User:Beyonce2008~enwiki/Rebar Mechanical Splicing

Rebar Mechanical Splicing is a new technique for splicing rebars. Comparing with technology of lapping and welding, there are the following advantages : 1.Tensile strength is much higher than parent rebar. 2.Splicing speed is 5 times quicker. 3.Saving reinforcement rebar and no pollution.

At present, there are the following kinds of mechanical coupler. 1.Squeezing coupler 2.Taper coupler 3.Coupler with upsetting end 4.Coupler with parallel thread

Taper : When processing minor diameter of thread, the cross-sectional area of rebar has been minished. Thus, rebar yield&tensile strength has been greatly reduced. Usually, it can only reach 85-95% of actual tensile strength of parent material. Upsetting : Rebar end has been enlarged. For this technique, you need two machines , "upsetting machine" and "thread cutting machine ". It needs about more than 10000 usd in total for products of high quality. It is time-consuming and high cost.About ten years ago, it is popular in china. Coupler with parallel thread: Rebar end is not changed. Tensile strength >1.1 *(parent material ). Need one machine and save cost. That is why all contractors in china use this kind of coupler and machine now.