Mechanical connections

Socket joints are mechanical joints for rebars and are used in reinforced concrete in special cases to reinforcing bars to connect to each other. Usually an overlap joint is used to connect two bars, in which the ends of the rods are placed over a certain length parallel to each other. For use mechanical connections come only if such an overlap joint is not (useful ) is possible, for example, in a very narrow layer of reinforcement, with very large overlap lengths necessary or would interfere if far from a component connection rods outstanding construction progress.

Coupler splices are designed so that the link can accommodate all occurring forces in the concrete and steel forward. Calculated and prepared the terminals according to the current standards for reinforced concrete construction (formerly eg DIN 1045-1, now EC 2-1-1). In Germany mechanical connection means require a general building inspectorate approval or a European Technical Approval.

Screw

A screw connection consists of a screw socket, a pipe in which can be screwed to be connected to the reinforcing bars with internal cut-open thread. The sleeve can be pressed onto one of the rods at the factory, then only needs to be supplemented for the threaded rod. With two threaded sleeves are screwed on both rods to be connected. The rebar must be cut open the appropriate thread in the factory before.

Due to this special machining of the rods and the production of the sleeves a Screw costs considerably more than a lap joint. Depending on the size and type of sleeve does a shock ( a sleeve and cutting two threads) between 15 and 120 euros, whereas in a lap joint, only the steel is additionally located in the impact area caused costs that are at most in the range of a few euros.

Shear bolt sleeves

Another type of mechanical connectors used sleeves with shear bolt. The rods to be joined need not be separately prepared for this connection. The sleeve does not contain threads, but is slightly larger in diameter than the serrated rods and the associated inside. After attaching multiple shear studs are threaded through the sleeve and thereby clamp the reinforcement bar in the socket firmly.

Since the rods must not be prepared in the factory itself, the use of shear studs on sleeves for example, when a change of reinforcement is necessary during construction.