Comparative Study On Abutment Reinforcement And Reconstruction Schemes Of Lianghekou Bridge On Line G243

In the western underdeveloped areas,under the condition of limited maintenance funds,how to scientifically and rationally choose bridge reinforcement schemes not only determines the cost-effective use of limited maintenance funds,but also affects the durability and service life of the bridge structure.Based on the research background of the Lianghekou Bridge reinforcement project on the G243 line,this paper analyzes the cause of the gravity abutment disease and proposes a targeted reinforcement plan.The method of comparison and selection of bridge reinforcement schemes is studied,and the risks of implementation schemes in the construction process are analyzed.Evaluation of the reinforcement effect of the implementation plan from the perspective of technology,reliability,and economy verifies the feasibility and reliability of the comprehensive comparison and selection method of bridge reinforcement plan.Draws the following conclusions:1.Analyze the mechanism of gravity abutment diseases based on natural and geological conditions,and propose targeted reinforcement schemes to provide management personnel with ideas and experience in analyzing and treating similar diseases.2.Aiming at the shortcomings of the existing comparison and selection methods,a comprehensive,simple and effective method is proposed,that is,the comprehensive comparison and selection method for bridge reinforcement schemes.This method is based on the fuzzy analytic hierarchy process,which quantifies qualitative indicators to a certain extent,and can compare the reinforcement schemes objectively and systematically.3.Use the ABAQUS finite element software to simulate the collision process between the old beam lifting and the cover beam,and analyze that the collision speed has a greater impact on the substructure relative to the collision position and angle,and is easier to control.Therefore,the lifting speed must be strictly controlled during lifting and dismantling.4.From the perspective of reliability,the structural safety of the bridge abutment dismantling and reconstruction scheme is evaluated as one type.Under the same conditions,the structural safety level is improved by 1 compared with the abutment grouting reinforcement scheme,indicating that the service life of the bridge has been further extended and the durability has been obtained.Greatly improved.5.From the full life cycle analysis and comparison of the two programs,using the annual value method,it is concluded that the equivalent annual value of the abutment dismantling and reconstruction program cost is less than the equivalent annual value of the abutment grouting reinforcement cost,indicating the use of maintenance funds for the abutment dismantling and reconstruction program The benefit is higher.