铜陵长江公路大桥与长沙湘江北大桥均系建筑在宽阔深水江面上的大跨径预应力混凝土斜张桥。本文着重介绍该两座大桥的围堰加管柱的大型深水基础的设计与施工。以往此类结构均以桩承受全部外力,围堰只作为施工手段不参与受力。而铜陵长江大桥则突破此先例,让围堰与承台、封底混凝土形成一闭合整体共同受力。 Tongling Yangtze River Highway Bridge and Changsha Xiangjiang North Bridge are all built on a wide deep-water surface of the long-span prestressed concrete inclined beam bridge. This article focuses on the design and construction of large deep-water foundation of cofferdam and pipe string of the two bridges. In the past such structures were to pile all the external force, cofferdies only as a means of construction do not participate in the force. The Tongling Yangtze River Bridge is to break through this precedent, so that cofferdam and cap, concrete back to form a closure of the overall joint force.