SOIL DRAINAGE DEVICE AND CONSTRUCTION METHOD OF SOIL DRAINAGE DEVICE

To provide a soil drainage device that can efficiently drain interstitial water of soil to be treated with a simple configuration.SOLUTION: A soil drainage device 1 comprises a water collecting facility 2 for collecting interstitial water of soil to be treated, and a negative pressure acting facility 3 for applying a negative pressure to the soil to be treated via the water collecting facility 2. The water collecting facility 2 includes a plurality of water collecting layers 21 that are laid at intervals in the height direction in the soil to be treated that has been dropped on the ground. The negative pressure acting facility 3 includes a water storage tank 31 which is erected in the middle of the water collecting facility 2 and has a plurality of through holes 32 provided at height positions facing each of the plurality of water collecting layers 21, a drainage device 34 that drains the interstitial water that has flowed into the water storage tank 31, and a decompression device 33 that decompresses the inside of the water storage tank 31.SELECTED DRAWING: Figure 1 【課題】簡略な構成で効率よく、処理対象土の間隙水を排出することの可能な、土壌排水装置を提供する。【解決手段】処理対象土の間隙水を集水する集水設備２と、集水設備２を介して処理対象土に負圧を作用させる負圧作用設備３と、を備える土壌排水装置１であって、集水設備２は、地盤上に投下された処理対象土内で、高さ方向に間隔を設けて敷設される複数の集水層２１を備え、負圧作用設備３は、集水設備２の中ほどに立設され、複数の集水層２１各々と対向する高さ位置に設けられた複数の貫通孔３２を備える貯水槽３１と、貯水槽３１に流入した間隙水を排水する排水装置３４と、貯水槽３１内を減圧する減圧装置３３と、を備える。【選択図】図１