【作者】 李刚；

【导师】 宋一凡；

【作者基本信息】 长安大学 ， 建筑与土木工程， 2009， 硕士

【摘要】 随着交通事业的发展,诸如行车净空的加高、航道等级的提高、对路线指标、及路线与环境配合等方面要求日趋提高,有许多在役桥梁已不能满足日益增长的通行要求,产生了巨大的矛盾。在结构承载力满足的前提下,仅因为线形不满足要求就拆除重建,既会造成巨大的浪费,也会在社会上造成不良的影响。针对桥梁净空不足的现状,急需寻找一种科学、合理的改造方法,既满足桥下净空的要求,又能够使原有桥梁继续发挥作用,因此,桥梁顶升升高技术正是针对正在使用的旧桥进行的竖直方向抬升和改造的一种技术对策。本论文以顶升改造的康崖底连续刚构桥为依托工程,详细分析研究连续刚构桥顶升施工前、施工过程、施工后的上、下部结构仿真计算分析方法,分析研究结构各种工况下的受力工作状态,并提出了一些顶升施工方法和施工工艺等技术。本文具体采用了施工过程仿真分析方法,研究了顶升不同步性对上部结构承载力、支点反力的影响,讨论了顶升过程中原桥墩、临时墩荷载变化对承台、桩基内力的影响,提出了桥梁顶升施工方法及工艺。分析结果表明：顶升施工过程中,下部结构最不利主拉应力仅为1.15MPa,最大主压应力仅为4.72MPa,临时墩最不利水平变位仅为1.57mm,应力与变形均满足要求；但上部结构承载力不足,需采取体外预应力加固补强措施。研究及应用结果表明,桥梁顶升施工技术工期短、造价低,不影响桥下通行,可以明显改善桥梁使用性能。希望起到“抛砖引玉”的作用,对中国公路桥梁的技术改造提供有益的借鉴。更多还原

【Abstract】 With the development of transport, such as road clearance height of the navigation channel to improve the level of line targets, and routes with the environment, such as the growing demand to increase, there are many bridges have been in service can not meet the increasing traffic demands, resulting in a huge contradiction. Structural capacity to meet the prerequisite, because the line does not meet the requirements only on the demolition and reconstruction, not only will cause a huge waste, but also in the community have any adverse effect.Under-bridge headroom for the status quo, an urgent need to find a scientific and rational method of transformation to meet the requirements of clearance under the bridge, but also can continue to play a role in the original bridge, the bridge is the top or high technology is aimed at old bridge used to carry out the direction of the vertical uplift and transformation of a technical countermeasures.In this paper, the transformation to the top of the Culture and continuous rigid frame bridge Kangyadi based on engineering, detailed analysis of continuous rigid frame bridge jacking pre-construction, construction process, after construction, the lower part of the structure of simulation analysis methods, analysis of the structure of various conditions of the working force, and made a number of top-up construction methods and technologies such as construction technology.The reforming process was studied with simulation analysis to study the effect of nonsynchronous rising on the bearing capability of the superstructure and the reaction force at the support, and the influence of the original piers and temporary piers on the internal force of the pile cap. The elevation method, procedure as well as its monitoring were presented. It was found that during the elevation period, the maximal principal tension stressis 1.15 MPa, the principal compression stress is 4.72MPa, and the maximal horizontal displacement of the temporary pier is 1.57 mm. So the bearing capacity of the superstructure is insufficient, it needs to be strengthened by external tendon method. The application indicates that the elevation technology can obviously improves the performance of the bridge with the advantage of short construction, low cost and non-interfering of traffic. Want to play the role of "start" of the role of the technological transformation of China Road Bridge provide useful lessons.更多还原