Research On Cantilever Construction Constrol In Long-Span Continuous Beam Bridge And Prestress Effect

The construction of rail transport plays an important role in national economic development, especially in the fields of travel traffic, introduction of foreign capital, intensifying Regional Relations, etc. With the rapid development of rail transport, the development of bridge construction technology is also changing with each passing day.Bridge is the important structure which spans the rivers, valleys and other roadblocks. The bridge construction level of our country has stepped into the world top. In the construction of bridge, the advanced equipments, advanced technology and new process, new material, new standard have been widely used, especially in recent years, with the rapid development of high-speed construction, bridges made of prestressed concrete become widely spread around the world. It’s because prestressed concrete takes full advantages of materials’high strength that it can effectively prevent the distress in concrete, reduce the dead weight, increase the span, make the driving comfortable, etc. which makes it applied abroad.Combining with the specific process of LXTJ3straddling Yuying Road continuous beam Cantilever Construction control, this thesis made the following analysis about the monitoring process of continuous beam.(1) This thesis introduced the development of high-span continuous beam of prestressed concrete, the existing present state and the significance of home construction, and introduced the advantages and disadvantages of high-span continuous beam Cantilever Construction.(2) Combining with the practical situation, this thesis stated the content and ways of continuous beam Cantilever Construction, and computing method adopted in structural calculation, and provided theoretical support for analyzing continuous beam systematically.(3) According to the design drawing and the practical situation and all kinds of influencing factors, make construction analogue simulation of continuous beam by using the Midas-Civil finite element. In this way, calculate the loss of prestress under different design parameters and find the influence of loss situation of prestressed steel in different places and during different construction stages.(4) This thesis introduced Construction Monitoring project of LXTJ3straddling Yuying Road continuous beam and collect the displacement changing data gathered in scenes. The data indicated that the line font of the whole bridge changes in a smooth-going way and satisfy the goal requires. This thesis also introduced the processing method of the data of stress test. Comparing the processing results with theoretical value, the writer found the adopted methods have the extremely high accuracy and the stress of the beam body is also safe within a limited range, which sufficiently declare the effectiveness of monitoring system.Combining with the engineering practice, this thesis made micromesh theoretical analysis of Cantilever Construction of continuous beam. Although the bridge construction level of our country has made great progress and construction controlling equipments have become more advanced, many deficiencies still exist in bridge construction monitoring of our country. Hope the textual research can provide a certain reference value for construction monitoring of high-span continuous beam.