The Study On Body Crack Of Zouxingxian Super-largebridge Pier

GZ EMU Depot is the wide main supporting project of WG passenger dedicated line,it isalso the railway ministry identified the four EMU overhaul base. The piers are solid pier, pieracross the highest amounts to26meters，the concrete amount is the largest amount to1100m3,bridge upper structure dead weight and large load bearing,dynamic load of train pier is atremendous impact,so the railway pier construction requirements more stringent.At present,the construction of large volume concrete especially pier,in the construction process andconcrete materials and maintenance, and many other factors to produce bridge piers apparentcrack and because the causes of its formation and its forming condition different,to solve thiskind of problem，there had been no better control measures.In this paper,according to control construction examples of the running line bridge pierconcrete crack, from much angle, much azimuth, Combining the finite element simulationanalysis, and test control data, the pier concrete apparent crack condition appears on thetheme, structure, To the main structure of the influence and control measures are discussed,etc, Using ansys finite element software pier construction process of the temperature field andstress field is analyzed,and through the pouring temperature,choose rock and templateparameter sensitivity analysis, etc;That lower temperature with casting,piers highesttemperature is lower hydration flavoring substances, In the meet the required strength, underthe premise of choose quartzite can make the bridge pier hydration heat temperature minimum,choose wants inside and outside temperature decrease block pier beneficial.On the function, the temperature field and stress field analysis bridge pier, the sunshinesolar radiation effects, with the passage of time, the sun radiation Angle of change, Northwest,southwest, southeast period, there appeared the highest temperature, but the northeast and didnot appear face high temperature of the phenomenon. This is due to the little sun radiation inthe northeast, The influence of the south-east distance is deep, away from the surface of thedeep place relative several other direction of the temperature, Because concrete thermalperformance is poor, the outer temperature change than the temperature inside the pier changequickly, appear temperature lag, When there is a maximum temperature difference, and didnot appear maximum tensile stress, and under the action of sunlight bridge piers of the greattensile stress.Through the calculation and field, this paper sums up the lead to mass concrete thecracking reason for the bridge pier, and put forward the corresponding treatment measures.For other similar crack control provides the reference.