...olerance Zone) 10．同轴度(Coaxiality)：轴线位置控制 11．对称度(Symmetry)：中面位置控制 12．松动螺栓连接(Fixed Fasteners) 13．固定螺栓连接(Floating Fasteners) 14．同心度和对称度(Concentricity/Symmetry) 15．同心度(Concentricity)：中点位置控制...
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轨道连接螺栓松动，造成轨道位移，也会引起倒塔。
Rail connection bolts loose, resulting in track displacement, will also cause the tower.
某钢厂列吊车梁在工作中，由于吊车工作的动态作用，导致制动梁（连接板）经常发生断裂，固定连接板的螺栓松动。
The brake beam(connecting plate) is often broken, and the bolts for fixing the connecting plate are loosed due to the crane′s dynamic load when D series of crane beams are working in a steel plant.
塔机司机在交接班时，应检查各连接部位螺栓的紧固情况，如有松动应及时紧固。
Tower crane driver in the shift, should check the connecting parts of the fastening bolts, such as loose should be tightened.
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