What is used to join reinforcement steel bars instead of lapping

archdevil

Royal Member
Instead of lapping of bars those reinforcement steel bars joined together directly, what is the name of that? can anyone tell me.
Rebar Coupler.jpg
 

amd007

Elite Member
In technical terms, this is called as a MECHANICAL SPLICE.... or a REINFORCEMENT COUPLER

Mechanical means of splicing of reinforcement bars involve joining of two reinforcement bars end to end using a reinforcement coupler and is a relatively new method being adopted in some important projects.

Mechanical splices may be reliable under conditions of cyclic loading into the inelastic range and may also be advantageous at locations where inelastic yielding may occur.

Mechanical splicing of large diameter bars is often advantageous as this results in less congestion during concreting and faster construction. However, the condition and quality of the concrete and minimum clear cover requirements are to be ensured even in case of mechanical splicing of bars.

Further, the material of the reinforcement coupler should be compatible with the material of the reinforcement bar to be spliced and as well as with the concrete.

IS 16172 : 2014 - Reinforcement Couplers for Mechanical Splices of Bars in Concrete — Specification Refer to this Code for complete details. Its available online which you may download.


Some excerpts from the code mentioned below:

3 TERMINOLOGY

For the purpose of this standard, the terms and definitions given in IS 1786 and the following shall apply.

3.1 Mechanical Splice — Complete assembly of a coupler, or an end bearing sleeve including any additional intervening material or other components providing a splice of two reinforcing bars.

3.2 Reinforcement Coupler — Coupling sleeve or threaded coupler for mechanical splices of reinforcement bars for the purpose of providing transfer of axial tensile force and/or compressive force from one bar to the other, where,
a) coupling sleeve is a device fitting over the ends of two reinforcing bars, and b) threaded coupler is a threaded device for joining reinforcing bars with matching threads.

(please refer IS 16172:2014 for complete information and details)
 
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