Stair-landing connections
The efficient, economic and sustainable way to connect prefab concrete stairs.
Made in Norway
Invisible Connections stair connections have these benefits:
- Corbel-free connections
- Fast installation on construction site
- Less crane use
- Thinner slabs
- Impact sound reduction
- Safe to install
- Fire protected
- Standard reinforcement
- No welding, bolting or shimming on site
- Access stairs during the construction period
- ETA approved and tested solution
- Telescopic
- Made in Norway
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Both TSS and RVK provide concealed connections for precast stairs and landings. The main practical difference is how the inner tube is extended after the element has been installed.
TSS, Terrazzo Stair Support
The inner tube is extended using a wire. This leaves no visible marks on the surface, making TSS particularly suitable for terrazzo and other finished surfaces.
RVK, Repos Vegg Konsollfritt
The inner tube is extended through an opening from the top of the landing. After installation, the opening is grouted, leaving the grouted area visible on the surface.
TSS 25 L is designed for connecting the stair flight itself to the landing. This differs from the standard TSS, which is installed in the landing.
TSS 25 L is a compact 25 kN connection that can replace a traditional corbel solution between the stair flight and landing. It is supplied with integrated reinforcement, continuous height adjustment and an integrated lifting function, helping to simplify production and ensure fast and safe installation.
To achieve optimal load transfer, TSS/RVK connections should be positioned as close to the edge of the landing as possible. This reduces loading at the front and helps minimise the risk of negative reaction forces and uplift at the rear of the landing.
For selection of the appropriate connection and verification of design loads, IC's calculation tool for TSS and RVK is recommended.
The tool makes it easier for consulting engineers and structural engineers to calculate the design loads acting on the connections between stair flights and landings.
The tool calculates, among other parameters, ULS loads and vertical reaction forces.
It also checks the risk of uplift at the rear connections under temporary loading conditions, providing a reliable basis for selecting and positioning the connections.
Standardised reinforcement solutions have been developed for TSS/RVK connections between landings and walls. These are described in Memo 55.
TSS 25 L is also supplied with integrated reinforcement comprising flat steel bars and a rear plate, simplifying installation of the connection within the precast element.
TSS and RVK connections are incorporated into the structure and protected after installation. With sufficient concrete cover, the connections can be designed to meet the applicable fire resistance requirements in accordance with the Eurocodes.
TSS and RVK systems can be combined with solutions for reducing impact sound transmission between stairs, landings and adjoining structures.
Elastomers and other acoustic isolation components can be used to reduce the transmission of structure-borne sound from the staircase to the surrounding building structure.
