PURPOSE:To facilitate the construction of a rubber dam by a method wherein standardized dimensions are used for those of a rubber dam and also a standardized product fixed beforehand to a pedestal is used for a bag body as the main body in the rubber dam formed by injecting gas of liquid therein. CONSTITUTION:A standardized rubber product prepared by fixing beforehand a bag body 1 molded with a rubber or soft-plastic sheet to a pedestal 2 made of plastic or metal is placed on a base concrete 8 and fixed by an anchor bolt 9. In the base concrete 8 are provided a supply-discharge pipe 5 and an operation chamber 4, etc., thereby the operation for injecting gas or liquid in the bag body or exhausting the same from the bag body being carried out.
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