Connection of concrete and precast concrete elements
Tested static safety for your construction
The BT turnbuckle – the next generation in connection technology
An innovative solution for the connection of concrete elements is offered by the tensioning system from B.T. innovation with the turnbuckle®, which can be used for permanent structural connections of precast concrete elements.
The advantage over other types of connection systems lies in the simple but secure connection of Precast concrete elements. Simplicity is provided by the geometrically specified screw system, which allows immediate full load application. The safety of the system is regulated by the load values specified in the DIBt approval. In order to obtain the possibility of a wide range of applications, the turnbuckle system can be combined with the common approved anchor systems (flat steel anchor, shaft anchor, screw anchor). Due to this wide range of applications, the turnbuckle, which is made of heavy-duty cast material, can be used to transmit transverse and longitudinal loads. This means that structural connections with high static loads can also be realized using the turnbuckle system.
- Fast and effective connection of precast concrete elements
- Immediate full load application after mounting
- universal system for many constructive solutions
- Time and cost savings
- No temperature dependence
- Clamping of construction elements without additional materials and special tools
Another decisive advantage is the combinability with our Joint tape RubberElast®. The use of the turnbuckle compresses the RubberElast® to the required width, providing a static connection in combination with additional sealing. Due to its versatility, the turnbuckle is able to securely connect a wide variety of elements. Special applications in the ” concrete waterproofing ” sector can be realized with the combination of the BT turnbuckle® and RubberElast®.
like:
- Media channels
- Water underpasses
- Canal and shaft construction
- Angle support elements
- Civil Engineering
- Cellars/basements for residential and social buildings
The building material concrete is an artificially produced stone from a mixture of cement, water and aggregate (sand and gravel). In its initially pasty state, it can be shaped as desired before it hardens and gains its high compressive strength. The exact composition of the individual components and their optimum ratio to each other are quite decisive for the concrete quality. By mixing in fibers of glass, steel, plastic or textile materials, the bonding matrix of the concrete can be improved. The resulting high strength, durability and surface quality of these high-performance concretes make it possible to produce precast elements with improved properties.
There are two ways of influencing the bonding matrix of concretes: firstly by means of additives and secondly by means of admixtures.
Concrete admixtures are finely dispersed substances that influence the fresh concrete, in terms of its workability, and the hardened concrete, in terms of its strength and impermeability. Examples of such additives are quartz powder, limestone powder, pigments or fly ash. Concrete admixtures are liquid, powdery or granular substances that are added to concrete to improve the properties of the fresh or hardened concrete through chemical and/or physical action. workability, setting, hardening or frost resistance. Examples of such admixtures are concrete plasticizers (BV), retarders (VZ), accelerators (BE) or air entraining agents (LP).
Precast concrete elements are often used for walls, ceilings or columns in storey and hall construction as well as in residential and administrative construction. These elements are connected with prefabricated connecting systems made of steel or cast steel components, which enable easy assembly of the precast elements during construction.
So-called loop connection systems are also widely used. In this method, loops and integrated reinforcing steel are connected by means of grouting mortar. The component joint must first be formed (concrete formwork), so that the grout can fill the cavity. Since load application is only possible after the grout has hardened, the formwork and structural support of the walls must remain in place for at least three to seven days. Another disadvantage is the relatively expensive grout and the limited processing possibilities at negative temperatures.
Expoxy resin EP and polyurethane resin PUR are used as binders. In the case of structures that show cracks or elements that have been damaged by excessive mechanical stress, joints and cracks can thus be permanently repaired and repaired (see also concrete repair).