高速铁路现浇梁支架及钢管桩基础施工控制技术研究

发布时间：2018-03-16 04:28

本文选题：高速铁路　切入点：碗扣支架　出处：《天津大学》2014年硕士论文　论文类型：学位论文

【摘要】：我国近些年高速铁路发展势头迅猛，经过几年的不懈努力，目前，中国在这方面的发展速度和技术上都是较为领先的。由于高速铁路的运行速度较快，为了使其平稳安全的运营，线路基础几乎全部为高空架设的混凝土桥，对于线路上要跨越的河流、道路等有需要采用大跨度的连续梁桥。对于铁路大跨度连续梁桥的施工方法有许多，但是支架现浇法凭借其施工速度快、整体工期短、规范化作业等优点，仍然被广泛的应用。但同时由于在施工过程中对各种偶然因素考虑的不周，忽略了施工过程中监控的重要性，，再加上施工质量及质检管理体系的不完善，桥梁支架倒塌事件频发，造成了很多不必要的人员伤亡和国家财产损失，因此，需要对铁路现浇梁碗扣支架施工全过程中的施工监控方法和技术进行深入的探讨分析，以避免类似事件的重演。本文以北京至上海新修高速铁路三标段，跨伊家河段的48m+80m+48m现浇梁施工过程为背景，来说明混凝土现浇梁支架施工的方案设计、受力分析、施工监控方案设计和数值分析方法等分析流程。本工程工期较紧，因此选用了满堂支架法进行施工，但是由于跨越的伊家河常年不断流，同时京沪高铁为双线铁路，上面的梁体自重较大，贝雷梁承受不了如此重的荷载，因此经过方案必选后采用钢管桩平台基础来跨越伊家河段，以此作为碗扣支架的基础。为了检验此方案的合理性，并为施工监控提供理论数值，保证工程如期安全的完工，并为以后类似工程提供可借鉴的方案，本文对碗扣支架和钢管桩平台的各施工阶段的受力状况进行了研究和分析，主要工作及研究成果如下：（1）结合具体工程情况，经方案比选后，选用了钢管桩平台基础和碗扣支架的支撑系统方案进行施工，并对此方案全过程施工方法进行了详细的安排；（2）对支撑体系分别进行了受力检算和数值模拟分析，得到了各施工工况下的理论数值，为施工监控提供了参考值，并对支撑体系弱点部位进行了标示，可参考此方案进行体系加固和重点监控，以确保施工的安全进行；（3）依据方案和数值分析结果，编制了全桥支撑体系的施工监控方案，此方案可为以后类似工程的施工提供理论指导。
[Abstract]:In recent years, China's high-speed railway has been developing rapidly. After several years' unremitting efforts, China is now in the leading position in the development and technology of high-speed railway. In order to ensure its smooth and safe operation, the line is based on almost all concrete bridges erected at high altitude. For rivers to be crossed on the line, There are many construction methods for railway long-span continuous beam bridges, but the cast-in-place support method has the advantages of fast construction speed, short overall construction period, standardized operation, etc. It is still widely used. But at the same time, due to the improper consideration of various accidental factors in the construction process, it ignores the importance of monitoring in the construction process, plus the imperfection of the construction quality and quality inspection management system. The frequent collapse of bridge support has caused a lot of unnecessary casualties and national property losses. Therefore, it is necessary to deeply discuss and analyze the construction monitoring methods and techniques during the whole construction of cast-in-place beam and bowl buckle support. To avoid a repetition of similar events. In this paper, based on the construction process of 48m 80m 48m cast-in-place beam in the third section of Beijing-Shanghai new high speed railway and the span of Yinjihe reach, the scheme design and force analysis of concrete cast-in-situ beam support construction are described. Construction monitoring scheme design and numerical analysis methods and other analytical processes. The construction period of the project is relatively tight, so the full hall support method is used to carry out the construction. However, because the Yia River crossing is not cut off all the year round and the Beijing-Shanghai high-speed railway is a double-track railway, the beam above has a larger body weight, so the Beere beam cannot bear such a heavy load. Therefore, the foundation of steel pipe pile platform is adopted to cross the Yijia reach after the project must be selected, which is used as the foundation of the bowl buckle support. In order to test the rationality of this scheme, and to provide the theoretical value for construction monitoring and control, to ensure the completion of the project as scheduled and safely, And for similar projects in the future can be used for reference, this paper research and analysis of the bowl buckle support and steel pipe pile platform of the construction stage of the force situation, the main work and research results are as follows:. 1) combined with the concrete engineering situation, after the scheme comparison and selection, the support system scheme of the steel pipe pile platform foundation and the bowl buckle support is selected to carry on the construction, and the construction method of the whole process of the scheme is arranged in detail; (2) the stress check and numerical simulation analysis of the bracing system are carried out, and the theoretical values under various construction conditions are obtained, which provide the reference value for construction monitoring and control, and mark the weak parts of the bracing system. We can refer to this scheme for system strengthening and key monitoring to ensure the safety of construction. According to the scheme and numerical analysis results, the construction monitoring scheme of the whole bridge bracing system is worked out, which can provide theoretical guidance for the construction of similar projects in the future.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.4

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