In a densely populated European city, a major underground transportation project is overcoming challenging ground conditions with the help of a self drilling anchor system from SupAnchor. The tunnel, part of a new metro line, passes through mixed geology comprising soft clay, water-bearing gravel, and fractured bedrock. To ensure stability during excavation and long-term structural integrity, engineers selected a self drilling anchor bolt solution that combines drilling, grouting, and reinforcement in a single operation.
At the construction site, crews are installing hollow bar anchors as forepoling and face support. The self drilling anchor system allows rapid installation without the need for casing, significantly reducing downtime. The anchors are advanced using a rotary percussive drill, with grout simultaneously injected through the hollow bar to stabilize the surrounding soil.
The following table summarizes the key specifications of the ground anchor bolt factory products used:
| Parameter | Value |
|---|---|
| Diameter (mm) | 32, 38, 51 |
| Tensile Strength (kN) | 200 – 600 |
| Length (m) | 3 – 12 (customizable) |
| Corrosion Protection | Hot-dip galvanized, epoxy-coated, or dual protection |
| Thread Type | R32, R38, R51 (rope thread) |
The self drilling anchor for retaining walls and tunnel faces provided immediate stabilization, especially in sections with high water pressure. The hollow bar design allows grout to be injected while drilling, ensuring full encapsulation of the anchor and creating a micropile hollow bar anchor effect that reinforces the ground.
The project’s geotechnical team noted that the drill-and-grout bolt process reduced surface settlement by over 40% compared to conventional methods. The geotechnical reinforcement system also minimized disruption to adjacent buildings and utilities, a critical requirement in the urban environment. With up to 2,000 anchors installed per month, the soil nail system manufacturer (SupAnchor) ensured timely delivery and consistent quality.
This case exemplifies how ground stabilization anchor systems are meeting the demands of modern infrastructure. Urban tunneling, slope stabilization, and underground mining increasingly rely on rock bolt for underground mining and civil engineering applications. The SDA bolt factory direct supply model ensures cost-effective solutions without compromising performance.
As cities expand and transportation networks grow, the need for reliable anchor bolt system for geotechnical engineering becomes paramount. SupAnchor’s innovation contributes to safer, faster, and more sustainable construction practices globally.
SupAnchor, established in 2008, has become a leading ground anchor bolt factory with ISO 9001 and CE certifications. Their self drilling anchor system has been deployed in over 50 countries for projects ranging from high-speed rail to deep excavations. With a dedicated R&D team and a self drilling bolt for civil engineering portfolio, the company embodies professionalism, innovation, and collaboration.
Key highlights of SupAnchor’s approach include:
This urban tunnelling project stands as a testament to how advanced ground support solutions can overcome complex geological challenges while prioritizing safety and efficiency.
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