Rebar Couplers
Rebar Couplers Rebar Couplers replaces overlapping of Rebar in structures with advantages of – Cost saving, reducing process time, increased strength of joints and adding immense strength to the structure comparatively. More and more engineers are specifying mechanical rebar connections over lapsplices. They’ve found that mechanical connections afford a reliability and consistency that can’t be found with lap splicing.
✓ Mechanical systems are more reliable than lap systems because they don’t depend on the concrete for load transfer.
✓ Mechanical connections offer greater structural integrity. Mechanical splices offer strength and toughness during man-made, seismic or other natural events.
✓ Test Results states that mechanical splices deliver higher performance than typical design lengths for lap splices. This is typically 125% to 150% greater capacity provided by the mechanical splice versus the lap splice.
✓ Lap splicing increases rebar congestion at the lap zone and is one of the major causes for forming rock pockets and voids in the concrete. Mechanical splices eliminate these congestion problems and will make the overall job more cost effective through minimized job site problems.
✓ IS 16172 :2014 ICS 77.140.15 – The Indian standard for Reinforcement Couplers for mechanical splices of bars in concrete.
✓ Characteristics of threads – Standard Metric thread
✓ Preservation of rebar cross section area – 100%.
✓ Built-in safety factor – 40% above required thread area.
✓ Minimum designed yield stress of couplers assembly – 625 N/mm2 at least.
✓ Minimum ultimate tensile stress of coupler assembly – 700 N/mm2 at least.
✓ Cost saving against overlapping
✓ Continuity of reinforcing bars
✓ No congestion of bars in structure
✓ Reduction of construction cycle time
✓ Reduction of steel wastage
✓ Staggering of bars is not required
✓ Dowels avoided, enabling reuse of form work
✓ Allows full ductile elongation of bars
✓ Easy to install because no torque wrenching required
✓ Bar Cross section area is not reduced