CN202031005U - Ecological drainage channel - Google Patents

Abstract

The utility model discloses an ecological drainage ditch, which is distributed in a shallow saucer shape, is arranged between a non-motor vehicle lane and a motor vehicle lane, and includes a ditch body with a side slope. The direction of the bottom of the ditch is successively divided into a discharge area, a buffer zone and a seepage area. The cross-section of the ditch body is successively divided into a vegetation layer, a planting soil layer, a crushed stone layer and a pebble layer from top to bottom. The layers are separated by needle-punched geotextiles, and soft permeable pipes are arranged in the pebble layer. An overflow well is provided at intervals of 30m to 40m in the longitudinal direction of the ditch body. The upper opening of the overflow well is an overflow port, and the overflow port communicates with the drain pipe at the bottom of the overflow well. One side of the flow well communicates with the soft permeable pipe. The utility model has good initial rainwater treatment effect, strong rainwater impact load resistance, safe and reliable road drainage, and strong ecological and environmental protection effect.

Description

an ecological drainage ditch

technical field

The utility model relates to an ecological drainage facility for municipal roads, in particular to an ecological drainage ditch.

Background technique

Surface runoff from urban roads is the main component of non-point source pollution. Initial rainwater contains many pollutants such as suspended particles, organic pollutants, heavy metals, and oil substances, which have a serious impact on receiving water bodies. Among the existing drainage models, drainage pipes and ditch systems are the most commonly used, but they can only be used as rainwater collection systems. The initial rainwater generation road runoff is incorporated into pipes or ditches without treatment, and is directly discharged into receiving water bodies after being transported. It is easy to cause water pollution of the receiving water body, and flush the pipeline sediment into the water body, causing double pollution. Since the existing traditional drainage pipeline facilities cannot solve the pollution problem of initial rainwater, various ecological treatment measures have been derived, such as shallow grass ditch, green filter belt or waterfront buffer zone, etc. Asakusa ditch is generally arranged in a trapezoidal or shallow dish shape with a shallow depth. It can collect a certain amount of runoff and has a transport function. The rainwater first infiltrates as much as possible instead of being directly discharged into the downstream pipeline or receiving water body. It is an ecological type. Rainwater collection, transportation and purification systems are generally used on both sides of the expressway, but the infiltration of Qiancaogou rainwater may have adverse effects on the road subgrade, while other drainage measures have higher requirements on the road section, and some have a relatively narrow scope of use , there are certain hidden dangers of drainage safety.

Utility model content

The purpose of this utility model is to provide an ecological drainage ditch that overcomes the partial shortcomings of the above-mentioned ecological drainage measures, adopts the integration of drainage pipes and ecological ditch, integrates and optimizes the shallow grass ditch system and the pipeline system, and can meet The functional requirements of rainwater drainage and the ecological treatment requirements of road drainage can also solve the problem of water quality pollution caused by the path flow of the initial rainwater channel, with a wide range of applications and safe drainage.

The technical scheme that the utility model solves its technical problem adopts is:

An ecological drainage ditch, which is distributed in a shallow dish shape, is arranged between a non-motor vehicle lane and a motor vehicle lane, and includes a ditch body with a side slope. The bottom direction is divided into discharge area, buffer zone and seepage area in turn. The ditch body is composed of vegetation layer, planting soil layer, gravel layer and pebble layer from top to bottom. Soft permeable pipes are arranged in the pebble layer. , the soft permeable pipe communicates with the drainage pipe located below the ditch body.

The above-mentioned ecological drainage ditch, wherein, the thickness of the planting soil layer is 30cm to 80cm, the thickness of the crushed stone layer is 30cm, and the thickness of the pebble layer is 30cm, and each of the cross-sectional layers is separated by needle-punched geotextiles separate.

In the aforementioned ecological drainage ditch, the gravel layer is composed of gravel with a particle size of 5-40 mm.

The above-mentioned ecological drainage ditch, wherein, the slope of the discharge area includes a first slope and a second slope connected in sequence from top to bottom, and the tangent value of the inclination angle of the first slope is 1:20, The tangent value of the inclination angle of the second slope is 1:2, and the tangent value of the inclination angle of the vadose zone is 1:3.7.

The aforementioned ecological drainage ditch, wherein the inner diameter of the soft permeable pipe is 100 mm.

In the aforementioned ecological drainage ditch, the tangent value of the slope angle is 1:3.

The aforementioned ecological drainage ditch, wherein, needle-punched geotextiles are laid between the ditch body and the non-motorized roadway, and an anti-seepage geomembrane is laid between the ditch body and the motorized roadway.

The above-mentioned ecological drainage ditch, wherein, the ditch body is longitudinally provided with an overflow well every 30m to 40m, the upper opening of the overflow well is an overflow port, and the overflow port and the bottom of the overflow well The drainage pipe is connected, and one side of the overflow well is connected with the soft permeable pipe.

The utility model adopts a composite ecological drainage mode, which has good treatment effect on initial rainwater, strong ability to resist rainwater impact load, safe and reliable road drainage, and strong ecological and environmental protection effect.

Description of drawings

Fig. 1 is the cross-sectional structure schematic diagram of the utility model ecological drainage ditch;

Fig. 2 is a schematic diagram of the layout of the overflow well of the ecological drainage ditch of the present invention.

Detailed ways

The utility model will be further described below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the utility model.

