小半径大坡度钢箱连续梁桥顶推施工监控技术研究
发布时间：2019-04-26 12:10
【摘要】：随着我国交通事业的快速推进及高等级道路的网格化发展,各类立交工程也日益增多,其中有不少是在既有道路的基础上修建立交桥,这就产生了大量的跨线匝道桥,这类匝道桥大多为弯桥、坡桥。同时,由于顶推施工具有对既有道路的交通影响小,对施工场地的要求低等特点,在跨线桥梁施工中被越来越多的采用。因此,对具有弯、坡性质的桥梁顶推施工有关问题的研究工作就存在着现实的需求。重庆市黄桷湾立交工程F匝道桥顶推项目,即为典型的采用顶推施工的小半径、大纵坡钢箱梁跨线工程。本文以此项目为依托,研究此类桥梁在顶推工程中梁体的整体及局部受力特点,分析小半径、大纵坡对钢箱梁顶推及其空间形态的影响,以及等高梁预拱度设置对顶推施工的影响,并研究弯坡桥顶推施工监控的难点及解决的关键技术。本文主要工作及结论包括:①运用midas计算软件建立钢箱梁的受力分析模型,计算分析了钢箱梁所受的支反力、钢箱梁顶推过程中的竖向挠度和钢箱梁应力等在不同阶段的变化规律;同时,运用混合单元法以板壳单元建立了钢箱梁的局部模型,分析了顶推过程中钢箱梁的局部受力,评价了钢箱梁在顶推过程中的受力安全性,并根据应力的分布,得出梁体的弯曲和悬臂段的延伸都不利于梁体的局部受力的结论;建立临时支承体系的受力分析模型,并根据钢箱梁的支反力,计算分析了临时支承体系在顶推过程中结构的受力安全。②分析了小半径、大纵坡对钢箱梁顶推施工的影响:研究了桥梁纵坡变化对顶推力的影响,提出了大纵坡桥梁顶推防滑移的安全措施;分析了桥梁曲率半径对顶推过程中钢箱梁横向和纵向抗倾覆稳定性的影响;结合黄桷湾立交F匝道工程实际,计算分析了小半径、大纵坡钢箱梁节段不同拼装方案下的空间形态,研究了纵坡、曲率影响梁体空间形态的机理,并进一步探讨了弯、坡桥空间形态的设计方法。③分析了等高梁预拱度的设置对顶推施工结构受力的影响,包括对顶推力的影响,对钢箱梁受力的影响,对临时墩受力的影响,对钢箱梁与滑道不均匀接触的影响,及对钢箱梁竖向挠度的影响等,对这些影响进行了评估,并通过对比提出了使用带橡胶垫板的滑道的工程措施以应对这些影响。④分析了小半径、大纵坡的钢箱梁跨线顶推施工监控的特点、难点,提出了顶推施工监控中钢箱梁变形量和横向偏移量监测评定的方法,并阐述了黄桷湾立交F匝道钢箱梁顶推施工监控的工程实践。
[Abstract]:With the rapid development of transportation in China and the grid development of high-grade roads, all kinds of interchange projects are also increasing day by day. Many of them build overpasses on the basis of existing roads, which leads to a large number of cross-line ramp bridges. Most of these ramp bridges are curved bridges, slope bridges. At the same time, the pushing construction is more and more used in the construction of cross-line bridges due to its small influence on the traffic of existing roads and low requirements on the construction site. Therefore, there is a realistic demand for the research of bridge jacking construction with bending and slope properties. The F-ramp bridge jacking project of Chongqing Huangjuewan interchange project is a typical cross-line project of steel box girder with small radius and large longitudinal slope. On the basis of this project, this paper studies the whole and local stress characteristics of this kind of bridge in the push-up project, and analyzes the influence of small radius and large longitudinal slope on the steel box girder jacking and its spatial shape. The influence of pre-camber setting of equal-height beam on push-up construction is also studied, and the difficulties and key techniques to monitor and control the push-up construction of curved slope bridge are studied. The main work and conclusions of this paper are as follows: (1) the stress analysis model of steel box girder is established by using midas software, and the supporting force of steel box girder is calculated and analyzed. The variation law of vertical deflection and stress of steel box girder in different stages in the process of pushing steel box girder; At the same time, the local model of the steel box girder is established by using the mixed element method. The local stress of the steel box girder in the process of pushing is analyzed, and the stress safety of the steel box girder is evaluated according to the distribution of stress, and the force safety of the steel box girder is evaluated according to the stress distribution. It is concluded that the bending of the beam and the extension of the cantilever are not conducive to the local force of the beam. The stress analysis model of the temporary support system is established, and according to the support force of the steel box girder, the force safety of the temporary support system during the push-up process is calculated and analyzed. (2) the small radius is analyzed. The influence of large longitudinal slope on steel box girder jacking construction: the influence of bridge longitudinal slope change on top thrust is studied, and the safety measures to prevent sliding of bridge roof with large longitudinal slope are put forward. The influence of the curvature radius of the bridge on the lateral and longitudinal anti-overturning stability of the steel box girder during the push-up process is analyzed. Combined with the practice of Huangjuewan interchange F ramp project, the spatial morphology of steel box girder segments with small radius and large longitudinal slope is calculated and analyzed, and the mechanism of the influence of longitudinal slope and curvature on the spatial shape of beam body is studied, and the bending is further discussed. The design method of space shape of slope bridge. 3. The influence of pre-camber of equal-height beam on the force of jacking construction structure is analyzed, including the influence of pushing force, the influence on the force of steel box girder, and the influence on the force of temporary pier. The influence of non-uniform contact between steel box girder and slide and the vertical deflection of steel box girder are evaluated. The engineering measures to deal with these effects are put forward by comparison. (4) the characteristics and difficulties of pushing construction monitoring of steel box girder with small radius and large longitudinal slope are analyzed. The monitoring and evaluating method of steel box girder deformation and lateral offset in pushing construction monitoring is put forward, and the engineering practice of steel box girder pushing construction monitoring on F ramp of Huangjuewan interchange is expounded.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.462
