The concrete vacuum tube structure, which must maintain air-tightness, is manufactured in the form of a segment, and it is necessary to install the joints at uniform gap in order to assemble in the field. In this study, member tests were carried out to investigate the air-tightness performance at the joints of the concrete vacuum tube structures.

In water treatment facilities, cover having a various joint is applied to prevent the bad smell. In this study, each joint type of the aluminum cover that is applied to the sewage treatment facility, it was evaluated air tightness. As a result, it showed to be higher flat type better than stick out type.