无粘结预应力筋在超长、超宽、异形边墙混凝土结构裂缝控制中的应用分析:《隧道建设》2012年S2期

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@ _9bA#KcVS.B0无粘结预应力筋在超长、超宽、异形边墙混凝土结构裂缝控制中的应用分析水利论文m!`5PU_.W3x}

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b wL+ax;J }s uT0【摘要】:为减少地下室混凝土结构在使用中受温差等影响出现的裂缝,结合杭州地铁七堡综合体核心区地下工程实例,边墙采用无粘结后张法预应力及主体结构后浇带的设置技术,针对超长、超宽、异形边墙混凝土结构特点,进一步深化预应力设计,对不设永久伸缩缝混凝土结构开裂的问题进行了阐述,达到减少边墙混凝土结构裂缝控制的目的,实际效果明显。

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0引言随着我国城市化发展步伐的加快,规划用地的减少,用地矛盾日趋紧张,要求空间利用率最大化。无论大型民建项目如城中村改造项目还是公建项目如会展中心、客运车站都会设置大量的地下室,但地下结构的渗漏水无论对于施工过程中还是投人使用后,都会面临的一个难题[1]。在建筑

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