围堰气囊下水法因为适应性强，投入少等优点，在桥梁基础施工中得到越来越多的应用。但目前尚无系统的分析与研究。对围堰下水过程的静力与动力进行理论分析，推导计算围堰下水过程中的入水角度、前端入水深度以及运动速度等参数信息。通过实例计算证明，所提出的计算方法分析精准、可靠，已在多个围堰工程中得到应用。%With high adaptability and very little cost,the method of cofferdam launching with airbags gets more and more applications in the construction of bridge foundation.But theoretical research on it is imperfect.In this paper,some theoretical derivation and calculation of cofferdam launching on static and dynamic situations are made.The calculation results show us much information such as the angle, the speed,and the underwater depth of the cofferdam.Besides,a real bridge by the method proposed in this paper is calculated to validate the feasibility of the method.This method has been applied in many proj ects.
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