| 摘要 |
PROBLEM TO BE SOLVED: To provide a construction method of a cut-off wall capable of surely cutting off a horizontal current of ground water by preventing a crack or a gap occurring in the cut-off wall. SOLUTION: A pair of columnar in-site mixing walls 21 are constructed in the ground 12 in parallel, earth and sand between a pair of in-site mixing walls 21 are removed to form a gap 24, a grout becoming a soil material 26 having flexible expansion efficiency when it is solidified is poured into the gap 24 to enable a wall having flexible expansion efficiency to form between the in-site mixing walls, so that the crack or the gap can be prevented from occurring in the wall in case of earthquake.
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