PROBLEM TO BE SOLVED: To compact a CSG after compaction (compacting) when it takes a long time from adding and mixing cement and water to excavated soil material (locally generated material) to compaction (compacting). It suppresses the decrease in degree and suppresses the decrease in the strength of the structure. CSG includes unwashed excavated soil material, cement, water, and a coagulation retarder having the effect of delaying the coagulation reaction of cement. In the CSG method, the structure 101 is constructed by stacking CSGs in layers by repeating the steps of leveling and rolling the CSGs. [Selection diagram] Fig. 1
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