Modular structure for providing on-site protection

A modular assembly for at least partially enclosing a site during construction of a structure, the modular assembly comprising:

• a plurality of portal frames, each portal frame comprising two columns and a roof beam, each column and roof beam comprising a plurality of pre-assembled units;
• a jack-up frame for each column;
• at least two first rails, each of the first rails being mounted to at least one of the roof beams;
• at least one second rail slidably mounted to the at least two first rails;
• and
• a plurality of panels of a flexible material configured to provide a full enclosure of the site and mounted above the roof beam;
• wherein, the or each second rail is configured to slidably receive at least one lifting device;
• wherein, the pre-assembled units are configured to be connected on site, and lifted using said jack-up frames, to form the portal frames, and wherein each first rail, and the or each second rail are configured to be mounted on the portal frames on site;
• the modular assembly further comprising at least one edge rail system mounted adjacent an edge of the assembly, the or each edge rail system comprising:
• at least two third rails each of the third rails being mounted to at least one of the roof beams;
• at least one fourth rail slidably mounted to the at least two third rails to form an edge rail system and configured to slidably receive at least one lifting device,
• wherein said at least one fourth rail is configured to be alignable with said at least one second rail to enable transfer of a lifting device between the at least one second rail and the at least one fourth rail.