近年来,不独在国外,而且也在国内,公路和城市桥梁设计和施工技术均有很大的发展。大跨度预应力混凝土桥梁采用分段悬臂浇筑和预制节段拼装的为数愈来愈多。因为这类施工方法有其独特的优点,可省去大量支架,避免深水施工,经济效果十分显著。配合悬臂施工法出现的预应力混凝土桥,早期大都是采用在跨中设铰的T型刚构,随后人们发现它存在不少缺点。由于高速公路的迅速发展,对行车要求也愈来愈高,所以少设缝的连续梁和其它超静定结构的采用也日益增多。本文拟从桥梁设计和施工的角度谈谈预应力混凝土梁桥体系从跨中设铰向连续结构演变的过程。 In recent years, not only in foreign countries, but also in the country, highway and city bridge design and construction technology has great development. Large span prestressed concrete bridges using segmented cantilever pouring and prefabricated segments assembled more and more number. Because of this construction method has its own unique advantages, can save a lot of scaffolding, to avoid deep water construction, the economic effect is very significant. With the cantilever construction method appears prestressed concrete bridge, mostly early use of the hinge in the span of the T-shaped rigid frame, then people find it has many shortcomings. Due to the rapid development of the expressway, the demand for traffic is also getting higher and higher. Therefore, the use of continuous beams and other statically indeterminate structures with fewer joints is also increasing. This paper intends to talk about the process of the prestressed concrete girder bridge system from the span of the bridge to the continuous structure of the hinge design from the perspective of bridge design and construction.