Self supporting riddle - for gravel, earth etc

摘要

Self supporting, modular design, riddle for gravel earth etc., whose two orthogonal sets of parallel bars forming the mesh are of esp., injection moulded material on a planar reinforcing mesh assembled from one set of flat metal or reinforced plastic bars and one set of square section tubes of similar material with filler pieces of the same material or of wood, the whole being assembled with screws or bolts and the filler sections, being used for spigot jointing the modular sections. Cheap, reliable and easy to maintain.