| 摘要 |
A sealing rib is disposed within a pipeline, such that an interior of the pipeline is divided uniformly into plural flow paths along a peripheral direction. A flexible-film body to whose interior a fluid for inflation can be supplied, is disposed in each divisional flow path. Each of the plural flexible-film bodies within the pipeline is inflated by the fluid so as to block-up the pipeline. Therefore, a height of the flexible-film body which is in an inflated state can be made to be low. Further, because little tension is applied to the flexible-film body, it suffices for a durable strength required of the flexible-film body to be small. In accordance with this structure, it is possible to obtain a flexible-film expandable gate which does not use a highly-rigid film body, and which can reliably exhibit a water stopping ability even in a pipeline of a large diameter.
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