Rebar Couplers

High-Performance Hydraulic Cold Swaging Solution for Rebar Connections / Cold Swaging Mechanical Splicing Solution

One: Proposal Summary

This proposal outlines a mechanical splicing solution utilizing cold swaging technology. By using a high-pressure hydraulic crimping machine, a seamless steel sleeve is deformed onto the ends of ribbed reinforcing bars, creating a permanent mechanical interlock that replaces traditional welding or lap splicing.

❶.Technical Specifications

Applicable Rebar Diameters: 16mm – 42mm (ASTM #5 to #12).

Coupler Material: Low-carbon high-ductility seamless steel.

Splicing Type: Cold-pressed mechanical joint.

Compliance Standards: Meets ACI 318, Eurocode 2, and BS 8110 (Type 1 & 2) tensile requirements.

❷. Equipment Features (Swaging Machine)

High-Force Hydraulic System: Delivers consistent tonnage to ensure full volumetric flow of the sleeve material into rebar ribs.

Precision Tooling: Interchangeable hardened steel dies designed for specific rebar grades and rib profiles.

Ergonomic Operation: Available in both stationary (factory line) and portable (on-site) configurations.

Automatic Pressure Relief: Integrated sensors to stop the cycle once the target compression ratio is reached, ensuring quality consistency.

❸. The Swaging Process

Preparation: Clean the rebar ends of excessive rust or debris.

Marking: Mark the insertion depth on the rebar to ensure the sleeve is centered.

Positioning: Slide the sleeve onto the first bar and insert the second bar.

Crimping: Activate the hydraulic press. The dies compress the sleeve onto the rebar in sections (radial or longitudinal).

Inspection: Visual check of the "after-press" diameter using a limit gauge.

❹. Key Advantages

Superior Strength: Achieves "Bar-Break" performance; the connection is stronger than the parent metal.

All-Weather Reliability: Unlike welding, swaging can be performed in rain, wind, or extreme temperatures without affecting joint integrity.

Process Traceability: Hydraulic parameters can be monitored to ensure every joint meets safety standards.

Cost-Efficiency: Reduces steel wastage compared to lap splicing and requires less skilled labor than specialized welding.

❺. Quality Assurance

Tensile Testing: Random sampling for laboratory pull tests.

Dimensional Verification: Gauging the reduction in sleeve diameter to confirm sufficient deformation.

Two: Key Factors for Rebar Swaging Solutions

Material Compatibility: The sleeve (coupler) must have specific ductility and hardness levels to deform under pressure without cracking, while the rebar’s rib pattern must be sharp enough for the sleeve to "bite" into.

Compression Force & Pressure Control: Precise hydraulic pressure ensures the sleeve flows into the rebar ribs. Under-crimping leads to slippage; over-crimping can embrittle the steel or cause stress fractures.

Dies Design: The mold geometry (usually hexagonal or cylindrical) must match the specific diameter of the rebar (e.g., #8, #10, or 25mm, 32mm) to ensure uniform 360° compression.

Elongation and Tensile Requirements: The joint must typically meet "Bar-Break" standards, meaning the rebar should fail before the crimped connection does during a pull test.

Automation & Efficiency: For large-scale infrastructure (bridges, nuclear plants), the speed of the crimping cycle and the portability of the machine are vital for site productivity.

Three: When crimping, there are some key points should be know clearly.

Reinforcement couplers which offer a more reliable and cost-effective alternative for splicing reinforcement bars (rebars) in reinforced concrete construction than lap splicing.

❶, What material of couplers ?

❷, Thickness of couplers"s wall ?

❸, Target crimping length ?

❹, Whether the tensile test necessary or not ?

❺, Rebar Couplers for what kind of building purpose ?

Four: Client cases

Five: Get a Free Solution or Quote ?

Are you looking for a reliable & professional solutions for Heavy-Duty Rebar Coupler Swaging ? Please contact with us by Email: quotation@yong-feng.com