杭州奥体中心综合训练馆钢结构施工关键技术

Key Technology of Steel Structure Construction of Comprehensive Training Hall of Hangzhou Olympic Sports Center

杭州奥体中心综合训练馆为2022年第19届杭州亚运会场馆之一。其地下钢结构具有构件重、截面形状特殊、施工条件复杂等特点;地上主楼外筒采用与地面呈56.3°交叉编织的斜交钢管网格柱,网格柱直径大、数量多、构件重、现场定位难度大,特别是斜交网格节点的构造和受力复杂,存在较多的隐蔽焊缝和小夹角相贯焊缝,给加工焊接和现场安装带来很大困难。结合其结构形式、工程重难点与施工现场实际情况,详细阐述了施工过程中的重难点及相应的解决措施。通过与土建施工密切配合、优化土建钢筋排布而减少钢结构与土建钢筋的干涉、合理组织施工顺序等措施解决了多专业交叉施工的影响;在复杂的施工环境中开辟了满足施工要求的环形施工道路;运用科学的吊装方法和稳定的临时措施保证结构在施工过程中的安全;采用了“计算机辅助全站仪”的数字化测量技术控制构件安装精度;在深化设计过程中通过大量的分析试验和研究,对斜交网格节点的焊接要求做了创新性的优化,并通过有限元分析验证了优化方案的可行性;利用计算分析软件对钢结构施工过程进行了有限元仿真分析,根据仿真分析结果,确定钢结构施工过程中需重点监测的部位与环节,根据施工过程中悬挑部位构件的应力和位移,确定了以优先拆卸最不利支撑的原则逐点分级拆卸悬挑支撑。上述方法成功运用在该项目上,为类似钢结构工程提供了一定的参考和借鉴。

Hangzhou Olympic Sports Center Comprehensive Training Center is one of the venues for the 19th Asian Games in Hangzhou 2022.The underground steel structure has the characteristics of component weight,special section shape and complex construction conditions.The outer cylinder of the main building on the ground adopts oblique steel tube grid column which is cross-braided with the ground at 56.3°.Large diameter,large number of grid column and heavy components make it difficult to locate on site.Especially,the structure and stress of oblique grid joint are complex,and there are many hidden welds and intersecting welds with small angle,which bring great difficulties to the processing welding and installation on site.By closely cooperating with civil construction,optimizing the arrangement of civil steel reinforcement and reducing the interference between steel structure and civil steel reinforcement,and reasonably organizing the construction sequence,the influence of multi-specialty cross construction was solved.In the complex construction environment,the circular construction road that meet the construction requirements was opened.Scientific hoisting methods and stable temporary measures were used to ensure the safety of the structure in the construction process.Adopting digital measurement technology of“computer-aided electronic total station”to control the installation precision of components;in the process of deepening the design,through a large number of analysis tests and studies,the welding requirements of skew grid joints were innovatively optimized,and the feasibility of the optimized scheme was verified by finite element analysis.The finite element analysis for steel structure construction process was carried out,according to the results of the simulation analysis,the key parts and links to be monitored in the construction process of steel structure were determined;according to the stress and displacement of the cantilever parts during construction,the principle of priority to dismantle the most disadvantageous support was determined,and the cantilever support was removed by stages.The above method had been successfully applied in this project,which provided certain reference for similar steel structure engineering.