Non-metallic support structures and load bearing structures, namely, non-metallic support structures and load bearing structures in the nature of stackable and interlocking plastic blocks used to support and hold immobile buildings, stackable and interlocking plastic blocks used to hold building materials mobile, stackable and interlocking plastic blocks used to prevent movement of soils, stackable and interlocking plastic blocks used to prevent mine collapses in mining operations, stackable and interlocking plastic blocks used to hold construction equipment immobile, stackable and interlocking plastic blocks used to hold machinery immobile, and stackable and interlocking plastic blocks used to hold plant equipment immobile; non-metallic support structures for building including temporary non-metallic support structures in the nature of cribbing blocks, stackable and interlocking plastic blocks used for scaffolding purposes; non-metallic struts including plastic struts in the nature of stackable and interlocking plastic blocks; non-metallic support blocks used in construction; plastic blocks and plastic articles, namely, moulded plastic blocks and moulded plastic articles for civil engineering purposes; interlocking blocks of plastic designed to create temporary non-metallic support structures of variable size and configuration; functional interlocking and stackable mouldings made from polyurethane for use in building construction, building repairs, and building relocation; movable partitions of plastic for building, retaining walls; plastic posts