本文所介绍的意大利墨西拿海峡桥渡结构,是一种新颖的桥梁方案。它是将钢和混凝土组合构成的管体悬浮在水下并在管内设置公路、铁路车行道的水中桥梁。据论证,这种桥梁方案可适于跨越宽度大于1800m且水深大于60m的海峡、湖泊或河道。这种桥型的设计出发点比之以往通常的设计思想有根本的不同,即把水当作桥渡障碍物的设计思想改变为利用水来支承桥渡结构物。文中对这种新型的水中桥梁的设计原理、施工原则、适用范围等作了简要述阐。 This article describes the Italian Messina Strait bridge structure, is a novel bridge program. It is a combination of steel and concrete pipe body suspended in water and set in the tube road, rail road water bridge. It is argued that such a bridge solution may be suitable for crossing straits, lakes or rivers with widths greater than 1800 m and water depths greater than 60 m. The bridge design starting point than the usual design ideas are fundamentally different from the water as a bridge crossing the obstacle to the idea of ​​using water to support the bridge structure. In this paper, the design principles, construction principles, application scope and so on of this new type of underwater bridge are briefly described.