(57) A barrier structure particularly for use in protective doors designed to resist explosive
charges applied to their outer surfaces, comprises a multiplicity of water-filled
containers 7 located behind the outer door plate 1. The purpose of the water is to
absorb the shock and thermal energy of an explosion occurring at or near the outer
plate 1 and thus shield the rearward portions 2,4 of the structure from the damaging
effects of the blast. For thief-resisting applications (Figs 3 and 4, not shown) the
structure also comprises various layers of different materials selected for resistance
to other, non-explosive burglary tools, disposed rearwardly of the explosion-resistant
water layer.
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