等比例调坡顶升技术在连续高架箱梁顶升施工中的应用

AbstractIn recent years,the rapid development of transportation industry in China,thetraffic channel height,the level of increase,the route index and other requirementscan not be met,many bridges have been built can not keep up with the growingdemands of traffic.Although many bridges meet the capacity,but because the linedoes not meet the demolition,resulting in the waste of material capital that will causea bad influence in society.Bridge slope adjustable lifting technology is a new reinforcement technology athome and abroad has been widely used,and the technology is a new technology withapplication prospect.The technology with its short construction period,higheconomic benefits from the project construction unit recognition,especially in thetreatment of Bridge Settlement under the bridge the clearance is insufficient,the newand old bridge closure problem has a huge advantage.The combination of NantongCity Jianghai Avenue elevated diversion project top up construction,mainly discussesthe contents of this paper are as follows.(1)the top up technology research transfer characteristics and construction ofmajor difficulties,based on existing practice,analysis of key construction process thebridge girder lifting in the case of integral lifting and precautions,drew up the plansfor the whole project.Lifting system and the lifting construction technology ofclassification.(2)the box girder is simplified into a bar,combined with mechanical knowledge,making construction plan and carry out mechanical calculation.Through calculation,determine the continuous box girder bridge Zaiyuan under the condition of bearingforce,and to determine the size of the top lift.The lifting support system and thelayout of monitoring system.(3)the spatial analysis method of box girder structure theory,including beamelement,shell element method,grillage method and three-dimensional solid elementmethod.By using the method of two-dimensional space plate element of plateelement of discrete structure,the characteristic of this method is to direct calculationsection of the internal force and deformation.(4)in order to carry on and develop the construction scheme in comparison todetermine the feasibility of the scheme,the intended use of the finite element theory,by means of simulation analysis software,establish the model,analysis of changes inthe process of hoisting box girder in force,and internal force generated.Key word:lifting system of slope analysis of continuous box beam finite elementsimulation目录