Study on Design of Drainage System for Deck and Pavement Runoff across Water Sources
The subgrade and bridge of expressway shall be set away from the source water protection area in general.When the conditions do not permit and cannot be avoided,the emergency treatment system must be considered.The calculation and design methods of the emergency treatment tank has been given in the existing articles when the bridge crosses the source water protection area alone or the subgrade crosses the source water protection area alone.However,few articles mention how to reasonably set up the emergency treatment system when the bridge and subgrade cross the water source protection area at the same time.Weijiu Bridge crosses the source water protection area and some subgrade sections are also within the source water protection area.Through the analysis of common bridge deck drainage methods,combined with the characteristics of this project,an emergency treatment system consisting of bridge deck runoff collection pipeline,subgrade runoff collection pipeline,transit emergency storage tank and emergency treatment tank outside the source water protection area is established,which provides the technical reference for similar projects in the future.
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