DOOR LEAF Russian patent published in 1996 - IPC

FIELD: construction of special-purpose protective structures; applicable in erection of ground surface and buried into ground protective structures of various objects, especially, of those with hazardous production processes. SUBSTANCE: door leaf has internal and external layers of horizontal pipes round or square in cross-section with sealing interlayer located between them and layer of sealing rubber over the contour of contact of door leaf with framework of opening. Pipe hollows are filled with material featuring effective protective properties from the effect of ionizing radiations and high temperatures, for instance, ground in polyethylene bag. Pipes of the extreme layer are displaced so as to overlap the horizontal joints of the internal layer pipes and fastened on edges with two adjacent pipes of the internal layer, and also pipes of the internal layer are connected by means of bolted joints. EFFECT: the offered door leaf provides for higher protective properties with respect to ionizing radiation and high temperatures and is easy to assemble, disassemble and to be transported. 4 dwg