PROBLEM TO BE SOLVED: To provide a culvert formation device that suppresses clogging of openings of a penetration mark groove and a vertical port passage by soil of a farm field and maintains excellent draining property and air-permeability of the farm field, by having the penetration mark groove and the vertical port passage open in a digging groove formed at a position where the vertical port passage is formed as a lower part of a plow member scoops the soil of the farm field and discharges the soil sideways as a machine body travels, and by causing water on a surface of the farm field reach a culvert from the openings of the penetration mark groove and the vertical port passage through the digging groove, thereby reducing a distance from the farm field surface to the culvert.SOLUTION: A culvert formation device has a plow member 27 provided on a machine frame 3, the plow member being capable of scooping soil of a farm field and discharging the soil sideways, thereby forming a digging groove U at a position D where a vertical port passage is formed.SELECTED DRAWING: Figure 2COPYRIGHT: (C)2016,JPO&INPIT【課題】走行機体の進行に伴いすき部材の下部は圃場の土を掬い取って側方に排出して縦口路形成位置に掘取溝を形成することになり、穿入跡溝及び縦口路が掘取溝内に開口することにより穿入跡溝及び縦口路の開口が圃場表面の泥土により閉塞されることを抑制することができ、圃場表面の水は掘取溝を介して穿入跡溝及び縦口路の開口から暗渠に至ることになり、圃場の地表面から暗渠までの距離も短くなり、それだけ、圃場の排水性及び通気性を良好に保持することができる。【解決手段】機枠3に圃場の土を掬い取って側方に排出して縦口路形成位置Dに掘取溝Uを形成可能なすき部材27を設けてなる。【選択図】図2
