To take reaction in a part of dirt floor concrete, and to correct dirt floor concrete at a low cost when ground subsidence progresses in a reclaimed ground and uneven settlement occurs on a dirt floor concrete floor.
A part of dirt floor concrete 1a is cut and a cut-off reaction slab 1 is formed, a jack is installed onto the cut-off reaction slab, a frame 6, which is formed in a portal shape and in which base columns are fixed onto dirt floor concrete in the periphery of the cut-off reaction slab, is placed on the jack, and a plurality of holes for grouting mortar are bored around the cut-off reaction slab. An opening is formed between dirt floor concrete in the periphery of the cut-off reaction slab and a ground by lifting dirt floor concrete 1a in the periphery by required quantity through the frame 6 by the jack by taking reaction in the cut-off reaction slab 1, the opening is filled with mortar from the holes, mortar filled into the opening is cured, and a space on the cut-off reaction slab 1 is filled with mortar and mortar is cured, and a floor level is corrected at a horizontal level.
MIURA SHINYA
MORIKI SHIGEYUKI
HATANO YASUHIRO
NISHINO HARUMI
SANTO KK
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