Device for preventing the entry of water into a work site located adjacent to an extent of water and below the level of water.

摘要

A ship building dock has an opening defined by a threshold and two side posts, which is closed by a door structure including a vertical waist portion forming the closure proper and a lower balancing portion, which may be vertical or horizontal. The structure is designed in such a manner that the external water pressure upon the two portions will about balance each other, and the forces of reaction will appear about at the level of the threshold.