The belt is a material that is very eagerly used by children to play. It is a material that slides easily, therefore it requires various methods to keep it in one place. The simplest sandboxes are made as flat boxes or small depressions in the ground with edges reinforced with slabs, curbs etc.. Sand tables can perform a similar task as sandstones,, as used in playgrounds in Switzerland. There are many different types of sandboxes in our green spaces and children's playgrounds, which are made of various materials and have a different height in relation to the surrounding surface.
Sandboxes with walls protruding significantly above, the surrounding surface have this disadvantage, that getting in and out of them is quite difficult for young children. Coming out is all the more difficult, the less sand there is in the sandbox.
The material most often used to build sandbox walls is concrete, which can be laid on site in suitable formwork or from which various prefabricated elements can be made. Due to its natural sharpness, the concrete surface should be specially treated or refined on the outside. Concrete walls can, for example, be covered with natural stone slabs or similar materials to create a smooth and aesthetic surface.