系杆拱桥施工关键技术优化研究

发布时间：2018-03-06 08:18

本文选题：减隔震　切入点：钢支架　出处：《长安大学》2014年硕士论文　论文类型：学位论文

【摘要】：本文以国内最宽、首次应用分隔式减隔震支撑技术的陕西省西安市秦汉大道灞河桥（系杆拱桥）为背景，对常用桥梁关键施工技术进行优化研究，具体研究措施和意义如下：鉴于近年来地震频发，工程领域越来越注重抗震设计，本桥采用减隔震体系(中墩采用双排铅芯橡胶支座与盆式橡胶支座组成分离式隔震系统，边墩采用粘滞流体阻尼器作为减震系统)并结合多种常用抗震措施，有效地减少了桥墩的断面尺寸，合理的降低了地震高烈度区桥梁的造价成本。采用迈达斯软件建立支架三维有限元模型进行空间分析、模拟设计验算，在传统的支架体系中加入稳定性强、互换性好、适应范围广的模数式钢支撑，形成施工中一套实用万能多变的钢支撑体系，大大的增加了支架体系的刚度、强度和稳定性，解决了跨径大、结构高、地形条件复杂的结构施工支架问题。通过自平衡技术承载力试验验证，得知后压浆桩基承载力比非后压浆桩基承载力提高"f38.1%，后压浆施工技术得到了肯定，后压浆桩基在降低桩长和桩径的情况下，有效的保证了桩基承载能力，也为一般桩基后期质量缺陷修复提供了技术借鉴和处理方法。大跨径预应力结构施工一直存在着穿束、张拉和压浆等技术难以控制的问题，本桥采用吊车、卷扬机配合人工穿束，二次张拉工艺确保张拉伸长值符合规范要求，通过对比试验，选择成品灌浆料代替常规水泥浆进行压浆，取得了良好的施工效果。在拱脚压注混凝土施工方面，该桥拱脚以下部分直接灌入混凝土，振捣棒振捣，拱脚两边以上部分只压注到第一根吊杆下，其它部位不压注，使钢拱自身重心降低，同时采用搭设钢管支架固定压注管道的施工方法有效保障了施工安全同时也保证了施工质量。施工中改变了原设计的三节段吊装方案，采用五节段加工、制作与吊装技术，圆满完成了施工，，取得在吊装重量、吊装跨度、吊装高度的大大提高的工程领域的大胆尝试经验，成为了在吊装施工作业领域的一大突破。
[Abstract]:In this paper, based on the widest in China and the first application of isolated isolation support technology, Qinhanda Bahe Bridge (tied arch bridge) in Xi'an City, Shaanxi Province, as the background, the key construction techniques of common bridges are optimized and studied. The specific research measures and significance are as follows:. In view of the frequent earthquakes in recent years, more and more attention has been paid to seismic design in the engineering field. The isolation system is adopted in this bridge. The isolation system is composed of double row lead rubber bearing and basin type rubber bearing in the middle pier. The side pier adopts viscous fluid damper as the shock absorber system) and combined with a variety of commonly used seismic measures effectively reduces the section size of the pier and reasonably reduces the cost of the bridge in the high seismic intensity area. The three-dimensional finite element model of the support was established by using Midas software to carry out spatial analysis, the simulation design was checked, and the modular steel support with strong stability, good interchangeability and wide adaptability was added to the traditional support system. A set of practical universal and changeable steel support system is formed in the construction, which greatly increases the stiffness, strength and stability of the support system, and solves the construction support problem of long span, high structure and complicated terrain conditions. Through self-balancing technology bearing capacity test, it is known that the bearing capacity of post-grouting pile foundation is higher than that of non-post-grouting pile foundation "f38.1. the construction technology of post-grouting pile is affirmed, and the post-grouting pile foundation can reduce the length and diameter of pile." It can effectively guarantee the bearing capacity of pile foundation, and also provide technical reference and treatment method for repairing the quality defects in the later stage of pile foundation. In the construction of long span prestressed structure, it is always difficult to control the technology of straining, tensioning and grouting, etc. The bridge adopts crane, hoist and artificial beam piercing, and the secondary tensioning technology ensures that the tensioning elongation value meets the requirements of the specifications. Through the contrast test, the finished grouting material was selected instead of the conventional cement slurry to press the slurry, and the good construction effect was obtained. In the construction of concrete under the arch foot, the concrete is poured directly below the arch foot of the bridge, and the vibrating rod is vibrated and vibrated. The above part of the arch foot is only pressed under the first suspender, and the other parts are not pressed, so that the center of gravity of the steel arch itself is reduced. At the same time, the construction method of fixed pressure injection pipe with steel pipe support is used to ensure the construction safety and the construction quality. In the construction, the original design of the three-segment hoisting scheme has been changed, and the five-section processing, manufacture and hoisting technology have been adopted, the construction has been successfully completed, and the hoisting weight and the hoisting span have been obtained. The bold attempt experience in the field of hoisting has become a breakthrough in the field of hoisting construction.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.4;U448.225

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