索穹顶结构施工技术研究

以直径71.2 m索穹顶工程为对象，介绍索穹顶施工的关键技术，即结构施工偏差及构件尺寸误差的控制、结构的安装成形方法、预应力张拉次序与方法、施工仿真分析与监测控制等。将内中脊索、内中斜索及环向索都做成定长索，外斜索和外脊索做成可调索，调整其长度补偿耳板的径向施工误差；在总结类似工程施工经验的基础上，提出地面拼装、整体同步提升外脊索和外斜索进行安装、张拉外斜索使结构成形的施工方法，减少高空作业量，保证施工的安全；根据索穹顶结构为柔性结构且具有多个对称轴的特点制定了分级分批张拉的施工方案，完成对索穹顶结构的张拉施工，从监测数据看出，施工完毕以后的位形和设计位形基本一致。

Research on construction techniques of cable dome roof

This paper focuses on the solution to the technical problems confronted during the construction process of the cable dome with a diameter of 71.2 m,i.e.the controlling of structural construction error,component size error,installation and shaping methods of structures,the order and method of pretensioning and the construction simulation and monitoring.The internal and middle ridge cables,internal and middle slope cables are fixed length cables.The outer ridge cable and the outer slope cable are variable length cables to adjust the construction error.On the basis of a brief summary of the construction experience abroad,it proposes the method of integral assembling on the ground and synchronous hoisting of outer ridge and slope cable,shaped by stretch the outer slope cable,which has reduced aerial work and guaranteed constriction security.Secondly,based on the theory that the cable dome is a flexible construction with several symmetry axis,the construction method of verified batches and levels was finally proposed,based on which,tension construction of the project was completed.From the monitoring data,the configuration of the actual structure was generally identical with the configuration designed.