兰青线湟水河2号桥桥墩基础加固研究
发布时间：2018-11-17 20:35
【摘要】：我国经济的腾飞和基础设施建设是紧密配合的,桥梁事业发展也是借助于这种形势,承担着保持交通畅通的重要任务。但是一些桥梁修建于上个世纪六七十年代,服役期已经达到50年,当时的规范要求,环境条件和现在相比已经有了巨大的变化,一是速度的变化,我国铁路经历了几次大的提速；二是火车的轴重变大,运输更加频繁,显然大多数桥梁不能够推倒重建,只能加固后评估合格继续使用,所以铁路桥梁的加固和维修成为了一种常态。本文依托兰青线K36+879湟水河2#桥加固项目,该桥位于兰州市红古区河嘴村西侧,湟水河下游,是兰青铁路上行线上跨越湟水河的桥梁之一。墩台基础冲刷检测中发现了桥墩局部冲刷严重,部分桥墩河床地面线和桥墩基底距离小于安全距离；在桥梁状态检测中发现部分桥墩最大振幅超出最大振幅推断值,需要进行维修加固。根据兰青线K36+879湟水河2#桥的病害情况,依据国内外对桥梁墩台局部冲刷的研究,讨论了不同桥梁的的水毁破坏的典型案例,进行了多种因素导致桥梁墩台基础浅基冲刷的研究；同时也探讨了桥梁的加固原则和加固方法,依照实际情况,找到合理的加固方案。文章根据铁路桥规对桥梁加固前后分别用不同工况下进行了结构的静力计算、分析和比较,提出了针对桥梁病害的加固方案,对加固前后桥墩的检算,以及加固后桥梁动力特性实测梁体自振频率、挠度和桥墩的横向振幅都是满足规范要求。说明本文研究方法是可信的,加固方案也是切实可行的。通过对该项目的研究,对于兰青线K36+879湟水河2#桥病害的整治,取得了良好的社会效益和明显的经济效益。本文对兰青线K6+879湟水河2#桥加固工程运用已有规范进行静力方面的检算分析,实际检测来分析桥梁的动力特征,以此来判断桥梁的运行状态安全与否,这为其它钢筋混凝土简支梁铁路桥梁的加固提高了参考,也为旧桥的桥梁墩台基底状况对稳定的影响提供了一定依据。
[Abstract]:The rapid development of China's economy and the construction of infrastructure are closely coordinated, and the development of the bridge undertaking undertakes the important task of keeping the traffic unimpeded by virtue of this situation. However, some bridges were built in the 1960s and 1970s, and the duration of service has reached 50 years. At that time, the standard requirements and environmental conditions have changed greatly compared with the present. One is the change in speed. The railway of our country has experienced several times of increasing speed; Second, the axle load of the train becomes larger and the transportation is more frequent. Obviously, most bridges can not be pushed down and rebuilt, but can only be evaluated after reinforcement and continue to be used, so the reinforcement and maintenance of railway bridges has become a normal condition. This paper relies on the project of strengthening the bridge of the Lanqing Line K36879 Huangshui River, which is located at the west side of Hezui Village, Honggui District, Lanzhou City, and the lower reaches of the Huangshui River. It is one of the bridges across the Huangshui River on the upstream line of the Lanqing Railway. In the scour detection of pier and abutment foundation, it is found that the local scour of the pier is serious, and the distance between the ground line of the riverbed and the base of the pier is less than the safe distance. In the detection of bridge state, it is found that the maximum amplitude of some piers exceeds the maximum amplitude inferred value, so it is necessary to carry out maintenance and reinforcement. According to the disease situation of K36879 Huangshui River Bridge in Lanqing Line, and based on the research on local scour of bridge pier and abutment at home and abroad, the typical cases of water damage of different bridges are discussed. The study on the erosion of shallow foundation of bridge pier and abutment caused by many factors is carried out. At the same time, the reinforcement principle and method of the bridge are discussed, and the reasonable reinforcement scheme is found according to the actual situation. According to the static calculation, analysis and comparison of the bridge before and after reinforcement by the railway bridge rules, the paper puts forward the reinforcement scheme for the bridge diseases, and checks and calculates the piers before and after reinforcement. The measured natural vibration frequency deflection and lateral amplitude of bridge pier meet the requirements of the code. It shows that the research method in this paper is credible and the reinforcement scheme is feasible. Through the research of this project, the disease treatment of the bridge of K36879 Huangshuihe River in Lanqing Line has obtained good social benefit and obvious economic benefit. In this paper, the dynamic characteristics of the bridge are analyzed by using the existing codes in the reinforcement project of the K6879 Huangshuihe River Bridge on the Lanqing Line, and the dynamic characteristics of the bridge are analyzed by the actual inspection, so as to judge the safety or not of the bridge's running state. This provides a reference for the reinforcement of other reinforced concrete simply supported railway bridges, and also provides a certain basis for the influence of the foundation condition of the old bridge pier and abutment on the stability.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.72
本文编号：2338969
[Abstract]:The rapid development of China's economy and the construction of infrastructure are closely coordinated, and the development of the bridge undertaking undertakes the important task of keeping the traffic unimpeded by virtue of this situation. However, some bridges were built in the 1960s and 1970s, and the duration of service has reached 50 years. At that time, the standard requirements and environmental conditions have changed greatly compared with the present. One is the change in speed. The railway of our country has experienced several times of increasing speed; Second, the axle load of the train becomes larger and the transportation is more frequent. Obviously, most bridges can not be pushed down and rebuilt, but can only be evaluated after reinforcement and continue to be used, so the reinforcement and maintenance of railway bridges has become a normal condition. This paper relies on the project of strengthening the bridge of the Lanqing Line K36879 Huangshui River, which is located at the west side of Hezui Village, Honggui District, Lanzhou City, and the lower reaches of the Huangshui River. It is one of the bridges across the Huangshui River on the upstream line of the Lanqing Railway. In the scour detection of pier and abutment foundation, it is found that the local scour of the pier is serious, and the distance between the ground line of the riverbed and the base of the pier is less than the safe distance. In the detection of bridge state, it is found that the maximum amplitude of some piers exceeds the maximum amplitude inferred value, so it is necessary to carry out maintenance and reinforcement. According to the disease situation of K36879 Huangshui River Bridge in Lanqing Line, and based on the research on local scour of bridge pier and abutment at home and abroad, the typical cases of water damage of different bridges are discussed. The study on the erosion of shallow foundation of bridge pier and abutment caused by many factors is carried out. At the same time, the reinforcement principle and method of the bridge are discussed, and the reasonable reinforcement scheme is found according to the actual situation. According to the static calculation, analysis and comparison of the bridge before and after reinforcement by the railway bridge rules, the paper puts forward the reinforcement scheme for the bridge diseases, and checks and calculates the piers before and after reinforcement. The measured natural vibration frequency deflection and lateral amplitude of bridge pier meet the requirements of the code. It shows that the research method in this paper is credible and the reinforcement scheme is feasible. Through the research of this project, the disease treatment of the bridge of K36879 Huangshuihe River in Lanqing Line has obtained good social benefit and obvious economic benefit. In this paper, the dynamic characteristics of the bridge are analyzed by using the existing codes in the reinforcement project of the K6879 Huangshuihe River Bridge on the Lanqing Line, and the dynamic characteristics of the bridge are analyzed by the actual inspection, so as to judge the safety or not of the bridge's running state. This provides a reference for the reinforcement of other reinforced concrete simply supported railway bridges, and also provides a certain basis for the influence of the foundation condition of the old bridge pier and abutment on the stability.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.72
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