Mechanical rebar connections, also known as mechanical splices or mechanical coupler, are used to join lengths of rebar together to transfer forces from one steel rebar to another.
The rebar couplers can be advantages in comparison with conventional methods of lap splicing because of requirement of less steel for overlapping. It is more effective in the seismic detailing to avoid reinforcement congestion problems.
Types of conjunction
1. Upsetting splice is a parallel threaded rebar mechanical splice designed for the connection of concrete reinforcement bars, for diameters 16-40mm.
The full performance of upsetting rebar splices is stronger than the reinforcement bar and guarantees bar break under tensile stress.
PROFESSING STEP
The ends of the bars to be jointed are cut square and enlarged by cold forging to increase their core diameter and so ensure that the joint is stronger than the bar. The couplers are usually supplied attached to the reinforcing bar.
Step1 Use the upsetting machine to thicken the end of rebar.
Step2 Use the steel bar threading (cut) machine to make thread on the end of rebar.
Step3 Connect the two rebar end with the upsetting rebar couplers.
2. Parallel Rolling Threading Splice
Machining diameter (mm): 14- 40
PROCESSING STEP
Rib peeling-thread rolling-connecting with rebar coupler
3.Pressing Splice
Processing step
1.Marking the sleeve and the bars, prepare the hydraulic tool, hydraulic pump and place the proper grip dies.
2.Insert the sleeve half way onto the continuation bar, using the marking as guide.
3.Start applying the required pressure on the sleeve.
4.Stop the swaging at the specified pressure for the given bar diameter and repeat this process as many times as required per model.
5.Place the continuation bars into the sleeves of the first bar and repeat swaging process on the continuation bar.