大跨度悬索桥钢围堰基础施工风险分析研究
发布时间：2019-05-03 18:26
【摘要】：目前大型桥梁施工都采用围堰进行水中墩施工，施工过程往往会发生风险，威胁着施工安全。武汉市鹦鹉洲长江大桥作为一条重要的交通运输通道，其1#墩水中基础施工采用的是钢板桩围堰施工工艺。整个围堰的施工过程受到制作拼装、下河、浮吊插打、下沉等各种风险因素的影响，，威胁着桥梁施工安全。因此进行钢板桩围堰水中墩施工风险分析并提出相应的风险防范措施是十分必要的。本文以武汉市鹦鹉洲长江大桥为依托，采用层次-变异系数理论计算全桥各施工阶段权重值。结果表明钢板桩围堰施工阶段为风险权重最大的阶段，以此开展风险防范措施研究。主要内容如下： 1..运用层次矩阵法对武汉鹦鹉洲长江大桥进行施工风险分析，计算出风险权值最大的施工阶段为1#墩基础施工，在此基础上采用变异系数法对1#墩进行风险分析，由此得到风险权重值最大的施工工序为钢板桩围堰施工，分析结果与施工现场得到的实测结论相吻合。 2.详细阐述了桥梁施工质量风险防范措施与施工安全风险防范措施，并针对层次-变异系数法的风险分析结果，制定了武汉鹦鹉洲长江大桥施工风险防范体系，以1#墩基础为对象提出相应科学合理的风险防范措施，用以指导现场的施工，相应的结论具有重要的理论意义和工程实用价值。
[Abstract]:At present, cofferdam is used in the construction of large-scale bridges, which often leads to risks in the construction process and threatens the safety of construction. As an important transportation channel, the construction technology of steel sheet pile cofferdam is adopted in the foundation construction of No. 1 pier in Wuhan Nauhuozhou Yangtze River Bridge. The construction process of the cofferdam is affected by various risk factors, such as assembling, lowering the river, floating and slicing, sinking and so on, which threaten the construction safety of the bridge. Therefore, it is necessary to analyze the construction risk of steel sheet pile cofferdam and put forward the corresponding risk prevention measures. In this paper, based on the Nauhuozhou Yangtze River Bridge in Wuhan City, the weight values of each construction stage of the bridge are calculated by using the theory of hierarchy-coefficient of variation (coefficient of variation). The results show that the construction stage of steel sheet pile cofferdam is the stage of maximum risk weight, so the risk prevention measures are studied. The main contents are as follows: 1. In this paper, the construction risk analysis of Wuhan Nauhuozhou Yangtze River Bridge is carried out by using the hierarchical matrix method, and the construction stage of the maximum risk weight is calculated as 1 # pier foundation construction. On this basis, the variation coefficient method is adopted to carry on the risk analysis to the 1 # pier. As a result, the construction process of steel sheet pile cofferdam with the maximum risk weight is obtained, and the analysis results are in good agreement with the measured results obtained in the construction site. 2. In this paper, the preventive measures of bridge construction quality risk and construction safety risk are expounded in detail. According to the risk analysis result of hierarchy-coefficient of variation method, the construction risk prevention system of Wuhan Nauhuozhou Yangtze River Bridge is established. Taking 1 # pier foundation as the object, the corresponding scientific and reasonable risk prevention measures are put forward to guide the construction of the site. The corresponding conclusions have important theoretical significance and engineering practical value.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.556
本文编号：2469151
[Abstract]:At present, cofferdam is used in the construction of large-scale bridges, which often leads to risks in the construction process and threatens the safety of construction. As an important transportation channel, the construction technology of steel sheet pile cofferdam is adopted in the foundation construction of No. 1 pier in Wuhan Nauhuozhou Yangtze River Bridge. The construction process of the cofferdam is affected by various risk factors, such as assembling, lowering the river, floating and slicing, sinking and so on, which threaten the construction safety of the bridge. Therefore, it is necessary to analyze the construction risk of steel sheet pile cofferdam and put forward the corresponding risk prevention measures. In this paper, based on the Nauhuozhou Yangtze River Bridge in Wuhan City, the weight values of each construction stage of the bridge are calculated by using the theory of hierarchy-coefficient of variation (coefficient of variation). The results show that the construction stage of steel sheet pile cofferdam is the stage of maximum risk weight, so the risk prevention measures are studied. The main contents are as follows: 1. In this paper, the construction risk analysis of Wuhan Nauhuozhou Yangtze River Bridge is carried out by using the hierarchical matrix method, and the construction stage of the maximum risk weight is calculated as 1 # pier foundation construction. On this basis, the variation coefficient method is adopted to carry on the risk analysis to the 1 # pier. As a result, the construction process of steel sheet pile cofferdam with the maximum risk weight is obtained, and the analysis results are in good agreement with the measured results obtained in the construction site. 2. In this paper, the preventive measures of bridge construction quality risk and construction safety risk are expounded in detail. According to the risk analysis result of hierarchy-coefficient of variation method, the construction risk prevention system of Wuhan Nauhuozhou Yangtze River Bridge is established. Taking 1 # pier foundation as the object, the corresponding scientific and reasonable risk prevention measures are put forward to guide the construction of the site. The corresponding conclusions have important theoretical significance and engineering practical value.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.556
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