The closure joint of Dalian Bay immersed tunnel adopts the jacking segmental method.There is no condition for installing measurement towers in the jacking segment,and the entire process is underwater construction.Traditional positioning equipment is difficult to use,which poses new technical challenges for underwater positioning by jacking the closure joint.Therefore,a underwater positioning system for the closure joint,which is composed of a combination of a wire displacement meter and a camera displacement meters,and a magnetic displacement sensor,is studied to achieve the high-precision positioning throughout the entire process of the closure joint jacking construction.
维普
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