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1. What are self-drilling hollow grouting anchors and ordinary grouting anchors?

(1) Self-drilling hollow grouting anchor

It is composed of carbide drill bits, fully threaded anchors, trays, nuts, centerers and connectors. Each component works together and interlocks to achieve the ideal anchoring effect. Self-drilling hollow anchors are hollow inside and have no physical entity. The air and water inside can move freely during drilling and wash away particles. There are continuous threads on the outside and can be cut anywhere. Also comes with drill bit for drilling holes. They can be used for tunnel stabilization, dams and slopes, avalanche safety protection, as well as pre-support projects, radial support projects, edge skin stabilization, foundation support projects and roads. Since the anchor itself is an advanced system, it can be drilled simultaneously holes, grouting, anchoring, etc. greatly improve work efficiency.

(2) Ordinary grouting anchor

It is an anchoring agent using cement mortar. (Cement mortar is a mortar made of cement, fine aggregate, and water as needed. It is generally used in construction, hydraulic bridges and other fields. It is a kind of building material.) Its working principle is that the mortar must be injected into the hole first, and then Insert the anchor. However, in this case, the bonding degree between the anchor rod and the surrounding rock is not high, the reinforcement effect on the surrounding rock is poor, and gaps are prone to appear between the anchor rod and the rock.

 2. What are the advantages of self-drilling hollow anchors compared with ordinary grouting anchors?

Due to the needs of construction, mining, tunnel construction and other fields, ordinary grouting anchors can no longer meet the needs of projects. Engineers increasingly need a more efficient, convenient and powerful anchoring effect, because hollow anchors are gradually replacing Ordinary grouting anchors. So what advantages does it have to have a place in the market?

(1) High anchoring force: Since the hollow anchor rod is hollow, the grout has a high density after being injected into the rod body, which can better control the grouting fullness and effectively strengthen the bond between the rod body and the surrounding environment.

(2) Easy to install: It does not require thread processing on site, and the tray and nuts are also easy to install, saving construction time and improving construction efficiency. (For specific installation methods, please refer to Jiufu )

(3) Each component cooperates with each other: The hollow self-drilling anchor has a drill bit for drilling, which acts as a pillar during the drilling of support holes and grouting. The hollow anchor integrates drilling, grouting and anchoring, and has high work efficiency.

(4) Wide range of uses: It is especially suitable for broken ground conditions, which is also an important reason why it can be based in the anchoring field. Since ordinary grouting anchors cannot work in complex or soft soil ground conditions, hollow anchors can be used in complex foundation conditions, as well as in tunnel excavation, avalanche safety protection and other fields, so they can meet the needs of most constructions. 

3. Conclusion

Hollow self-drilling grouting anchors stand out in the field of anchoring projects due to their fast construction speed, wide range of uses, large anchoring force, and easy installation. In terms of geotechnical engineering, they have surpassed traditional ordinary grouting anchors and become the first choice of engineers and construction professionals.