预应力混凝土连续箱梁桥加固及施工监控方法研究

发布时间：2018-06-10 10:08

本文选题：桥梁检测 + 体外预应力加固　；参考：《青岛理工大学》2016年硕士论文

【摘要】：混凝土连续箱梁桥随着近几年的发展在国内外得到了广泛运用,其优点为:造型美观、安全可靠。桥梁在运营多年后,会出现多种病害,对桥梁加固的研究也成为一个热门的课题。随着桥梁加固,施工过程同时变得越发的复杂。所以,桥梁加固施工监控的重要性显得更加突出,加固需要进行结构仿真分析、施工监测、分析整理和有效地组织管理。施工监控可保证桥梁在加固后线形及受力状态基本符合设计要求,保证桥梁的质量和安全,在现代桥梁施工中具有重要作用。为了保证桥梁安全营运和尽可能延长其安全使用年限,应对桥梁进行质量鉴定与评估。所谓桥梁鉴定评估,就是对桥的整体及其组成部分进行考察、了解、检查、检测、分析。桥梁检测有时还需要通过相关试验,对其病害情况、损伤程度、病害与损伤原因、实有承载能力、功能以及能否正常运营等做出鉴定,给出明确结沦。同时,根据检测结果提出相应的措施及维修加固的建议,供业主决策。本文结合山东济宁京杭运河大桥的工程背景,通过加固方法比较提出针对该桥梁的加固方案。实施加固方案后,最后根据桥梁加固前后实际承载能力的差异,从而判断桥梁加固应用的效果。预应力混凝土连续箱梁桥体外预应力加固施工过程中会出现一些问题,为确保施工过程中的安全及成桥阶段的线形良好需对桥梁施工过程进行监控。结合山东济宁京杭运河大桥的加固施工监控情况,针对高程、应力、温度三方面实施测量控制,探讨了体外预应力加固施工监控情况。体外预应力加固技术是种十分有效的加固方法,桥梁后张法预应力体系体外预应力加固的原理是利用张拉预应力筋产生的内力来控制抵消截面处的部分以及全部恒、活载内力。其根本是对结构控制截面进行卸载。体外预应力加固能大幅改善调整原有结构的受力情况,提高承载力和抗裂性能,对桥墩、基础以及其它结构影响也很小,同时对桥梁交通影响不大,可节约维护成本。本文拟通过工程实例的介绍山东济宁京杭运河大桥的检测、体外预应力加固以及桥梁的加固施工监控。
[Abstract]:With the development of concrete continuous box girder bridge in recent years, it has been widely used at home and abroad, its advantages are: beautiful shape, safe and reliable. After many years of operation, there will be many diseases, so the study of bridge reinforcement has become a hot topic. As the bridge is strengthened, the construction process becomes more and more complex at the same time. Therefore, the importance of bridge strengthening construction monitoring is more prominent, reinforcement needs to carry out structural simulation analysis, construction monitoring, analysis and arrangement and effective organization and management. Construction monitoring can ensure that the alignment and force state of the bridge after reinforcement basically meet the design requirements, ensure the quality and safety of the bridge, and play an important role in the construction of modern bridges. In order to ensure the safe operation of the bridge and prolong its safe service life as far as possible, the quality appraisal and evaluation of the bridge should be carried out. Bridge appraisal is to inspect, understand, check, detect and analyze the whole bridge and its components. Bridge detection sometimes needs to pass relevant tests to identify the condition of the disease, the degree of damage, the disease and the cause of damage, the actual carrying capacity, the function and the normal operation of the bridge, and give a definite conclusion. At the same time, according to the test results, the corresponding measures and suggestions of maintenance and reinforcement are put forward for the decision of the owner. Based on the engineering background of Jining Beijing-Hangzhou Canal Bridge in Shandong Province, the reinforcement scheme of the bridge is put forward through comparison of reinforcement methods. Finally, according to the difference of actual bearing capacity before and after reinforcement, the effect of bridge reinforcement is judged. There will be some problems in the construction of prestressed concrete continuous box girder bridge during the process of external prestressing reinforcement. In order to ensure the safety of the construction process and the good alignment of the completed bridge stage, it is necessary to monitor the construction process of the bridge. Based on the monitoring of the reinforcement construction of Jinghang Canal Bridge in Jining, Shandong Province, this paper discusses the monitoring and control of external prestressing reinforcement construction according to the three aspects of height, stress and temperature. External prestressing reinforcement technique is a very effective reinforcement method. The principle of external prestressing reinforcement of post-bridge Zhang Fa prestressing system is to use the internal force generated by tensioning prestressed tendons to control some and all the dead and live load internal forces. It is basically to carry on the unloading to the control section of the structure. External prestressing can greatly improve the stress of the original structure, improve the bearing capacity and crack resistance, have little effect on the pier, foundation and other structures, but also have little impact on the bridge traffic and save the maintenance cost. This paper introduces the detection of Jinghang Canal Bridge in Jining, Shandong Province, the reinforcement of external prestressing force and the monitoring of the construction of the bridge.
【学位授予单位】：青岛理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U445

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