Stepped bioretention device for runoff on highway pavement

Abstract

The invention discloses a stepped bioretention device for runoff on a highway pavement. The device comprises a pre-sedimentation tank and bioretention tanks, wherein the pre-sedimentation tanks are arranged at a highway side ditch, and the bioretention tanks are attached to the pre-sedimentation tank; and the biological detention tanks are arranged in a stepped manner from top to bottom, and flow guide main pipes for flow guide are arranged on the side walls of the biological detention tanks. According to the bioretention device in the technical scheme, solid particles in initial rainwater runoff can be removed in the sedimentation tank through the sedimentation effect through the pre-sedimentation tank, rainwater is discharged into the bioretention tanks through the water outlet of the pre-sedimentation tank and permeates and is purified through a bioretention tank filler, rainwater purified by the bioretention tank filler flows into a drainage ditch at the bottom of a roadbed through a main drainage pipe, and when the rainfall intensity is large, the rainwater flows into the lower-stage bioretention tank through the overflow drainage pipe and is stagnated, stored and purified through the lower-stage bioretention tank, so that the aim of stagnating, storing and purifying the runoff of the expressway step by step is achieved.

Description

technical field [0001] The invention relates to the technical field of bioretention, in particular to a ladder-shaped bioretention device for road surface runoff of expressways. Background technique [0002] In recent years, with the development of the national economy, the mileage of expressways in our country has increased significantly. However, traditional expressway pavement drainage usually uses roadside gutters to collect rainwater, and then discharges it into the drainage ditch through rapids set at certain distances, and then flows into the downstream water body through the drainage ditch. The traditional drainage method based on hardened ditches not only shortens the confluence time of runoff and increases the confluence water volume under high-intensity rainfall, but also causes frequent flood disasters along the road. At the same time, a large amount of pollutants accumulated on the road surface Under the action of leaching and scouring, it enters the rainwater ...

AI Technical Summary

Problems solved by technology

The traditional drainage method based on hardened ditches not only shortens the confluence time of runoff and increases the confluence water volume under high-intensity rainfall, but also causes frequent flood disasters along the road. At the same time, a large amount of pollutants accumulated on the road surface Under the action of leaching and scouring, it enters the rainwater runoff, and finally discharges into the natural water body, which will easily cause serious deterioration of the water environment along the road

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