高原常年低温地区大跨连续梁施工质量控制技术研究

发布时间：2018-01-16 02:20

本文关键词：高原常年低温地区大跨连续梁施工质量控制技术研究　出处：《兰州交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：目前我国高速铁路建设蓬勃发展,各类大跨连续梁桥不断出现,特别是线路穿越山区河谷地段,连续刚构桥更是设计首选桥形,因为其具有更加适用于高墩大跨的需要,而且具有力学性能合理、线形更加美观、行车平顺舒适、施工方便等优点。为了满足连续刚构在悬臂施工过程中线形和内力设计要求,以及施工的安全可靠,必须要对该类桥进行施工监控,但是绝大多数桥梁所处位置海拔较低,气温较高,每日温差不大,施工质量易于控制。随着我国西部大开发战略的实施和桥梁技术的发展,很多的连续梁桥相继在高原寒冷地区出现,同时这些桥梁的建成将会使新建铁路缩短线路,节省投资。高寒地区高墩大跨连续刚构桥所处的环境影响和改变整桥的施工方案选择与实施,同时环境因素在增大桥梁施工难度的同时也增加了质量控制难点,该类地区此型桥梁可供设计和施工借鉴的资料及经验尚很缺乏,在设计施工中还存在着很多尚未明确的问题。本论文以兰州至乌鲁木齐第二双线甘青段大平羌沟大桥为工程背景,根据结构的力学性能,提出了合理的施工监控方案,建立了全面的监控系统。此外,根据大桥所位置高寒的自然环境条件,基于本次“高原常年低温地区大跨连续梁施工质量控制技术研究”课题,通过专家咨询、技术调研、理论分析、数值模拟、现场监测、现场试验等研究手段,在项目推进过程中逐步深入开展工作,取得了一系列的研究成果。这些成果在项目上的运用,使工程项目重难点得到解决,确保了项目安全、质量、工期及效益,为高原常年低温地区桥梁的推广应用提供了宝贵的经验,可为类似工程借鉴。本文主要围绕大平羌沟大桥的施工全过程,高墩脚手架设计研究、大桥蒸养暖棚设计研究、冬季施工温度场分析、桥梁合拢技术的研究以及高原常年低温环境下高墩大跨度连续刚构桥梁的施工监控技术研究。
[Abstract]:At present, the construction of high-speed railway in China is booming, and various kinds of long-span continuous beam bridges appear constantly, especially the continuous rigid frame bridge is the first choice in the design of continuous rigid frame bridge. Because it is more suitable for the needs of high pier and long span, and has reasonable mechanical properties, more beautiful line shape, smooth and comfortable driving. In order to meet the requirements of linear and internal force design of continuous rigid frame during cantilever construction and the safety and reliability of construction, it is necessary to monitor the construction of this kind of bridge. However, most of the bridges are located in low altitude, high temperature, small daily temperature difference, easy to control the quality of construction. With the implementation of the western development strategy and the development of bridge technology. Many continuous girder bridges have appeared in the cold areas of the plateau. At the same time, the construction of these bridges will shorten the lines of the new railway. Saving investment. The environmental impact of the continuous rigid frame bridge with high piers and long span in the alpine region and the selection and implementation of the whole bridge construction scheme are changed. At the same time, the environmental factors not only increase the difficulty of the bridge construction, but also increase the difficulty of quality control. This type of bridge in this kind of area can be used for reference in design and construction data and experience is still very lacking. There are still many problems in the design and construction. This paper takes the Daping Qiang Gou Bridge of the second double track from Lanzhou to Urumqi as the engineering background, according to the mechanical properties of the structure. A reasonable construction monitoring scheme is put forward and a comprehensive monitoring system is established. In addition, according to the natural conditions of the high and cold location of the bridge. Based on the subject of "study on quality control technology of long-span continuous beam construction in the perennial low temperature area of plateau", through expert consultation, technical investigation, theoretical analysis, numerical simulation, field monitoring, field test and other research means. In the process of advancing the project, a series of research results have been made. The application of these results in the project has solved the important and difficult problems of the project and ensured the safety and quality of the project. The construction period and benefit provide valuable experience for the promotion and application of bridges in the perennial low temperature area of the plateau and can be used for reference for similar projects. This paper mainly focuses on the whole construction process of Daping Qiang Gouge Bridge and the design of scaffolding of high piers. The study on the design of the steaming and heating shed of the bridge, the analysis of the temperature field of the construction in winter, the study of the bridge closure technology and the construction monitoring technology of the long-span continuous rigid frame bridge with high piers and large span under the perennial low temperature environment on the plateau.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.4

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