摘要:
国家速滑馆工程大跨度马鞍形单层正交索网结构是目前世界上类似工程中跨度和规模最大的索网结构，拉索规格和内力都较大，承重索和稳定索均采用双索设计，拉索提升、张拉难度大；另外，拉索提升、张拉过程中，环桁架支座只有竖向约束，水平可滑动，环桁架外圈幕墙索被动张拉，施工设计与控制难度大。如何解决这种可变边界条件下大跨度马鞍形单层正交索网结构提升、张拉施工，是国家速滑馆工程施工的关键，直接关系到工程能否按时竣工。
针对这一现状，从拉索定长设计、安装误差消纳、索网编织方法、施工过程仿真分析、提升与张拉施工等方面进行了系统研究，提出拉索定长安装、索网提升初期可适当放宽同步性要求、索网张拉阶段采用等位移同步张拉成形等理念，研究总结出包括拉索定长设计方法、可调节套筒安装误差消纳方法、支座预偏值设计、施工仿真分析、地面编网和分阶段、分步骤、等位移整体提升张拉成形等技术的大跨度马鞍形单层正交索网结构成套施工设计与安装技术。该技术破解了索网结构对施工误差特别敏感的技术难题，成功指导了国家速滑馆索网工程施工，保证了国家速滑馆工程的顺利进行。
Abstract:
The large-span saddle shaped single-layer orthogonal cable net structure of national speed skating oval is the largest span and scale cable net structure in similar projects in the world. The specification and internal force of the cable are large. The load cable and stable cable are designed with double cables, which makes it difficult to lift and tension the cable. In addition, in the process of cable lifting and tensioning, the ring truss support has only vertical restraint, horizontal sliding, and ring truss support It is difficult to design and control the passive tension of the outer ring of truss curtain wall cable. How to solve the lifting and tension construction of large-span saddle shaped single-layer orthogonal cable net structure under the variable boundary conditions is the key to the construction of national speed skating Pavilion, which is directly related to whether the project can be completed on time.
In view of this situation, this paper systematically studies the cable fixed length design, installation error elimination, cable mesh weaving method, construction process simulation analysis, lifting tension construction and other aspects. It puts forward the concepts of fixed length cable installation, appropriate relaxation of synchronization requirements in the initial stage of cable network lifting, and the application of equal displacement synchronous tension forming in cable network tension stage The complete set of construction design and installation technology of large span saddle shaped single-layer orthogonal cable net structure, including calculation method, adjustable sleeve installation error elimination method, bearing pre deflection value design, construction simulation analysis, ground netting, phased, step-by-step, equal displacement integral lifting and tension forming technology. This technology solves the technical problem that the cable net structure is particularly sensitive to the construction error, successfully guides the construction of the cable net project of the national speed skating Pavilion, and ensures the smooth progress of the national speed skating hall project.
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