Analysis Of Interface Performance And Reinforcement Effect Of Steel Epoxy Sleeve Reinforcement Pipeline

In recent years,the steel epoxy sleeve repair technology,as a non welding repair technology,has gradually become a common method in pipeline repair and reinforcement engineering.This technology can effectively achieve pipeline repair and reinforcement without affecting the normal operation of the pipeline.Research has gradually been conducted on the repair process,repair mechanism,and reinforcement effect of steel epoxy sleeves.The overall reinforcement structure of the steel epoxy sleeve reinforced pipeline is formed by pouring epoxy resin.Among them,the bonding layer between the steel epoxy sleeve and the pipeline is an important part of the reinforcement structure.If the bonding layer is damaged,it will lead to the failure of the entire reinforcement structure.Due to the complex load forms that pipelines bear in use,including internal pressure,bending moment,and combined loads,the bonding layer is easily damaged.Therefore,analyzing the interface bonding performance of steel epoxy sleeve reinforced pipelines under different loads is of great engineering significance.This article adopts a combination of full-scale pipeline testing and finite element simulation to study the interface bonding performance and reinforcement effect of steel epoxy sleeve reinforced pipeline.The main content is as follows:(1)Through the explosion test of steel epoxy sleeve reinforcement pressure pipeline under internal pressure,the characteristics of bond interface failure under internal pressure,as well as the experimental data of circumferential and axial stress,were obtained.The influence of bond interface cracking on the reinforcement effect of steel epoxy sleeve under internal pressure was analyzed,and it was determined that the performance of the adhesive layer interface may change the repair effect of the sleeve on the pipeline.(2)The tensile strength test of epoxy resin material,the positive tensile bond test between pipe steels,and the shear strength test between pipe steels were completed,and the bond slip curve of epoxy resin was established.At the same time,ABAQUS finite element simulation was used to conduct internal pressure explosion tests on reinforced pipelines,and the influence of adhesive layer thickness,elastic modulus of adhesive layer,thickness of steel epoxy sleeve,and length of steel epoxy sleeve on interface bonding performance was analyzed.(3)Completed the bearing capacity test of steel epoxy sleeve reinforced pipeline under the combined action of internal pressure and bending moment load,obtained the bearing capacity performance of steel epoxy sleeve reinforced pipeline under complex load,and completed numerical simulation analysis for the test pipeline.Further analysis was conducted on the thickness of adhesive layer,elastic modulus of adhesive layer,thickness of steel epoxy sleeve under the combined action of internal pressure and bending moment load.The influence of the length of steel epoxy sleeves on the interfacial bonding performance.