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文章针对预应力混凝土桥梁中大长宽比的局部构造由于施工过程中的温度应力及收缩应力过大引起裂缝的现象,提出了一种新的施工工艺———分仓施工。以野三河特大桥为工程背景,基于有限元的基本原理利用单元生死技术详细分析了分仓施工工艺的合理性及必要性;且在桥墩首节实心段C50混凝土及箱梁0#块C55混凝土施工中成功的应用了分仓施工技术,有效解决大长宽比高强混凝土构件浇注后温度应力、收缩应力过大而产生过多裂缝的问题。该方法可为其他同类桥梁的施工及设计提供参考。
Aiming at the local structure with large aspect ratio in prestressed concrete bridges, a new construction technology, ie sub-warehouse construction, is put forward due to the temperature stress during construction and the crack caused by excessive shrinkage stress. Taking the Yesanhe River Bridge as the engineering background, based on the basic principle of the finite element, the rationality and necessity of the construction of the sub-tank are analyzed in detail by using the unit life-and-death technique. In the first section of the piers, the C50 concrete in the solid section and the C55 concrete in the box girder 0 # Construction of the successful application of sub-warehouse construction technology to effectively solve the large aspect ratio high-strength concrete pouring temperature stress, shrinkage stress is too large and the problem of excessive cracks. This method can provide reference for the construction and design of other similar bridges.