大开口轮辐式索承网格钢结构预应力施工技术研究
Prestressed Construction Technology for Large-Opening Spoke-Wheel Type Cable-Supported Steel Grid Structures
新疆乌鲁木齐奥林匹克体育中心体育场采用了大开口轮辐式索承网格钢结构体系,该结构作为刚柔结合的新型空间结构,兼具受力稳定、用钢量低等优势,但存在安装难度大、预应力计算复杂、构件协同要求高等技术难点。针对施工过程中的技术难点,本文介绍了张拉施工方案和施工过程中的相关预应力关键技术;对斜撑杆、幕墙、檩条的安装时机、屋盖安装误差、环向索下料误差和环境温度等因素对预应力张拉施工的影响开展了相关分析,最终确定了幕墙与檩条均在张拉前同步安装的施工方案。考虑檩条施工工艺的可行性和经济性,以及后续使用过程中的安全性,提出了高效的檩条低应力安装施工技术,保障了乌鲁木齐奥体中心体育场张拉施工的顺利进行。
A large-opening spoke-wheel type cable-supported steel grid structure is adopted by the XinJiang Urumqi Olympic Sports Center Stadium. As a new type of spatial structure that combines rigidity and flexibility, this structure has the advantages of stable stress and low steel consumption. However, there are technical difficulties such as difficult installation, complex prestress calculation, and high requirements for component coordination. Aiming at the technical difficulties during construction, the tension construction scheme and several key tension techniques are introduced herein. The impact of different factors such as installation timing of diagonal braces, curtain walls, and purlins, roof installation errors, ring cable cutting errors, and temperature on the tension construction is studied. The final construction plan has been determined to install both the curtain walls and purlins synchronously before tensioning. Taking the feasibility and economic efficiency of the purlin installation process, as well as the safety during subsequent using stage, a low-stress high-efficiency installation technique for purlins is proposed, which guarantees the tension construction of the Urumqi Olympic Sports Center Stadium successfully.
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