Study On Construction Control For Large-Span Prestressed Concrete Continuous Rigid Frame Bridge

With the development of science technology and traffic enterprise in our country, the prestressed concrete continuous rigid frame bridge has been growing up rapidly in the recent years with it's unique predominance of handy construction, economical cost, reasonable internal force and comfortable traveling. During the cantilever construction of the prestressed concrete continuous rigid frame bridge, the beam axis shape of formed blocks can not be regulated during the subsequent constructions. To ensure the successful closure of the bridge, and make sure that the axis shape and the internal force of the bridge accord with the design request, construction control is of great importance during the bridge construction.There are two important contents-structure line shape and structure stress in construction monitoring and controlling of bridge of cantilever construction. They must be put into practise all-round to making construction propitious and reaching the design point. after establishing the analytic model of the bridge, choosing appropriate structure parameters, taking adequate influencing factors into consideration, The construction control of this bridge is realized through construction calculating, monitoring, back coupling and forecasting and the preplanned target is reached at last.On the basis of the changxin viaduct, according to its special character of the construction control of prestressed concrete continuous rigid frame bridge,the paper brings forward a reasonable scheme of observation in the course of construction control, and establishes a comprehensive monitoring system. During the construction control of the bridge, the structural displacement and stress of main sections were acquired successfully. Based on this, this paper has analysed an the differences between the theoretical values and the survey values. by comparing theoretical values with survey data, the influence of concrete creep on bridge structure under the construction has been analysed.