The Principle of Self Drilling Anchor System in Tunneling Construction

In the realm of tunneling and underground construction, the utilization of cutting-edge technologies and methodologies is paramount to ensure the safety, stability, and efficiency of projects. Among these innovations, the Self-Drilling Anchor System has emerged as a cornerstone for excavations in unconsolidated and fractured ground conditions. Sinorock, with its years of experience in the construction of tunneling projects, has perfected the application of the Self-Drilling Anchor System to provide unmatched primary soil and rock support.

The Principle of Self Drilling Anchor System in Tunneling Construction

1. Radial Consolidation for Rock Support

In tunneling projects, the integrity of the rock surrounding the excavation is crucial to prevent collapses and ensure the safety of the construction process. Sinorock's Self-Drilling Anchor System plays a pivotal role in this aspect. The anchor system supports the rock in the tunnel circumference, effectively forming a load-bearing ring. This ring of support allows the rock to bear its own weight, working in tandem with shotcrete and other facing elements. Through this radial consolidation, the stability of the tunnel's structure is upheld, promoting safer and more secure construction.

2. Forepoling as Pre-Support

In scenarios where the rock formation is poor or the overburden is shallow, the Self-Drilling Anchor System steps in as a pre-support mechanism. By forepoling techniques, the system helps reinforce the tunnel's surroundings before the main excavation even takes place. This proactive approach is particularly valuable in critical stress conditions, ensuring that the construction process progresses smoothly and without compromising the safety of the workers or the project's success.

3. Face Stabilization for Large Cross-Section Excavations

Excavating tunnels with large cross-sections presents its own set of challenges, one of which is maintaining the stability of the tunnel face. The Self-Drilling Anchor System comes to the rescue by providing face stabilization. As the tunnel face is exposed, it is susceptible to rock pressure and potential collapses. The anchor system counters this pressure, allowing for secure excavation and creating an environment where workers can operate confidently. This application showcases the adaptability of the Self-Drilling Anchor System to various construction scenarios.

4. Root Piles: Diverting and Managing Stress

Stress diversion is a critical consideration in tunneling projects, especially when dealing with complex geological formations. Here, the Self-Drilling Anchor System takes on the role of root piles. By strategically installing anchor systems, stress can be diverted away from vulnerable areas, thereby minimizing the risk of collapses and other detrimental consequences. This innovative approach exemplifies the advanced problem-solving capabilities of Sinorock's Self-Drilling Anchor System.


Advantages of Self-Drilling Anchor System

1. Increased Efficiency

The self-drilling anchor system significantly reduces the time required for drilling, grouting, and anchoring operations. The simultaneous drilling and grouting process eliminates the need for separate drilling and grouting phases, thus accelerating the construction progress. Additionally, the self-drilling anchor system allows for rapid installation, reducing downtime and increasing overall project efficiency.

2. Enhanced Load-Bearing Capacity

The self-drilling anchor system provides exceptional load-bearing capacity due to its unique design and installation process. The immediate bonding of the anchor to the surrounding soil or rock ensures maximum load transfer, effectively distributing the forces acting on the tunnel structure. This increased load-bearing capacity enhances the stability and safety of the tunnel, allowing for the construction of larger and more complex projects.

3. Improved Adaptability

The self-drilling anchor system is highly adaptable to various geological conditions, making it suitable for a wide range of tunneling projects. It can be utilized in soft soils, loose rocks, and even fractured formations. The ability to adjust drilling parameters, such as rotation speed and feed rate, allows for optimal performance in different ground conditions. This adaptability minimizes the need for extensive ground stabilization measures and reduces project costs.

4. Cost-Effectiveness

The self-drilling anchor system offers significant cost savings compared to traditional anchoring methods. The elimination of separate drilling and grouting operations reduces labor, equipment, and material costs. Additionally, the enhanced load-bearing capacity and adaptability of the system reduce the need for additional support measures, further reducing project expenses. The overall cost-effectiveness of the self-drilling anchor system makes it an attractive choice for tunneling construction.


In the intricate world of tunneling construction, the Self-Drilling Anchor System stands as a testament to the power of innovation and engineering excellence. Sinorock's years of experience have culminated in self-drilling anchor system that not only supports tunnels' structural integrity but also revolutionizes the approach to excavation in challenging ground conditions. Through radial consolidation, face stabilization, pre-support techniques, and stress diversion, the system showcases its adaptability and versatility. As the industry continues to evolve, the Self-Drilling Anchor System remains an indispensable tool for achieving safer, more efficient, and successful tunneling projects.
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