Connecting reinforcement with GEWl  reinforcing steel, high-strength reinforcing steel GEWI-Plus or connection solution of normal reinforcement. 

GEWI reinforcement steel 

GEWl reinforcing steel complies with the following specifications: 

  • EMEA: B500B steel, in accordance with DIN 488 

  • North America: ASTM A615 

The rolled-on thread on both sides forms a left-hand thread along the entire bar length—providing excellent connecting reinforcement on challenging job sites.  

The GEWl System has been developed and optimized over time. A large range of products is now available for almost any kind of application. 

GEWI reinforcement is used in 

The GEWl System offers distinct advantages in heavily reinforced structural elements where the distances between individual reinforcing bars can be problematic. It also achieves excellent results in the end anchorage area. 

The anchor lengths of reinforcing bars can be reduced to a minimum using anchor pieces and plate anchorages significantly reducing the amount of steel and concrete needed.   

How the GEWI systems work 

The coarse and extremely robust GEWl® Thread means that GEWl® Threadbars and nuts are designed for on-site use and work, even when extremely dirty. 

High strength reinforcement, comprising GEWI-Plus, is used to  

  •  Reduce the reinforcement density of conventional grade 500 reinforcement in structural applications, by replacing it with high strength GEWI-Plus (grade 670) reinforcement.  

Through the use of high strength GEWI-plus reinforcement, the quantity of reinforcing bars within compression loaded columns can be reduced.  Furthermore, the cross section of these columns can also be reduced, enabling the amount of floor space within high rise buildings to be increased.  Additionally, GEWI-Plus high strength reinforcement can also be used in shear walls or members designed to resist lateral loading.  

Connection of reinforcing bars with normal ribs 

The extruded coupler splice, the rebar connector system, was developed for realizing reinforcing connections in large numbers or in conditions with very limited space.  

When realizing a rebar connector coupler splice, two reinforcing bars are connected by extruding a coupler that has been placed onto both ends of the reinforcing bars.  

The extrusion process for rebar connector systems 

A high amount of pressure is used to push the reducing ring over the coupler. The reducing ring significantly reduces the exterior diameter of the coupler, creating a force-fit connection between rebar and coupler. 

Both reinforcing steels with normal deformations and GEWl® reinforcing steel Threadbars can be spliced using the rebar connector system meaning reinforcing bars that have already been installed can be coupled to a GEWl® connecting bar with ease. 

 The rebar connector system is also suitable for many similar reinforcing steel bars like the Austrian ARI and ARI-G, and suitability tests can be performed for special applications. 

The corresponding extruding equipment has been kept slim to ensure an economical realization of the connections in minimal space and in areas with tight reinforcement layers. Up to 30 connections per hour are possible if installation is done professionally by trained personnel. 



Hot rolled threadbar 

Steel grade same as B 500 reinforcing steels 

Swaged rebar connector coupler system for dynamic loadings 

Cut and bent to standard reinforcement shape codes 

High Reinforcement

High grade steel (670 / 800 MPa) 

Hot rolled threadbar  

Righthand thread with thread pitch of d/3  

Couplers and nuts to suit