Site conservation techniques: shelters

Metal frames

NOTE: on this topic, cf. also the dedicated topical book on “CONSERVATION”.

Taken together, the metal frames constitute like a cage that is placed atop the wall remains.
Main characteristcs of the metal frames are:

Structural components. – The metal used is iron throughout, which is treated with anti-rust paint. There are two main components: L, T or square section bars (typically 4 cms. on the side), and tubular pipes (typically one inch in diameter).
Assembled elements. – The components are assembled into modules that consist essentially of grate-like panels for the top, and single pieces for the uprights.
Modularity. – The modules are linked with sockets and screws that allow for assembling and diassembling as needed.
Stability. – The weight of the assembled "cages," interlocked as they are with each other, is sufficient to hold them in place, without anchoring them to the ground.
Non-invasiveness. – As a result, the "cages" are totally non-invasive: they simply sit on the ground, and only in a few cases are the feet attached to stakes that are set in the ground (which is normally backfill above the floor surfaces).
Distance from wall tops. – The top of the extant walls are often quite uneven in their outline. This is regularized, in the cage, to a standard height for different segments of the walls, and in any case the "roof" of the cage is always at a considerable distance from the top of the wall.
Distance from wall faces. – The distance from the wall faces is uniform, about 10/15 cms. This increases slightly the perception of the volumes, but it prevents the panels from rubbing against the wall faces in case of strong winds.

The metal frame in place, showing the uprights holding the grate-like top at a uniform height above the top of the preserved wall.