Please refer to shown in Figure 1, the utility model ecological drainage ditch is arranged between the non-motor vehicle lane 2 and the motor vehicle lane 3, and is distributed in a shallow dish shape, including the ditch body 1 with the side slope 11, the tangent of the oblique angle of the side slope 11 The value is controlled at 1:3. Ditch body 1 includes ditch bottom 12, which is divided into discharge area A, buffer zone B and seepage area C successively from side slope 11 to ditch bottom 11. The effective water depth in the ditch is 30cm, and the ditch is safe. The super height is 30cm, and the maximum design water velocity is 0.8m/s. From top to bottom, the ditch body 1 consists of a vegetation layer 13, a planting soil layer 14 with a thickness of 30cm-80cm, a gravel layer 15 and a pebble layer 16 with a thickness of 30cm, wherein the gravel layer 15 has a particle size of 5-40mm gravel composition. The slope of the discharge area A includes the first slope and the second slope connected in sequence from top to bottom, corresponding to A1 and A2 of the discharge area A respectively, and the tangent value of the inclination angle of the first slope is 1:20 , the tangent of the slope of the second slope is 1:2, and the tangent of the slope of the vadose zone is 1:3.7. Needle-punched geotextiles 4 are used to separate each cross-section layer at intervals to prevent clogging, and soft permeable pipes 5 with an inner diameter of 100 mm are arranged in the pebble layer 16 to collect rainwater that seeps down. Needle-punched geotextiles 4 are also laid between the ditch body and the non-motorized driveway, anti-seepage geomembrane 6 is laid between the ditch body 1 and the motorized driveway 3, and drainage pipes 9 and soft permeable pipes 5 are laid below the ditch bottom 12. Communicate with drain pipe 9. Please refer to Fig. 2, the ditch body 1 is provided with an overflow well 7 every 30m to 40m in the longitudinal direction, and the upper opening of the overflow well 7 is an overflow port 71, and the overflow port 71 and the drainage pipe at the bottom of the overflow well 7 9 communicates, the overflow port 71 communicates with the ditch bottom 12, and one side of the overflow well 7 communicates with the soft permeable pipe 5.

Please refer to Figure 1 and Figure 2. When operating this ecological drainage ditch, it is specifically divided into three operating modes: initial rainfall, after formation of runoff in the ditch, and rainstorm runoff. In the early stage of rainfall, the amount of rainwater is small, but the pollution of rainwater is the most serious , the water quality is the worst, the SS (suspended solids) in the initial rainwater can be intercepted by the vegetation layer 13 and the planting soil layer 14 of the ditch body 1, organic matter, oil and other pollutants can be separated in the gravel layer 15 and pebble layer 16 Degradation, so as to realize the treatment of initial rainwater; after the formation of runoff in the ditch, with the increase of rainfall duration, the infiltration rate of rainwater in this ecological drainage ditch gradually stabilizes, and the rainwater discharged into the ditch gradually accumulates, and the runoff in the ditch begins to form. The rainwater runoff is discharged from high to low along the side slope 11 of the drainage ditch, and a water storage area 8 is generated at the bottom of the ditch 12; when the runoff is generated, the water quality is better because the rainfall has reached the middle and later stages. The scope of the water storage area 8 produced by the internal runoff continues to expand, and the water surface area gradually rises. When the water level exceeds the control elevation by 30cm, the rainwater can enter the well through the overflow port 71 of the overflow well 7 arranged at intervals in the ditch. And discharge through the drainage pipe 9 in the overflow well 7, thereby ensuring the safety of road drainage, and the excess rainwater infiltrated into the pebble layer 16 will also be discharged into the overflow well 7 through the soft permeable pipe 5, resulting in storm runoff When the overflow rainwater has the least impact on the receiving water body.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the patent scope of the present utility model. Therefore, all equivalent structural changes made by using the description and illustrations of the utility model are included in the utility model. within the scope of protection.

Claims (8)

1. An ecological drainage ditch, characterized in that it is distributed in a shallow dish shape, is arranged between a non-motor vehicle lane and a motor vehicle lane, and comprises a ditch body with a side slope, and the ditch body includes a ditch bottom, and is formed by the side slope The direction toward the bottom of the ditch is successively divided into a discharge area, a buffer zone and a seepage area, and the ditch body is successively composed of a vegetation layer, a planting soil layer, a gravel layer and a pebble layer from top to bottom, and the pebble layer is provided with A soft permeable pipe, the soft permeable pipe communicates with the drainage pipe below the ditch body. 2. The ecological drainage ditch according to claim 1, characterized in that, the thickness of the planting soil layer is 30cm to 80cm, the thickness of the gravel layer is 30cm, and the thickness of the pebble layer is 30cm, each of the cross-sections The layers are separated by needle-punched geotextiles. 3. The ecological drainage ditch according to claim 1 or 2, characterized in that the gravel layer is composed of gravel with a particle size of 5-40 mm. 4. The ecological drainage ditch according to claim 1, characterized in that, the slope of the discharge area comprises a first slope and a second slope connected in sequence from top to bottom, and the slope of the first slope The tangent of the slope is 1:20, the tangent of the slope of the second slope is 1:2, and the tangent of the slope of the vadose zone is 1:3.7. 5. The ecological drainage ditch according to claim 1, characterized in that, the inner diameter of the soft permeable pipe is 100mm. 6. The ecological drainage ditch according to claim 1, characterized in that, the tangent value of the slope angle is 1:3. 7. The ecological drainage ditch according to claim 1, characterized in that a needle-punched geotextile is laid between the ditch body and the non-motor vehicle road, and an anti-seepage geomembrane is laid between the ditch body and the motor vehicle road. 8. The ecological drainage ditch according to claim 1, characterized in that, the ditch body is longitudinally provided with an overflow well every 30m to 40m, the upper opening of the overflow well is an overflow port, and the overflow The outlet is in communication with the drainage pipe at the bottom of the overflow well, and one side of the overflow well is in communication with the soft permeable pipe.

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