WATER PASSING METHOD IN CONTINUOUS UNDERGROUND WALL

PURPOSE:To secure the water cut-off property at the time of construction of an underground building and the water passing property at the time of completion thereof easily. CONSTITUTION:Porous pipes 6 respectively having water passing holes 4 are arranged in the continuous underground wall 2 in the vertical direction, and the impermeable expansion material 8 is inserted into the porous pipe 6 to form the double-pipe structure. At the time of execution of an underground building, the water cutoff property is thereby secured, and at the time of completion, the impermeable expansion material 8 is eliminated and the rough grain material (crushed stone 36 or the like), is thrown into the porous pipe 6 to secure the water passing property. In place of the porous pipe 6, a square-shape water passing frame, to which a steel mesh is fitted at the ground side opening, is arranged in the vertical direction, or separate water passing parts can be distributed for arrangement in the wall thickness direction. Consequently, the water cut-off property at the time of construction and the water passing property at the time of completion can be secured by the simple work with the simple material to obtain the land slide protecting method, which prevent a change of ground water system for a long term.