Abstract：Research purposes: In recent years，the horizontal rotation method is adopted in construction of railway passenger dedicated line when the continuous beam bridge crosses the existing railway. Some of the continuous beams have the characteristics of large span，heavy weight of rotating body and small radius of plane curve. So，it is necessary to calculate and analyze the key parts of the rotational structure and key links of construction and study the influence of plane curve on design of the rotational structure for solving the problems in design of the ball-joint turn table and its construction technology.
Research conclusions: (1) To determine the reasonable sizes of the turn table and ball joint and analyze the local stress of the special position of the turn table are crucial to design of the rotatianal structure when the weight of the rotating body is heavy. (2) To calculate the unbalanced rotating torque and set the rotating eccentric are the ways to overcome the influence of the plane curve. (3) The theoretical calculation results of the unbalanced rotating torque， rotating eccentric，eccentric and friction coefficient can be verified by doing the weighing test and counter weight test.
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2013, Vol. 30 
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