Span Prestressed Concrete Continuous Rigid Frame Bridge Alignment Control

With the development of science and traffic enterprise in our country, the prestressedconcrete rigid frame bridge has been growing up rapidly in the recent years with its uniquepredominance of handy construction, economical cost, reasonable internal force andcomfortable traveling. During the cantilever construction of the prestressed concretecontinuous rigid frame bridge, the beam axis shape of formed blocks can't be regulatedduring the subsequent constructions. To ensure the successful closure of the bridge, andmake sure that the axis shape and the internal force of the bridge accord with the designrequest, construction control is of great importance during the bridge construction.There are two important contents, structure line shape and structure stress, inconstruction monitoring and controlling of bridge of cantilever construction. They must beput into practice all-round to making construction propitious and reaching the design point.We establish the analytic model of the bridge and choose appropriate structure parameters.We also take adequate influencing factors into consideration. Through constructioncalculating, monitoring, back coupling and forecasting the construction control of thisbridge is realized and the preplanned target is reached at last.On the base of An'deng viaduct, applying for its special character of the constructioncontrol of predtressed concrete continuous rigid frame bridge, the paper brings forward areasonable scheme of observation in the course of construction control, and establishes acomprehensive monitoring system. During the construction control of the bridge, thestructural displacement and stress of main sections were acquired successfully. Accordingto the differences between the design value and the survey value, we adjusted the primarydesign parameters by least square method to make the value calculated accords with theactual value. It had been proved that this control was successful and these theories andmethods had highly practical effect on construction control of the prestressed concretecontinuous rigid frame bridge. The researches of this paper will become the bases of thefurther research in the same aspect.