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.rnResearch 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.%研究目的:在近年铁路客运专线建设中,连续梁跨越既有铁路时多采用平转法转体施工,部分连续梁具有跨度大、转体重量大、平面曲线半径小等特点.此时,需要对转体结构的关键部位和工艺实施的关键环节进行计算分析,并研究考虑平面曲线对转体结构设计的影响,解决球铰转盘的设计和关键施工工艺问题.研究结论:(1)拟定合理的转盘、球铰尺寸,分析转盘等特殊部位的局部应力是转体重量大时转体结构设计的关键；(2)计算不平衡转动力矩、设置转动偏心是解决平面曲线影响的方法；(3)通过称重、配重等工艺试验,可以验证不平衡转动力矩、转动偏心、摩擦系数等理论计算结果.
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