Parameterized Design And Experiment Of Mechanical Grouting Clamp With Embedded Wedge

Jacket plays an important supporting role in the offshore platform.As the cornerstone of the entire platform,its reliability is very important to ensure the safety of the personnel on the offshore platform.However,the marine environment is complex and harsh,and jackets working under the sea are often damaged due to seawater corrosion,which affects the carrying capacity of the jackets.Therefore,the jackets need to be repaired.Taking into account the economic and practicality,the use of grouting clamps to repair pipelines has become the best solution.Therefore,in this article the in-depth study on grouting clamps to repair jackets has been conducted,and a parametric design method for grouting clampsis:The method of designing according to defects has been summarized.First of all,in this article author reviewed and summarized domestic and foreign literature,and got the previous design method of grouting clamp.On the basis of predecessors,a parametric design method to determine the length of the clamp according to the size of the defect is proposed.Then the main principles and basic design steps of the design method are summarized.A calculation example was analyzed according to the actual conditions of ocean engineering,which provided a design example for the designer.After that,a mechanical grouting clamp with embedded wedge and its overall structure were designed according to this design method.In order to increase its bearing capacity,a wedge tooth clamping mechanism was also designed.The bearing capacity,slippage force and minimum tooth profile of the wedge tooth were analyzed and studied.Next,in order to study the load-bearing performance of jackets,author carried out axial compression buckling analysis on ideal jackets and damaged jackets,and got their critical buckling stress,that is,their ultimate bearing capacity.Since the grouting clamp works under the sea,it will also be affected by the dynamic load.Therefore,according to the different installation positions of the grouting clamp,the wave force on them was analyzed,so that the slippage of the grouting clamp in the marine environment could be obtained.Finally,in order to further study the reinforcement of the damaged jacket by the grouting clamp,an axial compression experiment was designed to study it.First,the ideal jacket and the defective jacket were subjected to axial and radial compression experiment,and then the same jacket reinforced by the grouting clamp was subjected to the axial and radial compression experiment.Through the comparison of the results of the two experiments before and after,it can be shown that the grouting clamp can improve the bearing capacity of the pipeline very well,and has a good ability to repair the jacket.Afterwards,a slip experiment was carried out and the equivalent friction coefficient of the wedge teeth was obtained.