Introduction
Sachi Easybuild is a downstream rebar service, aimed at easing and simplifying current construction practices in India. It carters to every type of reinforcement requirement and redefines the concepts of time and inventory management at site.
SSPL has launched world class couplers for reinforcement bars. These are designed to be used with rebars to avoid lopping and accelerate the speed of construction, increase productivity and simplify design details.
What are couplers?
Couplers are hollow mechanical members used to join reinforcement bars. These are threaded on the inside and are fixed on to the two rebars which are to be joined to form a mechanical joint.
The Threading Process:
Sachi Easybuild couplers are designed in a manner so that their properties are at par with rebars.
Before Joining:
The rebar to be joined are supplied with parallel threads cut onto the ends to be joined.
Prior to thread cutting, the ends are cold forged to the required length and diameter to ensure correctness of fit.
Benefits of using couplers
Reducing Rebar Usage
Lap lengths of the order of 40-50x Diameter, which cannot add any value structurally, are avoided.
Usage of binding wires and difficult handling is avoided.
Higher Structural Integrity
Mechanical joints are less dependent on the concrete for load transfer.
Faster construction, reduced handling and faster assembly ensures quicker installations.
Reducing Congestion
Smooth flow of concrete during pouring and hence, sound structural integrity.
Ideal steel cement ratio ensures optimum steel in structural member cross section.
Easier Future Extensions
It can be installed as provisions for future extensions.
A coupler eliminates the undesired look of extended rebars and the huge amount of concrete braking required during extension.
Current practices in lapping
Lapping of rebars is the most common method of reinforcing bar joints but is not always the most appropriate. The process includes overlapping two bars for a certain lap length and tying them together with the help of binding wires, as a result the overlapped length of rebars is wasted and it leads to greater congestion within the concrete because of the increased amount of rebar used. Also, the task of holding and tying the rebar together is labour intensive and time consuming.
The assembling process
- The two rebars to be joined are supplied with their ends threaded along with the relevant coupler.
- The coupler is screwed onto the member which is already fixed.
- The free rebar is screwed onto the coupler and the assembly is ready.
Applications
- Column lap replacement
- Raft foundations
- Wall to slab connection
- Beam to column connection
- Precast elements
- Future extension/additions
Chemical composition of couplers
| %C | %Mn | %P | %S | %Si | %Cr | %A1 |
|---|---|---|---|---|---|---|
| 0.40/0.45 | 0.70/0.90 | 0.040Max. | 0.040Max. | 0.05/0.35 | Nil | 0.02Min. |
AVAILABILITY
Available in diameters from 16mm to 40mm. Reducer coupler are also available in above range.