| 摘要 |
<p>A prefabricated stackable unit (4) for use in the erection of a temporary structure includes a stepped section which is movable between a plurality of positions and leads from a lower surface to an upper surface of the unit. At each corner of the unit (4) there is a quick release bolt which is retained in a recess in a plate. When two units are brought together the bolt can be inserted into a hole in a plate on the second unit and locked therein. A base unit (2) has a castor (48) carried on a spigot (58) disengaged position to a surface engaged position to hold the at each corner. A brake (16) is movable from a surface base unit in position on the surface. <IMAGE></p> |
