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支架与挂篮组合施工法是一种新型的施工方法,国外内采用此施工方法的桥梁均很少,此法施工情况比较复杂,其模型中涉及的参数较多,施工中存在许多误差,这些误差均将不同程度地对桥梁控制目标的实现产生干扰,且其线形在不平衡荷载作用下,支架、边跨梁体与中跨悬臂端变形相互影响,只有针对支架与挂篮组合施工法的特点,对其各施工工况的变形进行监测与控制,才能保证结构变形处于安全的范围内,并设置合理的成桥预拱度,使成桥后线形符合设计及长期使用要求。
The construction method of the bracket and the hanging basket combination method is a new type of construction method. There are few bridges abroad adopting the construction method, and the construction method of the method is complicated. There are many parameters involved in the model, and there are many errors in the construction. The errors will all interfere with the realization of the bridge control objectives to different extents, and the linear shape affects the deformation of the cantilever ends of the supports and the side spans under unbalanced load. Only by the combination of the support and the hanging basket construction method Characteristics, the deformation of the various construction conditions to monitor and control in order to ensure structural deformation in the safe range, and set a reasonable pre-camber into the bridge, so that after the bridge line design and long-term use meet the requirements.