VACUUM CONSOLIDATION METHOD COMBINED WITH BANKING

摘要

PROBLEM TO BE SOLVED: To provide a vacuum consolidation method combined with banking for improving a soft ground that allows a cap-type vacuum consolidation method to be applied efficiently, even to a soft ground for which an impermeable layer cannot be secured in a ground surface layer, when vacuum consolidation and banking are used in combination.SOLUTION: A vacuum consolidation method combined with banking for improving a soft ground uses a drain material 12 having an impermeable cap part 12a formed at a top part, a flexible drain hose 12b that extends from a top edge of the cap part, and a drain part 12c extending downward from the cap part, and comprises the following steps of: installing a plurality of the drain materials in a longitudinal direction in a ground G to be improved, keeping the cap part above a ground surface S; connecting the drain hose to a plurality of water collecting pipes 13 installed on the ground surface; air-tightly covering the entire ground to be improved with a double-face protection air-tight sheet 11 having both surfaces protected; applying a negative pressure on the drain material from a negative pressure source P, through the water collecting pipe; and placing a banking 15 on the double-face protection air-tight sheet.