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大跃进中,我局开始采用框架式钢筋混凝土桥梁,定名为箱形桥,10多年来施工、运营实践证明,我局地处江南河网地区,箱形桥这科结构形式不仅具有结构高度较小,既便利通航,又节约用地,而且能适应软土地基一般情况下不需处理,在既有桥邻侧增建桥梁线间距为5米及以上时一般不需防护,运营中没有病害,养护工作量极少等优点。近年来随工农业飞跃发展,铁路公路立交桥大量增建,在运营条件下施工,一般都采用顶进法,其桥跨结构也是框架式。
During the Great Leap Forward, our bureau began to adopt a frame-reinforced concrete bridge and named it a box-shaped bridge. During more than 10 years of construction, our practice proved that our bureau is located in the area of Jiangnan River. The structural form of the box-shaped bridge not only has structural height Small, both facilitate navigation, but also save land, but also to adapt to the soft soil foundation under normal circumstances do not need to deal with, in the existing bridge adjacent to the construction of the bridge line spacing of 5 meters and above generally do not need protection, operation without disease, Little maintenance and other advantages. In recent years, with the rapid development of agriculture and industry, a large number of railroad overpass construction, construction conditions in the operation, generally using the jacking method, the bridge structure is also a framework.