Dou­ble-Tee connections

The solution was originally developed for double-tee (DT) elements but can also be used for other types of floor elements, smaller beams, large landing and stair elements, as well as façade panels.

DTS is cast into the precast concrete element. During installation, the telescopic steel tube is extended to provide support against the adjacent structure. This enables fast and efficient installation, while the connection remains concealed in the finished structure.

DTS150 has a documented vertical ultimate load capacity of 150 kN and is designed for a maximum cantilever of 110 mm and a load application point no more than 75 mm from the edge of the DT element.

DTS is particularly suitable where a corbel-free connection with a higher capacity than conventional stair and landing connections is required, without the need for the capacity provided by larger beam-to-column connections.

This makes DTS a flexible solution for precast structures where traditional corbels are undesirable for structural or architectural reasons.

DTS150 has documented technical specifications and a calculation basis for load transfer and anchorage in the precast concrete element. The calculations are based on Eurocode 2 and cover, among other aspects, the required anchorage reinforcement and load transfer around the connection.

The reinforcement and load transfer shall be designed and adapted to the specific precast concrete element by the responsible structural engineer. Example calculations demonstrate how the principle can be adapted to different DT cross-sections and reinforcement arrangements.

The connection can be fire-protected by filling the joint between the DT element and the support with rapid-hardening mortar.

• DT/SDT elements
• Smaller beams
• Large landing and stair elements
• Façade panels
• Other precast concrete elements requiring concealed, corbel-free support