The Theoretical Analysis And Feasibility Study On The Non-compensating And Cold Installation Directly Buried Heat-supply Pipeline

With the rising level of technology,the urban central heating is becoming more and more common, and directly buried heating pipeline technology is becoming more and more mature,in which,the non-compensating and cold installation directly buried heat-supply technology is worthy of promotion,which has little construction difficulty and cost. About the security of the non-compensating and cold installation directly buried heat-supply,there isn’t a lot of relevant documents for reference.But there have been some areas of the city heat-supply using the non-compensating and cold installation directly buried heat-supply, from the using of the results, the practical effect is very good.According to this,in this paper, first of all,it has done the detailed description for the development background, laying method and stress analysis of directly buried heat-supply pipeline;secondly, it has done the theoretically calculations of the non-compensating and cold installation directly buried heat-supply using stability analysis method,to prove that it is possible theoretically;at last, According to the actual problem provided by the heating company, using this method of heat-supply, heat-supply pipeline’s thermal extension is not obvious when it is heat, therefore, In view of this situation,we use the simulation software to verify the actual engineering,and form a complete research system.The major conclusion: the small angle in the process of welding results in decrease of heating pipeline’s axial elongation,and as long as meeting certain conditions, non-compensating and cold installation mode is possible.With the slight angle increases, the heat-pipeline’s thermal extension decreases gradually; buried with soil depth increases, the heat-pipeline’s thermal extension also decreases gradually,the stress becomes larger,with heat-pipeline’s diameter increases, the heat-pipeline’s thermal extension becomes smaller and stable, large amount of thermal elongation angular pipeline analysis, the angle being chosen to break the "rules" of the limits on the maximum value of the angle.