复杂水文地质条件下钢围堰施工技术研究

发布时间：2018-01-02 05:30

本文关键词：复杂水文地质条件下钢围堰施工技术研究　出处：《重庆交通大学》2016年硕士论文　论文类型：学位论文

【摘要】：钢围堰作为桥梁基础承台施工的一种临时结构物,目前已被广泛使用。使用钢围堰的目的主要是在围堰内进行承台和基础施工时,能挡住堰外的水和土,不致于涌入围堰内影响施工,当基础和墩台修筑出水面以后又能将其拆除。双壁钢围堰是桥梁基础深水施工广泛采用的一种挡水围堰。本文以某长江大桥为背景,对了该桥深水基础、承台的围堰施工技术做了详细的介绍。根据实际施工情况,阐述了双壁钢围堰的构造要素以及施工工艺。由于双壁钢围堰是大型的临时钢结构,且在深水中进行施工,其所处位置特殊,受力复杂,结构重要性等级高,因此需对钢围堰的各个构件强度在不同施工阶段进行仔细验算。文章结合钢围堰施工过程,共分为四个计算工况。围堰下沉就位,封底,抽水,承台浇筑时都需验算结构的强度;围堰在下沉后由于受到水流的冲刷作用,需要进行抗冲刷验算。钢围堰浇筑了封底混凝土后需对封底混凝土验算强度和抗浮。计算结果表明,钢围堰在各个施工阶段中相关的验算指标都能满足要求。承台混凝土是大体积混凝土,因此应对其施工方法尤其是温度控制应开展专门的研究,文章采用大型通用有限元软件ANSYS,对混凝土的温度应力进行计算,并根据结果合理地选择温控措施。本文还对钢围堰在施工过程中的监测技术和风险分析做了研究。钢围堰在施工和使用中不可能完全和设计的状态保持一致,因此应实时监测钢围堰的各种参数,并且由于施工环境的特殊性,很多不确定性的因素直接影响着施工的安全和质量,通过选择合理的监控手段,准确分析施工中存在的风险,并对风险进行分析,采取相应的处理措施,以确保钢围堰在施工过程中的安全性。
[Abstract]:Steel cofferdam as a temporary structure construction pile foundation of the bridge, has been widely used. The main purpose is to use the steel cofferdam for pile cap and foundation construction in the cofferdam, can block the weir outside of water and soil, not construction impact on the influx of cofferdam foundation and abutment, when after the build out of the water it can be removed. The double wall steel cofferdam is a water retaining cofferdam is widely used in deepwater bridge construction. This paper based on the background of a Yangtze River bridge, on the bridge deep water foundation, introduced the construction technology of the cofferdam cap. According to the actual construction situation, expounds the structural elements of the double wall steel cofferdam and the construction process. Because of double wall steel cofferdam is a temporary steel structure is large, and the construction in deep water, its special location, complex stress and structure importance level is high, so it is necessary to each component of the strength of steel cofferdam in different construction The stage was carefully checking. Combining with the steel cofferdam construction process is divided into four calculation conditions. Cofferdam sinking in the back cover, pumping, pouring pile caps are required to check the strength of the structure; after sinking due to Cofferdam in water erosion, the need for anti erosion checking. The steel cofferdam subsealing concrete after pouring on check the strength of subsealing concrete and anti floating. The calculation results show that the steel cofferdam in each construction stage of the checking index can meet the requirements of large volume concrete is concrete. Therefore, the construction method especially temperature control should be carried out specialized research, using the large finite element software ANSYS, calculate the stress of the temperature of concrete, and the reasonable selection of temperature control measures according to the results. This paper also makes a study of the steel cofferdam in the construction process of monitoring technology and risk analysis. In the application of steel cofferdam Construction and use can not keep consistent with the designed state completely, so various parameters real time monitoring of steel cofferdam, and because of the particularity of the construction environment, many uncertainty factors directly affect the construction safety and quality, through reasonable means of monitoring, accurate analysis of the risk existing in the construction, and the risk of analysis, take corresponding measures, to ensure the safety of steel cofferdam in the construction process.

【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U445.556

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