Design Of Emergency Repair Equipment Of High-speed Rail Bridges And Analysis Of Mechanical Properties

Recently, the construction of high-speed railway in our country has been rapidly developed. China has been one of the countries with the longest operation mileage,highest operation speed and biggest under-construction scale. However, the research on the emergency support technology that deals with all kinds of disaster damage of high-speed railway bridges are still in the early stage, and fell behind the development of high-speed railway. Among them, the technical reserves of high- speed railway concrete bridge’s emergency repair and recovery, as well as the development of high-speed rail bridge repair equipment, are basically in a blank state.Based on the above, the research in the paper are entrusted by the major research project of China Railway Corporation, which named The Profound Research on the Technology of High Speed Railway Operation and Maintenance and High Speed Railway Concrete Bridge’s Emergency Repair and Rapid Recovery. The contract number of this project is 2014G008-A.On the basis of a summary about the existing technologies and methods of railway concrete bridges’ emergency repair, the advantages and disadvantages of various methods and the applicability of high-speed railway concrete bridges’ emergency repair and rapid recovery were analyzed. The design of the technology solutions to a new type of rush-repair steel beams, which suitable for the concrete simple supported beam bridges of high speed railway for 32 m span and below and a new type of rush-repair steel piers, which fit for 40 m height and below, was carried out. Using finite element software ANSYS, the high-speed railway rush-repair steel girders for the cases of 24-meter-span and 32-meter-span and the high-speed railway rush-repair steel piers for the cases of 8.5-meter-high, 15-meter-high, 25-meter-high and 40-meter-high were analyzed by numerical simulation. The strength, stiffness, stability and other mechanical properties of the structures were analyzed in detail. Modal analysis was carried out for the dynamic performance of the structures. And the calculation results based on the "Code for design of high speed railway "and "the technical procedures of railwaybridge repair(construction)"(Trial) were checked and analyzed. At the same time, the complex rack rail structure directly under dynamic loads was calculated through finite element numerical technology, and fatigue strength checking computations and stability analysis were carried out.Based on the research of this paper, the design scheme of high-speed railway rush-repair steel beams and piers was put forward. The paper propose a conclusion about the change of the mechanical properties of the two span steel girders and four types of high piers in the design load,and the weak parts of the structure was found. The paper provided a reference for the further research and the improvement and optimization of the maintenance equipment. It is much significant for improving the ability of China’s high-speed railway that deals with disaster damage.