| At present,with the advance of bridge construction technology,construction of arch bridge method has been developed,the arch bridge with larger spanning capacity,higher bearing capacity and stronger competition ability.Nowadays,there are many methods to construct large span reinforced concrete arch Bridges,Among them,cantilever construction method and strength skeleton construction method are widely used in China,these construction methods have own advantages and disadvantages,such as cantilever construction method to maximum cantilever segmental construction,lead to the cable hanger forces increase,thus improve the tower,cable and anchorage material and technical requirements,the rigid frame construction method consumes a lot of steel,and the construction period is long.The combination method of cantilever casting and stiffening skeleton,not only integrated the advantage of this,and make up for some defects,such as shorten the cantilever length,decrease skeleton steel.This method reduced the risk in the process of construction,also save on building economic cost,make the bridge main arch ring better,let it one of the most promising method.This paper is based on the standard of the construction standardization association of Fuling wujiang bridge and China engineering construction standardization association,which is based on the technical regulations of the legal application of reinforced concrete arch bridge cantilever,Research on the construction of reinforced concrete arch Bridges with cantilever pouring and stiffening skeleton group,based on the existing construction technology and equipment,discuss the key parameters of construction method,and the main research contents include:(1)In this paper,a case study of reinforced concrete arch bridge with cantilever pouring and strength skeleton group is investigated,and the design value of the arch axis coefficient and vector span ratio of the key design parameters is statistically analyzed.(2)Study on the reasonable arch axis coefficient of the concrete arch bridgeBased on engineering,selection of arch axis coefficient is 1.543,1.756,1.900,2.240,compared the calculate by finite element model and analysis of different coefficient of arch axis structure key section stress,deformation and temporary tower under materials consumption,determine the set of legal construction reasonable arch axis coefficient of reinforced concrete arch bridge.(3)Study on the rational vector span ratio of the concrete arch bridgeSelect rise-span ratio of 1/4,1/5.24,1/6,1/7,1/8,based on the finite element modeling calculation,comparison and analysis different rise-span ratio,the construction of the main arch ring the key section in the process of stress,deformation and temporary tower material consumption,determine the set of legal construction reasonable rise-span ratio of the reinforced concrete arch bridge.(4)Study on suitability of reasonable design parametersSelect 300 meters,400 meters span reinforced concrete arch bridge,the trial design based on the above research,and analysis of construction process of the main arch ring stress,deformation,further study and validation reasonable arch axis coefficient and rise-span ratio scope of application. |
