CN107044081A - Environmental street drainage structure - Google Patents

Abstract

The invention discloses an ecological street drainage structure, which comprises a roadway (1), curbstones (2), rainwater planting pools (4), permeable sidewalks (5), and pedestrian passages between the planting pools (6) ), drainage pipes (7); curbstones (2) are located on both sides of the roadway (1), and the curbstones (2) have two openings at the rainwater planting pond (4), and the curbstones (2) and rainwater A rainwater buffer zone (3) is provided between the planting pools (4) to facilitate the flow of rainwater into the planting pools (4); the entrance of the rainwater planting pool (4) is provided with a stepped basalt weir (41) to allow rainwater to flow in in stages; The water planting pool (4) is followed by bark cover layer (42), planting soil layer (43), artificial filler layer (44), sand layer (45) and gravel layer (46) from top to bottom, and buried in the gravel layer There are perforated pipes (47); the drainage pipes (7) are arranged below the permeable surface layer at the edge of the sidewalk (5). The invention effectively reduces surface runoff, delays runoff time, avoids infiltration of polluted rainwater, and supplements groundwater.

Description

Ecological Street Drainage Structure

technical field

The invention relates to a drainage structure, in particular to an ecological street drainage structure.

Background technique

At present, the street drainage design of our country's cities is still dominated by pipeline drainage, and in the suburbs or urban-rural junctions is mainly based on ditch drainage. The general idea of handling rainwater is still reflected in the word "drainage". With the rapid development of urbanization in recent years, the disadvantages of traditional urban street drainage have become increasingly obvious. This kind of road drainage system with simple discharge as a single method and goal has exposed many problems. In the process of urban expansion, a large amount of natural ground is gradually replaced by hardened surfaces including roads, and the hardening rate of the surrounding areas of roads is also increasing. The increase of impermeable area leads to the increase of urban comprehensive runoff coefficient, the rapid confluence of rainstorm, the double increase of runoff volume and runoff peak value, and the excessive pressure of street drainage; the road pollutes the surrounding water seriously. In addition to heavy metals, hydrocarbons and other pollutants that are harmful to the environment, the rainwater runoff on the road surface contains oil and other pollutants brought by the operation of vehicles, waste discarded by pedestrians, debris washed from courtyards and other open grounds to the streets. debris and pollutants, etc., will eventually migrate to the water environment under the action of rainwater washing and scouring, and cause great harm to these waters; in addition, the demand for water in cities is increasing day by day, and traditional street drainage makes roads and surrounding areas The rainwater in the region flows away from the urban rainwater and sewage pipe network in vain, which not only wastes a lot of precious rainwater resources, but also makes the urban drainage pipe network, sewage treatment plant and water environment overwhelmed.

Contents of the invention

Purpose of the invention: The present invention provides an ecological street drainage structure, which can reduce road surface runoff and flood peak flow, and alleviate street drainage pressure; and solve the problem of street drainage, and at the same time, it can also reduce flood peak by uniformly collecting, filtering and purifying rainwater Flow rate, avoid polluted rainwater infiltration, and replenish groundwater sources.

Summary of the invention: An ecological street drainage structure, including roadways, curbs, rainwater planting ponds, pedestrian passages between planting ponds, and permeable paved sidewalks; the road surface for vehicles is made of dense asphalt concrete materials, and the lateral slope of the road surface is 2.5%; the curb has two openings at the rainwater planting pool, and there is a rainwater buffer zone between the curb and the rainwater planting pool to facilitate the rainwater to flow into the planting pool; the entrance of the rainwater planting pool is a stepped structure, allowing rainwater to flow in , forming a landscape of overlapping water; the bottom structure of the rainwater planting pool is planted soil layer, artificial filler layer, sand layer and gravel layer from top to bottom, and perforated pipes are buried in the gravel layer; sidewalks and pedestrian passages are paved with permeable pavement bricks, The structure of permeable pavement pavement from top to bottom is permeable brick surface layer, buffer layer, and gravel base layer; pavement base and cushion layer are provided with impermeable geotextiles for sidewalks and pedestrian passages, and the permeable surface layer at the edge of the sidewalk is connected to the impervious layer. There is a drainage pipe between the permeable geotextiles leading to the rainwater planting pond.

