受既有线控制的重庆白沙沱长江大桥施工风险控制研究

发布时间：2019-03-01 13:18

【摘要】：受既有线影响的桥梁在其施工过程中既要满足既有线运营安全,又要保证大桥的施工安全及进度,施工中面临既有线安全防护和拆迁难度大、地形条件复杂、跨越限制条件多等诸多因素的影响。正是受这些特点和因素的综合制约,决定了受既有线影响的大桥施工过程中存在大量安全风险问题。而在工程实践中,对这些安全风险问题的研究、控制还很薄弱。如何系统地对受既有线影响的大桥施工安全风险进行分析、评价和有效控制,最大限度地降低施工安全风险,达到工程项目建设目标,具有重要的理论意义和工程实践价值。首先,对风险的基本概念、本质、风险辨识及评价的基本方法和风险控制的基本方法及理论进行了归纳总结,确定了桥梁施工风险控制的基本内容。其次,以重庆白沙沱长江特大桥为依托,分析了桥梁施工的特点和风险控制的需求,提出了包括项目的建设规模、气候环境、水文地质、地形地貌、桥位特征及施工工艺成熟度等桥梁整体风险评价指标,运用专家赋权法对重庆白沙沱长江特大桥的施工风险进行了整体评价。根据评价结果,采取了包括风险回避等在内的风险控制技术。最后,分别针对白沙沱长江特大桥主桥3撑墩、施工便线和其它临近(跨越)既有线的结构物具有紧邻铁路、受既有线影响大、施工难度大的特点,提出了相应的施工安全控制措施。其中主桥3#墩的施工安全控制技术主要有：从水下爆破技术、爆破检测以及基础施工风险评估三个方面；受既有线影响的施工便线的施工安全控制技术包括：临近既有线的爆破施工的检查与安全防护、合理拟定施工便线过渡段施工方案及临近营业线路结构施工安全风险评估等。重庆白沙沱长江特大桥所进行的施工风险评价与控制技术研究,完善和丰富了受既有线影响的桥梁施工风险辨识、评价及控制技术理论,同时为受既有线影响的桥梁施工安全风险的有效控制与管理提供了借鉴。
[Abstract]:The bridge affected by the existing line should not only meet the operational safety of the existing line, but also ensure the construction safety and progress of the bridge. In the construction of the bridge, it is difficult to protect and remove the existing railway line, and the terrain conditions are complex. Leapfrogging constraints and many other factors. It is because of the comprehensive restriction of these characteristics and factors that there are a lot of safety risk problems in the construction process of the bridge affected by the existing railway lines. In engineering practice, the control of these safety risk problems is still very weak. It is of great theoretical significance and practical value to analyze, evaluate and control the construction safety risk of the bridge affected by the existing railway line systematically so as to minimize the construction safety risk and reach the construction goal of the project. Firstly, the basic concept and essence of risk, the basic method of risk identification and evaluation, and the basic method and theory of risk control are summarized, and the basic content of risk control of bridge construction is determined. Secondly, on the basis of Chongqing Baisatuo Yangtze River Bridge, the characteristics of bridge construction and the demand of risk control are analyzed, and the construction scale, climate and environment, hydrogeology, topography and geomorphology of the project are put forward. In this paper, the construction risk of Chongqing Baisatuo Yangtze River Bridge is evaluated by expert weighting method, such as bridge location characteristics and construction technology maturity. According to the evaluation results, risk control techniques including risk avoidance are adopted. Finally, in view of the main bridge pier 3 of Baisatuo Yangtze River Bridge, the construction of the convenient line and other structures adjacent to (across) the existing railway line have the characteristics of close proximity to the railway, which is greatly affected by the existing line and has great difficulty in construction. The corresponding construction safety control measures are put forward. The construction safety control techniques of pier 3 of the main bridge are mainly as follows: underwater blasting technology, blasting detection and risk assessment of foundation construction; The construction safety control technology of the construction line affected by the existing line includes the inspection and safety protection of the blasting construction near the existing line, the reasonable formulation of the construction plan of the transition section of the construction line and the safety risk assessment of the construction of the adjacent business line structure, and so on. The research on construction risk assessment and control technology of Chongqing Baisatuo Yangtze River Bridge has perfected and enriched the theory of bridge construction risk identification, evaluation and control technology affected by the existing line. At the same time, it provides a reference for the effective control and management of the bridge construction safety risk affected by the existing line.
【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】：U445.1

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