In thermally broken precast panels, the connection between the two concrete wythes represents one of the most critical aspects of the element’s behaviour. The system must simultaneously guarantee structural collaboration between the layers, insulation continuity, deformation control and the integration of inserts required during production, handling and installation phases.
The ECO T.T. system has been developed to meet these requirements through a configuration that integrates reinforcement, structural connection and thermal break management within the precast panel. The geometry of the ECO profile and the collaborative behaviour of the two wythes make it possible to obtain lightweight, stiff panels characterised by continuous insulation.
Table of contents
- The role of the connection in thermally broken precast panels
- How the ECO T.T. system keeps the two wythes working together
- Insulation continuity and thermal bridge control
- Reinforcement coplanarity and deformation control
- Integration of lifting, supporting and anchoring inserts
- ECO T.T. within the precast panel production cycle
The role of the connection in thermally broken precast panels
In thermally broken precast panels, the two concrete wythes are separated by a continuous insulation layer. This configuration improves the energy performance of the building envelope but introduces specific issues related to load transfer and the overall behaviour of the panel.
The connection system between the layers must ensure proper transfer of mechanical actions without compromising insulation continuity. At the same time, it must contribute to deformation control during concrete curing, stripping, transportation and site installation.
Without a suitable connection system, problems such as differential deformation between wythes, loss of reinforcement coplanarity, panel bowing and localised thermal bridges may occur.
How the ECO T.T. system keeps the two wythes working together
The ECO T.T. system uses the geometry of the ECO profile to achieve structural collaboration between the two wythes of the precast panel. Thanks to the connection provided by the steel frame, the two concrete portions can work together structurally.
This makes it possible to consider the full panel thickness in the structural behaviour of the element, maintaining slenderness within controlled limits and limiting deformations. Collaboration between the layers also allows high mechanical performance to be achieved even with lightweight panels and significant insulation thicknesses.
The structural configuration of the system also contributes to controlling panel behaviour during the early stages of concrete curing, when the material’s elastic modulus is still low and the risk of deformation is higher.
The following video shows the operation of the ECO T.T. system and its integration into thermally broken precast panels.
Insulation continuity and thermal bridge control
One of the most significant features of the ECO T.T. system is its ability to maintain continuous insulation within the precast panel. The geometry of the ECO frame allows the insulation material to be positioned without significant discontinuities, limiting the formation of localised thermal bridges.
The system configuration also facilitates the integration of metal embeds required for lifting, supporting and anchoring the panel, concentrating any insulation reductions only in the strictly necessary areas.
The thermal behaviour of the panel is assessed through finite element analysis, which makes it possible to realistically consider insulation section variations and the presence of metal components integrated into the system. This approach provides a more accurate evaluation of thermal transmittance and the actual behaviour of the precast panel.
Reinforcement coplanarity and deformation control
The ECO frame configuration is designed to ensure reinforcement coplanarity along the entire length of the precast panel. The interlocking nodes between longitudinal and transverse elements create a stable and interconnected structure from the assembly stage onward.
This behaviour is particularly important during tilt stripping operations, when the concrete may still have low mechanical strength. Under these conditions, proper reinforcement distribution contributes to controlling initial deformations and reducing the risk of cracking.
The stiffness of the system also improves geometric control of the panel, maintaining the intended reinforcement position and reducing the typical issues associated with traditional systems made of elements that are not rigidly connected to each other.
Integration of lifting, supporting and anchoring inserts
The ECO T.T. system is designed to integrate with lifting, supporting and anchoring inserts used in systems for precast elements. The openings in the ECO profile allow the correct positioning of the metal inserts required during the various operational phases of the panel.
The system configuration makes it possible to integrate lifting devices, supporting systems and bracing inserts while maintaining control of panel geometry and limiting interference with the insulation layer.
This allows a more controlled management of metal components integrated into the precast panel, avoiding improvised solutions and improving execution quality during both production and installation.
ECO T.T. within the precast panel production cycle
In addition to structural and thermal aspects, the ECO T.T. system is designed to integrate directly into the production process of precast panels. Rapid frame assembly, lightweight components and reduced operational issues contribute to improved production efficiency.
The greater panel stiffness also allows stripping operations to be managed more effectively even when concrete has low early-age strength. This helps reduce the risk of premature deformation and optimise the production cycle through factors such as stripping times, steam curing and cement dosage.
The system configuration also helps reduce issues related to initial panel bowing and provides greater control over production quality, even for complex configurations or large-size panels.
Within the connection and reinforcement systems developed by B.S. Italia, ECO T.T. represents a specific solution for thermally broken precast panels, designed to integrate structural behaviour, insulation continuity and production control. This category also includes systems such as OMEGA X, developed for connection and support applications in thermally broken precast panels.