本文编号：2466053
[Abstract]:With the rapid development of transportation in China and the grid development of high-grade roads, all kinds of interchange projects are also increasing day by day. Many of them build overpasses on the basis of existing roads, which leads to a large number of cross-line ramp bridges. Most of these ramp bridges are curved bridges, slope bridges. At the same time, the pushing construction is more and more used in the construction of cross-line bridges due to its small influence on the traffic of existing roads and low requirements on the construction site. Therefore, there is a realistic demand for the research of bridge jacking construction with bending and slope properties. The F-ramp bridge jacking project of Chongqing Huangjuewan interchange project is a typical cross-line project of steel box girder with small radius and large longitudinal slope. On the basis of this project, this paper studies the whole and local stress characteristics of this kind of bridge in the push-up project, and analyzes the influence of small radius and large longitudinal slope on the steel box girder jacking and its spatial shape. The influence of pre-camber setting of equal-height beam on push-up construction is also studied, and the difficulties and key techniques to monitor and control the push-up construction of curved slope bridge are studied. The main work and conclusions of this paper are as follows: (1) the stress analysis model of steel box girder is established by using midas software, and the supporting force of steel box girder is calculated and analyzed. The variation law of vertical deflection and stress of steel box girder in different stages in the process of pushing steel box girder; At the same time, the local model of the steel box girder is established by using the mixed element method. The local stress of the steel box girder in the process of pushing is analyzed, and the stress safety of the steel box girder is evaluated according to the distribution of stress, and the force safety of the steel box girder is evaluated according to the stress distribution. It is concluded that the bending of the beam and the extension of the cantilever are not conducive to the local force of the beam. The stress analysis model of the temporary support system is established, and according to the support force of the steel box girder, the force safety of the temporary support system during the push-up process is calculated and analyzed. (2) the small radius is analyzed. The influence of large longitudinal slope on steel box girder jacking construction: the influence of bridge longitudinal slope change on top thrust is studied, and the safety measures to prevent sliding of bridge roof with large longitudinal slope are put forward. The influence of the curvature radius of the bridge on the lateral and longitudinal anti-overturning stability of the steel box girder during the push-up process is analyzed. Combined with the practice of Huangjuewan interchange F ramp project, the spatial morphology of steel box girder segments with small radius and large longitudinal slope is calculated and analyzed, and the mechanism of the influence of longitudinal slope and curvature on the spatial shape of beam body is studied, and the bending is further discussed. The design method of space shape of slope bridge. 3. The influence of pre-camber of equal-height beam on the force of jacking construction structure is analyzed, including the influence of pushing force, the influence on the force of steel box girder, and the influence on the force of temporary pier. The influence of non-uniform contact between steel box girder and slide and the vertical deflection of steel box girder are evaluated. The engineering measures to deal with these effects are put forward by comparison. (4) the characteristics and difficulties of pushing construction monitoring of steel box girder with small radius and large longitudinal slope are analyzed. The monitoring and evaluating method of steel box girder deformation and lateral offset in pushing construction monitoring is put forward, and the engineering practice of steel box girder pushing construction monitoring on F ramp of Huangjuewan interchange is expounded.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.462
【参考文献】
相关硕士学位论文 前1条
1 张陕锋;正交异性板扁平钢箱梁若干问题研究[D];东南大学;2006年
，本文编号：2466053
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