Key Technology Research On Swivel Construction Of Continuous Beam Bridge

With the increasing construction of transportation infrastructure in our country, particularly in terms of traffic in the midwest. Under this big background, bridge build level should be improved. When the bridge cross over the existing traffic routes, using conventional construction method not only affect the normal operation, but also a big security hidden danger, but rotation construction method can solve these problems well.Its most obvious advantage is that it does not affect the navigation and transportation of existing traffic and complete the new crossing bridge safe and fast. Therefore, it has broad application and development space in the bridge construction in the future. Because the rotation bridge construction method can produce the remarkable social and economic benefits in the using process. So there is a high research value in the academic research.Presently, the analysis and research on the contact force of the spherical hinge is not mature enough and complete. The research and experiment on the stress distribution of the spherical hinge is insufficient and detailed, and relevant literature is relatively small.In this paper, with idiographic engineering LDK4+546.12 Hu-Zhun railway major bridge(48+80+48)m for which rotation continuous beam acrossing local railways as the research object, research on related mechanical properties of the key parts of the bridge rotation system. Mainly complete the following work. Firstly, reviews the development process and research status of the rotation bridge and clear the content of the study. Secondly, from the theory of finite element analysis of rotary ball hinge force analysis to do a detailed derivation of the calculating formula At the same time combined with the large finite element analysis software ANSYS to do numerical simulation on the key parts of the rotation bridge rotation system. Analysis of stress and strain and displacement of upper and lower spherical hinge are analyzed.and the distribution law of stress and strain in the upper and lower rotary table are obtained and the effective range is determined. Combined with the specific experimental values and analysis of the stress and strain of lower rotary table in the rotation process in horizontal and vertical distribution characteristics, and finite element numerical simulation comparison to determine the numerical experiments of rationality, in turn provide a basis to determine the design of the rotation system and related dimensions. Finally,in order to determine the unbalanced torque,friction coefficient and eccentricity related rotational parameters of the rotation to ensure the bridge next rotation successfully, combined with the specific numerical experiments use the sandbox should force evaluation method and weighing test two methods for determining the unbalanced weight of T-type Rigid rotation of the rotational parameters do the detailed analysis and calculation. By comparing the calculated results with the conclusion, the advantages and disadvantages of the two methods are compared. The accuracy and operability of each method are defined, and the calculation formulas of the unbalanced weight are summarized.