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中国轻纺城体育中心体育场为开合屋盖体育场,其固定屋盖长轴跨度为267m,短轴跨度为206m。主受力结构为井字形双向立体桁架,采用了超大跨并联式柔性下弦组合桁架结构体系。该4根并联的柔性下弦构造体系和200mm直径650级等强合金钢拉杆均为国内首次出现,施工难度大,缺少相应施工经验。对该体系的施工重、难点进行了分析,详细介绍了超大跨立体桁架的安装、并联柔性下弦的安装及预紧、屋盖整体同步卸载及柔性下弦内力被动张拉等施工关键技术,希望能为今后类似项目的并联式施工提供借鉴。
The stadium of China Textile City Sports Center is a stadium for opening and closing roofs. The fixed roof has a long shaft span of 267m and a short shaft span of 206m. The main force structure for the well-shaped two-way three-dimensional truss, the use of large-span parallel flexible lower chord truss structure system. The four parallel flexible lower chord system and 200mm diameter 650-strength alloy steel rod are the first time in China, the construction is difficult, lack of corresponding construction experience. The construction heavy and difficult points of the system are analyzed. The key construction technologies such as the installation of super-span span truss, the installation and pre-tensioning of parallel flexible lower chord, the unloading of the whole roof and the passive tensioning of flexible lower chord are introduced in detail. It provides reference for the parallel construction of similar projects in the future.