LOCK REINFORCEMENT MEMBER, LOCK DEVICE, DOOR BODY AND OPENING SECTION DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a lock reinforcement member capable of reliably and stably preventing not only communication of indoor and outdoor sides with each other but also outflow of combustible gas generated within a door (door body).SOLUTION: A lock reinforcement member 41 for holding a lock box in a door body includes: a pair of plate members 42a and 42b which are two steel plates having one-side surfaces provided so as to face each other and in which through-holes are formed; a heating expansion body 44 that is provided in each of the opposed surfaces of the pair of plate members; and an incombustible heat-insulation sheet 43 that is provided on the surface on the other side of the surface, on which the heating expansion body is arranged, of each of the pair of plate members.