In an era where infrastructure development pushes into increasingly complex geological formations, the demand for reliable ground support systems has never been higher. From deep tunnels through fault zones to open-pit mines with unstable rock masses, engineers require anchoring solutions that combine immediate load-bearing capacity with long-term durability. SupAnchor, a leading manufacturer of self-drilling anchor systems, has introduced the SupCT Bolt System—a combination rock bolt designed to address these challenges with versatile steel and GFRP variants. This system, which encompasses self-drilling anchor bolts, hollow bar anchors, and drill-and-grout bolts, is already drawing attention for its robust corrosion protection and high pull-out resistance.
The SupCT Bolt System is engineered to provide both immediate and permanent support in a single installation, eliminating the need for multiple support components. This efficiency is particularly valuable in tunneling and mining operations where time and safety are paramount. The system includes two main categories: Steel Bolt (solid bar and hollow bar) and GFRP Bolt (solid bar and hollow bar), catering to a wide spectrum of geotechnical conditions. With delivery lengths from 1.5 to 6.0 meters, the bolts are adaptable to varied borehole depths and project requirements.
At the core of the SupCT Bolt System’s performance is its duplex corrosion protection. Each steel bolt undergoes hot dip galvanization and epoxy powder coating, then is encased in a plastic grouting pipe and fully embedded in mortar. This layered defense delivers a service life of up to 150 years for the SupCoat type, compared to 50 years for the standard black type. Such longevity is critical for infrastructure projects where maintenance access is limited and replacement costs are prohibitive. The system’s factory-preassembled zinc-coated expansion shells further enhance reliability by protecting threads from corrosion, reducing on-site labor, and streamlining inventory management.
Key technical specifications underscore the system’s load-bearing capabilities. For steel solid bolts, the fully grouted yield loads range from 157 kN (SSB-M20) to 402 kN (SSB-M33), with ultimate loads reaching 482 kN for the M33 model. Hollow steel bolts, such as the SHB-R2715, offer a yield load of 159 kN and an ultimate load of 191 kN. These values are validated under both fully grouted and end anchored conditions. Borehole diameters are standardized at 45–48 mm for most models, while the SSB-M33 requires 64–68 mm. All steel bolts are made from HRB500E or 40Cr steel, ensuring high ductility with elongation of at least 5–8%. The optimized grouting design—with a short distance between the grouting pipe end and the expansion shell—ensures the borehole end is filled first, preventing voids and guaranteeing complete grouting.
The GFRP variant offers a permanent corrosion-resistant alternative. With ultimate loads up to 560 kN for the GSB-R32 solid bolt, these fiberglass-reinforced polymer bolts are ideal for environments with aggressive chemical exposure or where electromagnetic neutrality is required. The GFRP hollow bolts, such as the GHB-R25, provide an ultimate load of 220 kN and a torque requirement of 200–250 Nm. All GFRP models feature a permanent service life and an elongation of 0.02, making them suitable for long-term support in highly corrosive conditions. The system’s bubble-designed plastic grouting pipe contributes to strong pull-out resistance, as evidenced by rebar anchorage tests.
The following table summarizes selected performance data for the steel bolt models:
| Model | Weight (kg/m) | Thread | Fully Grouted Yield Load (kN) | Fully Grouted Ultimate Load (kN) | Borehole Diameter (mm) |
|---|---|---|---|---|---|
| SSB-M20 | 2.47 | M20 | 157 | 186 | 45–48 |
| SSB-M22 | 2.98 | M22 | 239 | 300 | 45–48 |
| SSB-M33 | 6.43 | M33 | 402 | 482 | 64–68 |
| SHB-R2715 | 2.47 | R27 | 159 | 191 | 45–48 |
| SHB-R2712 | 2.98 | R27 | 246 | 270 | 45–48 |
Beyond the raw numbers, the SupCT Bolt System incorporates several user-centric features. The safe bolt head design prevents mortar leakage and protects operators from splashing during installation. Protective transportation and storage, with bolts clamped in groups on pallets, reduce damage and simplify stock management. The optimized grouting design and pre-installed expansion shells contribute to consistent field performance, even in poor or soft rock where on-site testing is advised to confirm representative values.
The SupCT Bolt System is engineered for a spectrum of geotechnical reinforcement applications. In tunneling, where the self drilling anchor system must withstand dynamic loads and corrosive groundwater, the duplex protection of steel bolts ensures decades of service. In mining, the combination of immediate anchorage via the expansion shell and permanent support through full grouting makes it a drill-and-grout bolt that reduces cycle times compared to conventional multi-step systems. For slope stabilization and soil nailing, the GFRP variants offer a corrosion-free alternative that is particularly advantageous in coastal or chemically aggressive environments. As a geotechnical reinforcement system, the SupCT Bolt addresses both temporary and permanent support needs, aligning with the industry’s push toward safer and more efficient ground control.
The global infrastructure market increasingly favors solutions that consolidate multiple functions into one component. The SupCT Bolt System delivers immediate load transfer through its zinc-coated expansion shell while the fully grouted body provides long-term bond strength—essentially performing as both a rock bolt and a hollow bar anchor. This dual functionality reduces the need for separate support systems, lowers material inventories, and accelerates installation. For contractors working in remote locations or tight schedules, the factory-preassembled components and protective packaging translate into significant time and cost savings.
SupAnchor has established itself as a professional and innovative ground anchor bolt factory and soil nail system manufacturer. The company’s commitment to quality is reflected in its adherence to international standards: hot dip galvanization follows NS-EN-ISO 1461, epoxy powder coating complies with NS-EN 13438, and GFRP bolt properties reference CSA S807, ACI 440.6M, and ASTM D7957M. These certifications ensure that the SupCT Bolt System meets the rigorous demands of European, North American, and other global markets.
The SupCT Bolt System has already been deployed in various infrastructure and mining projects worldwide, demonstrating its adaptability across different geological conditions. From high-altitude tunnels in the Alps to deep-level mines in South America, the system’s high ductility steel bolts and permanent corrosion-resistant GFRP bolts provide reliable ground support. SupAnchor’s collaborative approach—working closely with engineers and contractors to customize bolt lengths, thread types, and corrosion protection levels—further strengthens its position as a trusted partner in geotechnical engineering.
As the construction industry evolves toward more sustainable and resilient infrastructure, the SupCT Bolt System stands out for its longevity and reduced maintenance needs. By offering a service life of up to 150 years with the SupCoat corrosion protection, it contributes to lower life-cycle costs and enhanced safety in critical structures. SupAnchor continues to invest in research and development, ensuring that its self-drilling anchor bolts and related systems remain at the forefront of ground support technology.
For more information about the SupCT Bolt System and other self-drilling anchor solutions, visit SupAnchor’s official website or contact their technical support team.
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