SupCT Bolt System: SupAnchor's Advanced Self Drilling Anchor Solution for Rock Reinforcement

As underground excavation projects push deeper and into more challenging strata, the need for robust and long-lasting rock support systems has never been greater. SupAnchor, a premier self drilling anchor system manufacturer, has responded with the launch of the SupCT Bolt System—a versatile combination bolt engineered for high ductility and permanent corrosion resistance. This innovative product line, which includes both steel and GFRP (Glass Fiber Reinforced Polymer) variants, is set to transform how engineers approach ground support in mining, tunneling, and civil infrastructure.

The SupCT Bolt System integrates a self drilling anchor bolt concept with pre-installed expansion shells and a unique duplex corrosion protection system. By combining hot-dip galvanization and epoxy powder coating, the bolt core is shielded within a plastic grouting pipe, fully embedded in cementitious grout. This design ensures a service life ranging from 50 years (black steel) to 150 years (SupCoat™) for steel bolts, while GFRP bolts offer permanent corrosion resistance. As a result, the SupCT serves as a comprehensive geotechnical reinforcement system that eliminates the need for multiple support components.

Technical Excellence and Key Parameters

The SupCT Bolt System is available in solid and hollow bar configurations, covering a range of load capacities and borehole diameters. Below is a snapshot of some popular models and their fully grouted performance specifications:

For steel bolts, high ductility (elongation Agt ≥ 8% for solid bars, ≥ 5% for hollow bars) ensures energy absorption in dynamic rock conditions. Torque requirements range from 150 Nm to 400 Nm, with pre-tension values of 20–60 kN depending on the model. The optimized grouting design, with a short distance between the grouting pipe end and the expansion shell, guarantees complete borehole filling—starting from the bottom—eliminating voids and ensuring full encapsulation.

Key advantages of the SupCT Bolt System include:

• Duplex Corrosion Protection: The combination of hot-dip galvanization and epoxy coating, enclosed in a plastic sheath, provides a robust barrier against aggressive groundwater and chemicals. This is carried out to NS-EN-ISO 1461 and NS-EN 13438 standards.
• Factory Preassembly: Bolts arrive on-site with expansion shells already fitted, reducing labor and inventory complexity.
• Safe Bolt Head Design: Prevents mortar leakage and protects workers from grout splashes during injection.
• High Pull-out Resistance: The bubble profile on the plastic grouting pipe enhances mechanical interlock with the grout, ensuring superior anchorage.
• Immediate and Permanent Support: A single installation provides both temporary and final support, streamlining construction sequencing.

Applications in Challenging Ground

The SupCT Bolt System is ideally suited for projects where ground conditions are variable and durability demands are high. In deep mining operations, where high stress and corrosive water are common, the steel hollow bar anchor variants (SHB-R2715, SHB-R2712) can be installed quickly and tensioned to secure fractured rock masses. The GFRP bolts, being lightweight and non-corrosive, are perfect for temporary excavations in urban environments or for permanent support in coastal and chemical plant settings where steel would corrode.

The GFRP models, compliant with CSA S807, ACI 440.6M, and ASTM D7957M, offer ultimate loads up to 560 kN for the 32-mm solid bar. Their electromagnetic transparency and cuttability make them especially suitable for tunnel boring machine (TBM) starter walls and metro stations where future break-out is anticipated. Meanwhile, the self drilling anchor bolt method, often employed in loose and collapsing ground, benefits from the SupCT’s ability to be installed with simultaneous drilling and grouting, though the system itself is post-grouted. By combining drill-and-grout bolts with the SupCT’s enhanced corrosion package, contractors achieve a reliable ground anchor bolt solution that meets the 150-year design life required for critical infrastructure like dam foundations and highway tunnels.

Industry Value and Market Significance

Global infrastructure spending is projected to reach trillions of dollars, with a growing emphasis on resilient and sustainable construction. The geotechnical reinforcement system market is expanding, driven by urbanization, underground space development, and stricter safety regulations. SupAnchor’s SupCT Bolt System addresses these trends by offering a factory-controlled, high-performance product that reduces on-site errors and accelerates installation. As a leading soil nail system manufacturer and ground anchor bolt factory, SupAnchor provides a reliable supply chain and technical support for large-scale projects.

From the Alps base tunnels to Australian iron ore mines, the demand for reliable ground support is universal. The SupCT Bolt System meets this demand with a product that not only satisfies immediate safety requirements but also ensures long-term structural integrity without the need for expensive stainless steel alternatives.

SupAnchor: Commitment to Professional Innovation

For over two decades, SupAnchor has been at the forefront of rock reinforcement technology. With ISO-certified manufacturing facilities and a global distribution network, the company has supplied self drilling anchor systems to metro tunnels in Europe, hydroelectric schemes in South America, and mining operations in Africa and Australia. The launch of the SupCT Bolt System reinforces SupAnchor’s brand philosophy of being Professional, Innovative, and Collaborative. By working closely with engineering consultants and contractors, SupAnchor ensures that each bolt is tailored to the specific demands of the project, from material selection to corrosion protection level.

Whether it’s a temporary shaft support or a permanent slope stabilization, the SupCT Bolt System delivers unmatched versatility and longevity. For engineers seeking a drill-and-grout bolt that doesn’t compromise on durability, SupAnchor’s latest offering sets a new benchmark in the industry.