The invention relates to the technical field of ship construction, and discloses a marine manhole sealing device which comprises a pressing plate, a holding column, a sealing piece, an abutting piece and a locking ring buckle, the pressing plate and the abutting piece are arranged on the two sides of a cabin plate at a manhole respectively, the edge of the pressing plate protrudes out of the edge of the manhole, and at least two ends of the abutting piece protrude out of the edge of the manhole. The sealing part is arranged between the pressing plate and the manhole, the holding column is connected with the pressing plate and protrudes out of the side, away from the manhole, of the abutting part, the abutting part is provided with a clamping groove used for being matched with the holding column, and the peripheral wall of the holding column is provided with a first sliding groove extending in the axial direction of the holding column and a second sliding groove extending in the circumferential direction of the holding column. The second sliding groove is connected with the end, facing the abutting piece, of the first sliding groove, the locking ring buckle comprises a ring body arranged on the holding column in a sleeving mode and a limiting protrusion connected to the inner side of the ring body, the limiting protrusion can slide along the first sliding groove and the second sliding groove, and when the limiting protrusion is located in the second sliding groove, the ring body abuts against the abutting piece, and the abutting piece abuts against the cabin plate. Installation can be completed by one person, and the installation efficiency can be improved.

本发明涉及船舶建造技术领域，公开了一种船用人孔密封装置，包括压板、握柱、密封件、抵压件和锁位环扣，压板与抵压件分别设于人孔处舱板两侧，压板边缘向外凸出于人孔边缘，抵压件的至少两端凸出于人孔边缘，密封件设于压板与人孔之间，握柱连接压板并凸出于抵压件背离人孔的一侧，抵压件设有用于与握柱配合的卡位槽，握柱的外周壁开设有沿握柱轴向延伸的第一滑槽和沿握柱周向延伸的第二滑槽，第二滑槽连接第一滑槽朝向抵压件的一端，锁位环扣包括套设于握柱的环体和连接于环体内侧的限位凸起，限位凸起能够沿第一滑槽、第二滑槽滑动，当限位凸起处于第二滑槽，环体抵顶抵压件，抵压件抵压舱板。本装置一人即可完成安装，能提高安装效率。