The stepped structure at the entrance of the rainwater planting pond is paved with basalt weirs.

In order to allow the water flow on the roadway to flow into the rainwater planting pond smoothly, the height of the side of the rainwater buffer zone close to the roadway is level with the roadway, and the side near the rainwater planting pond slopes downward to a certain slope.

Working principle: Since the roadway is an impermeable road surface, rainwater collects to the edge of the road through the lateral slope of the road, enters the rainwater buffer zone through the curb opening, and then enters the rainwater planting pool from the rainwater buffer zone; the sidewalk and pedestrian passage are paved with permeable pavement bricks The rainwater can infiltrate rapidly, and the infiltrated rainwater is discharged to the rainwater planting pond through the drainage pipe under the sidewalk surface. When the polluted rainwater flows into the stepped basalt weir at the entrance of the rainwater planting pond, a landscape of overlapping water is formed, and the speed of rainwater falling down is slowed down, so that the rainwater has sufficient time to infiltrate into the planting pond. Polluted rainwater is filtered and purified under the environment of vegetation, soil, etc., and the percolated rainwater is collected by perforated pipes in the bottom gravel layer into other drainage systems.

Beneficial effects: the street drainage structure of the present invention collects street rainwater into rainwater planting ponds to filter and infiltrate, purifies rainwater in a way that simulates nature, and collects and reuses rainwater.

Permeable pavement can effectively reduce pavement runoff and improve pavement water condition. Normally permeable pavement allows rainwater to infiltrate naturally. In order to prevent polluted rainwater from infiltrating and contaminating roadbed and groundwater sources, it is necessary to set up costly filtration and storage under the pavement structure. Water installations, etc. Compared with this, the present invention adopts a simpler and cheaper method, by arranging impermeable geotextiles between the pavement base layer and the cushion layer to prevent rainwater from penetrating into the base layer and continuing to infiltrate, and setting it under the permeable brick surface Drainage pipes that allow polluted stormwater that cannot infiltrate to pass into nearby stormwater planting ponds. In the invention, the drainage structures of the two road surfaces are well structured together, and the polluted rainwater is collected in one place for common treatment, which not only avoids the infiltration of sewage, but also saves costs.

Considering that in the street drainage structure of the present invention, the amount of flood peak rainwater imported by the rainwater planting pool is relatively large, the present invention allows the rainwater to flow in in stages by setting basalt weirs at the inflow of rainwater. With enough time to infiltrate, the overlapping water landscape is formed, which enhances the landscape vitality of the street.

Description of drawings

Fig. 1 is the plan view of ecological street drainage structure of the present invention;

Fig. 2 is an A-A sectional view of the ecological street drainage structure of the present invention.

detailed description

As shown in the figure, an ecological street drainage structure includes a roadway 1, a curb 2, a rainwater buffer zone 3, a rainwater planting pond 4, a sidewalk 5, a pedestrian passage 6 and a drainage pipe 7; the road surface of the roadway 1 The material is densely mixed asphalt concrete, and the lateral slope of the road surface is 2.5%. The curb 2 is set on both sides of the roadway 1. The width and height are both 150mm; there is a rainwater buffer zone 3 between the curb 2 and the rainwater planting pond 4, and the side of the rainwater buffer zone 3 close to the curb 2 is at the same height as the roadway 1, and the other side is sloped downwards. The slope is 20%; the stone steps 41 at the entrance of the rainwater planting pool 4 are paved with basalt weirs, allowing rainwater to flow in in stages to form a landscape of overlapping water; All adopt permeable pavement pavement 51, and a cushion is laid below the permeable pavement pavement 51, and an impermeable geotextile 52 is arranged between the gravel base and the cushion layer of the permeable pavement pavement 51 on the pavement 51 of the sidewalk 5 and the pedestrian passageway 6; The sidewalk 5 is provided with a drainage pipe 7 between the permeable pavement 51 and the impermeable geotextile 52, and the drainage pipe 7 is connected with the rainwater planting pool 4; the sidewalk 5 and the pedestrian passage 6 need to quickly eliminate road surface water and traffic load Fewer features, 200mm higher than roadway 1.

