The Application Of Single And Double Wall Combined Steel Cofferdam Technology For Deepwater Foundation Construction Of Bridge

The application of bridge steel cofferdam construction in deep foundation is more and more extensive. However, people often apply to the decomposed steel cofferdam for the local stresses analysis and neglect the space effect, which can't really reflect the steel cofferdam's actual stress state. The paper depend on the item of Shatian super large bridge engineering in the Gangjiang river, firstly, according to the water depth condition, the structure form of the steel cofferdam has been optimized, and a economical steel cofferdam-single and double combined wall steel cofferdam has been advanced. Secondly, three-dimensional finite element software of MIDAS is used to carry on mechanics and deformation analysis of the single and double combined wall steel cofferdam. The strength, stiffness and stability of the steel cofferdam are also analyzed under the most unfavorable processing condition case. The stress distribution law and deformation features are obtained. The analysis results indicated that the strength, stiffness and stability of the most component of the steel cofferdam can meet standard requirements, but the stress of the local bulk head and level stiffener exceed the design strength, which need local stiffening. At last, combined with the construction practice of the Shatian super large bridge engineering, the analysis of the steel cofferdam's processing and making, launching and fitting, heightening and sinking and bottom sealing are made, which can provide technical support for the construction of the steel cofferdam in deep-water foundation go large bridge.