Study on Optimization of Construction Scheme of Prestressed Continuous Box Girder Bridge with Small Curvature Radius
When the prestressed continuous box girder bridge is arranged on the road ramp,the longitudinal slope and transverse slope of each segment of the beam often change due to the small curvature radius.The behavior of referring to the transverse slope value to tilt each beam section of the bridge is performed in order to meet the requirements of bridge structural construction,resulting in a great increase in the difficulty of bridge construction and linear control.Therefore,it is very important to choose the appropriate construction scheme to reduce the construction difficulty.The curve radius of the prestressed continuous beam bridge on the C ramp(32+56+32)m of Houtian Hub of Nanchang Ring Expressway is 260 m,and the transverse slope value is as high as 4%.Based on this case,this paper analyzes and compares the characteristics and differences of the construction schemes of the hanging basket cantilever method and the full space support method.The results show that the full space support method can greatly reduce the construction risk and has higher construction economic benefits,which is the optimal scheme.
small curvature radiuscontinuous box girder bridgehanging basket cantilever methodfull space support methodscheme optimization
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