| 摘要 |
PROBLEM TO BE SOLVED: To provide a side ditch drainage device that enables drainage such as rain water and foreign matter moving on a road surface to be discharged with the drainage, and thereby performs the drainage mixed with the rain water, sand and foreign matter with high efficiency, and further is miniaturized.SOLUTION: A side ditch drainage device comprises: a body 10 connected to a drainage line of a road side ditch or the side ditch of a bridge, and having an inner diameter of an opening area of a vertical section to a drainage flow of a drainage outlet B formed narrowly more than a drainage suction port A; and a grating lid 13 for covering the upper surface of the drainage suction port A of the body 10. The body 10 assumes the drainage suction port with the diameter of 7D/3 along the curve of the ellipse equation where a major axis of an ellipse is 2D to the diameter D of the drainage outlet B and a minor axis is 4D/3, and thereby the drainage is made to pass the grating lid 13 covering the upper surface of the drainage suction port A and the drainage is continuously made to flow from the drainage suction port A into the drainage outlet B.SELECTED DRAWING: Figure 9 |
