PROBLEM TO BE SOLVED: To provide a construction method of a ridge waterproof wall and a construction device of the ridge waterproof wall in which the ridge waterproof wall of any size can be formed while maintaining a shape of a ridge, and thereby a water leak of a paddy field is prevented easily and reliably.SOLUTION: An excavation plate 32 is arranged with a standing-shaped body to the ground and is driven with breaker attachment 30 of a backhoe 28, and a groove 26 is formed to a raised trace by raising the excavation plate 32. A leakage prevention material 11 is charged in the groove 26. The leakage prevention material 11 contains bentonite 13. A container 44 where the leakage prevention material 11 is put in the backhoe 28 is installed, the container 44 is held in the upper part of the groove 26 by operating the backhoe 28, and the leakage prevention material 11 is made to fall from an outlet 46 provided at the container 44 and charged in the groove 26.SELECTED DRAWING: Figure 2【課題】畦畔の形状を維持したまま任意の大きさの畦防水壁を形成することができ、簡単で確実に水田の水漏れを防ぐ畦防水壁の施工方法と畦防水壁の施工装置を提供する。【解決手段】地面に対して掘削プレート３２を起立状体で配置し、バックホウ２８のブレーカアタッチメント３０で打ち込み、掘削プレート３２を引き上げることにより、引き上げた跡に溝２６を形成する。溝２６の中に、漏水防止材料１１を投入する。漏水防止材料１１はベントナイト１３を含む。バックホウ２８に漏水防止材料１１を入れた容器４４を取り付け、バックホウ２８を操作して、溝２６の上方に容器４４を保持し、容器４４に設けられた取出口４６から漏水防止材料１１を落下させ溝２６に投入する。【選択図】図２
