Construction Quality Research Plateau Span Continuous Beam Control Perennial Low-Temperature Region

At present, China booming high-speed railway construction, all kinds of large-span continuous beam bridge emerging, especially route through the mountain valleys, continuous rigid frame bridge is the preferred bridge design, because it has more suitable for long span of needs, but also has reasonable mechanical properties, linear more beautiful, comfortable and driving comfort, and easy construction. In order to meet the continuous rigid frame construction boom in the linear design requirements and internal forces, as well as the construction of safe and reliable, we must bridge construction monitoring this class, but the vast majority of low-lying bridge location, high temperatures, daily temperature difference, the construction quality is easy to control.With the rapid development of technology, the further implementation and bridges the western development strategy, more and more of continuous girder bridges will appear in the alpine region, while the completion of the bridge will make the new railway line shortened, saving investment. Alpine region long span continuous rigid frame bridge in which the environmental impact of the construction program and change the selection and implementation of the entire bridge, while environmental factors increase the difficulty of construction of the bridge also increases the difficulty of quality control, such regions this type of bridge design and construction of information and experience for reference still very lacking in design and construction, there are still a lot of questions not yet clear.In this paper, the second lane from Lanzhou to Urumqi, Gansu and Qinghai section Ohira Qiang ditch bridge engineering background, according to the mechanical performance of the structure, proposed a reasonable construction monitoring program, the establishment of a comprehensive monitoring system. Furthermore, according to the position of the bridge alpine natural conditions, based on this "plateau construction quality perennial low-temperature region span continuous beam control technology" project, through expert advice, technical research, theoretical analysis, numerical simulation, field monitoring, field test and other research tools, in the course of the project to promote the gradual deepening of the work, made a series of research results. These achievements in the use of the project on the heavy and difficult to make the project be resolved to ensure that the project safety, quality, duration and efficiency, promote the use of low-temperature plateau perennial area of the bridge provided valuable experience for similar projects. Paper focuses on steam raising hothouse Design Bridge Construction Ohira Qiang ditch the whole process of design research scaffolding high pier bridge construction in winter temperature field analysis, Bridge Closure technology research and highland perennial low-temperature environment of high pier and long span continuous rigid frame Research and bridge construction monitoring.