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预应力混凝土连续梁桥是预应力桥梁中的一种，它具有整体性能好、结构刚度大、变形小、抗震性能好、特别是主梁变形挠曲线平缓，桥面伸缩缝少，行车舒适等优点。
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桥梁工程始终是在生产发展与各类科学技术进步的综合影响下，遵循适用、安全、经济与美观的原则，不断的向前发展。
预应力混凝土连续梁桥以结构受力性能好、变形小、伸缩缝少、行车平顺舒适、造型简洁美观、养护工程量小、抗震能力强等而成为最富有竞争力的主要桥型之一。不仅在桥梁工程中得到广泛的应用，而且在桥梁工程专业课程教学中也作为应重点掌握的基本桥型。随着预应力技术的发展和不断完善，尤其是悬臂、顶推等先进施工方法的出现，更使预应力混凝土连续梁桥如虎添翼而活跃在整个桥梁工程领域，无论是城市桥梁、高架道路、山区高架栈桥，还是跨越江河湖滨的大桥，预应力混凝土连续梁桥都以它独特的魅力，而取代其他桥型为优胜方案。另外，从国内外已建成的刚巧、钢筋混凝土以及预应力混凝土连续梁桥的修建总数来看，预应力混凝土连续桥已远远超过半数，充分表现出预应力混凝土连续梁桥的强大生命力。
综上所述，预应力混凝土桥梁所以在近30年来具有强大的竞争能力，主要的因素有：
1.预应力混凝土充分发挥高桥材料的特性，具有可靠地强度、刚度以及抗裂性能。结构在车辆运营中噪音小，文修工作量小。
2.预应力混凝土桥梁的施工方法已达到相当先进的水平，现代化技术的应用已使它的施工周期大大缩短，显示出巨大经济效益。
3.预应力混凝土桥梁适用于各种结构体系，而且还在不断创造出体现预应力技术特点的新型结构体系，因而它的适用范围大，竞争力强。
4.预应力混凝土桥梁可充分利用材料可塑性的特点，在建筑上有丰富多彩的表现潜力，更易达到与周围环境相协调的简洁而美观的形式，实现经济性和美观的统一。
此桥采取主孔跨径120m的三跨变截面连续梁桥，对于箱形截面梁，边跨与中间跨的跨径比值为(0.5~0.7):1,结合悬臂施工的要求,取边跨跨径65.5m。上部结构采取箱形截面，前面已经确定边跨与中跨的跨径，则对于两幅独立的桥跨结构，每单幅桥采用单箱单室的箱形截面梁。对于曲线形变高度连续梁桥，支点梁高取用H=7.5m，中跨的跨中梁高取用h=3m，梁底曲线:从与截面内力的配合和美观方面来看，选用二次抛物线梁底曲线。桥面铺装：选用70mm厚的钢筋混凝土作为铺装层，1mm防水层，上加90mm的沥青混凝土磨耗层，共计161mm厚。主桥主墩基础采用24根φ=1000的钻孔灌注桩；承台厚度取2m，主桥桥墩采用双柱式墩身。
全桥被对称的划分为80个单元，利用电算程序计算恒活载以及各施工阶段内力。然后对内力进行组合，计算后对全桥进行预应力束的配置，经验算可以满足规范要求。
施工方法采用满堂支架。7266
【关键词】连续梁桥；箱型截面；满堂支架施工；预应力。
The continuous girder bridge design of S6 jiading expressway
Prestressed concrete continuous girder bridge is one of the prestressed concrete Bridges.It has a good overall performance, big stiffness, small deformation, seismic performance is good. Especially the deformation of main girder flexural gentle, bridge expansion joints, driving comfort, etc. Bridge engineering is always in development and production under the comprehensive influence of all kinds of scientific and technological progress, adhere to applicable, safe, economic and aesthetic principle, developing forward continuously. Prestressed concrete continuous girder bridge structure stress performance good, small deformation, less expansion joints, driving smooth and comfortable, beautiful modelling concise, maintenance quantity is small, earthquake resistant capability is strong, etc and become the most competitive one of the main bridge.Not only widely used in bridge engineering, but also in the bridge engineering course teaching should focus on the mastery of the basic bridge.With the development of the prestressed technology and continuous improvement, especially the cantilever, pushing the emergence of advanced construction methods, such as more icing on the prestressed concrete continuous girder bridge and active in the field of the whole bridge project, whether urban viaduct pier Bridges, elevated road, mountainous areas, or across rivers and lake bridge, prestressed concrete continuous girder bridge with its unique glamour, and replace the other bridge for better solution.From discrimination has been built at home and abroad, in addition, the total number of reinforced concrete and prestressed concrete continuous girder bridge construction, prestressed concrete continuous bridge has far more than half, fully showing the strong vitality of the prestressed concrete continuous girder bridge.
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