跨越河宽水深的大跨度桥梁,如在桥孔间需保持通航要求,或建筑施工支架困难的情况下,使用悬臂施工方法,可以节约大量脚手架、模板及劳动力,并缩短建桥期限。悬臂施工是从墩台的顶上将梁式上部构造分段的向一边或两边浇筑出去,或是用预制的块件, If long-span bridges across the river are required, such as the need to maintain navigational requirements between bridge openings or difficulties in construction support, the use of cantilever construction methods can save a great deal of scaffolding, formwork and labor and shorten the construction period. Cantilever construction is from the top of the piers will be beam structure of the upper part of the construction of one or both sides of the pouring out, or with prefabricated pieces,