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。
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
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