挂篮悬臂浇筑钢筋混凝土拱桥施工控制研究

发布时间：2018-01-13 04:36

本文关键词：挂篮悬臂浇筑钢筋混凝土拱桥施工控制研究　出处：《重庆交通大学》2014年硕士论文　论文类型：学位论文

【摘要】：目前，悬臂浇筑法作为一种新型的施工工艺应用于拱桥修建过程中，该方法克服了不利地形的缺陷，使得拱桥也能像斜拉桥和连续刚构桥那样分阶段浇筑施工，具有投资相对较少、施工方便、结构整体性好、后期养护少、维修简单的优势。为我国西部地区拱桥的发展打开了广阔的前景。由于悬臂浇筑法在国内应用较少，，工艺尚未成熟，因此建立一套合理的施工控制体系来保证拱桥悬臂施工过程的安全性、成桥线形和内力能够符合设计要求就显得尤为重要。本文在收集和研究已有国内外资料和成果的基础上，围绕该课题的存在，进行如下的研究工作： ①为了保证大跨度悬臂浇筑钢筋混凝土拱桥施工过程的安全性及成桥线形和内力能够满足设计要求，提出建立与其施工工艺相适应的施工控制体系； ②在总结国内外桥梁施工控制体系的基础上，给出悬臂法施工控制体系建立的原则、施工控制建立的目的与任务及如何建立施工控制体系；并以马蹄河特大桥为例，建立相关施工控制系统； ③采用桥梁专软件Midas/Civil建立全桥有限元模型，考虑混凝土收缩徐变，对施工控制过程中进行仿真计算，给出预计控制目标状态成桥位移、内力等；在拱圈最大悬臂阶段，对结构的自重和抗风稳定性进行了研究，得出在风荷载对拱圈的稳定性影响较小。 ④提出悬臂浇筑施工过程中影响施工控制目标的关键问题，挂篮作为桥梁悬臂浇筑施工过程中主要承重设备，挂篮刚度及行走过程安全性是桥梁修建过程中较为关心的问题，也是影响拱圈线形的重要因素，本文通过Ansys软件对施工过程中的主要承重设备挂篮进行刚度检算，并对挂篮行走系统抗倾覆性进行验算，确保施工过程的安全性；总结索力优化的方法，给出施工过程中的合理的调索依据、探讨拱圈合拢方法及成桥后索力拆除等问题，进行相应的分析及总结。 ⑤对悬臂浇筑施工过程中的主要相关参数进行敏感性分析，给出影响较大的几种参数，在设计阶段及施工控制中应给予重视，对以后采用此方法修建的桥梁提供参考依据。
[Abstract]:At present, the cantilever pouring construction technology as a new application in bridge construction process, the method overcomes the defect of the unfavorable terrain, which can also staged construction of arch bridge as cable-stayed bridge and continuous rigid frame bridge that has a relatively small investment, convenient construction, good overall structure, less maintenance, maintenance simple advantage. Opened up broad prospects for the development of arch bridge in western region of China. Because the cantilever method rarely used in China, technology is not yet mature, therefore to establish a reasonable construction control system to ensure the safety of arch bridge cantilever construction process, the internal force and alignment of bridge can meet the design requirements is particularly important.
On the basis of collecting and studying the existing domestic and foreign data and achievements, the following research work is carried out around the existence of the subject:
(1) in order to ensure the safety of the long span cantilever casting reinforced concrete arch bridge in construction process, and the alignment and internal force of the finished bridge can meet the design requirements, a construction control system suitable for its construction technology is proposed.
Secondly, on the basis of summarizing the bridge construction control system at home and abroad, the principle of cantilever construction control system is established, the purpose and task of construction control is established, and how to set up the construction control system; and the related construction control system is built with the example of the horseshoe River Bridge.
The bridge professional software Midas/Civil to build the finite element model of the whole bridge with the consideration of concrete shrinkage and creep, the simulation of the process of construction control, given the expected control target state of bridge displacement, internal force of arch; in the largest cantilever stage, the structure deadweight and wind stability were studied, the influence of wind load on the stability of arch the smaller.
The proposed key problems for the construction process of cantilever construction control target, the hanging basket equipment as the main load-bearing bridge cantilever construction process, the hanging basket stiffness and walking safety is more concerned in the process of building a bridge, and is also an important factor affecting the shape of arch ring, this paper through the Ansys software main bearing equipment for construction in the process of hanging basket stiffness calculation, and the hanging basket walking system of anti overturning stability checking, ensure the safety of construction process; summarize the method of optimization of cable force, given the construction process of the reasonable cable adjustment basis, explore arch bridge and construction method of cable force demolition and other issues, the corresponding to analyze and summarize.
The sensitivity analysis of the main parameters in the cantilever casting process is carried out, and several parameters that are more influential are given. Attention should be paid to the design stage and construction control, which will provide a reference for the bridge constructed by this method later.

【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.22;U445.4

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