollow bolts in the rock slope support project in the fault fracture zone.

First of all, let's briefly introduce the self-drilling hollow bolt. Self-drilling hollow bolt is composed of six parts: hollow bar, drill bit, coupler, centralizer, plate, and nut. Simultaneous drilling, grouting, and anchoring in one step, it can work in large pebbles, gravel, such as mudstone, schist, volcanic rock and other geological conditions, especially the drilling construction under the geological conditions that are easy to collapse and difficult to form holes.

In the slope support of the rock layer geology in the fault fracture zone, the following three problems should be paid attention to when using self-drilling hollow bolts:

1. Use self-drilling hollow bolts for advanced consolidation grouting to ensure that the grouting is full and sufficient, and install the backing plate and nuts. Only in this way can the effect of consolidation grouting be achieved;

2. When supporting with the self-drilling hollow bolt, a certain drilling depth should be ensured to avoid the situation that only the rock mass on the surface of the slope is consolidated due to the shallow drilling, and the interior is still crushed stone and granular rock. , there is still the possibility of slope collapse in this situation;

3. Use the self-drilling hollow bolt for drilling construction. If you encounter a large rock block and cannot continue to drill, do not force the bolt bit into it. If the rock block is not broken, it is very likely that the drill bit cannot be withdrawn, and the drilling hole cannot be dredged. It may even lead to the deflection of the bolt, resulting in uneven distribution of the surrounding slurry in the later stage, affecting the anchoring effect. In this case, you can use a special drilling rig for self-drilling bolts, because it not only has the function of rotary drilling, but also has the function of impact, which can easily break large rock blocks.

In the slope engineering of the rock layer geology in the fault fracture zone, the use of self-drilling hollow bolts has good operability, which can effectively solve the problems of hole collapse, difficult hole formation, and difficult grouting, improve construction efficiency and ensure progress of the entire project.

The precautions for the self-drilling hollow bolt in the slope support of the rock layer geology in the fault fracture zone will be introduced here first. As a new type of support system, the main reason why the self-drilling hollow bolt is more and more widely used is that it can solve the unsolvable problems encountered in the construction of ordinary hollow bolts. If you have any needs about self-drilling hollow bolts or about geotechnical support, please feel free to consult.