矮塔斜拉桥悬浇施工线形控制研究

发布时间：2018-11-27 11:30

【摘要】：随着国家加大对中西部基础设施建设的投入,越来越多的大跨径桥梁在我国大地拔地而起。但是跨径的增加也会给桥梁的设计和施工带来难度,如主梁和索塔压应力过高,施工中标高难以控制以及箱梁挠度过大等问题。同时,施工阶段结构的变形、截面的应力状态是不断变化的,这对施工质量和施工安全是不利的,而且直接影响到成桥线形与成桥的受力状态,因此,对大跨径预应力混凝土斜拉桥来说,进行桥梁线形控制很重要。本文从预应力混凝土斜拉桥的施工控制研究的全面性进行考虑,简单介绍了预应力混凝土斜拉桥的发展状况、结构构造特点、国内外施工控制研究的发展的重要性。进一步介绍了桥梁施工控制的目的、桥梁施工线形控制的方法及影响桥梁施工线形控制的因素。以安徽省淮南市淮上淮河大桥主梁悬臂现浇施工监控的工程案例为背景,详细的阐述了淮上淮河大桥施工控制的内容、一般理论和方法。其中重点介绍淮上淮河大桥在悬臂施工过程中线形控制在施工控制中施工阶段、控制节点、控制内容,包括混凝土浇筑前后、预应力张拉前后、主桥挂索、合拢顺序、临时支撑拆除、调索对桥梁线形的影响,同时也详细的叙述了主塔、墩、主桥线形控制的具体监控工艺,叙述了应力效应、温度效应和挂篮预压对线形有着密不可分的联系。运用大型有限元软件Midas-Civil建立大桥模型,对大桥最大悬臂状态、中跨合拢状态、成桥后状态下进行应力、弯矩、挠度的分析,并且获得每一号段的预拱度,来指导现场施工。对悬臂浇筑施工过程进行计算机仿真计算并与现场观测的实际情况相结合,不断修正模型参数,合理调整下一阶段的预拱度,来指导下一阶段施工,最终使桥梁顺利合拢,达到预期的理想线形效果。
[Abstract]:With the government increasing investment in infrastructure construction in the central and western regions, more and more long-span bridges have emerged in China. However, the increase of span will also bring difficulties to the design and construction of bridges, such as the high compressive stress of the main girder and cable tower, the difficulty of controlling the elevation in construction and the excessive deflection of the box girder. At the same time, the deformation of the structure and the stress state of the section are constantly changing in the construction stage, which is unfavorable to the construction quality and construction safety, and has a direct impact on the shape of the completed bridge and the stress state of the completed bridge. Linear control of long span prestressed concrete cable-stayed bridge is very important. Based on the comprehensive study of construction control of prestressed concrete cable-stayed bridge, this paper briefly introduces the development of prestressed concrete cable-stayed bridge, structural characteristics and the importance of the development of construction control research at home and abroad. The purpose of bridge construction control, the method of bridge construction alignment control and the factors influencing bridge construction alignment control are further introduced. Based on the engineering case of the cantilever cast-in-place construction monitoring of the main girder of Huaishang Huaihe River Bridge in Huainan City of Anhui Province, the contents, general theory and methods of the construction control of the Huai-Shang Huaihe River Bridge are expounded in detail. This paper mainly introduces the linear control of Huaihe River Bridge in the construction stage of construction control, the control node, the control content, including the prestressing tension before and after the concrete pouring, the cable hanging of the main bridge, and the closing sequence. The influence of temporary support removal and cable adjustment on the alignment of the bridge is also described in detail. At the same time, the monitoring technology of the main tower, pier and main bridge linear control is also described in detail. The stress effect, temperature effect and hanging basket preloading are closely related to the alignment. The model of the bridge is established by using the large-scale finite element software Midas-Civil. The stress, bending moment and deflection of the bridge under the condition of the maximum cantilever state, the middle span closing state and the post-completion state are analyzed, and the pre-arch degree of each section is obtained to guide the field construction. The computer simulation calculation of cantilever pouring construction process is carried out and combined with the actual situation observed in the field. The model parameters are constantly revised and the prearch degree of the next stage is adjusted reasonably to guide the construction of the next stage, and finally make the bridge close smoothly. Achieve the desired linear effect.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U445.4

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