【作者】 陈绍游；

【导师】 鲍广鑑； 姚刚；

【作者基本信息】 重庆大学 ， 结构工程， 2005， 硕士

【摘要】 在桥梁工程领域,为满足使用功能和承载功能的要求,大跨度钢箱梁应用比较广泛,而在大跨度建筑工程领域,钢箱梁的应用相对较少,更多的是采用网架结构、立体桁架等空间结构。与大跨度钢桥梁相比,建筑工程中的大跨度钢结构具有柔性更大,安装精度要求更高的特点,结构变形控制显得更加重要。虽说实腹式钢梁用于大跨度结构并不经济,但钢箱梁具有截面性能佳、结构承载能力高、外表平整美观等优点,如果恰当减小壁厚,合理优化结构,钢箱梁也能体现较好的经济性,从而进一步扩展其在建筑工程领域的应用范围。　本文以大跨度屋盖结构中的钢箱梁制作与分段安装技术为研究对象,分别讨论了大跨度箱形梁的施工模拟与预拱值确定、制作与安装方法、胎架设计与安装、分段安装工艺与变形控制技术、安装过程的定位测控技术,并以深圳会展中心为工程实例,阐述典型大跨度钢箱梁的制作与分段安装过程。主要内容包括以下几方面:　1、大跨度箱形梁的施工模拟与预拱值确定　通过结构分析,讨论了胎架支承状态和无胎架支承状态两种工况的结构应力和变形情况,为施工开展奠定了理论基础。采用分段吊装法进行大跨度箱形梁安装前,应首先确定其放样状态,从而保证结构落架后回到初始状态(设计状态)。为此,本文阐述了大跨度箱形梁的预拱确定方法——逆迭代法,并以深圳会展中心箱形梁为实例说明计算过程。2、箱形梁的制作与安装方法以箱形梁的制作流程为主要思路,重点阐述了箱形梁的板件制作工艺、组装工艺、焊接工艺与整体预拼装工艺,强调制作过程的变形控制措施;并总结归纳了大跨度箱形梁的各种安装方法。3、胎架设计与安装阐述了胎架的构造设计方法、强度与稳定性计算方法、胎架受力工况分析法及其制作与安装技术。4、箱形梁的分段安装工艺与变形控制技术　详细叙述了箱形梁的分段划分、构件运输与堆放、构件拼装、构件吊装、施工焊接等安装工艺,以及箱形梁结构的整体释放控制措施。5、箱形梁安装过程的定位测控技术　对工程全局与结构局部细节的定位测量方法做了详细的阐述,并总结了结构变形监测和应力监测方法。更多还原

【Abstract】 In order to meet the challenge of usage and load-supporting, long span steel box beam is extensively used in the field of bridge engineerings. However, steel box beam is used in few building engineerings,but space structures such as gird structure, stereo truss and so on. Compare with long span steel bridges, steel structures of building engineerings have features as more flexibilitier and more strict installation accuracy, structure deformation control is more important. It’s uneconomic that solid web girds are used in long span structures, but have merits as favorable cross-section nature, favorable load-supporting capability and smooth appearance.If thickness of slab reduced, structure rationally optimized, steel box beam can possess preferable economization, and expand its building field of application further. Fabrication and lifting segment by segment technology for is regarded as the study object of the text. Based on the above condition, study counter-arhed values determination, methods of fabrication and installation, designation and installation of falseworks, technologies of lifting segment by segment and deformation control, technologies of localization and measurement.Besides, illustrating Shenzhen conference and exhibition center, expatiates fabrication and lifting process of long span steel box beam. The main research contents are as follows: 1, Counter-arhed values determination of box beam Discuss the variation of stress and deformation of structure with falsework or no by structural analysis, which can be base of structure construction. Before install long span box beam segment by segment, lofting state should be determined, by this mean, structure can restitute initial state. Therefore, the paper expatiates counter-arched method of long span box beam-iteration, and the process of counter-arched calculation of Shenzhen conference and exhibition center. 2, Fabrication and installation methods of box beam Regard fabrication process of box beam as main route, fabrication technology of plates, assembly technology, welding technology, and integral consolidation technology are depicted in the paper. Futhermore, various install methods are generalized in the paper. 3, Falsework designation and installation the constitution designation methods, strength and stability calculation methods, behaviour analysis methods, and fabrication and installation technology are expatiated in the paper. 4, Technologies of lifting segment by segment and deformation control of box beam Segments division, transportation and stacking of components, consolidation of components, lifting of components, field welding, and control means in the process of box beam release are particularly depicted in the paper. 5, Location and measuring technologies in process of box beam installation It is particularly depicted in the paper that global and local detail measuring methods of engeering, and methods of structure deformation monitor and stress monitor. 6, Case study On the basis of above basic theory, fabrication and installation technologies of long span box beam in Shenzhen Conference and exhibition center is discussed, and solving methods of several technical difficulties are also introduced. Objecting summarizing fabrication and installation of long span box beam, summarizing the couter-arch method, fabrication technology, lifting-segment-by –segment technology, and deformation control measures, bring forward the importance of ribbed stiffener to box beam, variation of stress and deformation of structure after falseworks are striked,behaviour analysis method of falsework. It is practical valuable to promote the theorization and generalization of fabrication and installation technologies of long span box beam.更多还原