| 摘要 |
A door device (1) for a tank (2), provided with at least one loading and unloading aperture, the door (4) having a generally arched form substantially fitting the curve of the wall of the tank (2), characterized in that said door (4) substantially consists of a structural casing (5) in the form of a metal plate provided with folded lateral edges (5') and of a filling body (6), also in the form of a plate, mounted in the casing (5), said body (6) being held in said casing (5) by the folded edges (5') thereof, due to the arching experienced by the casing body assembly and the resultant arched overlapping arrangement.
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