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The Cold Extrusion Rebar Coupler System provides a full-strength, slip-free mechanical splice between deformed reinforcing bars without threading, welding, or heating.
By applying high-pressure compression through a hydraulic cold extrusion machine, the coupler forms a permanent mechanical bond between the sleeve and the bars, ensuring reliable load transfer under tension, compression, and cyclic conditions.
This system is widely used for on-site splicing, confined spaces, and projects where rebar ends cannot be threaded or heated, such as retrofitting, underwater construction, and precast concrete assembly.
1. Principle of Cold Extrusion Connection
The cold extrusion process uses hydraulic pressure to plastically deform the coupler around the ribbed surface of the rebar.
The deformation causes mechanical interlock and radial compression, ensuring the coupler and bar act as one continuous element.
Process Steps:
Bar Preparation – Cut rebar ends square and remove rust or oil.
Coupler Installation – Insert both bar ends into the sleeve until they meet in the center.
Extrusion – Use the hydraulic extrusion press to apply radial pressure through crimping dies at designated positions along the coupler.
Verification – After extrusion, measure the crimp marks and sleeve deformation to confirm compliance with dimensional and pressure standards.
2. System Features and Advantages
No Threading or Welding Required: Simplifies installation and eliminates specialized threading or welding operations.
Full-Strength Performance: Meets or exceeds Type I and Type II splice performance under GB/T 50214, JGJ 107-2016, and ISO 15835.
High Efficiency: Fast, repeatable, and suitable for large-scale site operations.
Safe and Environmentally Friendly: No sparks, fumes, or noise; ideal for enclosed or hazardous environments.
Versatile Application: Compatible with HRB400, HRB500, and HRBF600 rebars of Ø16–Ø40 mm and above.
3. Cold Extrusion Equipment
The GLUS Hydraulic Cold Extrusion Machine is designed to deliver stable, high-pressure performance for consistent splicing quality.
Main Components:
Hydraulic Pump Unit: Generates extrusion pressure up to 60–80 MPa, driven by an electric or diesel motor.
Handheld Hydraulic Head: Performs extrusion by compressing the coupler at multiple points using hardened crimping dies.
High-Pressure Hose Assembly: Connects pump and head, with quick couplers for fast installation.
Control Valve: Regulates pressure and maintains uniform extrusion force.
Operation Highlights:
Each coupler is extruded in 3–5 positions depending on its diameter.
Extrusion pressure and sequence are automatically controlled to ensure consistent deformation.
Compact size allows operation in tight reinforcement cages or vertical shafts.
4. Manufacturing and Quality Control
GLUS cold extrusion sleeves are made from high-strength seamless steel tubes (20#, 45#) that undergo strict dimensional and hardness control.
Key Quality Tests:
Dimensional accuracy (inner diameter, wall thickness, length)
Extrusion strength and slip tests
Tensile and fatigue testing under ISO 15835 / JGJ107 standards
Hardness and metallographic analysis after extrusion
Each coupler is laser-marked with batch numbers for traceability, and inspection reports are issued for every production lot.
5. Applications
Reinforced concrete columns, beams, and slabs
Bridge piers and deck joints
Precast component connections
Underwater or confined construction zones
Retrofitting and extension of existing structures
Power plants, subway tunnels, and marine infrastructure
6. Conclusion
The GLUS Cold Extrusion Coupler System provides a robust, threadless, and weld-free mechanical rebar connection method — ideal for environments where precision, safety, and ease of use are critical.
Combining high-strength couplers with advanced hydraulic extrusion machines, GLUS delivers a standardized, internationally compliant splicing solution that meets the evolving needs of global reinforced concrete engineering.
