| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to suppress overflow from a drain pipe cover regardless of a shape of a bent pipe, at the time of concentrated torrential rainfall.SOLUTION: There is provides a rainwater drainage system comprising: an eaves gutter 2 attached to eaves of a roof; a downpipe 3 provided at part of the eaves gutter 2; a horizontal pipe 6 that is connected to the downpipe 3 via an elbow 4, is embedded underground, and is joined by an indoor drain pipe 5; and a basin 7 including a gully 72 provided on the horizontal pipe 6 and a confluence basin 71 connected to the indoor drain pipe 5. Rainwater flows into the eaves gutter 2, passes through the downpipe 3, and is made to flow out to the horizontal pipe 6. Siphon generation parts are provided in the eaves gutter 2 and downpipe 3, and a straightening rib is provided in a passage that is between the downpipe 3 and horizontal pipe 6 and has the elbow 4.SELECTED DRAWING: Figure 2 |
