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BT-Spannschloss - Model M12/M16/M20 -Enables Rational and Precise Assemblies
The BT-Spannschloss enables rational and precise assemblies as well as permanent connections of precast concrete elements. By using the BT turnbuckle and corresponding fasteners, precast elements can be joined together without a mineral grout. This eliminates curing times or downtimes due to low temperatures. The connection with the BT-Spannschloss can be fully loaded immediately. The general technical approval (Z-14.4-599) and the European Technical Assessment (ETA 19/0013) certify the reliability of the product. The BT turnbuckle is offered in three sizes – M12, M16 and M20 – and is available in galvanised or stainless steel. On 12 March 2021, BT-Spannschloss M12, M16 and M20 received the CE marking for use in the European Economic Area (EEA).
With the BT-Spannschloss®, precast concrete parts can be connected without any other additional materials or aids. (Connecting concrete)
The joint is immediately fully loadable without consideration of curing times and thus creates a considerable time and cost saving compared to other known systems.
- Dry screw connection without joint grouting, without special tools
- Immediately loadable, no curing times
- Weather-independent installation even at low temperatures or during precipitation
- Dismountable - dismantling of temporarily erected structures possible
- Three-point connection possible
- Angle retaining walls in flood protection
- Residential and commercial construction
- Agricultural facilities (e.g. biogas plants, silos)
- Sewer and civil engineering (e.g. manholes, media channels, amphibian tunnels)
- Temporary structures
The BT clamping system can be used rationally and universally in a wide range of applications. For example, in the assembly and connection of angular supports and shaft elements in road construction and civil engineering, in construction measures in coastal protection areas, in ceiling and wall connections in residential and social construction and many other structural connections of precast concrete elements.
Note: The load capacity of the tensioning system depends largely on the type of anchor used. Several types of authorised anchor systems can be used according to the application requirements (please refer to the manufacturer’s data). In general, the load capacity of the turnbuckle is many times higher than that of the anchor systems.
There is a matching recess body for each of the three sizes of the BT-Spannschloss®. The standard version of the recess body is made of polyethylene and has sloping sides for better stripping. It is possible to adapt the recess bodies in dimension or shape according to customer requirements.
The PE recess bodies are particularly robust and can therefore be reused many times. They enable a particularly stable positioning of the anchors and also ensure sufficient concrete cover for anchors and BT-Spannschloss®. For faster and more reliable application, the recess bodies can be equipped with magnets. Depending on the installation situation, however, it is also possible to screw or drill into the recess bodies if necessary.