Timber-concrete-composite (TCC): Future technology for sustainable building

Efficient structural reinforcement with timber-concrete composite screws in new and existing buildings

Special TCC screws are among the most efficient solutions for the structural reinforcement of floor slabs in both new buildings and existing structures undergoing renovation. They ensure a force-fit connection between timber and concrete and make a significant contribution to increasing the load-bearing capacity and rigidity of the overall system.

For this purpose, we offer approved fasteners in accordance with ETA-16/0864: the TCC-II 7.3 and TCC-II 9 composite screws. Their characteristic tooth geometry enables form-fit and force-fit anchoring in concrete, and the specially shaped head ensures optimized interaction with the concrete layer.

Sample design: TCC-II 9 x 230 mm for 10 m ceiling spans

The TCC-II wood-concrete composite screw from our range, with a diameter of 9 mm and a length of 180 mm, has established itself over many years as a reliable solution in precisely this area of construction. However, a longer version would offer a significant advantage for elements with large spans and exploit the full potential in terms of pull-out and stiffness properties.

The following illustration shows an example of a ceiling span of 10 m  with GL24h glulam beams measuring 480 x 160 mm, laid at intervals of 1 m and covered with a 30 mm thick OSB layer and a 60 mm thick reinforced concrete layer. The loads are 3.9 kN/m² as a permanent load and 2.0 kN/m² as a live load within service class 1. The TCC-II wood-concrete composite screw in the 9 x 180 mm version meets the static verification requirements with 96 screws per beam, arranged in two rows.

The calculation with the soon-to-be-available version of the 9 x 230 mm connector shows a reduction in the number of screws required by approximately 40 %.