In a recent underground construction project in challenging soft ground conditions, SupAnchor's new SupFRP GFRP SDA Bolt demonstrated exceptional performance in tunnel face stabilization and slope reinforcement. The project, located in a region with highly weathered rock and clay soil, required an anchoring solution that could combine drilling, grouting, and anchoring in a single operation to minimize installation time and ensure safety. SupAnchor's self drilling anchor system was deployed, providing rapid and reliable ground support for the excavation.
The SupFRP GFRP SDA Bolt is an innovative product that integrates drilling, grouting, and anchoring into one. This drill-and-grout bolt features a central hole that allows flushing with water during drilling and the execution of anchor grouting. This design makes it particularly applicable in soft rock or clay soil for reinforcing tunnel faces or stabilizing slopes. Additionally, the bolt's cuttability protects machinery by avoiding obstructions while drifting or enlarging tunnels.
During the project, the engineering team needed a geotechnical reinforcement system that could withstand high tensile loads and torsion forces while being easy to handle. The SupFRP GFRP SDA Bolt is available in four diameter variants: H25S, H28S, H32S, and H38S, each with guaranteed tensile loads ranging from 220 kN to 490 kN. The bolt's torsion strength ranges from 180 Nm to 450 Nm, ensuring super high torque resistance during installation. The ultimate strain of 2.0% and tensile E-modulus of 45 GPa provide the necessary ductility and stiffness for permanent ground support.
The installation process begins with drilling using the bolt itself as the drill rod. Water or air is injected through the central hole to flush out cuttings, preventing borehole collapse. Once the desired depth is reached, grout is pumped through the same central hole, filling the annular space and encapsulating the bolt. This one-step process eliminates the need for separate drilling and anchor installation, reducing time and labor costs.
The GFRP material offers additional benefits, including corrosion resistance, which is essential for permanent applications in aggressive environments. Unlike steel, GFRP does not rust, eliminating the need for protective coatings and reducing long-term maintenance. The lightweight nature of the bolt also reduces handling effort and transportation costs, making it a cost-effective choice for large-scale projects.
The following table summarizes the key technical specifications of the SupFRP GFRP SDA Bolt:
| Model | Outside Diameter (mm) | Internal Diameter (mm) | Nominal Cross-sectional Area (mm²) | Guaranteed Tensile Load (kN) | Torsion Strength (Nm) | Weight (kg/m) | Thread Type (ISO) |
|---|---|---|---|---|---|---|---|
| H25S | 25 | 12 | 250 | 220 | 180 | 0.63 | R25 |
| H28S | 28 | 14 | 310 | 280 | 250 | 0.86 | R28 |
| H32S | 32 | 15 | 400 | 365 | 360 | 0.99 | R32 |
| H38S | 38 | 20 | 540 | 490 | 450 | 1.33 | R38 |
The hollow bar anchor design with ISO standard thread profiles (R25, R28, R32, R38) ensures compatibility with standard drilling and anchoring equipment. The waved thread structure enhances the bonding between the bolt and grout, improving load transfer. The central hole allows efficient flushing of drill cuttings and subsequent grouting, which is critical for achieving full encapsulation in soft ground. The cuttability of the GFRP material allows the bolt to be easily cut by tunnel boring machines, preventing damage to cutting tools and reducing downtime.
The SupFRP GFRP SDA Bolt is designed for a wide range of geotechnical applications, including face stabilization, forepoling, slope stabilization, ground support in soft rock, roof and wall bolting. Its ability to combine drilling, grouting, and anchoring makes it ideal for projects where time and safety are paramount. In tunneling, it provides immediate support to the excavation face, preventing collapse in weak ground. For slope stabilization, it offers long-term reinforcement against landslides and erosion.
Key applications include:
SupAnchor offers the SupFRP GFRP SDA Bolt in standard lengths ranging from 2 to 11 meters, with custom lengths available upon request. The bolt can be easily cut on-site to match required lengths, thanks to its cuttability. This flexibility reduces waste and ensures precise installation.
In one highway project in a mountainous region, the SupFRP GFRP SDA Bolt was used for slope stabilization. The soft clay and weathered rock made traditional soil nails ineffective, but the self-drilling capability allowed installation without pre-drilling, and the high tensile strength ensured long-term stability.
The self drilling anchor bolt is particularly effective in conditions where conventional drilling and anchoring are challenging, such as collapsing boreholes or water-sensitive soils. Its permanent application capability ensures long-term structural integrity, making it a reliable choice for infrastructure projects worldwide.
As global infrastructure development accelerates, the demand for efficient and reliable geotechnical reinforcement systems continues to grow. The SupFRP GFRP SDA Bolt addresses key challenges in tunneling, mining, and civil engineering by reducing installation time, improving safety, and lowering overall project costs. Its high tensile strength and torsion resistance enable it to meet the rigorous demands of modern construction.
The self drilling anchor system market is expanding, driven by urbanization and the need for underground space. SupAnchor's product stands out due to its combination of GFRP material properties, which offer corrosion resistance and cuttability features not available in traditional steel anchors. This makes the SupFRP GFRP SDA Bolt a valuable tool for projects in aggressive environments or where future excavation may intersect the anchors.
For contractors, the integration of drilling and anchoring reduces the need for specialized equipment and skilled labor, further lowering project costs. The high installation speed also allows for faster project completion, which is critical in urban areas where traffic disruption must be minimized.
Furthermore, GFRP anchors are non-corrosive, eliminating the need for protective coatings and reducing long-term maintenance. Their lightweight nature also lowers transportation and handling costs, contributing to overall project sustainability.
SupAnchor, as a leading soil nail system manufacturer and ground anchor bolt factory, has consistently demonstrated a commitment to professional, innovative, and collaborative solutions. The company invests heavily in research and development to bring advanced products like the SupFRP GFRP SDA Bolt to market. All products are manufactured under strict quality control and comply with ISO standards, ensuring reliability and performance.
SupAnchor holds ISO 9001, ISO 14001, and OHSAS 18001 certifications, reflecting its commitment to quality, environmental management, and occupational health and safety. The company has participated in landmark projects such as the expansion of European metro systems and major hydroelectric tunnels in South America.
With a global footprint, SupAnchor has supplied anchoring solutions for numerous flagship projects, including high-speed railways, metro systems, and major tunnels. The company's engineering team works closely with contractors to customize solutions for specific geological conditions, embodying a collaborative approach that drives project success.
In conclusion, the SupFRP GFRP SDA Bolt is a testament to SupAnchor's engineering excellence and its dedication to advancing geotechnical technology. As the industry looks for safer, faster, and more sustainable anchoring methods, products like this will play a crucial role in shaping the future of underground construction.
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