大跨径组合式移动模架的施工安全及预拱度控制技术

发布时间：2018-03-17 20:23

本文选题：移动模架　切入点：施工安全　出处：《长沙理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：移动模架法具有自动化程度高、施工质量好、施工周期短、经济可行、施工过程中对周围生态环境破坏小等优点,在中小跨径预应力钢筋砼等高箱梁桥施工中获得广泛应用。但从以往工程实例来看,移动模架法在施工安全以及砼主梁成桥线形控制方面依然存在不少问题,特别是在采用大跨径移动模架施工时,以上问题尤为突出,这严重阻碍了移动模架法在国内的推广应用。本文针对移动模架的施工安全与预拱度控制问题,以建设中的采用移动模架法施工的大岳高速14标段洞庭湖大桥滩地引桥为工程背景,从提高移动模架法的施工安全、砼主梁施工线形等角度出发,对移动模架的施工工艺、预压试验方案、施工安全、预拱度控制等进行了相应理论研究和实践应用。具体工作如下:(1)综述了移动模架法在国内外的发展历程及其研究现状,在此基础上论述了对移动模架的施工预拱度及施工安全控制技术进行研究的必要性,并简单介绍了论文所依托的工程背景。(2)简述MSS55组合式移动模架基本构造、施工工艺以及相应注意事项,为今后编写移动模架法指南提供相应素材。(3)结合多种设计规范,应用大型商用有限元软件建立MSS55组合式移动模架关键构件仿真分析模型,进行了最不利工况下的数值仿真验算。结果表明:除前吊梁外,MSS55组合式移动模架系统的其余关键构件的刚度、强度以及稳定性指标均符合相关规范的要求。并针对前吊梁存在应力安全储备不足情况,提出了相应修改意见。(4)简述了14标段组合式移动模架预压试验方案,测试了MSS55移动模架各测点在预压试验各级荷载作用下的挠度和应力值。通过对比预压试验理论数据与实测数据,验证了移动模架关键构件仿真计算结果,初步确定了预拱度计算模型参数,进一步确保了移动模架的施工安全。(5)运用有限元软件建立预应力砼主梁施工全过程分析模型,并通过现场预压试验对移动模架有限元模型计算参数进行修正,进而计算出预拱度,以指导施工,并根据施工过程中反馈的信息实时修正模型参数。
[Abstract]:The moving mould frame method has the advantages of high automation, good construction quality, short construction period, economic feasibility and little damage to the surrounding ecological environment during construction. It has been widely used in the construction of medium and small span prestressed reinforced concrete equal-height box girder bridges. However, from the past engineering examples, there are still many problems in the construction safety and the linear control of concrete main girder bridge by moving formwork frame method. Especially in the construction of long span moving mould frame, the above problems are especially prominent, which seriously hinders the popularization and application of moving die frame method in China. This paper aims at the construction safety and pre-arch degree control of moving die frame. Taking the approach bridge of Dayue High-speed No.14 section Dongting Lake Bridge under construction as the engineering background, the construction technology of the movable formwork frame is discussed from the point of view of improving the construction safety of the moving formwork frame method and the construction line shape of the main beam of concrete, and so on, in the view of improving the construction safety of the moving formwork frame method and the construction alignment of the concrete main beam, etc. The theoretical research and practical application of preloading test scheme, construction safety, pre-arch control and so on are carried out. The specific work is as follows: (1) the development history and research status of moving die frame method at home and abroad are summarized. On this basis, the paper discusses the necessity of research on the construction pre-arch degree and construction safety control technology of the movable die frame, and briefly introduces the basic structure of the MSS55 combined movable die frame. The construction technology and the corresponding matters needing attention provide the corresponding material for compiling the guide of moving mould frame method in the future. Combining with various design specifications, the simulation and analysis model of key components of MSS55 combined mobile die frame is established by using large-scale commercial finite element software. The results show that the stiffness of the key components of the MSS55 combined movable die frame system except for the front suspension beam is verified by numerical simulation under the most unfavorable working conditions. The strength and stability indexes are in line with the requirements of the relevant codes. In view of the shortage of stress safety reserve in the front suspension beam, the corresponding modification opinion is put forward. (4) the pre-compression test scheme of the 14 segment combined movable die frame is briefly described. The deflection and stress values of each measuring point of MSS55 moving die frame under various loads of preloading test are tested. By comparing the theoretical data of preloading test with the measured data, the simulation results of the key components of the moving die frame are verified. The parameters of pre-arch calculation model are preliminarily determined to ensure the construction safety of the moving formwork frame. The finite element software is used to establish the analysis model of the whole construction process of the prestressed concrete main beam. The calculation parameters of the finite element model of the moving die frame are modified through the field preloading test, and then the pre-arch is calculated to guide the construction, and the model parameters are revised in real time according to the feedback information during the construction.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.4

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