PERIMETER SCREENING SYSTEM
The invention provides a perimeter screening system for a multi-level building, that includes a screen assembly (32) including at least one perimeter screen (16), and lifting means (36) connected to the assembly and fitted with a first support member (44) detachably connectable to a floor of the building to provide a bearing point for lifting the screen assembly to another floor. A pair of second support members (38,39) is laterally spaced from the first support member and the second support members are detachably connectable to a floor for receiving the load of the screen assembly whilst the screen assembly is in a stationary position. At least one vertical guide column (50) is connected to the screen assembly and has a plurality of vertically spaced apart horizontal elements (54). Safety means (56) is fitted to at least one of the second support members and interacts with the at least one vertical guide column so as to allow the screen assembly and guide column to be lifted past but to receive the load of the screen assembly by engaging under one of the horizontal elements in the event of failure of the lifting means during lifting of the screen assembly. At least another of the second support members is retractable towards the screen assembly to travel with the screen assembly past a next floor during lifting of the screen assembly, and the first support member is retractable towards the lifting means to travel with the lifting means past a next floor as it is retracted upwardly.