极端降雨频发背景下城市桥梁排水设计探讨

Discussion on Drainage Design of Urban Bridges under Background of Frequent Extreme Rainfall

摘要:

在极端暴雨天气频发的背景下，桥梁作为城市交通网络的重要一环，桥面排水是否通畅成为影响交通安全的重要因素。在梳理现有桥梁排水设计规范、排水设施和存在问题的基础上，选取全国16座城市的暴雨强度公式，计算了典型桥梁结构的排水能力，发现排水管直径和悬吊段底坡是影响排水系统排水量的主要因素。常规桥面排水系统能满足排水要求，但应考虑适当余量以满足极端降雨条件下的排水需求。

Abstract:

Under the background of frequent extreme rainstorms, as an important part of the urban traffic network, whether the drainage of the bridge deck is smooth or not becomes an important factor affecting traffic safety. On the basis of combing the existing bridge drainage design specifications, drainage facilities and existing problems, the rainstorm intensity formula of 16 cities in China is selected to calculate the drainage capacity of typical bridge structures. It is found that the diameter of drainage pipe and the bottom slope of suspension section are the main factors affecting the drainage flow of drainage system. The conventional bridge deck drainage system can meet the drainage requirements, but the appropriate allowance should be considered to meet the drainage requirements under the extreme rainfall conditions.