Reasearch And Application On Elevated Highway Drainage Security System

Based on the Eastern Middle Ring Highway Project,this thesis summarized and analyzed hydrological calculation method of highway drainage system,which focused on the characteristics of its "all overhead highway" form.The calculation method contained several aspects,including flow,capacity of highway storm inlets,interception capacity of bridge slope storm inlets.The calculating process about highway drainage design was established and verified on the demonstration section.The 2-D hydrodynamic simulation about the highway storm runoff was carried on using CFD to compare with the process of theoretical calculation.According to the characteristic of highway drainage system,appropriate LID technology was selected to meet the demand of pavement,building drainage system,ground,underground space.Such technologies,including OGFC,highway drainage storm storage tank,sunken green space,rainwater garden,highway storm storage system,were analyzed and studied.Focusing on the highway storm storage and pollutant control,the technical route of engineering implementation was put forward and the demonstration research was carried out.It was concluded that normal highway drainage design should follow the procedure summarized in this study.But some special road,such as steep slope and ultra wide road,etc.should be calculated with hydrodynamic simulation,also with physical model test when necessary.In addition,the study showed that highway storm storage system and pollutant contral technology had a good effect on elimination on COD,SS,NH3-N,TN,TP and heavy metal,which could achieve a stable effulent quality.