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.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.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.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.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.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.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.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.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.If you have any needs or questions about self-drilling anchor systems, please feel free to contact us at
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Self-drilling anchors are the advanced type of fully threaded hollow steel tube rods. SDA is a fully threaded rod with an inner and outer diameter hollow steel tube. It is provided with a sacrificial drill bit at the end to facilitate the drilling process, coupler to join two SDA bars, screw nut, base plate, etc. The hollow steel tube has one side sacrificial drill bit and, at another end, tied with nut and steel base plate. A hollow steel tube is placed in the center of the drill hole using a centralizer to maintain its position. The grout, which covers the SDA periphery, protects the SDA under aggressive environment conditions with simultaneous grout ground and grout bar interaction throughout the threaded bond length. Self-drilling sacrificial drill varies based on the rock or soil conditions.
The hollow steel tube has more bending strength and more circumference area compared to the solid steel bar (soil nail) with the same cross-sectional area. Due to these benefits of self-drilling anchor, it has advantages over other for reinforcing solid bars, soil nails, and rock anchors. SDA installation can be done by a small drilling machine that can move in difficult access areas and provide slope protection work in difficult reach. Its application, not just only application to soil and slope reinforcement, but also for tunnel application like forepoling for tunnel advancement.
Components of SDA
One of the main components in this technology is a sacrificial drill bit. It helps the drilling and inserting of SDA operation at the same time. This increases the productivity of the SDA installation. The sacrificial drill bit quality defines improving the SDA technique&#;s penetration rate, performance, and cost-efficiency.
The rolling process enhances the yield strength of the steel. The fully threaded hollow bar allows drilling using a sacrificial drill bit at one end and another end to connect to the standard drill tool that works simultaneously for drilling and grouting. Full threading length of SDA makes it more beneficial to grate bonding to grout and tube and enable for drill rig connections and couplings.
The couplers&#; main aim is to provide the connection between seating of each hollow tube face-to-face connection. This is the main component for the energy transmission from end to end connection of anchor and provides maximum percussive energy to drill bit with lesser losses.
Bearing plate with sufficient thickness of steel plates having a central hole required at the face of SDA. The main function of this plate is to transfer the tension load of SDA to the ground.
The hexagonal nuts are made of high strength steel with properly made by all edges to satisfy the demands of anchor specifications and other operations.
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SDA installation, rotary percussion process the rotation, and percussion transfer from the hammer to hollow bar system using the shank connector.
Installation of self-drilling anchors
To drive the hollow steel bar up to the desired depth based on the design requirement using rotary drilling. The cement grout is used to inject a self-drilling anchor, and the most common water-cement ratio of cement grout varies between 0.4 and 0.5. Then the injection process was carried out through the hollow steel tube.
Applications of Self-Drilling Anchors
Self-Drilling Anchors are very suitable for weathered or un-consolidated rock stabilization. This technique is a more superior form of stabilization because the SDA technique is a relatively easy and fast method of installation compared to the outdated methods.
SDAs can be used like monopoles and micropile types because these are drilled piles composed of steel reinforcement with injected grout. These anchors are used like micropile type to stabilize the ground and related foundation problems. These anchors are suitable for tension and compression loads at varying ground conditions.
Self-drilling anchors are most suitable for the stabilization of tunnel strengthening works. Mostly for the soft rock and overburden soil conditions, the SDAs are apt for rooftop protection.
The above pictures describe the implementation of SDA as a reinforcing stabilization element for various works.