In response to the growing demand for reliable ground support in complex geological conditions, SupAnchor has introduced its SupFRP® GFRP Hollow Injection Bolt—a groundbreaking self drilling anchor system that combines the functions of a rock bolt and injection grouting into a single, high-performance component. This innovation is set to redefine geotechnical reinforcement for infrastructure projects worldwide.
The SupFRP series is engineered to excel in challenging environments such as slope stabilization, tunnel boring machine (TBM) face support, forepoling, and confined ground conditions. With its hollow core design, the bolt allows for high-pressure injection of grouting materials, ensuring full grouting and superior bond strength with the surrounding ground. This drill-and-grout bolt not only simplifies the installation process but also enhances long-term structural integrity.
SupAnchor's GFRP Hollow Injection Bolts are available in multiple dimensions to suit varied project requirements. The key models—H25/220, H28/320, H32/360, H38/490, H22/230, and H25/300—offer a range of outer diameters from 22 mm to 38 mm and guaranteed tensile loads from 220 kN to 490 kN. The following table summarizes the critical technical data for the primary models:
| Model | Outer Diameter (mm) | Inner Diameter (mm) | Guaranteed Tensile Load (kN) | Pressure Resistance (MPa) | Weight (kg/m) |
|---|---|---|---|---|---|
| H25/220 | 25 | 12 | 220 | 5 | 0.64 |
| H28/320 | 28 | 12 | 320 | 5 | 0.88 |
| H32/360 | 32 | 15 | 360 | 5 | 1.20 |
| H38/490 | 38 | 20 | 490 | 5 | 1.5 |
| H22/230 | 22 | 8 | 230 | 18 | 0.58 |
| H25/300 | 25 | 8 | 300 | 30 | 0.79 |
All models feature a waved thread structure that enhances the mechanical interlock with grout, a tensile E-modulus of 45 GPa, and an ultimate strain of 2.0%. The hollow bar anchor design facilitates pressure injection up to 30 MPa in certain models, ensuring thorough grout penetration even in fractured rock masses. The use of glass fiber reinforced polymer (GFRP) provides exceptional corrosion resistance, making these bolts ideal for permanent applications in aggressive environments.
One of the standout advantages is the lightweight nature of the bolts—weighing as little as 0.58 kg/m—which significantly reduces handling effort and improves installation safety. Despite their low weight, the bolts deliver remarkable tensile loads, with the H38/490 reaching 490 kN. The cuttability of GFRP also allows for on-site adjustments without compromising structural performance, a critical feature for TBM and forepoling operations.
The SupFRP GFRP Hollow Injection Bolt is a versatile geotechnical reinforcement system suitable for a wide array of projects. In slope stabilization, the bolt's ability to combine drilling, grouting, and anchoring in one step accelerates construction while improving soil cohesion. During TBM excavation, it serves as a reliable self drilling anchor bolt for face support, preventing collapses in weak ground. The high pressure resistance and full grouting capability address the challenges of confined ground conditions, where precise load transfer and minimal disturbance are essential.
Geotechnical engineers worldwide are increasingly turning to hollow bar anchors for soft rock stabilization and permanent tunnel linings. The SupFRP series meets these demands with a drill-and-grout bolt that simplifies logistics and reduces the need for multiple components. As a leading soil nail system manufacturer, SupAnchor ensures that each bolt adheres to stringent quality standards, backed by ISO certifications and extensive field testing.
Major infrastructure undertakings—from high-speed rail networks to urban metro expansions—require ground anchor solutions that can withstand both static and dynamic loads over decades. The GFRP Hollow Injection Bolt's high corrosion resistance and durable bond force make it a preferred choice for ground anchor bolt factories supplying long-life projects. Its ability to be left in the borehole after injection as a permanent load-bearing element reduces material waste and labor costs, aligning with sustainable construction practices.
SupAnchor has a proven track record in delivering innovative self drilling anchor systems across continents. By continuously investing in R&D, the company has secured a portfolio of patents and certifications that underscore its commitment to professional, innovative, and collaborative partnerships. The launch of the SupFRP series reinforces SupAnchor's position as a top-tier anchor bolt manufacturer with a global presence.
As the construction industry evolves, the need for reliable, efficient, and durable ground support will only grow. SupAnchor's GFRP Hollow Injection Bolts represent a significant step forward in geotechnical engineering, offering a blend of performance, ease of use, and environmental resistance that sets a new benchmark for hollow injection bolts worldwide.
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