In the demanding world of underground construction and geotechnical engineering, time and safety are paramount. Traditional drilling methods using casing systems often prove slow and cumbersome in unconsolidated or cohesive soils, leading to project delays and increased costs. SupAnchor, a leading manufacturer in the field, has addressed these challenges with its R Thread Self-Drilling Hollow Anchor, a core component of the company's self drilling anchor system. With over 39,000,000 meters of self-drilling anchor bars successfully applied worldwide, the reliability of this innovative product is well proven.
The R thread self-drilling hollow anchor operates on a unique '3-in-1 principle': a single ribbed hollow steel bar functions simultaneously as a sacrificial drilling rod, an injection tube, and a reinforcing bar. This integration allows drilling and grouting to be completed in one continuous operation, dramatically improving construction efficiency and reducing labor intensity. Designed and produced in accordance with ISO 10208 and ISO 1720 standards, the system ensures quick on-site connection and installation, making it a preferred geotechnical reinforcement system for contractors worldwide.
Key technical parameters vary by model to suit different project requirements. The table below highlights selected models from the R thread series, showcasing their mechanical properties and dimensional flexibility.
| Model | Outside Diameter (mm) | Internal Diameter (mm) | Ultimate Load (kN) | Yield Load (kN) | Weight (kg/m) |
|---|---|---|---|---|---|
| R25N/12 | 25 | 12 | ≥200 | ≥150 | 2.30 |
| R32L/22 | 32 | 22 | ≥250 | ≥200 | 2.75 |
| R32N/20 | 32 | 20 | ≥280 | ≥230 | 2.85 |
| R32S/17 | 32 | 17 | ≥360 | ≥280 | 3.50 |
| R32SS/15 | 32 | 14 | ≥405 | ≥300 | 4.00 |
These parameters demonstrate the anchor's high load capacity and adaptability. For instance, the R32SS/15 model offers an ultimate load of at least 405 kN, making it suitable for heavy-duty reinforcement in challenging ground conditions. The hollow core (internal diameter up to 22 mm) allows efficient grout injection, ensuring complete bonding with the surrounding soil or rock. Length options range from 2 to 8 meters, providing flexibility for various project depths.
Corrosion protection is another critical factor. SupAnchor offers three anti-corrosion options: hot-dip galvanizing for basic protection in dry or slightly humid environments; SupCoating (HDG + Epoxy) for stronger resistance in moderately corrosive conditions; and stainless steel for the highest level of corrosion resistance in coastal, salt-laden, or chemical environments. This versatility ensures the hollow bar anchor can be tailored to project-specific durability requirements.
The steel used conforms to EN10083-3 and EN10025, ensuring high ductility with elongation values of A100mm ≥6%, Agt ≥5%, A200mm ≥6%. This ductility is crucial for energy absorption in dynamic ground conditions, such as seismic zones or mining operations. The R thread is available in left or right hand configurations, allowing flexibility in installation and reducing the need for specialized equipment.
The R thread self-drilling hollow anchor is engineered for efficiency in unconsolidated or cohesive soils, where traditional drilling with casing is time-consuming. It is widely used in tunneling engineering for tunnel face support, forepoling, and surrounding rock stabilization. In ground engineering, it plays a vital role in slope stabilization, foundation reinforcement, and retaining wall support. Additionally, it is ideal for emergency reinforcement projects and temporary support in soft ground, making it a drill-and-grout bolt of choice for many geotechnical applications.
In tunnel construction, the anchors are often installed in a radial pattern to stabilize the excavation face, while in slope stabilization, they are installed at an angle to provide tensile resistance against sliding forces. The ability to drill through obstructions and grout simultaneously makes them invaluable in alluvial soils and urban environments where vibration and noise must be minimized. Across Europe and America, infrastructure projects increasingly demand faster, safer construction methods. The self drilling anchor bolt reduces the need for pre-drilling and casing, cutting down project timelines and costs. Its ability to combine drilling and grouting in one step minimizes disturbance to the surrounding ground, enhancing overall safety. This efficiency is particularly valuable in urban tunneling and mountainous terrain, where access and stability are critical.
As a professional soil nail system manufacturer and ground anchor bolt factory, SupAnchor has established a strong reputation for innovation and quality. The company's commitment to ISO 10208 and ISO 1720 standards ensures interoperability and reliability across global projects. The R thread series includes additional models such as R38N/21, R51/660, and R51/1200, expanding the product range to meet diverse load and diameter requirements.
With 39 million meters of self-drilling anchor bars deployed worldwide, SupAnchor demonstrates its capability to support large-scale infrastructure, mining, and geotechnical safety projects. The global market for ground reinforcement is expanding due to increased infrastructure spending in transportation, water management, and renewable energy. SupAnchor's products are well positioned to meet this demand, offering reliable performance in both temporary and permanent applications. The company's focus on collaboration means working closely with contractors and engineers to customize solutions for challenging site conditions. The brand's philosophy—Professional, Innovative, Collaborative—drives continuous R&D to address evolving industry challenges. By providing robust, adaptable, and corrosion-resistant anchoring solutions, SupAnchor contributes to the advancement of ground engineering practices globally.
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SupAnchor's R thread self-drilling hollow anchor integrates drilling and grouting, offering high load capacity and corrosion protection for challenging ground conditions. Learn about its technical specs and global applications.
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