| 摘要 |
FIELD: building, particularly fire doors. ^ SUBSTANCE: door leaf comprises metal frame composed of longitudinal and transversal rods welded one to another and made of tubes having rectangular cross-sections. Connected to the frame are metal covering panels. Fire-resistant filler is located between the panels. The rods are provided with plugs made of Wood's alloy and are filled with water to moisture the fire-resistant filler in fire. ^ EFFECT: increased fire resistance. ^ 2 dwg |
