黄舣长江大桥施工监控技术研究

发布时间：2018-04-15 13:35

本文选题：黄舣长江大桥 + 施工　；参考：《重庆交通大学》2014年硕士论文

【摘要】：大跨度斜拉桥的施工监控过程是一项非常复杂的工作,其施工监控的分析研究已成为许多桥梁工程师及桥梁研究者们共同关注和重视的一个重要课题,本文所依托的黄舣长江大桥为高低塔混合梁斜拉桥,非传统的等高塔斜拉桥,该桥合龙段在靠近矮塔一侧而非桥梁中部,而且主跨设计采用钢箱梁,所以合龙段两端的标高控制以及合龙段长度的确定都变得异常复杂。斜拉桥是高次超静定结构,其施工方法和安装顺序与成桥后的主梁线性和结构内力有密切的关系。斜拉桥施工过程中要对索力进行调整,这将引起主梁内力和主塔等施工控制参数的理论计算值发生变化,斜拉桥施工程序也明确规定,为了确保施工过程的安全以及成桥线形满足设计要求、成桥后的应力在允许范围内,必须在斜拉桥施工过程中加以有效的监控管理。本文首先介绍了斜拉桥和高低塔斜拉桥国内外的发展概况及发展前景。其次对本文工程背景和本文的研究目标也进行叙述,突出了该桥施工监控的重点及难点,紧接着介绍了如何采用正装计算法对大桥实际施工过程进行模拟计算,结合实际的施工过程,对钢箱梁梁段和斜拉索的下料及安装提供技术数据。然后以黄舣长江大桥为例,为保证黄舣长江大桥成桥后内力和线形满足设计要求,本文研究如何通过采用实地测量与有限元方法理论计算相结合的方法,首先对钢箱梁节段安装进行高程预测,再通过调整拉索索力对偏差进行调整,使桥梁主梁的标高控制在或接近设计标高。同时介绍如何借助先进的测试仪器,通过预埋传感器,对实体结构进行测试,掌握其实体结构的真实应力,再通过对结构应力分析,找出拉应力超出允许值范围的有关点位,对其采取加强措施,防止发生开裂现象。其次,本章还阐述通过对斜拉索的索力进行进行实时监测,保证了拉索在最不利工况下的内力能满足使用要求的方法。本章最后通过对主梁实测标高、主塔实际偏位、斜拉索实际索力和各关键截面与理论计算值及规范要求值进行比较,所得结果均满足要求,印证了所采取的监控方法行之有效,具有可操作性。
[Abstract]:The construction monitoring process of long-span cable-stayed bridge is a very complicated work. The analysis and research of construction monitoring has become an important issue that many bridge engineers and bridge researchers pay attention to.The Huangyue Yangtze River Bridge supported in this paper is a hybrid girder cable-stayed bridge with high and low towers and a non-traditional cable-stayed bridge with equal tower. The closure section of the bridge is near the side of the low tower rather than the middle of the bridge, and the main span is designed with steel box girder.Therefore, the elevation control at both ends of the closure segment and the determination of the length of the closure section become extremely complicated.The cable-stayed bridge is a high-order statically indeterminate structure. Its construction method and installation sequence are closely related to the linearity of the main beam and the internal force of the structure after the completion of the bridge.During the construction of cable-stayed bridge, the cable force should be adjusted, which will cause the change of the theoretical calculation value of the internal force of the main beam and the construction control parameters such as the main tower, and the construction procedure of the cable-stayed bridge is also clearly stipulated.In order to ensure the safety of the construction process and the alignment of the bridge to meet the design requirements, the stress after the completion of the bridge is within the allowable range and must be effectively monitored and managed during the construction of the cable-stayed bridge.This paper first introduces the development and prospects of cable-stayed bridges and cable-stayed bridges with high and low pylon at home and abroad.Secondly, the engineering background and research objectives of this paper are also described, highlighting the key points and difficulties of the bridge construction monitoring, and then introducing how to simulate and calculate the actual construction process of the bridge by using the formal calculation method.Combined with the actual construction process, the technical data are provided for the material and installation of the steel box girder section and the stay cable.Then taking the Huangyue Yangtze River Bridge as an example, in order to ensure that the internal force and the line shape of the Huangyue Yangtze River Bridge meet the design requirements, this paper studies how to combine the field measurement with the finite element method.The elevation of the steel box girder is forecasted at first, and then the deviation is adjusted by adjusting the cable force, so that the elevation of the main girder of the bridge is controlled at or close to the design elevation.At the same time, it introduces how to test the solid structure by means of advanced testing instruments, through embedded sensors, to master the real stress of the solid structure, and then through the analysis of the structural stress, to find out the relevant points where the tensile stress exceeds the allowable value range.Measures should be taken to prevent cracking.Secondly, this chapter also describes the method of real-time monitoring the cable force to ensure that the internal force of the cable can meet the requirements under the most unfavorable working conditions.Finally, by comparing the measured elevation of the main beam, the actual deviation of the main tower, the actual cable force of the stay cable and each key section with the theoretical calculation value and the required value of the code, the results obtained meet the requirements, which proves that the monitoring method adopted is effective.It is operable.
【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】：U445.4

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