高速公路斜交特大桥水力计算探讨  

Discussion about Hydraulic Calculation of the Outsize Skew Bridge on the Speedway

作　　者：杨苏汀[1] 宋永军[1] 刘晓平[1] 孙羽 

机构地区：[1]华北水利水电学院,河南郑州450011

出　　处：《华北水利水电学院学报》2007年第2期36-39,共4页North China Institute of Water Conservancy and Hydroelectric Power

摘　　要：以处于设计阶段的某高速公路合共特大桥为例,对斜交桥阻水特性、壅水高度进行了研究.针对该桥斜交以及墩形的特点,采用概化水槽模型试验的方法,分析试验成果后提出了斜交桥阻水宽度修正的公式.同时,采用水文计算和形态调查法得出的特大桥设计洪峰流量、断面水位流量关系,对典型斜交桥合共特大桥进行了壅水高度、壅水影响长度、桥下净空核算及冲刷等各项防洪指标的计算,根据计算结果分析了大桥设计桥梁底高程的合理性.Hegong outsize bridge is taken example of a certain speedway in design period, blocking water character and backwater height of skew bridge by general flume＇ s model-experiment are studied. Blocking water width＇ s correctional formula has been put forward according to calculate results. Moreover, outsize bridge＇s relationship of the design peak discharge and section＇s hydrograph are gotten by hydrological calculation and shape survey method. Each prevent flood guide line such as back water height, influencing length and headroom under bridge checking computations have been calculated about typical skew bridge - Hegong outsize bridge. Ultimately the design under-bridge-ground height＇s rationality is analyzed according to calculate results.

关 键 词：斜交桥 壅水计算 折算宽度 桥下净空 

分 类 号：U412.366[交通运输工程—道路与铁道工程]