Your Complete Guide to Strand Wedge Anchors: Flat and Circular Solutions for Modern Construction

Overview: Matching the Right Anchor to Your Structural Vision

In post-tensioned concrete construction, the choice of anchorage system is pivotal. Strand wedge anchors are the critical link that transfers immense tensile forces from the prestressing steel into the concrete, ensuring structural integrity, longevity, and performance-4. The fundamental decision often comes down to two primary designs: the compact flat anchor and the robust circular anchor. Each serves a distinct purpose, engineered for specific spatial and load-bearing requirements-4.

The table below outlines the key distinctions to guide your initial selection:

Engineering Solutions: How Our Anchors Deliver Performance

Our strand wedge anchors are engineered as complete, high-performance systems. Each anchor head is precision-manufactured from high-grade steel (such as 45# carbon steel or 40Cr alloy)-7-10 and paired with heat-treated wedges of exceptional hardness (typically HRC 58-65)-7 to bite securely into the strand without causing damage.

• The Flat Anchor System: Designed for efficiency in slim profiles. By arranging strands side-by-side in a flat duct, it overcomes the issue of excessive prestress concentration found in grouped anchors, allowing for a more rational stress distribution and a thinner structural section-3. This makes it the preferred solution for the horizontal prestressing of building slabs, bridge decks, and supported continuous beams-3.

• The Circular Anchor System: Built for pure strength and reliability. Its cylindrical design is inherently efficient at distributing radial stresses from multiple strands. Rugged circular wedge blocks are essential for slope stabilisation and specialised post-tensioning, often serving as anchor points at the live ends of systems mounted on wall brackets for ground support-1. This system is typically stressed using a multi-strand jack-4.

Both systems are supplied as a complete kit, including the anchor head, wedges (2 or 3-piece), bearing plate, and spiral reinforcement to control concrete bursting forces at the anchor zone-4-7.

Technical Specifications & Customization

We provide a comprehensive range to match global project standards. Our anchors accommodate standard 15.2mm (0.6”) and 12.7mm strands, with systems also available for larger diameters like 17.8mm-1-3.

• Flat Anchors: Commonly range from 2 to 5 strands in a single plane-10. Custom configurations are available to meet specific design requirements for strand count and head dimensions-3.

• Circular Anchors: Standard units range from 2 to 7 strands for stabilisation work-1, and our multi-strand round anchor systems can be configured for tendons from 4 to 42 strands or more for major bridge and building projects-4-8.

Every component, from the anchor head to the bearing plate, undergoes rigorous quality control. We perform static load testing to validate the anchoring efficiency coefficient, ensuring reliable performance even for short-distance strand anchoring-10.

Application & Installation Best Practices

Correct installation is paramount to achieving the designed load capacity. Our systems are designed for compatibility with standard post-tensioning practices.

For flat anchors, strands are fed through a flat, oval duct and stressed individually using a mono-strand jack-4. For circular anchors in multi-strand applications, strands within a single round duct are often stressed simultaneously using a multi-strand jack-4.

Key installation principles include:

• Ensuring ducts and anchorages are correctly positioned and fixed before concrete pour.

• Using the recommended stressing equipment and following calibrated procedures.

• Employing proper grouting techniques after stressing to fill the ducts for corrosion protection and bond-4.

• Following all safety protocols and manufacturer guidelines during tensioning.

Why Partner With Us

Choosing our strand wedge anchors means investing in reliability backed by engineering excellence. We offer more than just products; we provide integrated solutions. With extensive experience in the industry, we support projects from the design phase through to on-site application.

We maintain strong OEM/ODM capabilities, allowing us to customize anchorages to your precise project specifications and drawings-3. Our commitment to rigorous factory quality control and the ability to conduct tension tests on demand-3 ensures that every shipment meets the highest standards of performance and safety required by modern civil engineering.