大跨度连续刚构桥悬浇施工支撑系统力学特性研究

发布时间：2019-02-20 17:52

【摘要】：在诸多施工风险因素中，施工支撑系统是引起工程质量、导致工程事故发生最具影响力的因素之一。采用悬臂浇筑的大跨度预应力连续刚构桥的主要施工支撑系统有边跨现浇段满堂支架、墩顶0#块托架施工支架、悬臂浇筑的挂篮系统等。为了预防因施工支撑系统引起工程质量、导致工程事故的发生，需要工程施工前，将这些不利因素消灭在萌芽中。因此，本文以某大跨度连续刚构桥施工为依托背景，对采用悬臂施工的支撑系统进行详细受力、稳定性的分析，并对支撑系统的安全问题作出评价。其相关研究可为连续刚构桥悬臂施工的支撑系统的设计、计算、施工安装等提供可靠地依据，具有重要的工程意义和实用价值。本文以某大跨度预应力混凝土刚构桥悬臂施工支撑体系为研究对象,主要围绕以下几个方面展开研究：（1）通过收集资料，了解预应力混凝土刚构桥施工期间安全问题及支撑系统力学特性的相关研究，为本文的相关研究提供参考依据，同时进一步明确本文相关研究的目的与意义。（2）在0#块托架设计资料的基础上，通过建立有限元计算模型，计算了0#块托架在自重、梁体重量、模板吊架等荷载作用下的变形、受力及稳定性，并对结构安全性进行了验算。（3）在悬臂施工挂篮设计资料的基础上，通过建立有限元计算模型，对挂篮在自重、梁体重量、模板吊架等荷载作用下的变形、受力及稳定性进行了安全检算，，并对挂篮安装、移机、拆除等进行了组织设计。（4）在边跨满堂支架设计资料的基础上，借助力学分析手段，对边跨满堂支架及地基承载能力进行了检算，确保施工过程的安全性。
[Abstract]:Among all the construction risk factors, construction support system is one of the most influential factors that cause engineering quality and accidents. The main construction support system of long-span prestressed continuous rigid frame bridge built by cantilever is as follows: side span cast-in-place section full support, pier top 0# block bracket construction support, cantilever pouring hanging basket system, etc. In order to prevent the engineering quality caused by the construction support system and the occurrence of the engineering accident, it is necessary to nip these unfavorable factors in the bud before the construction. Therefore, based on the construction of a long-span continuous rigid frame bridge, this paper makes a detailed analysis of the force and stability of the bracing system using cantilever construction, and makes an evaluation of the safety of the bracing system. The related research can provide reliable basis for the design, calculation, construction and installation of cantilever support system of continuous rigid frame bridge, which has important engineering significance and practical value. In this paper, a long-span prestressed concrete rigid frame bridge cantilever construction support system as the research object, mainly around the following aspects: (1) through the collection of data, To understand the safety problems and the mechanical characteristics of bracing system during the construction of prestressed concrete rigid frame bridge, to provide a reference for the relevant research in this paper, and to further clarify the purpose and significance of the relevant research in this paper. (2) on the basis of the design data of 0# block bracket, the deformation, force and stability of 0# block bracket under load such as deadweight, beam weight and formwork hanger are calculated by establishing finite element calculation model. The structural safety is checked and calculated. (3) on the basis of the design data of cantilever construction hanging basket, the deformation, force and stability of hanging basket under load such as deadweight, beam weight and formwork hanger are checked and calculated by establishing finite element calculation model. And the hanging basket installation, moving machine, demolition and other organizational design. (4) on the basis of the design data of the side span full hall support, by means of mechanical analysis, the bearing capacity of the side span full hall support and the foundation is checked and calculated to ensure the safety of the construction process.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.4;U448.23

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