Rebar couplers are used in reinforced concrete structures to replace normal rebar lap joints. The couplers are also suitable for use in reinforced concrete columns and walls. Each rebar coupler consists of a piece of rebar equipped with a thread and coupler sleeve at the right end as viewed in the direction of installation. In construction joints, rebar couplers can be used to replace all pieces of rebar going through the formwork.
WHY USE REBAR COUPLERS?
The Traditional methods of lapped joints are not always an appropriate means of connecting reinforcing bars. Lapped joints are dependent upon the concrete for load transfer. The use of laps can be time-consuming in terms of design and installation and the increased amount of rebar creates congestion within the concrete.
Couplers are designed to
mechanically join two bars together. By creating an end-to-end bar connection, a continuous load path is created from
one bar to another that is independent of the condition and quality of the
concrete. Mechanical
splices are reliable under conditions of cyclic loading into the inelastic
range and prove to be advantageous at the locations where inelastic yielding
may occur. BENEFITS
OF COUPLERS
Spliced rebar performs like
continuous reinforcement due to the mechanical joint, unlike lapping which has
a complete dependency on concrete.
Steel wastage is reduced
significantly. Using
couplers save lap-length steel. A 12m rebar can be divided into 3m or 4m as bars as required, which prevents the wastage of end pieces of steel.
Staggering of bars not required.
Bar cross-sectional area is not reduced.
Couplers are used as a replacement for
dowel bars which also saves formwork material.
Steel congestion is reduced due to
the elimination of laps.
Using couplers provides superior cyclic performance as compared to the lap joint.
Easy to install and no torque wrench
required. FEATURES
OF COUPLERS EN8D material is used for manufacturing couplers. Reinforcing bar couplers with high
carbon contents that have high strength and greater thickness are
more sustainable and effective. Reinforcing bar coupler helps to increase the pace of
execution and the quality of projects.
It can simplify the design and construction
of reinforced concrete and reduce the amount of reinforcement required, which
is now a valuable national resource. No torque wrench is required for assembling, reinforcing bar
couplers. Hand
tightening of the bar or coupler is sufficient.
Our couplers can be used in power
plants, bridges, and all types of R.C.C structures CODE SPECIFICATION In India,
the structural consultant is free to define the code to which the couplers have used the project. I. ACI: 318 – 2008:
Type 1 joint required to achieve 1.25Fy as a minimum, e.g:
For Fe500 the tensile strength
expected is at least 625 N/mm2 (Clause 12.14.3.4).
Type 2 is required to comply with the 1.25Fy requirement and also meet the
specified tensile strength of the rebar.
E.g: For Fe500 the ultimate stress expected from the same is at At least 700 N/mm2. II. BS 8110 – Part 1,
Section 3, 1989:
Specifies tensile testing and slip test for the joint for acceptance of the sample.
Testing the coupler of a precise
type, the permanent elongation after loading to 0.6fy should not exceed 0.1mm. E.g: For grade 460 the tensile strength should exceed 497 N/mm2. III.
IS 1786 –
2008:
Type 1 –
For Fe500 is considered acceptable
for use anywhere in the structure if it meets the ultimate strength of 545 N/mm2 which is much lesser than the 1.25Fy.
(Clause 8.1 –Table 3).
Type 2 – The condition becomes at least 625 N/mm2 as well. IV.
IS 16172 – 2014:
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