It is the most need to consider resource conservation and environmental protection of the bridge for cross sea bridge. And long-span rail-road cable-stayed bridge is preferred type of bridge design in the world occupy the bridge across the sea channel resources in the most economical, but also cross-sea bridge design. Based on cross sea bridge and the collection of documents and materials in a wide range of research, to our country in recent years to build a cross sea bridge were combing statistics, found that it has been the construction of the highway cross sea bridge most of the main shipping channel bridge is a cable-stayed bridge in China. On the part of the domestic and foreign long-span rail-road dual-purpose cable-stayed bridge structure design of key technologies are discussed in this paper. Combined with the characteristics of large span highway and railway dual-purpose cable-stayed bridge structure, to apply to large span highway and railway dual-purpose bridge cable-stayed bridge structure system and the bridge deck layout were compared and analyzed. The influence of rail-road amphibious inclined pull bridge span increasing problems and countermeasures; also for cross sea passage highway and railway dual-purpose cable-stayed bridge design life of more than 100 years, at the request of the cross sea bridge design safe and reliable economic and beautiful at the same time, but also in the operational phase get proper maintenance, in order to achieve the goal of durability and sustainable development. So the durability of the steel beam and the steel cable of long span and double purpose cable stayed bridge are analyzed and studied. The research results can provide technical reference for the design of the same type of cross sea bridge.
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