ENCLOSURE Russian patent published in 2008 - IPC E04H17/00 

FIELD: construction.

SUBSTANCE: invention refers to the sphere of construction and may be of use for preventing unauthorised access to classified installations such as: nuclear hazardous objects defense facilities, top secrecy industrial facilities, air ports. The enclosure consists of support poles, an undermining prevention element, netting and a cylinder-shaped spiral. The netting and the spiral are made of barbed wire fabricated of, for example, plated high-carbon steel wire with plated steel strap affixed onto it (by means of pressurisation) that has sharp diametrical spikes. There are additional cylinder-shaped spirals introduced attached at the top and at the bottom to equally additionally introduced wires stretched between the poles. The undermining prevention element consists of an angle bar or a metal strap with spikes welded onto it which is rigidly fixed between neighbouring poles, with the netting attached to the lower wire at the top and to the undermining prevention element at the bottom.

EFFECT: structure simplification; minimisation of labour and metal material expenditures and related costs.

4 cl, 1 dwg