As shown in Figure 2, the permeable pavement pavement structure layers used for sidewalk 5 and pedestrian passage 6 are 60mm permeable brick surface layer, 30mm buffer layer, 150mm graded gravel base layer, permeable pavement pavement 51 and A 120mm lime soil cushion is laid below the impermeable geotextile 52 . The rainwater planting pool 4 includes stone steps 41, bark covering layer 42, vegetation and planting soil layer 43, artificial filler layer 44, sand layer 45 and gravel layer 46 from top to bottom. Its average thickness of bark cover layer 42 is 60mm; Vegetation and planting soil layer 43 are 250mm, plant perennial herbs; Artificial filler layer 44 is selected the stronger artificial material of permeability, and thickness is 600mm; Sand layer 45 thickness is 150mm; Gravel The layer 46 is composed of gravels with a diameter less than 50 mm and a thickness of 200 mm, and a perforated pipe 47 with a diameter of 80 mm can be buried. The area of the specific rainwater planting pond is mainly related to its effective capacity, the treated rainwater runoff and its permeability, which is determined by the specific situation.

Claims (7)

1. An ecological street drainage structure, comprising a roadway (1), a curb (2), a rainwater plantation pond (4), a sidewalk (5), a pedestrian passage (6) and a drainage pipe (7); The curb (2) is arranged on the side of the roadway (1), and the curb (2) is provided with openings at the rainwater planting ponds (4); the pedestrian passage (6) is arranged between the rainwater planting ponds (4) The drainage pipe (7) is buried under the sidewalk (5) and communicated with the rainwater planting pool (4); it is characterized in that: a stone step (41) is provided at the entrance of the upper end of the rainwater planting pool (4); rainwater planting The pool (4) consists of stone steps (41), bark covering layer (42), vegetation and planting soil layer (43), artificial filler layer (44), sand layer (45) and gravel layer (46) from top to bottom. ), the perforated pipe (47) is buried in the gravel layer (46). 2. The ecological street drainage structure according to claim 1, characterized in that: a rainwater buffer zone (3) is also provided between the curb (2) and the rainwater planting pond (4), and the rainwater buffer zone (3) For impermeable pavement. 3. The ecological street drainage structure according to claim 2, characterized in that: the rainwater buffer zone (3) is flush with the roadway (1) on the side near the curb (2), and is close to the rainwater planting pond ( 4) One side slopes down. 4. The ecological street drainage structure according to claim 1, characterized in that: the sidewalk (5) adopts permeable pavement pavement (51), and an impermeable geotextile is paved below the permeable pavement pavement (51) (52); the drainage pipe (7) is buried between the permeable pavement pavement (51) and the impermeable geotextile (52). 5. The ecological street drainage structure according to claim 1, characterized in that: the pedestrian passage (6) adopts permeable pavement pavement (51), and the pavement below the permeable pavement pavement (51) is paved with impermeable geotechnical Cloth (52). 6. The ecological street drainage structure according to claim 4 or 5, characterized in that: the sidewalk (5) and the pedestrian passage (6) are at the same height and are raised higher than the roadway (1), forming a height difference . 7. The ecological street drainage structure according to claim 4 or 5, characterized in that: the permeable pavement pavement (51) consists of a permeable brick surface layer, a buffer layer, and a gravel base layer in sequence from top to bottom.