The Axial Extrusion Rebar Coupler System provides a fast, secure, and full-strength mechanical connection between deformed reinforcing bars through axial compression, without the need for threading, welding, or heating.

Unlike conventional cold extrusion which applies radial pressure through side crimping, this system uses axial hydraulic force to compress split segments of the sleeve inward from both ends. The result is a tight, uniform bond between the sleeve and the rebars, forming a permanent, slip-free splice capable of transmitting both tension and compression loads.

This technology is particularly suited for congested reinforcement cages and on-site splicing where ease of alignment and speed are critical.

1. Principle of Axial Extrusion Connection

The axial extrusion process uses controlled hydraulic pressure to drive two axial plungers that compress the sleeve along its length. The sleeve is designed with split or segmented clamping pieces, which are forced radially inward during axial compression.

This action plastically deforms the sleeve material, ensuring tight radial grip around the ribbed surface of both rebars. The resulting mechanical interlock guarantees reliable load transfer without slippage.

Process Steps:

1. Bar Preparation – Cut rebar ends square, clean off rust, dust, or oil.

2. Sleeve Assembly – Place the rebars end-to-end inside the split sleeve or multi-segment sleeve body.

3. Fixture Positioning – Insert the assembly into the axial compression fixture or hydraulic clamp bed.

4. Axial Extrusion – Apply hydraulic pressure through the axial press; the end collars compress the segments inward until full deformation is achieved.

5. Inspection – Measure axial shortening and sleeve deformation to confirm compliance with technical standards.

Because the process is cold-formed, the parent rebar retains its original metallurgical properties and yield strength, ensuring consistent performance.

2. System Features and Advantages

Threadless and Weld-Free Connection
No need for bar end threading or on-site welding operations — simplifying logistics and tooling.

Axial Compression Technology
Converts axial hydraulic force into uniform radial pressure, achieving reliable grip and interlock.

Fast Installation and High Efficiency
Each splice can be completed in seconds, ideal for large-scale repetitive connections or automated lines.

Full-Strength Structural Performance
Complies with GB/T 50214, JGJ 107-2016, and ISO 15835 standards for Type I / Type II mechanical splices.

Compact and Easy to Operate
Requires only a horizontal fixture and a compact hydraulic press, suitable for tight working environments.

Safe and Eco-Friendly
No heat, no sparks, no fumes — perfectly suited for enclosed or hazardous environments.

3. Axial Extrusion Equipment

The GLUS Axial Extrusion Press Machine delivers precise axial compression to form stable and repeatable mechanical joints.

Operation Highlights:

• One extrusion cycle per sleeve, completed within 5–10 seconds.

• Automatic pressure feedback control ensures stable forming quality.

• Suitable for horizontal or vertical installation depending on rebar positioning.

• Compatible with multiple sleeve sizes via interchangeable dies and collars.

4. Manufacturing and Quality Control

GLUS axial extrusion sleeves are made from high-strength alloy steel, precision-machined and heat-treated to maintain dimensional stability and toughness.

Key Quality Tests:

• Dimensional inspection (length, inner contour, and collar geometry)

• Axial compression deformation test

• Tensile and slip resistance under ISO 15835 / JGJ107 criteria

• Fatigue and cyclic loading tests for seismic-grade performance

• Metallographic analysis after extrusion to verify cold-form quality

• Laser marking for traceability (batch number and production lot)

All production batches are accompanied by inspection certificates and extrusion force verification data.

5. Applications

• Reinforced concrete columns, beams, and walls

• Precast concrete modules and factory-built components

• Underground and confined space splicing

• Bridge deck and pier reinforcement

• Retrofitting of existing reinforced structures

• High-rise and seismic-resistant concrete frames

6. Conclusion

The GLUS Axial Extrusion Rebar Coupler System represents a new generation of mechanical rebar splicing — combining the simplicity of direct axial compression with the reliability of full-strength performance.

Its split-sleeve design and single-step pressing process enable quick, repeatable, and safe connections in environments where threading or welding is impractical.

With robust quality control, field-proven hydraulic equipment, and compliance with international standards, GLUS delivers a complete solution for modern reinforced concrete engineering — efficient, precise, and built for strength.