钢管混凝土拱桥吊杆破坏机理及更换研究

发布时间：2018-11-18 13:03

【摘要】：对于桥梁建设来说，每一种桥型的发展都是桥梁界的一场革命。钢管混凝土拱桥一出现，就得到了桥梁界的广泛认可和偏爱。钢管与混凝土的结合，把两种材料的优势发挥到了极致。钢管混凝土拱肋的施工方便，省去了以往钢筋混凝土拱肋施工时要搭设支架和模板这道工序。钢管混凝土自重轻、施工方便、施工周期短等等这些优点都确立了它在桥梁界不可撼动的地位。钢管混凝土拱桥在大、中跨径桥梁中很有竞争力。尤其是在城市桥梁中，其外形美观、施工工期短等优点足以使它从各种桥型中脱颖而出成为优胜方案。随着转体施工的发展，钢管混凝土拱桥在跨越运输任务繁忙的既有线路、在山区跨越悬崖时，它都能发挥出其独特的优势，能够产生显著的社会效益和经济效益。随着钢管混凝土拱桥运营时间的增加，它的一些缺点也逐渐暴露出来，尤其是拱桥吊杆的破坏。拱桥吊杆的实际寿命远达不到设计的使用寿命，由于吊杆防护和外力的破坏等原因，使得吊杆过早的结束了寿命，而建造新桥的成本太高，为了节省资源，不得不对桥梁进行加固，更换破损的吊杆。因此，研究钢管混凝土拱桥吊杆的破坏和吊杆更换非常迫切。本文先对钢管混凝土拱桥吊杆破损原因进行分析，并提出了相应的解决措施。然后从吊杆更换施工技术入手，对背景工程项目101.4米中承式钢管混凝土拱桥吊杆更换施工方法、施工控制以及施工中的关键问题进行了详细讨论和研究。本文主要进行了以下工作：第一，对吊杆的破损机理进行深入分析，并提出相应的防护措施。第二，介绍了钢管混凝土拱桥吊杆更换施工方法，对背景工程吊杆更换施工方案、各项技术标准作出了详细的说明，提出了施工时需注意的事项，，保证背景工程项目吊杆更换的顺利进行。第三，根据背景工程的特点和施工步骤，进行了详细的施工过程有限元仿真计算。通过施工过程有限元仿真计算，对施工过程中桥面标高变化、吊杆索力变化进行了分析，研究了实际施工与有限元仿真模拟结果存在误差的原因，并对吊杆更换施工工作提出了建议和意见。我国在上世纪九十年代修建的钢管混凝土拱桥的吊杆破损问题越来越严重，很多桥由于吊杆的破坏必须对吊杆进行更换。我们应该看到，在这样的情况下，吊杆更换施工工艺对于确保交通运输的安全畅通有着明显的社会效益，拥有广阔的应用前景。
[Abstract]:For bridge construction, each kind of bridge development is a revolution in bridge field. As soon as concrete filled steel tubular arch bridge appears, it is widely recognized and favored by bridge circle. The combination of steel tube and concrete exerts the advantages of the two materials to the extreme. The construction of concrete-filled steel tube arch rib is convenient, which saves the working procedure of erecting support and formwork in the previous construction of reinforced concrete arch rib. The advantages of concrete filled steel tube (CFST), such as light weight, convenient construction and short construction period, have established its unshakable position in the bridge boundary. Concrete-filled steel tubular arch bridge is very competitive in large and medium span bridges. Especially in the city bridge, its appearance is beautiful, the construction period is short and so on. With the development of rotary construction, concrete filled steel tubular arch bridge is able to display its unique advantages in crossing the existing lines with heavy transportation tasks, and when crossing cliffs in mountainous areas, which can bring about remarkable social and economic benefits. With the increase of operation time of concrete-filled steel tubular arch bridge, some shortcomings are gradually exposed, especially the damage of arch bridge suspenders. The actual life of the arch bridge suspension is far from the designed service life. Because of the protection of the boom and the damage of the external force, the suspender ends its life prematurely, and the cost of building the new bridge is too high, in order to save resources, The bridge had to be strengthened and the damaged hanger replaced. Therefore, it is urgent to study the damage and replacement of suspenders of concrete-filled steel tubular arch bridge. In this paper, the causes of suspension failure of concrete-filled steel tubular arch bridge are analyzed, and the corresponding solutions are put forward. Then, starting with the construction technology of suspender replacement, the paper discusses and studies in detail the construction method, construction control and key problems in the construction of 101.4 m through steel tubular arch bridge in background engineering project. The main work of this paper is as follows: first, the damage mechanism of the boom is deeply analyzed, and the corresponding protective measures are put forward. Secondly, the paper introduces the construction method of suspender replacement of concrete-filled steel tube arch bridge, explains the construction scheme of suspender replacement in background engineering, each technical standard in detail, and puts forward the matters needing attention in construction. To ensure the smooth replacement of the suspender in the background engineering project. Thirdly, according to the characteristics and construction steps of the background engineering, the finite element simulation calculation of the construction process is carried out in detail. Through the finite element simulation calculation of the construction process, the variation of the bridge deck elevation and the cable force of the suspension rod during the construction process is analyzed, and the reasons for the error between the actual construction and the finite element simulation results are studied. Suggestions and suggestions are put forward for the replacement of suspenders. The damage problem of suspenders of concrete-filled steel tubular arch bridges built in 1990s in China is more and more serious. Many bridges must replace the suspenders because of the damage of suspenders. We should see that under such circumstances, the replacement construction technology of suspenders has obvious social benefits to ensure the safety and smooth transportation, and has a broad application prospect.
【学位授予单位】：华东交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.22;U445.7

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