中牟县广惠街清源大桥检测与维修改造技术研究

发布时间：2018-01-13 23:26

本文关键词：中牟县广惠街清源大桥检测与维修改造技术研究　出处：《郑州大学》2014年硕士论文　论文类型：学位论文

【摘要】：近年来我国交通运输量快速增添,成千上万的老路旧桥中很大一部分都已不能满足不断增长的交通量需求,特别是初期修建的桥梁,因为设计标准低,年久失修维护养护不足,很多都是超限运行,正在逐步成为危桥。随着路网改造、老路改建和道路升级,桥梁在长期的运营过程中不可避免的出现各种结构损伤,自然环境的变化,车辆密度的大幅上升,重型车辆日渐增多,这些因素都导致了桥梁承载能力和耐久性的降低,这些损害都是不可扭转的,在运营中存在较大的安全隐患,这些危桥严重影响了交通运输的发展,这导致了一系列的问题,需要引起全社会的密切关注。本文以中牟县广惠街清源大桥为例,通过该桥外观检测发现行车道、墩顶均有裂缝,锚固区混凝土局部严重破损；部分梁板混凝土破损,板底有刮蹭、箍筋锈胀,板缝局部脱落,多处受渗水析碱；部分支座局部或完全脱空,部分支座轻度或较严重开裂,部分支座垫石局部破损开裂；墩台盖梁局部较严重渗水,有较严重的混凝土锈胀区；盖梁有竖向裂缝。静载试验中该桥测试跨在工况1-6荷载作用下,主要测试点的横向分布系数的实测与理论值偏差大,表明横向联系较差,空心板不能整体受力。动载试验中在工况7实测冲击系数大于理论值1.236,说明在不良路况情况下桥梁冲击系数会增加。根据以上试验结果分析桥梁受损的原因,研究桥梁维修改造方案。桥梁检测可用于评估旧桥的实际承载能力,为有效的设计和维修改造方案提供依据,希望本文能提供经验,为以后类似的工程有所帮助。
[Abstract]:In recent years, the traffic volume of our country increases rapidly, and a large part of the thousands of old old bridges can not meet the increasing demand of traffic volume, especially the bridge built in the early stage, because of the low design standard. Lack of maintenance and maintenance in years of disrepair, many of which are overrun, are gradually becoming dangerous bridges. With the road network transformation, old road reconstruction and road upgrading. Bridge in the long-term operation process inevitably appear a variety of structural damage, changes in the natural environment, vehicle density increased significantly, heavy vehicles are increasing day by day. These factors have led to the reduction of the bearing capacity and durability of the bridge, which are irrevocable, and there are large safety risks in operation. These dangerous bridges seriously affect the development of transportation. This led to a series of problems, which need the attention of the whole society. This paper takes Qingyuan Bridge of Guanghui Street in Zhongmou County as an example, through the inspection of the appearance of the bridge found the carriageway, pier roof have cracks. Serious local damage of concrete in Anchorage zone; Part of the beam and slab concrete is damaged, the bottom of the plate is scratched, the stirrups are rusty, the plate joints are partially shedded, and many places are subjected to water seepage and alkali evolution; Part of the bearing is partially or completely empty, part of the support is slightly or severely cracked, and some of the support cushion is partially damaged and cracked; The piers and abutment beams have serious local water seepage and serious concrete rust expansion zone. There are vertical cracks in the cover beam. In the static load test, the transverse distribution coefficient of the main test points deviates greatly from the theoretical value, which indicates that the transverse connection is poor. Hollow slabs can not be subjected to force as a whole. In dynamic load test, the measured impact coefficient is larger than the theoretical value of 1.236 under 7 working conditions. It shows that the impact coefficient of the bridge will increase under the condition of bad road condition. According to the above test results, the causes of the bridge damage are analyzed, and the bridge maintenance and reconstruction scheme is studied. The bridge detection can be used to evaluate the actual bearing capacity of the old bridge. In order to provide the basis for effective design and maintenance modification, I hope this paper can provide experience and help for similar projects in the future.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.7

【参考文献】