| 摘要 |
PROBLEM TO BE SOLVED: To provide a bag body for civil engineering having a leak preventive function, by which there is no possibility that a fluid leaks from a filler hole even when the pressure of the fluid injected into the bag body is increased. SOLUTION: A flow passage 30 with a closing surface 31 faced to a filler bole 10 is formed into the bag body 1, the flow passage 30 is crushed by utilizing fluid pressure in the bag body by fluid injection, and the filler hole 10 is closed directly by the closing surface 31. Accordingly, even when fluid pressure in the bag body is increased, the filler hole 10 is not opened and the leakage of a content can be hindered accurately while structure is simplified extremely and the bag body can be provided at a low cost.
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