超长预应力混凝土结构分段流水施工探讨

Discussion on segmental construction of over-long prestressed concrete structures

超长预应力混凝土结构中,混凝土收缩、温度、徐变以及预应力引起的结构轴向压缩等参数成为控制结构设计与施工方法的重要因素,混凝土的早期性能导致结构内力分析的复杂性,施工阶段与使用阶段的结构受力体系存在着差异和转换,施工方法和后浇带的设置将影响结构的分析模型和结构的经济性等。本文探讨了超长预应力混凝土结构的“逐层浇筑、逐层张拉”和分段流水等施工方法问题。

In over-long prestressed concrete structures, such parameters as concrete shrinkage ,temperature, creep and axial compression will be impertant dominating factors for design and construction, early concrete performance leads to complexity for analyzing structural internal forces,structural bearing systems are different and transformative between construction stage and use stage, construction method and post - cast strip setup will affect structural analysis model and economy,and so on. ＂one storey cast-one storey tensioned＂ and segmental construction were discussed in the paper.