| 摘要 |
PROBLEM TO BE SOLVED: To provide a door capable of reducing the manufacturing cost of the door while improving fireproof performance of the door by arranging to join the front side surface material and the rear side surface material as decorative steel plates to each other by means of welding.SOLUTION: A door 50 is a door for opening and closing an opening 2 of a building. The door 50 includes: an inner member which is disposed inside; a front side decorative steel plate which covers the inner member; and a rear side decorative steel plate which covers the inner member at the rear side. In the front side decorative steel plate and the rear side decorative steel plate, an edge face or rear face thereof is joined to a fixed member, which is fixed to the rear face thereof or the rear face of the other one, are joined alternately by means of welding.SELECTED DRAWING: Figure 1 |
