How Does Self-drilling Anchor Bolt System Works in the Unstable Conditions ？by Simone S. sinorockco
As we all know, due to the broken rock, it is hard to drill a hole in the unstable geological condition by using traditional hollow bolt. However, the self-drilling anchor bolt system can do it easily. Then, how does the self-drilling anchor bolt system works in the unstable conditions? Let’s see below.
Firstly, we should know a bit more about the structure of the self-drilling anchor bolt system. It consists of single-use drill bit, hollow, steel, and continuously threaded bar, coupling, nut, plate, and centralizer.
Single-use Drill Bit, including different types, which can be selected to applied to various geological conditions to improve the efficiency of drilling.
Hollow Steel Bar, with a continuous thread on the outside, which meets the international standard, is used as not only a drill pipe but also an anchor bolt.
Coupling, a connecting part, is used to lengthen the hollow bars when the length of a single hollow bar doesn’t meet the designing depth. When connecting two hollow bars, a rubber sealed loop will be put in the coupling to avoid the slurry leakage.
Plate, conducting pressure from the rock or soil.
Centralizer, ensure the hollow bar is at the center of the hole when drilling.
Then, let’s see the workflow of the self-drilling anchor bolt system through the following video.
The advantages of self-drilling anchor bolt system
1.Self drilling anchor bolt system, which combines drilling, grouting and anchoring together, is suitable for broken rock and conditions which are difficult to drill holes. Casing pipe is omitted in construction, which greatly improves the construction efficiency.
2.Self drilling anchor 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 anchor 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.The hollow anchor bar can be cut arbitrarily and lengthened by the coupler. Therefore, self-drilling anchor bolt is suitable for the construction in the narrow space which the large equipment can not enter.
Created on Feb 9th 2022 21:43. Viewed 163 times.