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针对九江长江大桥跨中钢梁伸臂长、合拢精度高等特点,合拢前支点采用了临时支座,合拢节点上下弦加设了合拢铰,并选择合适的合拢顺序及合拢时间。对钢梁里程、中线、合拢点标高调整后,上下游杆件应力差仅在3%左右,合拢后的钢梁拱度曲线亦完全符合设计要求。
For the Jiujiang Yangtze River Bridge span steel beam extending arm length, closing the high precision characteristics, before the collapse of the fulcrum with a temporary support, close the node up and down the chord added close hinge, and select the appropriate closing order and closing time. Steel girder mileage, midline, closing point height adjustment, the upstream and downstream rod stress difference is only about 3%, closed steel beam camber curve also fully meet the design requirements.