Steel Strand Anchor Cable
What is Steel Strand Anchor Cable?
Steel strand anchor cable is a prestressed anchoring product twisted from multiple high-strength low-relaxation steel wires, commonly adopting the 1×7 structure with a tensile strength grade of 1860MPa. It features high bearing capacity, low stress loss, flexibility and easy construction. It restrains surrounding rock deformation by actively applying prestress, and is widely applied in geotechnical reinforcement projects including mine roadways, tunnels, slope treatment and deep foundation pit support. Matched with anchors, bearing plates and grouting systems, it can form a complete support scheme to effectively enhance rock mass stability and engineering safety factor.
Product Overview
Steel strand anchor cable is a ground support and anchoring product manufactured by twisting high-strength, low-relaxation prestressed steel wires. It typically features a 1×7 structure (one center wire + six outer wires). With ultra-high tensile strength, long-term stress retention and excellent fatigue resistance, it is widely used in geotechnical reinforcement projects such as mine roadways, tunnel engineering, slope stabilization and deep foundation pit support. By applying prestress to actively constrain surrounding rock deformation, it significantly improves the overall stability of rock masses.
This series of steel strand anchor cables is manufactured in strict compliance with domestic and international standards including GB/T 5224 and ASTM A416. Through stabilized heat treatment, it features low relaxation, high elongation and uniform stress distribution. It can be combined with anchorages, bearing plates and grouting pipes to form a complete anchoring system that meets the active support requirements of various geotechnical projects.
Core Advantages
High Load Capacity & Reliable Support
Manufactured from premium high-carbon steel wire with tensile strength up to 1860MPa grade, a single anchor cable provides anchoring force of dozens of tons, effectively controlling surrounding rock deformation and separation, and greatly improving the safety factor of support structures.
Low Relaxation & Sustained Stress
After stabilization tempering treatment, the stress relaxation rate is low. Prestress loss is minimal under long-term loading, and the anchoring force remains consistently stable, ensuring support effectiveness throughout the entire project lifecycle.
Flexible & Construction-Friendly
The multi-strand twisted structure combines strength with flexibility. It can be coiled for transportation and cut on site, facilitating operation in confined spaces such as underground mines and tunnels, and adapting to various borehole diameters and anchoring depths.
Corrosion Resistance & Long Service Life
Surface treatments such as galvanizing and epoxy coating are available, adapting to complex working conditions including humid and corrosive strata, effectively extending project service life and reducing maintenance costs.
Complete Specifications & Customization Available
Covering common nominal diameters including 15.2mm, 17.8mm and 21.6mm, with customizable lengths and complete solutions including anchorages, bearing plates and grouted anchor cables.
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Product Specifications
| Product Model | Nominal Diameter (mm) | Structure | Nominal Cross-Section (mm²) | Tensile Strength Grade (MPa) | Min. Breaking Load (kN) | Elongation | Application |
|---|---|---|---|---|---|---|---|
| 1×7-12.7 | 12.7 | 1×7 | 98.7 | 1860 | ≥183 | ≥3.5% | Small roadways, temporary support |
| 1×7-15.2 | 15.20 | 1×7 | 140.0 | 1860 | ≥260 | ≥3.5% | Mine roadways, slope support (standard) |
| 1×7-17.8 | 17.80 | 1×7 | 191.0 | 1860 | ≥353 | ≥3.5% | Large-section roadways, deep foundation pits |
| 1×7-21.6 | 21.60 | 1×7 | 285.0 | 1860 | ≥530 | ≥3.5% | High-stress roadways, heavy-duty support |
| 1×19-21.8 | 21.80 | 1×19 | 285.0 | 1770 | ≥504 | ≥3.5% | Large-diameter deep-hole anchoring |
Application Scenarios
Mine Roadway Support
Active roof and side support in coal mines, metal mines and other underground roadways, effectively controlling surrounding rock convergence, preventing roof falls and rib spalling, and ensuring safe mining operations.
Tunnel & Underground Engineering
Primary support and advance support for railway, highway tunnels and subway stations, forming a combined support system with steel arches and shotcrete.
Slope & Landslide Stabilization
Slope reinforcement and landslide control for highways, railways and water conservancy projects, improving slope anti-sliding stability through prestressed anchor cables.
Deep Foundation Pit Support
Retaining structures for deep foundation pits in high-rise buildings and underground space development, used with soldier piles and diaphragm walls to control pit deformation and protect the surrounding environment.
Hydropower Engineering
Rock mass reinforcement for dams, tunnels and surge shafts in hydraulic structures, withstanding high water pressure and surrounding rock stress to ensure long-term structural safety.
Bridge & Structural Reinforcement
Foundation anchoring and structural reinforcement for bridge piers and building foundations, enhancing overall load-bearing capacity and seismic performance.
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Structural Details
Steel strand anchor cable adopts a standard 1×7 twisted structure, consisting of one center wire and six outer wires tightly twisted in the same helical direction, ensuring uniform stress distribution across all wires, a compact cross-section, full engagement with anchorage wedges and high anchoring efficiency. The wires are made of premium high-carbon steel processed through multiple cold drawing and heat treatment processes, featuring uniform sorbite structure with both high strength and good toughness. The standard surface is phosphated, with hot-dip galvanized, epoxy-coated and other anti-corrosion options available upon request. Paired with wedge-type anchorages, spherical bearing plates, W-shaped steel straps and grouting systems, it forms a complete active support anchoring system.
FAQ
What is the difference between steel strand anchor cables and ordinary rock bolts?
Anchor cables are twisted from multiple high-strength steel wires — higher strength, greater load capacity, and prestressed active support. Rock bolts are single steel rods with lower strength, mainly passive suspension. Anchor cables better suit complex conditions like large spans and high stress.
How to select the appropriate anchor cable specification?
Select based on rock grade, design load, borehole diameter and anchoring depth. Standard roadways commonly use φ15.2mm/1860MPa; large-section or high-stress areas may use φ17.8mm or φ21.6mm.
How is anchor cable length determined?
Total length = anchorage section (≥2–3m) + free section (per loosening zone depth) + exposed tensioning section (200–300mm reserved), subject to specific project design.
What anti-corrosion measures are available?
Four main options: full-length grout bonding, hot-dip galvanizing, epoxy coating and unbonded sheath. Selected based on environmental corrosion grade and service life.
What precautions apply to tensioning?
Verify anchor integrity and grout strength before tensioning; load in stages and lock after stabilization; record elongation for verification; never arc-cut exposed ends — use abrasive saw cold cut instead.
Contact Us for Custom Solutions
The above are standard specifications for reference. Actual projects often require targeted anchoring solutions due to varying surrounding rock conditions, load levels and construction environments. With years of experience in mining and geotechnical support products, we can customize cable diameter, strength grade, length and anti-corrosion solutions to your needs, and supply a full range of matching accessories including anchorages, bearing plates, steel straps and grouting pipes. We support large-volume export and OEM cooperation. For detailed quotations, samples or exclusive project solutions, please contact our sales engineers — we will provide cost-effective anchoring and support solutions tailored to your specific working conditions.
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