What Is the Difference Between Casing Drilling And Self-Drilling Rock Bolt?

During the construction of domestic support projects, in the face of loose geology, many people choose to use traditional casing to drill into holes. The self-drilling rock bolt technology introduced from abroad can be a good substitute for casing drilling, and the overall cost is lower. So, what is the difference between casing drilling and self-drilling rock bolt? Today, Sinorock gives you a brief introduction.

Casing drilling construction technology

There are many methods of casing drilling, which need to be comprehensively selected according to the type of drilling rig, construction requirements and formation conditions. Under normal circumstances, the casing is pressed into the casing while drilling, or the casing is pressed in ahead of time, and then the drilling tool follows. It is mainly divided into two methods: eccentric follow-up tube and concentric follow-up tube, which are different in process principle. Casing drilling can prevent the hole wall from collapsing or the quicksand filling the borehole during the drilling process, but the construction process is more complicated, and it is suitable for drilling loose strata and quicksand layers.

Construction technology of self-drilling rock bolt

Self-drilling rock bolts need to be inspected for the drill bit, hollow bolt body, and drilling rig before starting construction. The hollow bolt body is connected to the drilling rig and grouting machine through a rotary grouting adapter. During construction, drilling rigs and grouting can be carried out at the same time. After grouting, install the backing plate and nuts to ensure the anchoring effect. Self-drilling rock bolts are mainly suitable for difficult-to-form surrounding rock, stratum fragmentation, etc., and can enter a narrow space for construction to shorten the construction period.

The difference between casing drilling and self-drilling rock bolts

Self-drilling rock bolt construction

1. The hollow bolt body used by the self-drilling rock bolt can be cut arbitrarily, and can also be lengthened by connecting sleeves. It can be constructed in a narrow space where large equipment cannot enter, and the construction is more convenient.

2. The casing wall is omitted in the self-drilling rock anchor construction process, which greatly improves the construction efficiency, shortens the construction period, and reduces the overall construction cost.

3. The casing drilling grouting needs to put the bolt first and then connect to the grouting machine. The self-drilling hollow bolt can be connected to the grouting machine and the drilling rig through the rotary grouting adapter to realize the function of grouting while drilling.

The above is an introduction to the difference between casing drilling and self-drilling rock bolt. From the construction techniques of the two, it can be seen that self-drilling hollow bolts can be grouted while drilling. For projects that require bolt grouting support, Self-drilling rock bolts are more convenient and efficient.