波形钢腹板小箱梁结构设计及顶推施工技术研究

发布时间：2018-01-10 03:02

本文关键词：波形钢腹板小箱梁结构设计及顶推施工技术研究　出处：《华东交通大学》2014年硕士论文　论文类型：学位论文

【摘要】：江西吉安深圳大桥跨越井吉铁路干线，原设计跨径50+40+40=130m PC简支T梁，复测后发现原墩位正下方80m处有大量串珠式溶洞，为避开溶洞集中区，，保护铁路安全，并在铁路规定的3小时运行间隙内完成施工，将原设计跨径改为61+8+61m，结构选用波形钢腹板组合小箱梁，施工方法采用分条分块组拼、钓鱼法辅助顶推施工新工艺。本文主要做以下几点研究工作： (1)总结波形钢腹板的结构特性、设计理念；以国内外实际工程，对波形钢腹板PC组合桥与传统PC梁桥进行经济性对比分析； (2)进一步分析波形钢腹板梁桥现阶段的施工方法；利用波形钢腹板可用作顶推施工钢导梁，又可作为箱梁成桥腹板，说明波形钢腹板组合桥使用顶推法施工的优越性；分析分条分块组拼，不设临时墩、用钓鱼法工艺辅助顶推施工的可行性； (3)对临时塔架施工阶段稳定性及屈曲性能进行分析，并与未采用临时塔架及拉索拉力作用进行对比分析，以验证临时塔架结构方案的有效性； (4)对顶推施工阶段顶底板混凝土应力、顶推施工过程波形钢腹板剪应力、施工阶段挠度进行分析，以验证本文所提新思路、新方法的可靠性； (5)对成桥运营阶段的安全性能进行验算和分析，以验证此类跨径等高波形钢腹板组合连续梁桥的成桥运营安全性，为此类跨径桥梁设计提供理论依据；江西吉安深圳大桥跨铁路桥现正在按照波形钢腹板小箱梁结构、分条分块组拼、钓鱼法辅助顶推法进行工程设计及施工；通过本文对新结构、新工艺的研究，也为类似桥梁的设计和施工提供理论支持及技术参考。
[Abstract]:Ji'an Shenzhen Bridge in Jiangxi Province is designed to span 50 4040130m PC simply supported T beam across the main line of Jingji Railway. After re-survey, it is found that there are a large number of beaded caverns at 80m below the original pier. In order to avoid the concentrated area of karst cave, to protect railway safety, and to complete the construction within 3 hours of running gap stipulated by railway, the original design span is changed to 61.8 61m.The structure is composed of small box girder with corrugated steel webs. The construction method is divided into strips and blocks, and the fishing method is used to assist the new technology of pushing construction. In this paper, the following research work is done: 1) summing up the structural characteristics and design concept of corrugated steel web, comparing and analyzing the economy of PC composite bridge with corrugated steel web and traditional PC beam bridge with the practical engineering at home and abroad; 2) further analyzing the construction method of corrugated steel web girder bridge at the present stage; The use of corrugated steel web plate can be used as steel guide beam for jacking construction, and can also be used as web plate for box girder bridge, which shows the superiority of using pushing method in construction of composite bridge with corrugated steel web plate. The feasibility of using fishing technique to assist pushing construction without temporary pier is analyzed. (3) the stability and buckling performance of temporary tower during construction are analyzed, and compared with that of temporary tower and cable tension, to verify the effectiveness of temporary tower structure. In order to verify the reliability of the new ideas and methods proposed in this paper, the concrete stress of the top and bottom slab, the shear stress of the corrugated steel web during the pushing construction process and the deflection during the construction phase are analyzed. 5) checking and analyzing the safety performance of the bridge in operation stage, in order to verify the operation safety of this kind of continuous girder bridge with steel webs, which provides the theoretical basis for the design of this kind of span bridge. The cross railway bridge of Ji'an Shenzhen Bridge in Jiangxi Province is being designed and constructed according to the small box girder structure of corrugated steel webs, which is divided into strips and blocks, and supported by phishing method. Through the study of new structure and new technology, this paper also provides theoretical support and technical reference for the design and construction of similar bridges.
【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】：U442.5;U445.4

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