SIDE DITCH DRAINAGE DEVICE

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 【課題】雨水等の排水と共に路面を移動する異物を排水と同時に排出でき、雨水、砂、異物等が混在する排水を高効率で行い、かつ、小型化したこと。【解決手段】道路側溝または橋梁の側溝の排水管路に接続され、排水吸込口Ａよりも排水排出口Ｂの排水流に対する垂直断面の開口面積の内径を狭く形成した本体１０と、本体１０の排水吸込口Ａの上面を被うグレーチング蓋１３とを具備し、本体１０は、排水排出口Ｂの直径Ｄに対して楕円の長径を２Ｄとし、短径を４Ｄ／３の楕円方程式の曲線に沿って排水吸込口を７Ｄ／３の直径とし、排水吸込口Ａの上面を被うグレーチング蓋１３を通過し、排水吸込口Ａから排水排出口Ｂに連続的に排水を流すものである。【選択図】図９