| Abstract: | When large damage, such as rupture and leakage, occurs in buried pipeline, a steel pipeline extrusion throttle device is applied to crush the pipeline and block the oil flow quickly in a short time. An extrusion model under uniformly distributed radial load is established based on the theory of plastic deformation and the principle of virtual work. The pipeline plastic deformation is analyzed and computed and the pipeline extruding load is obtained. The extrusion of X60 steel tube of 325 mm diameter and 6 mm thickness loaded by indenter of 18 mm width is examined. The load-deformation curve of pipeline extrusion is obtained. The results of the comparison between experimental data and theoretical data show that the model is in good agreement with the experiment. This model can be used to calculate the extruding load of pipelines of different sizes and provide the theoretical and practical reference for urgent repair of pipeline leakage. |
