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为使读者对武汉市江汉一桥拓宽工程有比较完整的了解,本文对其设计仅作一般性介绍,而着重介绍了该工程的施工。紧靠老桥的上、下游各修一座新桥,这在建桥事业中还不多见。并且水中有一墩的基桩正置于严重挤压破碎的泥灰岩层中,又给施工带来的难度是可想而知的。文中对在该墩钻孔桩施工中使用“混合循环法”所取得的成功,作了重点介绍。跨越主河槽的3孔连续箱梁,两个中间墩高而细,设计时考虑到其相对的柔性,将两中间支承布置为固定支座,而两端支承为活动支座,使其结构颇具特色。该桥连续箱梁悬臂现浇使用的挂篮也别具一格。其结构轻巧,给施工带来了很大的方便。
In order to make readers have a complete understanding of Wuhan Jianghan First Bridge Widening Project, this article only gives a general introduction to the design, but focuses on the construction of the project. Close to the old bridge, the lower reaches of each repair a new bridge, which is still rare in the bridge construction. And the foundation piles with a pier in the water are placed in a serious crushed marl layer, but also to the construction of the degree of difficulty is conceivable. The article made a brief introduction of the success of the “mixed cycle method” in the construction of the pier bored pile. The 3-hole continuous box girder spans the main channel. The two intermediate piers are tall and thin. Considering their relative flexibility in design, the two intermediate supports are arranged as fixed supports while the two ends are supported as movable supports, Features. The continuous box girder cantilever cast-in-place hanging basket is also unique. Its lightweight structure, to the construction has brought great convenience.