Finite Element Analysis And Experimental Study On Diameter And Three-Way Of Buried Welding

With the rapid development of urban economy,residents living standards have been significantly improved,which makes the heating demand is rising.China is a large energy consumption,long-term backward energy use technology and unreasonable energy consumption structure exacerbated the energy crisis.In view of the above problems,urban central heating is undoubtedly the easiest way to alleviate energy pressure and reduce environmental pollution.The city’s central heating mode is one of the important signs of urban environmental protection,economic development and cultural construction.Direct burial is not only a small area,short cycle,simple maintenance,small investment and long life.Need,but also can effectively reduce the initial investment in urban heating and energy conservation.Therefore,It is far-reaching significance to carry out in-depth study of direct burial heating technology.In this paper,Firstly,the stability of DN300 heating straight pipe and welded pipe diameter equalization pipe is studied experimentally.Secondly,on the basis of experiment,a solid-diameter straight pipe with long-distance straight pipe and welded equal-diameter three-way finite element model was established.Finally,ANSYS finite element analysis software was used to analyze the effects of different diameter heating pipes and welded pipe equal diameter pipes under different temperature,different pressure and different force-displacement loads.Through the experimental and finite element simulation analysis,the main conclusions are as follows: when the pressure is the same,the higher the temperature,the maximum value of the stress and the total deformation maximum of the whole buried pipe;when the temperature is the same,The greater the maximum stress of the whole pipe,and the smaller the total deformation maximum;from the stagnation to the ends,the stress is getting smaller and smaller,the total deformation becomes bigger and bigger.It is only possible to change the local stability of the weld at the same time,so that the finite element simulation of the equal diameter and three links can be carried out.The stress of the welded pipe is mainly concentrated in the tee opening and the abdomen,and the total deformation is mainly concentrated at both ends.Active section welding equal diameter distribution of the three-way stress is very irregular,in the three openings,abdomen,shoulder and the arm length are stress concentration phenomenon,the total deformation of the maximum is mainly concentrated in the three links shoulder.Based on the above conclusions,the finite element simulation analysis and testing can be carried out at the beginning of the design to determine the maximum position of stress and deformation,and the corresponding reinforcement protection measures can be taken at the time of laying,which can further extend the service life of the buried pipe.