Process Control Technology During Cast-in-place Cantilever Construction in Long Span Prestressed Concrete Continuous Beam Bridge

This paper analyses the effect of temperature on deflection and structural stress of main beam during cast-in-place cantilever construction in long span prestressed concrete continuous beam bridge with a practical example. An even alignment of main beam is formed by the rational selection of the time for the mould plate location and the adjustment of elevation of the mould plate under different temperature. The prestressed steel bar is drawn when there is uniform temperature of the main beam body, so that the prestress loss can be decreased. The determination of structural stress and its increase quantity is the basis for the improvement of parameters of construction technology.