According to the constructed character of Baojixia added dam & gate,the paper analyzed and explained the design and application of the reinforced concrete cantilever cofferdam which can be applied in middle and small dam project.

Because it is relatively difficult to construct double-wall steel cofferdam under water and the control process is complex,whether the steel cofferdam is adopted or not resting with engineering geology situation and technology condition.

This paper presents the design and checking computation method of large-scale double-wall steel cofferdam,which may serve as a reference for design of deepwater foundationed steel cofferdam of similar bridges.

This paper summarizes some of the new construction methods and construction technology for double-wall steel cofferdams applied to the construction of in-water foundations of mountainous bridges and also introduces the applicable range,control points and existing problems of several of the technology.

This paper presents the design and construction of double wall steel cofferdam for main pier 24 and 25 of the Fourth Bridge on Xiangjiang in Xiangtan.

,the paper presents an introduction to the arrangement of positioning barges under various conditions of water and tidal flows,the hydraulic calculations for the anchorage systems,and the technology for fabrication,assembling,and lowering down to foundation bed of the double wall steel cofferdam.

This paper introduces the water stopping technology for a new type of double wall steel cofferdams with vertical splitting,which was successfully used for the construction of No.

Since the dimensions and loads imposed on the single-wall steel cofferdam of deep-water foundation for Yuxi Road Bridge in Chaohu city are large and the structure is complex,three-dimensional analysis by means of FEM program for force status of the monolithic structure has been made in order to study its mechanic features and.