| 摘要 |
PROBLEM TO BE SOLVED: To provide a drainage structure having a drain passage formed in an upper plane of a folded-plate roof constituted of a rainwater receiving plate and a rainwater guide plate, which is arranged so as to efficiently drain rain water without getting a damage on the rainwater receiving plate even when being hit by a large amount rain or a snow block sliding down on the upper plane of the roof.SOLUTION: A folded-plate roof 1 includes: a rainwater receiving plate 3 having a generally L-like cross section attached to the upper plane thereon, a water catchment 11 connected to the one end of the rainwater receiving plate 3; and a rainwater guide plate 4 of a folded-plate member, which is attached to the folded-plate roof 1 being positioned thereon closer to the ridge side than the fitting position of the rainwater receiving plate 3. The rainwater guide plate 4 is attached including a space S between the end part 4a which is connected to the folded-plate roof 1 and the roof upper plane 1a and is arranged so that, when a rainfall is large, overflow from the space S gets on the rainwater guide plate 4 and flows on the upper plane of the rainwater receiving plate 3 to be discharged in to water catchment 11. |
