In modern underground engineering, ground support systems are the unsung heroes that keep miners safe and tunnels intact. Yet, in aggressive environments—saturated with moisture, acids, or salts—traditional steel bolts corrode, weakening over time and posing safety risks. To solve this pervasive challenge, SupAnchor has unveiled the SupFRP® GFRP Friction Bolt, the world’s first glass fiber reinforced polymer friction bolt. This patented innovation dramatically extends service life, eliminates spark risks, and simplifies mining processes, marking a new era in geotechnical reinforcement technology.
SupAnchor, a globally recognized geotechnical reinforcement system supplier, has long been at the forefront of anchoring solutions. Known for its self drilling anchor system and hollow bar anchor products, the company now adds this groundbreaking GFRP bolt to its portfolio. As infrastructure projects push deeper underground and into more corrosive strata, the demand for durable, lightweight anchors has never been greater.
The SupFRP® GFRP Friction Bolt was engineered specifically for corrosive and spark-sensitive environments. Its non-metallic composition provides complete immunity to rust, ensuring that support remains intact for the entire lifespan of the structure—whether that’s a subway tunnel under a salty estuary, a chemical storage cavern, or a deep mine with acid water. Additionally, the bolt generates no friction sparks during installation, a critical safety feature in gaseous mines and petrochemical facilities where a single spark could trigger an explosion.
The GFRP friction bolt’s material properties represent a quantum leap over steel. With a density of just 2.0 g/cm³—one-quarter that of steel—each bolt is remarkably light, easing manual handling and enabling faster installation, even in confined spaces. Transporting thousands of bolts to a remote mine becomes far more economical.
Below is a detailed property comparison:
| Property | Steel Friction Bolt | GFRP Friction Bolt |
|---|---|---|
| Corrosion Resistance | Low | High |
| Density (g/cm³) | 7.8 | 2.0 |
| Thermal Conductivity (w/m at 20℃) | 64 | 0.75 |
| Electrical Conductivity | Yes | No |
| Tensile Elongation (GPa) | 200 | 55 |
| Tensile Strength (N/mm²) | 390 | 1000 |
| Working Temperature | < 1000 ℃ | -50 ℃ to 100 ℃ |
Despite its lower stiffness (55 GPa vs 200 GPa), the GFRP bolt’s tensile strength reaches 1000 N/mm², far surpassing the 390 N/mm² of conventional steel bolts. This high strength, combined with outstanding electrical insulation and near-zero thermal conductivity, makes it ideal for environments where stray currents or heat transfer must be avoided. The FB-48 model, for instance, features an outside diameter of 50 mm, an ultimate load of 350 kN, an end load of 70 kN, and a weight of only 1.7 kg/m. This performance-to-weight ratio is unmatched in the industry.
Installation is straightforward: the bolt is inserted into a slightly undersized hole using standard percussion or rotary equipment. The resulting radial friction locks the bolt in place, providing immediate full-length support. Because the bolt is non-corrosive, there is no need for cement grouting in many applications, further speeding up the cycle.
In tunneling projects through water-bearing or chemically aggressive ground, corrosion of steel anchors can lead to premature failure and costly remediation. The GFRP friction bolt eliminates this risk entirely. In mining, the bolt’s unique property of being easily crushed along with the ore without damaging crushers or conveyors is a game-changer. Conventional steel bolts that end up in the ore stream can destroy expensive processing equipment; the GFRP alternative simply crushes into harmless fragments that can be separated during beneficiation.
For slope stabilization on highways or railroads, the bolt’s light weight and corrosion resistance translate into rapid installation and decades-long maintenance-free service. The bolt’s working temperature range of -50℃ to 100℃ accommodates nearly all terrestrial environments, from permafrost regions to hot deserts. Engineers specifying this self drilling anchor bolt variant can also combine it with SupAnchor’s standard hollow bar anchors to create hybrid support systems tailored to complex ground conditions.
The GFRP friction bolt is more than a product—it’s a paradigm shift in how we think about ground reinforcement. Its introduction comes at a time when global investment in underground infrastructure is soaring, and project owners are increasingly prioritizing lifecycle costs over upfront expenditure. By eliminating corrosion-related replacements, the bolt reduces total ownership costs dramatically. Furthermore, its non-sparking, non-conductive nature opens up new possibilities for safe support in hydrogen storage, battery plants, and electrical substations.
As a leading soil nail system manufacturer and ground anchor bolt factory, SupAnchor has supplied millions of anchors to projects worldwide. Its self drilling anchor systems and drill-and-grout bolts have been instrumental in challenging projects like deep alpine tunnels and urban metro expansions. Now, the GFRP friction bolt enriches this comprehensive geotechnical reinforcement system portfolio, offering engineers a bolt that does not compromise on strength yet delivers unprecedented chemical durability. Whether for temporary mining supports or permanent civil structures, this innovation sets a new benchmark.
SupAnchor’s R&D team, backed by state-of-the-art laboratories and field testing sites, spent years perfecting the GFRP formulation and production process. The result is a product that meets or exceeds international standards for ground support. With ISO 9001, ISO 14001, and OHSAS 18001 certifications, SupAnchor guarantees quality, safety, and environmental responsibility. The company’s collaborative approach means that every bolt can be tuned to project-specific requirements, including length, diameter, and end finishing.
“Our customers in Europe and North America have been asking for a non-corrosive, spark-free friction bolt for years,” says a senior engineer at SupAnchor. “With the SupFRP® GFRP Friction Bolt, we’re not just answering that call—we’re setting a new industry standard for what a ground anchor bolt factory can deliver.” As demonstration projects prove the bolt’s value in real-world conditions, SupAnchor is ramping up production capacity to meet growing demand from the tunneling, mining, and civil engineering sectors.
SupAnchor's self drilling anchor system provided reliable ground support for a new Alpine tunnel, showcasing advanced geotechnical reinforcement in difficult conditions.
SupAnchor unveils the SupFRP® GFRP Friction Bolt, the world's first glass fiber reinforced polymer friction bolt, offering unmatched corrosion resistance, lightweight, and spark-free safety for mining and tunneling.
SupAnchor's self drilling anchor bolt provided critical ground stabilization for a demanding infrastructure project, showcasing advanced geotechnical reinforcement systems.
SupAnchor’s new T thread self-drilling hollow anchor integrates drilling and grouting, offering high load capacity and corrosion resistance for tunnels, slopes, and foundations.
SupAnchor's self drilling anchor system is deployed in a challenging Colorado highway slope stabilization project, showcasing exceptional geotechnical reinforcement performance and efficiency.
