Lost formwork, Driebergen Zeist

In the outdoor space at Driebergen-Zeist, several elements in the factory were made with a concrete printer. In addition to the retaining wall of an outflow, four kidney-shaped tree planters, ranging from 30 to 80 meters long, were printed in our 3D concrete printer.

‘’The tree containers had such an organic shape that traditional formwork was expensive. By printing the walls, there is a lot of freedom in shape without the limitations of traditional formwork. Additionally, it is a relatively simple construction and does not experience large forces,” says Keijser.

The printed walls have a thickness of 50 mm. During the delivery and installation of the first elements, it turned out that the lifting provisions were not optimal. “That is an example of the learning process. You can print walls perfectly in the factory, but then you also have to think about the processing in practice. Collapsing lifting provisions are difficult with printed concrete. It is also difficult to add extra reinforcement to the walls at the location of the lifting provisions, especially with a wall thickness of only 50 mm. For the last flower containers, a separate lifting provision was chosen, which was installed after the printing process.