Continuous Rigid Frame Bridge Jacking Process Simulation Analysis

With the development of transport, such as road clearance height of the navigation channel to improve the level of line targets, and routes with the environment, such as the growing demand to increase, there are many bridges have been in service can not meet the increasing traffic demands, resulting in a huge contradiction. Structural capacity to meet the prerequisite, because the line does not meet the requirements only on the demolition and reconstruction, not only will cause a huge waste, but also in the community have any adverse effect.Under-bridge headroom for the status quo, an urgent need to find a scientific and rational method of transformation to meet the requirements of clearance under the bridge, but also can continue to play a role in the original bridge, the bridge is the top or high technology is aimed at old bridge used to carry out the direction of the vertical uplift and transformation of a technical countermeasures.In this paper, the transformation to the top of the Culture and continuous rigid frame bridge Kangyadi based on engineering, detailed analysis of continuous rigid frame bridge jacking pre-construction, construction process, after construction, the lower part of the structure of simulation analysis methods, analysis of the structure of various conditions of the working force, and made a number of top-up construction methods and technologies such as construction technology.The reforming process was studied with simulation analysis to study the effect of nonsynchronous rising on the bearing capability of the superstructure and the reaction force at the support, and the influence of the original piers and temporary piers on the internal force of the pile cap. The elevation method, procedure as well as its monitoring were presented. It was found that during the elevation period, the maximal principal tension stressis 1.15 MPa, the principal compression stress is 4.72MPa, and the maximal horizontal displacement of the temporary pier is 1.57 mm. So the bearing capacity of the superstructure is insufficient, it needs to be strengthened by external tendon method. The application indicates that the elevation technology can obviously improves the performance of the bridge with the advantage of short construction, low cost and non-interfering of traffic. Want to play the role of "start" of the role of the technological transformation of China Road Bridge provide useful lessons.