为适应北京城市发展的需要，北京市水利工作重点已逐渐由郊区水利向城市水利发展。桥梁是水利工程的重要组成部分，不仅要满足桥上交通功能，而且要求桥型美观大方，有通航要求时还要保证桥下通航净空。但受城市市政诸多因素的制约，城区内桥面高程和桥下水位调整范围有限，减 In order to meet the needs of urban development in Beijing, water conservancy has gradually shifted its focus from suburb water to urban water conservancy. Bridge is an important part of water conservancy project, not only to meet the traffic functions on the bridge, but also requires the bridge beautiful, generous navigation requirements, but also to ensure that navigation under the bridge clearance. However, due to the constraints of the urban municipalities and many other factors, the bridge deck elevation in the urban area and the water level adjustment under the bridge are limited.