Self-anchored Suspension Bridge Technology Research

Over the years, the self-anchored suspension bridge in China as a new bridge structure is favored by much designers with its own unique form .But its development is still at an early stage in China, the study for it is less.This thesis combinated with the construction process of the sanchaji self-anchored suspension bridge in Changsha, the key technology and construction control were studied, the research result with practical value was made from it, which may provide reference for other self-anchored suspension bridges building.Firstly, the history of development, structure, mechanical characteristics, advantages and disadvantages of the self-anchored suspension bridge were introduced, as well as the similarities and differences between the self-anchored suspension bridge and the anchored suspension bridge.Secondly, the study vector - sanchaji bridge in Changsha was put forward, the project profile of the project was introduced. Then the difficulty and the controlling in the construction were studied.Then based on the self-anchored suspension bridge, the key technologies to be resolved in the construction were studied, which was the construction of the main tower pier in water, the construction measures of the diagonal tower column and the construction method of the capping beam were introduced. Using the impact drilling to construct the pile foundations with diameter of 3.5 meter, this was still the first example in domestic.Finally, from the comparison of the method of incremental launching in the stiffener steel box girder, the method of linear controlling in the installation of it was presented, and the large-tonnage prestress crane in water was first used in the construction. In the system conversion of the self-anchored suspension bridge, the construction method of first lifting the bridge deck and the completed system conversion of the beam placement after the installation of hanger rod with no stress and strain was first presented.