Technology Research Of Partially Cable-stayed Bridge Key Construction

Along with the bridge design and the construction technology unceasing development, the cable-stayed bridge as one kind of outstanding bridge obtains widely application. In certain situations, if designs pre-stressed concrete continuously beam , the beam section is oversized but some reluctantly, if designs the regular partially cable bridge is not too economical, this time we may consider uses between pre-stressed concrete continuously beam and the pre-stressed concrete partially cable bridge passage type, namely pre-stressed concrete short tower partially cable-stayed bridge.Chaobai River bridge main span design are three short towers partially cable bridge, mainly applied, single box three room girder three the pre-stressed construction technology, the cable-stayed bridge cable tower construction technology, the cable construction technology, the cable bridge construction monitoring technology, by gradually removed support and one time removed support the construction system transformation contrast analysis technology.Because of short tower partially cable-bridge is multiple indeterminate structure, the process of constructing has influence on stress of the whole bridge, it is necessary to optimize the process of constructing for specific bridge engineering. In this thesis, based on Chaobai River, the different constructing processes are simulated by MIDAS-Civil soft. The influence of different constructing processes on stress and deformation is analyzed. The original designing constructing process that the scaffolding is removed under the beam segment which corresponding a couple cables were stretched is optimized. The construction processing that removing all scaffolding after all cables were stretched and then perform locking segment construction. The monitoring data indicates that this construction process is better the original process. The conclusion has reference value for similar bridge engineering.