Rebend connection
A rebend connection is a form of connection of reinforcement to a construction joint in a concrete component . Rebend connections are used when reinforcing steel is to protrude from a concrete surface to be produced, e.g. B. to connect the next component or a second concrete. Rebend connections offer the advantage that a smooth, precisely aligned construction joint can be created with the formwork without having to drill through it. In contrast to screw connections , they are also characterized by low acquisition and installation costs. However, rebend connections are limited by the rod diameter. Usually only connections with bar diameters of up to and including 12 millimeters are possible, or 12 millimeters depending on the profile width.
A rebend connection consists of an elongated, flat metal or plastic box (“storage box”) in which the reinforcing bars that are later to be used as a connection are located. At the back, the ends of these bars look out of the box, either as straight bars or in the form of a U-bracket. The storage box is attached to the formwork with nails or screws before concreting so that the rear ends look into the component to be concreted. After concreting and stripping, the front of the storage box lies in the concrete surface. After removing the cover, the reinforcing steel bars in the box can be bent out ( bent back into the original position ) and used as a connection for the reinforcement of the next concreting section.
The rebend connection was invented in the 1970s by the Swiss foreman Fritz Brechbühler. In a first version, it was reinforcing iron that was poured in a mold with foam. This was very cheap to produce, but tedious on the construction site, as the foam had to be scraped off the profile. Later, the profiles were equipped with steel or plastic covers that guarantee easy stripping. These features have remained the same for all manufacturers to this day.
Fritz Brechbühler was able to produce and sell his successful invention until 1989 under the company "Reinforced Concrete Connections EBEA, Münsingen BE". This is followed by a name change to "ebea System AG, Münsingen BE". The brand name is an acronym for EBEA E isen be ton a onnection. As a result of private money problems, he first sold the company to Aco Passavant AG at the end of the 1990s, which in turn sold this part of Schöck Konstruktions GmbH after just under a year. Schöck, now operating under the name Schöck-ebea, relocated the production of the reinforcement connections including all devices and machines to Hungary near Budapest and continued to produce them there for almost 10 years. Since Schöck wanted to concentrate on its core business (Isokorb), the reinforcement connections, including the production halls, employees and brand name, were sold to what was then Sybaco. Sybaco was an entrepreneur of the Carl Spaeter Group Switzerland and the successor to Betomax Switzerland. The brand name ebea still belongs to the Carl Spaeter Group and only 30 minutes away from Budapest, cantilever plate connections (Isokorb), shear force dowels, punching shear systems and joint solutions are still produced in addition to rebending connections. The ebea rebend connection is still one of the most frequently used products on the European market, along with the Comax rebend connection from Betomax.
Individual evidence
- ^ Hermann Bauer: Construction company . Springer, 2006, ISBN 3-540-32113-6 , pp. 380 .