Topic The temporary cofferdam manner and the like which can do the temporary cofferdam for the waters easily is offered. SolutionsIt is constituted and by side wall section 2 and cartridge head 4 from a state to which the composition plane has been opened, floats in the water surface the temporary cofferdam structure 1 inside floating body section 100 and 400, inflow section 200, block into pouring water section 300 at least, with side wall section 2 as a cross direction, it pours water to pouring water section 300, it sinks to underwater from cartridge head 4 by inflow the water into inflow section 200, it puts in a state where it floats in the water surface with side wall section 2 as a lengthwise. In order and, temporary cofferdam structure 1, the side wall section for the end face of 2 which is formed to the composition plane to edge strip 3of a dam levee body 3, and cartridge head 4 to parallel, it lays out. After that, temporary cofferdam structure guttation the space where is surrounded with edge strip 3of a 1 and dam levee body 3. Choice figure Drawing 8
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