First, the cold upsetting process increases the effective cross-sectional area at the bar end to compensate for the reduction caused by thread cutting.
Left-right hand parallel thread couplers are mainly used for rebar connection in scenarios where both rebars are non-rotatable and construction space is limited.
When bars of different sizes need to be spliced, it is not always possible to reduce the size of the larger bar end and use a standard coupler.
For composite construction where concrete reinforcement bars require rigid force-transfer connections to steel structural members (such as steel columns, steel beams and embedded steel plates), weldable couplers are the dedicated targeted solution.
Headed bars are reinforcing steel bars equipped with a forged or mechanically attached head at the end, designed to replace conventional straight or bent anchorage details.
Caging Splices are a specialized mechanical splicing system designed for situations where reinforcing bars cannot be positioned butt-to-butt and rotation is not feasible, which is common in rebar cage fabrication and congested reinforcement assemblies.
When bars need to be spliced without thread machining, it is not always practical to prepare threaded ends on-site or rely on conventional lap splices.
The transverse and longitudinal ribs at the end of the steel bar are partially removed by cutting, ensuring the column diameter before thread rolling reaches a uniform size. The bar is then rolled into straight threads using thread rolling wheels, and finally connected with a specially designed straight-threaded coupler.
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