【摘要】：隨著“一帶一路”戰(zhàn)略驅(qū)動的持續(xù)推進,列車時速行車密度的提高,對列車線路的使用需求日益增大。鑒于此,平交改立交的方式愈加迫切。而大跨度框架橋所占比重越來越大,為滿足大跨度框架橋剛度的要求則需加厚結(jié)構(gòu)斷面,從而增加結(jié)構(gòu)自重和頂力,施工難度和工程造價大大增加,受力狀況變得比較復雜,施工中影響因素更多。因此,如何減少對既有線路的行車影響,使框架橋快速、準確就位,以及解決架空、頂進過程中出現(xiàn)的各種問題,減少施工中對框架橋力學條件的不利影響,成為框架橋施工控制中迫切需要解決的問題。本文依托南水北調(diào)中線總干渠焦枝線平頂山西鐵路暗渠工程為背景,采用一種特殊的結(jié)構(gòu)和施工工法來滿足本項目的要求,重點研究在既有鐵路多股道條件下深基坑大跨度架空頂進的結(jié)構(gòu)設計和施工工法。本文采用Midas GTS有限元軟件進行數(shù)值模擬計算,首先進行模型的建立,定義各種相關因素,并對邊界條件和荷載進行定義與施加。結(jié)合工程實例,通過有限元計算與實際監(jiān)測,分析不同工況下結(jié)構(gòu)的位移與應力,目的在于論證本文所提出的工法的合理性與可行性。本文在借鑒常規(guī)架空頂進的基礎上,結(jié)合項目實際情況,化整為零,創(chuàng)造性地將單層結(jié)構(gòu)調(diào)整為分體式雙層結(jié)構(gòu);將成熟的單次架空頂進工法升級為兩次架空、分層多次頂進的新型工法,保證了項目的順利實施。本研究的內(nèi)容不但具有科研意義,還能用于指導工程實踐,對類似的工程起到很大的借鑒作用。
[Abstract]:With the continuous development of "Belt and Road" strategy driving and the increasing of train speed density, the demand for the use of train line is increasing day by day. In view of this, the way of level-to-turn interchange is becoming more and more urgent. However, the proportion of long-span frame bridge is more and more large. In order to meet the requirement of stiffness of long-span frame bridge, it is necessary to strengthen the section of the structure, thus increasing the weight and the top force of the structure, increasing the construction difficulty and engineering cost, and the stress condition becomes more complicated. There are more influential factors in construction. Therefore, how to reduce the impact on the existing lines, to make the frame bridge fast and accurate, and to solve the various problems in the process of overhead and jacking, and to reduce the negative impact on the mechanical conditions of the frame bridge during construction. It is an urgent problem to be solved in the construction control of frame bridge. In this paper, based on the project of the main trunk channel of the South-to-North Water transfer Project in Pingdingshan West Railway, a special structure and construction method is adopted to meet the requirements of the project. The structural design and construction method of large span overhead jacking in deep foundation pit under the condition of existing railway multi-track are studied. In this paper, the Midas GTS finite element software is used for numerical simulation. Firstly, the model is established, various relevant factors are defined, and the boundary conditions and loads are defined and applied. Combined with engineering examples, the displacement and stress of structures under different working conditions are analyzed through finite element calculation and actual monitoring. The purpose of this paper is to prove the rationality and feasibility of the engineering method proposed in this paper. On the basis of drawing lessons from the conventional overhead jacking and combining with the actual situation of the project, this paper creatively adjusts the single-layer structure to the split double-layer structure, and upgrades the mature single-stage overhead jacking method to the two-stage overhead structure. The new method of stratification and multiple jacking ensures the smooth implementation of the project. The content of this study not only has scientific research significance, but also can be used to guide engineering practice, which can be used for reference to similar projects.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U445.4

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