关于弯曲航道上桥梁通航净宽的探讨

Discussion about navigable clear width of bridge on bend navigable waterway

在弯曲航道上建桥,为保障船舶航行安全,应适当加大桥梁通航孔跨度,同时要考虑节省工程投资,因此,合理确定通航净宽尺度至关重要。针对现行规范弯道处桥梁通航净宽计算取值困难的问题,结合徒骇河某铁路桥实例,采用平面二维水流数值模拟及船舶操纵模拟试验方法,直接确定了桥墩紊流宽度和船舶航迹带宽度,结合规范中通航净宽的计算方法,得到了较为合理的通航净宽值,并与公式结果进行了对比,对航道和桥梁设计提供了科学参考依据。

To build a bridge on bend waterway,in order to ensure the navigation safety of ships,the navigable width of the bridge should be appropriately increased,and at the same time,the project investment should be saved.It is important to reasonably determine the navigable clear width.In view of the difficulty in calculating the navigable clear width of the bridge on bend waterway in the current code,takeing a railway bridge on Tuhai River as for example,the turbulence width and the ship's track width are directly determined by using the two-dimensional flow numerical simulation and numerical simulation of ship maneuvering motion,combined with the calculation method of the navigable clear width in the code.The more reasonable navigable clear width is obtained by comparing with the formula results.It provides a scientific reference for the design of waterway and bridge.