In the realm of underground construction, mining, and slope stabilization, the demand for robust geotechnical reinforcement systems continues to surge as projects push into increasingly challenging ground conditions. The SupCT Bolt System, engineered by SupAnchor—a leading manufacturer of self drilling anchor systems—emerges as a cutting-edge solution that bridges the gap between immediate safety and long-term durability. This combination bolt, available in both steel and GFRP variants, is designed to tackle a wide spectrum of rock support scenarios, from soft, fractured zones to hard, abrasive strata.
Geological uncertainties such as high groundwater, loose overburden, and squeezing ground often compromise conventional support methods. In tunneling projects across the Alps or mining operations in the Americas, engineers require a single bolt that can provide both temporary and permanent support without the need for multiple components. The SupCT Bolt System meets this need by integrating a duplex corrosion protection system, high-strength materials, and an optimized grouting mechanism into one preassembled package. The result is a drill-and-grout bolt that reduces installation time, enhances safety, and extends service life up to 150 years.
The SupCT Bolt System comprises two primary categories: Steel Bolt (including solid bar and hollow bar types) and GFRP Bolt (including solid bar and hollow bar types). Each category is meticulously engineered to deliver specific mechanical properties, corrosion resistance, and adaptability. Below, key specifications for steel bolts are summarized based on extensive laboratory testing.
| Model | Type | Weight (Kg/m) | Fully Grouted Yield Load (kN) | Fully Grouted Ultimate Load (kN) | Borehole Diameter (mm) |
|---|---|---|---|---|---|
| SSB-M20 | Steel Solid Bolt | 2.47 | 157 | 186 | 45 - 48 |
| SSB-M22 | Steel Solid Bolt | 2.98 | 239 | 300 | 45 - 48 |
| SSB-M33 | Steel Solid Bolt | 6.43 | 402 | 482 | 64 - 68 |
| SHB-R2715 | Steel Hollow Bolt | 2.47 | 159 | 191 | 45 - 48 |
| SHB-R2712 | Steel Hollow Bolt | 2.98 | 246 | 270 | 45 - 48 |
For steel bolts, the use of HRB500E rebar (SSB series) and 40Cr steel (SHB series) ensures high ductility with elongation values of Agt ≥ 8% and Agt ≥ 5%, respectively. The fully grouted performance demonstrates substantial load-bearing capacity, while end anchored performance offers slightly lower but reliable values. Borehole diameters range from 45–48 mm for smaller models to 64–68 mm for the SSB-M33, accommodating various drilling equipment.
GFRP bolts, on the other hand, provide permanent corrosion resistance, making them ideal for aggressive environments. Models such as GSB-R25 offer an ultimate load of 350 kN fully grouted, with a service life classified as permanent. The material properties comply with international standards including CSA S807 and ACI 440.6M.
The SupCT Bolt System stands out through its duplex corrosion protection, which combines hot dip galvanization and epoxy powder coating according to NS-EN-ISO 1461 and NS-EN 13438. This SupCoat technology extends the bolt's service life to up to 150 years, far exceeding conventional black steel bolts. The rebar is further encased in a plastic grouting pipe, fully embedded in mortar, creating a triple barrier against corrosion.
These features make the SupCT Bolt System a drill-and-grout bolt that provides both immediate and permanent support with a single installation, eliminating the need for multiple support components. This efficiency is critical in fast-paced tunneling projects where downtime must be minimized.
With aging infrastructure and increasing demand for underground space, geotechnical reinforcement systems must deliver reliability and longevity. The SupCT Bolt System addresses these needs by offering a solution that adapts to poor and soft rock conditions, with performance values validated through on-site tests. From European alpine tunnels to North American mining operations, the system's versatility reduces project risk and lifecycle costs.
SupAnchor, recognized as a premier soil nail system manufacturer and ground anchor bolt factory, has consistently invested in R&D to push the boundaries of ground support technology. The SupCT Bolt System embodies the company's commitment to professional engineering, innovative design, and collaborative project execution. ISO-certified production processes ensure consistent quality, while global distribution networks make the system accessible to contractors worldwide.
As infrastructure projects grow in complexity, the SupCT Bolt System offers a future-proof solution that combines high performance with ease of installation. Its comprehensive technical data and field-proven advantages position it as a key component in the evolution of rock support technology.
Explore how SupAnchor's self drilling anchor system addresses complex ground conditions in a major construction project, ensuring stability and efficiency.
SupAnchor introduces the SupCT Bolt System, a duplex corrosion-protected combination bolt for steel and GFRP applications, offering high ductility and permanent support in tunneling and mining.
SupAnchor’s self drilling anchor system delivered reliable ground reinforcement in a complex geotechnical project, combining hollow bar technology with efficient installation.
SupAnchor's T thread self-drilling hollow anchor combines drilling, grouting, and reinforcement in one system, offering high load capacity and corrosion protection for global tunneling and slope projects.
SupAnchor's self drilling anchor system was deployed on a challenging slope stabilization project, delivering reliable geotechnical reinforcement in difficult ground conditions.
