CONSTRUCTION TECHNIQUE THAT BRING EQUIVALENT PRESTRESSED PRESSURE TO BEAR ON NO.0 BLOCK BRACKET OF CANTILEVER CONSTRUCTED BRIDGE

The No.0 block of concrete continuous girder is in complicated stress state under the action of big bearing support counterforce and prestressed stress in three dimensions. The phenomenon of stress centralization in soleplate and costal board nearby the bearing support is in evidence. It expends quite longtime in the duration of concrete construction, because of the very large amount of concrete. It is easy that the asymmetric distortion of bracket crazes the concrete. The paper puts forward the construction method that bring equivalent prestressed pressure to bear on No.0 block bracket of cantilever constructed bridge. This method can availably prevent the concrete crack and economize very much charge when it is compared with the traditional method that throw advanced press with conversion weight. At the same time, the paper introduces the design thinking of the light bracket which can be consulted and used for reference with similar engineering.