Coupler Box

The Couplerbox is a combination of the Startabox perforated case assembly and RFA Demu Rebar coupler system, in a Single unit. Couplerbox has been developed to offer a rebar continuity system for larger bar diameters and where a high concentration of reinforcement or other factors prohibit the use of a rebend system, such as Startabox.

The recent introduction of the Eurocode 2 building regulations has now seen arequirement for much longer lap lengths, making the use of couplers more economicaland restricting the manufacturing possibilities of rebend continuity systems.

The unit is cast in to a first concrete pour to provide threaded connections to the subsequent, adjoining concrete pour. When in use and once the lid is removed, avery neat and keyed joint is produced, requiring no need for scabbling, retarders orjetwashing of the joint. As the Couplerbox is produced in a factory environment, thecoupled bars are at the correct bar centres specified and not subject to errors on site.

The system was initially developed to offer a reinforcement continuity product for the areas where a rebend system was being specified, but in a larger bar diameter than possible to produce. Without the requirement to rebend reinforcing bar, diameters of up to 32mm rebar can be produced in the Couplerbox system.

The Couplerbox has been further introduced to solve the problem of locating rows of individual coupled bars especially with the use of some types of moving formwork systems such as slipform rigs. Coupled bars can become easily displaced and slip back from the concrete surface making location and preparation for future use a time consuming and costly process requiring the use of mechanical equipment in a difficult environment. If coupled bars cannot be located, rectification works can be required.

Applications

Couplerbox has the potential to be used in many concrete joints requiring a connection for reinforcement. It is especially suited and useful in applications where there is a requirement to fix many coupled bars and where climbing formwork systems are being used.

Energy from Waste Facilities

Slipform Systems

Water Treatment Works

Diaphragm Walls

High Rise Construction

Composite Floors