Post-tensioned and lightened slabs with U-Boot® Beton for the multi-level parking in Reims

To improve the slabs’ performances, minimizing labour costs and raw materials used, the lightening system U-Boot® Beton has been included on the project for the realization of lightened slabs coupled with a post-tension system.

The multi-level car park “République” in Reims, finished in October 2020 and built of reinforced concrete, has a capacity of 745 parks reachable via ramps that allow access to vehicles up to the roof.

In order to optimize the inner spaces of circulation and to add two rows of car parks, the project had to be realized with 16 m large spans. The designers decided to use lightened slabs with U-Boot® Beton in reinforced concrete coupled with a post-tension system. The presence of the two technologies made it possible to achieve the goal and create the slabs without building pillars in the central areas and thus maintain the project spans of 16 m.

Daliform Group company supplied the elements U-Boot® Beton, that installed as disposable formworks directly on the horizontal shuttering, create the voids inside the slab.

Due to the lay in rows, they create ribs all along the slab length, where sheathed and greased prestressing strands and passive steel are laid. As the consequence, the prestressing steel benefits from the maximum possible lever arm for 40 cm of slab thickness, while the slab weight is considerably lightened.

Once again, the use of U-Boot® Beton has proven to be the ideal technological solution for the realization of a work that needs great spans and great architectural freedom, which allows to use the inner spaces on the best way. In addition, the reduction of the overall load of the structure has allowed an important optimization of the vertical bearing structures and foundation structures.