In the demanding world of underground engineering and rock slope stabilization, corrosion has long been a critical challenge for traditional steel friction bolts. Now, SupAnchor, a leading geotechnical reinforcement system manufacturer, has unveiled a groundbreaking solution: the SupFRP® GFRP Friction Bolt, a patented world-first innovation that replaces steel with glass fiber reinforced polymer (GFRP). Designed to meet the evolving demands of modern civil structures, this product addresses key issues such as rust, spark generation during installation, and excessive weight, making it a transformative option for mines, tunnels, and slopes globally.
The FB-48 model of the GFRP friction bolt features an outer diameter of 50 mm, a bolt ultimate load of 350 kN, and an end load of 70 kN. Weighing only 1.7 kg per meter (density 2.0 g/cm³ vs. steel’s 7.8 g/cm³), it significantly reduces transportation and handling costs. Its tensile strength of 1000 N/mm²—more than double that of typical steel friction bolts—enables robust support in high-stress environments. The material’s low thermal conductivity (0.75 w/m) and non-conductive nature provide added safety in electrical-sensitive areas, while its non-sparking characteristic eliminates fire risks during installation.
One of the standout features is its corrosion resistance. Unlike steel, GFRP does not rust, ensuring a long support life even in aggressive chemical or marine conditions. This is particularly beneficial for coastal tunnels, wastewater treatment plants, and mines with acidic groundwater. Additionally, the bolt is easy to cut and crush, allowing it to be mixed directly into ore during mining without damaging cutting machines, crushers, or conveyors. During beneficiation, its low density enables easy separation from ore, improving processing efficiency.
The following table compares key properties of steel and GFRP friction bolts:
| Property | Steel Friction Bolt | GFRP Friction Bolt |
|---|---|---|
| Corrosion Resistance | Low | High |
| Density (g/cm³) | 7.8 | 2.0 |
| Tensile Strength (N/mm²) | 390 | 1000 |
| Thermal Conductivity (w/m) | 64 | 0.75 |
| Electrical Conductivity | Yes | No |
| Working Temperature | < 1000 °C | -50 °C to 100 °C |
These parameters solve real engineering challenges. For instance, the bolt's high tensile strength and lightweight nature allow for faster installation with smaller crews, reducing labor costs and project timelines. In corrosive environments, the elimination of rust extends service life and minimizes maintenance, offering a lower total cost of ownership over traditional steel anchors.
The GFRP friction bolt is well-suited for a variety of applications, including tunnel support, rock slope stabilization, underground mining, and civil infrastructure projects. Its non-magnetic and electrically insulating properties make it ideal for use in sensitive electrical environments such as substations, railway tunnels, and communication facilities. In mining operations where sparks are a hazard, the non-sparking feature enhances safety in gaseous or dusty conditions.
The product also complements existing self drilling anchor system technologies. While self drilling anchor bolts (such as hollow bar anchors) provide immediate reinforcement in unstable ground, the GFRP friction bolt offers a permanent, corrosion-resistant solution for long-term support. Engineers can now specify a geotechnical reinforcement system that combines high strength with durability without the risk of rust-induced failure. This innovation is particularly relevant for European and American infrastructure projects that demand extended lifespans and low maintenance.
According to industry analysts, the global demand for corrosion-resistant ground support solutions is growing, driven by aging infrastructure, stricter safety regulations, and increased mining activities in corrosive environments. SupAnchor's GFRP friction bolt is poised to capture market share from traditional steel anchors, especially in projects where maintenance costs and safety are paramount.
SupAnchor, recognized as a leading soil nail system manufacturer and ground anchor bolt factory, has built a reputation for innovation and quality. The company holds ISO 9001 and ISO 14001 certifications and has supplied geotechnical reinforcement systems to projects across North America, Europe, Australia, and Asia. The introduction of the world’s first GFRP friction bolt reinforces its commitment to R&D and collaborative engineering with clients worldwide.
“Our goal is to provide engineers with superior solutions that address the toughest challenges in ground support,” said a SupAnchor spokesperson. “The GFRP friction bolt is a testament to our focus on innovation and customer collaboration. We believe this product will set new standards for safety and performance in underground construction.”
SupAnchor’s expertise extends beyond friction bolts to include self drilling anchor systems, drill-and-grout bolts, and hollow bar anchors, offering a comprehensive portfolio for geotechnical contractors. By combining advanced materials engineering with field-proven designs, the company continues to drive the industry forward. The new GFRP friction bolt is now available for order and is expected to be displayed at upcoming trade shows in Europe and the Americas.
For more information on the SupFRP® GFRP Friction Bolt and other geotechnical reinforcement solutions, visit SupAnchor’s website or contact their technical team.
A major highway project in the Alps uses SupAnchor's self drilling anchor system to address complex geology, ensuring long-term slope stability and safety.
SupAnchor's patented GFRP friction bolt offers corrosion resistance, safety, and lightweight design for underground engineering and slope stabilization.
A challenging alpine slope stabilization project uses SupAnchor self drilling anchor system to address loose rock and high groundwater. 3,000+ hollow bar anchors installed for long-term geotechnical safety.
SupAnchor’s Grade 75 self-drilling hollow anchor bars provide high-strength, cost-effective geotechnical reinforcement for challenging slope conditions.
SupAnchor's self-drilling anchor system secures a steep slope for a railway expansion in the Alps, overcoming fractured rock and tight deadlines.
