跨敏感水域特大桥桥面径流收集系统设计方案

Design Scheme of Runoff Collection System on Bridge Deck of Super Large Bridge Crossing Sensitive Waters

以临猗黄河大桥主桥为例,对不考虑溢流的集中排水系统和初期收集+溢出管排水系统两种桥面径流收集方案进行了分析比较,经过水力设计计算,得出主桥适用于纵向排水采用变管径的初期收集+溢出管纵向排水系统;设计时为保证长联结构纵向排水管在伸缩缝处能够自由伸缩变形,在55#墩处设置3 m长伸缩节,同时调整54#~56#墩纵向排水管坡率。

Taking the main bridge of Linyi Yellow River Bridge as an example,this paper analyzes and compares the two deck runoff collection schemes of centralized drainage system without considering overflow and initial collection+overflow pipe drainage system.After hydraulic design and calculation,it is concluded that the main bridge is suitable for longitudinal drainage and adopts the initial collection+overflow pipe longitudinal drainage system with variable pipe diameter;In order to ensure that the longitudinal drainage pipe of the long-distance structure can freely expand and deform at the expansion joint,a 3 m expansion joint is set at pier 55#,and the slope rate of the longitudinal drainage pipe at piers 54#to 56#is adjusted at the same time.