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先简支后连续梁桥结构刚度大,钢材和混凝土用量相对较少;由于主体机构采用预制构件,因此施工简便且砼的收缩和徐变对梁的挠度和次内力影响较小;同时大大减少了伸缩缝的数量,增强了结构的整体性和行车舒适性,并改善外观质量。目前,先简支后连续的结构得到了广泛的应用,且取得了良好的经济效益和社会效益。本文通过工程实例,主要介绍了先简支后连续桥梁结构施工工艺特点及其施工质量控制方法。
Since the main body adopts the prefabricated structure, the construction is simple and the shrinkage and creep of the concrete have less influence on the deflection and secondary internal force of the beam; at the same time, the structure of the first simple supported continuous beam bridge is large in rigidity and less in the amount of steel and concrete; The number of expansion joints to enhance the structural integrity and driving comfort, and improve the appearance of quality. At present, the first simple structure after the continuous has been widely used, and achieved good economic and social benefits. In this paper, through the engineering examples, the paper mainly introduces the construction process characteristics and construction quality control methods of the first simply supported continuous bridge.