德溪大桥施工过程关键技术分析

发布时间：2018-12-09 16:29

【摘要】：现有的以两种或两种以上基本结构组合而成的体系被称之为组合体系结构,它的力学性能和材料指标较同等设计条件的单一结构体系而言表现更优,单一体系工程适用性往往逊色于组合体系结构。拱式桥是由拱肋、吊杆(或立柱)、系杆、行车道梁(板)、桥面系等组合而成的体系,当设计人员把这些基本结构设计成由不同的组合形式来共同承担荷载时,就可以形成种类各异的拱式组合体系桥。随着社会的发展,目前拱式组合体系桥梁的施工形式呈多样化。本文以贵州省毕节市德溪大桥为工程背景,对其施工过程中的关键技术及结构稳定性方面进行研究分析,为类似拱式组合结构的建设提供技术参考。主要研究内容如下:(1)考虑到德溪大桥自身组合结构的特点,三角刚架区域施工在施工过程中是全桥最为关键之处,本文第一部分首先对三角刚架的施工过程进行分析,并对施工中的支架进行静力分析,最后通过与现场实测数据对比,证明这种施工方法的安全可靠。(2)德溪大桥主拱施工采用的是先竖转再整体提升的施工方法,此种方法对提升塔架的稳定安全具有严格要求。因此本文对提升塔架的稳定性进行了详细的计算分析,综合考虑了风荷载对其稳定性的影响,并提出了优化方法,计算验证了该优化方法的可行性。(3)在下承式拱桥中吊杆是主要的传力构件,吊杆在桥梁运营阶段的长度将直接影响到桥梁的线性及桥梁结构的受力。本文采用施工阶段无应力状态法计算了德溪大桥主拱吊杆的无应力长度,并且将计算结果成功应用于实际施工过程中,并取得较好的效果。
[Abstract]:Existing systems composed of two or more basic structures are called composite structures, and their mechanical properties and material indexes are better than a single structural system with the same design conditions. The applicability of a single system engineering is often inferior to that of a composite architecture. An arch bridge is a system composed of arch ribs, suspenders (or columns), tie bars, carriageway beams (slabs), deck systems, etc., when designers design these basic structures to share loads in different combinations. A variety of arch composite system bridges can be formed. With the development of society, the construction form of arch composite system bridge is diversified. Taking Dexi Bridge in Bijie City, Guizhou Province as the engineering background, this paper studies and analyzes the key technology and structural stability in the construction process, and provides a technical reference for the construction of similar arched composite structures. The main research contents are as follows: (1) considering the characteristics of the composite structure of Dexi Bridge, the construction of triangle rigid frame is the most important part of the whole bridge during the construction process. In the first part of this paper, the construction process of the triangle frame is analyzed. And the static analysis of the support in construction is carried out. Finally, the safety and reliability of this construction method is proved by comparing with the field measured data. (2) the construction method of the main arch of Dexi Bridge is the first vertical rotation and then the whole lifting. This method has strict requirements for the stability and safety of tower. Therefore, the stability of the lifting tower is calculated and analyzed in detail, and the influence of wind load on the stability is considered comprehensively, and the optimization method is put forward. The calculation verifies the feasibility of the optimization method. (3) in the through arch bridge, the suspension rod is the main force transfer component, and the length of the suspension rod in the bridge operation stage will directly affect the bridge linearity and the force of the bridge structure. In this paper, the unstressed length of the main arch suspender of Dexi Bridge is calculated by using the method of non-stress state in construction stage, and the result is successfully applied to the actual construction process, and good results are obtained.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.4

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