Introduction

The Terwa threaded coupler system provides a safe, reliable and efficient method of providing mechanical rebar connections that meet the requirements of BS8110. By increasing the cross sectional area of material at the joint the connection exceeds the tensile and shear capabilities of the parent bar. This attribute means the performance of the coupling can be ignored in any structural assessment. This makes the adoption of the Terwa couplers over standard rebar in lapped joints or stop ends a simple exchange. The system is backed up by a CARES Technical Approval, verifying compliance with BS8110 and EC2 for mechanical reinforcement connections. The characteristics and advantages of the Terwa Rebar Connection System are:

Advantages

 - It is suitable for reinforcement steel with a diameter from 10 mm to 40 mm.

 - CARES Technical Approval. 

 - The full capacity of the bar can be used.

 - Full connection of the reinforcement.

 - Suited for dynamic and seismic loads.

 - Slip value of the system ≤ 0.1 mm.

 - Additional preparation of the reinforcement steel is not necessary.

 - Suitable for all types of reinforcement steel according to British and European Norms.

 - The couplers are designed for reinforcement steel B500B or B500C in accordance with BS4449 and EN 10080 and have a yield strength ≥ 500 MPa and a tensile strength ≥ 550 MPa.

 - The shape, height and type of ribs in the reinforcement steel have no influence on   the connection.

 - The minimum external diameter of the coupler improves concrete cover in lapped   joints, and reduces congestion of reinforcement steel in heavily reinforced structures.

 - Full connection can be achieved without additional locking nuts.

 - Any diameter and length of the reinforcement steel straight or bent can be fitted with a  coupler for easy connection on site.