新型独立式塔架缆索吊装系统设计及其应用研究

发布时间：2018-03-15 12:35

本文选题：拱桥架设　切入点：新型塔架　出处：《福建农林大学》2015年硕士论文　论文类型：学位论文

【摘要】：无支架缆索吊装是桥梁建设常用的施工方法,产生后至今已见证了无数桥梁的建成,在桥梁建造史上具有重要的地位。然而,传统上吊装系统塔架的研究大多是门式塔架,对于独立式塔架缆索吊装系统的研究却少见报道,因此加强对其进一步研究具有重要的实际意义。本文对一种新型的独立式塔架及其缆索吊装系统的设计进行了研究,结合桥梁实例进行了可行性论证,通过施工监控的理论计算及实测结果分析,总结了该型系统的总体应用实施效果,所作的研究工作可为该型塔架的推广应用提供参考。具体的内容如下：(1)综述了传统门式塔架与独立式塔架在桥梁缆索吊装中的应用现状及缆索吊装施工监控的研究现状,指出了缆索吊装塔架与吊装系统及其施工过程监控存在的问题,进而确定了论文的研究内容。在此基础上,从概念设计上提出了新型独立式塔架缆索吊装系统。其中,塔架部分主要从拼接方式(选用不同连接构件)、整体横移实现方式等方面内容进行说明；吊装系统部分则从工作原理、施工要领等角度论述,之后从安全性、经济性、施工便捷性等层面总结了该型塔架的优点并作分析。(2)本文以宁德市寿宁县坪坑大桥为工程背景,通过实地调查,在掌握与分析该桥所处特殊地形地质及周围环境条件下,因地制宜,确定了本桥合理的吊装方案,即采用新型独立式塔架缆索吊装系统；然后对全桥缆索吊装系统进行索系选型与计算,采用有限元分析软件对塔架结构进行应力分析,接着对塔架横移进行设计与计算,并验算了东、西两岸锚锭系统,全桥具有较高设计完整性,计算结果均能满足设计要求。(3)利用桥梁分析软件Midas对拱肋在拱箱节段吊装与合龙、桥面铺装完成、徐变10年后等不同吊装施工阶段的过程监控进行仿真分析,并绘出主拱肋施工预拱度分布图,其理论计算结果可为主拱肋吊装施工控制及保证拱桥成桥线形提供参考依据。(4)通过入驻现场实测,对坪坑大桥拱肋的高程及轴线偏差进行了监控测量,对主拱圈拱肋截面(如拱腹、拱脚、拱顶等)进行了应变测试,数据表明,拱箱合龙高程及轴线误差满足误差评定要求,内部的应力分布均匀合理,整体趋势与设计预期基本吻合,进而验证了新型独立式塔架缆索吊装系统内部整体工作是有效可行的。
[Abstract]:Scaffolding cable hoisting is a common construction method in bridge construction, and it has witnessed the construction of numerous bridges up to now, which plays an important role in the history of bridge construction. However, the research on the cable hoisting system of the independent tower is rarely reported, so it is of great practical significance to strengthen the further research on it. In this paper, the design of a new type of independent tower and its cable hoisting system is studied. The feasibility of the bridge is demonstrated, and through the theoretical calculation of construction monitoring and the analysis of the measured results, the overall application effect of this type of system is summarized. The research work can provide a reference for the popularization and application of this type of tower. The concrete contents are as follows: (1) the application status of traditional portal tower and independent tower in bridge cable crane installation and the research status of cable crane construction monitoring are summarized. This paper points out the problems existing in the monitoring and control of cable crane tower mounting system and hoisting system and its construction process, and then determines the research contents of the paper. On the basis of this, a new type of independent tower cable hoisting system is put forward from the view of concept design. The tower frame is mainly explained from the aspects of splicing mode (selecting different connecting components and realizing mode of overall transverse movement, etc.); the lifting system part is discussed from the aspects of working principle, construction essentials and so on, and then from the aspects of safety, economy, etc. Based on the engineering background of Pingkeng Bridge in Shouning County, Ningde City, through field investigation, under the condition of mastering and analyzing the special topography, geology and surrounding environment of the bridge, the advantages of this type of tower are summarized and analyzed. According to the local conditions, the reasonable lifting scheme of the bridge is determined, that is, the new independent tower cable hoisting system is adopted, and then the cable system selection and calculation are carried out, and the stress analysis of the tower structure is carried out by using the finite element analysis software. Then the design and calculation of the tower's transverse movement are carried out, and the anchor ingot system on the east and west banks is checked. The whole bridge has high design integrity, and the calculation results can meet the design requirements. (3) the bridge analysis software Midas is used to hoist and close the arch rib in the arch box segment. After the completion of bridge deck paving and creep for 10 years, the monitoring process of different hoisting construction stages is simulated and analyzed, and the distribution map of pre-arch degree of main arch rib construction is drawn. The theoretical calculation results can mainly be used to control the hoisting of arch ribs and to provide reference basis for ensuring the alignment of arch bridges. The elevation and axis deviation of arch ribs of Pinkeng Bridge are monitored and measured through the field measurement. The strain test of the arch rib section of the main arch ring (such as arch belly, arch foot, arch roof etc.) is carried out. The data show that the errors in the height and axis of the closure of the arch box meet the requirements of error evaluation, and the internal stress distribution is even and reasonable. The overall trend is basically in line with the design expectation, which proves that the whole work of the new independent tower cable crane system is effective and feasible.
【学位授予单位】：福建农林大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.464

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