Sack gabions are cylindrical baskets made from double twisted steel woven wire mesh with mechanical characteristics as per codal provisions. These elements are adopted for the protection of banks and embankments, for the construction of gravity support works, for retaining unstable slopes which have a "substantial structural importance."
The cylindrical gabions are filled with stones on site to create a flexible and permeable structure to be used for river bank protection works and emergency works. The cylindrical gabions are fitted with reinforcement bars inserted in the mesh during manufacture to facilitate the closing during installation. The wire used in the production of cylindrical Gabions may be coated with an additional coating of PVC material, in consideration of the service life of the works and the degree of environmental aggressiveness.
In order to strengthen the structure, all the edges are reinforced with a wire having a larger diameter than that used for the mesh. A combination of various types of mesh and wire diameters are available depending on the mechanical performance required and the various combinations of dimensions and measurements of the box or cylindrical Gabion elements.