| 摘要 |
FIELD: civil engineering. SUBSTANCE: door consists of two door folds connected to door casing. The door is hinged to door frame installed in wall aperture to provide absolutely rigid fastening in the aperture. The door is installed in door frame using lower and coaxial upper hinge supports placed respectively on power and upper door faces and being flush-mounted. Door frame on the side of supports is shaped in such a way that it overlaps gaps when closing and is a stop to rotate in opening, as well as blind locking profile to prevent break open. Such structural decision allows to increase ability to prevent breaking open at the expense of excluding possibility to break load bearing door hinges in unauthorized access, as well as to increase workability of the structure under extreme conditions. EFFECT: high reliability. |
