CN206157878U - Biological stagnant water pond system in sponge city - Google Patents

Abstract

The utility model discloses a biological stagnant pool system for a sponge city, comprising: a rainwater filtration system, including an ecological stagnant pool, HDPE film layers are respectively laid on the base and the inner side of the slope, and a drainage layer, transition layer, filter layer and landscape layer; the drainage layer is provided with several first drainage pipes and first rainwater pipes laid side by side on the HDPE film layer; rainwater collection system, which includes an overflow well and is connected to the overflow well through a second rainwater pipe The water collection well; the water collection well is provided with a second drainage pipe for outward drainage; the height of the wellhead of the overflow well is higher than the height of the landscape layer in the ecological stagnant pond; the first drainage pipe is a perforated pipe, and one end of the first rainwater pipe is connected to the first The other end of the drain pipe extends into the overflow well. The biological stagnant pool system provided by the utility model has functions similar to "sponge" such as collecting rainwater, infiltrating, storing water, and replenishing rainwater, and can also beautify the environment.

Description

Bioretention pond system for sponge city

technical field

The utility model relates to the technical field of biological stagnant ponds, more specifically, the utility model relates to a biological stagnant pond system for a sponge city.

Background technique

In the existing technology, the urban rainwater collection system usually adopts the excavation-fill fast-drainage mode. In some cities, the rainwater runoff is directly discharged to the river without any treatment. The rainwater polluted runoff directly entering the river will form a pollution impact load, causing the urban landscape river to burst in the flood season. The deterioration of water quality is also not conducive to rainwater collection and supply during drought.

With the increasingly severe modern environment, people pay more and more attention to environmental protection, and the concept of sponge city was put forward. Sponge city is a new generation of urban stormwater management concept. It refers to the city's good "elasticity" in adapting to environmental changes and responding to natural disasters caused by rainwater. It can also be called "water elastic city". The construction of "sponge city" has been proposed as a national strategy, changing the traditional situation of extensive urban development in the past, but building a sponge city with natural accumulation, natural infiltration, and natural purification functions.

Utility model content

Aiming at the deficiencies in the above technologies, the utility model provides a biological stagnant pond system for a sponge city, which has functions similar to "sponge" such as collecting rainwater, infiltrating, storing water, and replenishing rainwater, and can also beautify the environment.

In order to achieve these purposes and other advantages according to the utility model, the utility model is realized through the following technical solutions:

The utility model provides a biological stagnant pool system for a sponge city, comprising:

The rainwater filtration system includes an ecological stagnant pond, the base of the ecological stagnant pond and the inner side of the slope are respectively laid with HDPE film layers, and the HDPE film layers of the base are sequentially laid with a drainage layer, a transition layer, a filter layer and a landscape layer; the drainage layer is provided with several first drainage pipes laid side by side on the HDPE film layer and several first rainwater pipes arranged side by side;

A rainwater collection system, which includes an overflow well and a water collection well connected to the overflow well through a second rainwater pipe; the water collection well is provided with a second drainage pipe for outward drainage;

Wherein, the overflow well is a trapezoidal cavity with a small top and a large bottom; the wellhead height of the overflow well is equal to the height of the landscape layer in the ecological stagnant pool;

The first drainage pipe is a perforated pipe, one end of the first rainwater pipe communicates with the first drainage pipe, and the other end extends into the overflow well.

Preferably, a compacted sand leveling layer is provided between the base and the inner side of the slope and the HDPE film layer respectively; the degree of compaction is greater than 87%; the flatness of the sand leveling layer satisfies ±2cm /m ² .

Preferably, the slope of the ecological stagnant pond is 1:3.

Preferably, a reinforcement layer around the well is provided around the overflow well, and the reinforcement layer around the well is concrete mixed with steel bars, and the thickness of the concrete is not less than 20cm.

Preferably, the drainage layer has fine gravel wrapping the first drainage pipe;

The transition layer is laid with compacted medium-coarse sand;

The filter layer is provided with planting soil that matches the plants planted in the landscape layer;

Wherein, the diameter of the fine gravel is 2.0-3.5mm;

The distance between the first drainage pipe and the HDPE film layer is 20-30cm;

The medium-coarse sand has a thickness of 10 cm and a diameter of 0.5-1.5 mm.

Preferably, the hole diameter of the first drainage pipe is less than 2 mm, and a geotextile layer is arranged between the outer side of the first drainage pipe and the fine gravel.

Preferably, the distance between the two first drainage pipes closest to the toe of the slope during laying side by side is 40 cm; the distance between the two ends of each of the first drainage pipes and the toe of the slope is 1 m.

Preferably, the height distance between the first rainwater pipe and the HDPE film layer is 20-30cm.

Preferably, the first rainwater pipe is matched with the first drainage pipe one by one; one end of the first rainwater pipe communicates with one of the first drainage pipes, and the other end extends into the overflow well.

Preferably, one end of each first rainwater pipe communicates with several first drainage pipes, and the other end extends into the overflow well.

The utility model at least includes the following beneficial effects:

1) In the biological stagnant pond system provided by the utility model, HDPE film layer, drainage layer, transition layer, filter layer and landscape layer are successively laid in the ecological stagnant pond of the rainwater filtration system; the first drainage pipe of the drainage layer is connected through the first rainwater pipe To the overflow well of the rainwater collection system, the rainwater in the overflow well exceeds a certain water level and flows to the water collection well for storage through the second rainwater pipe, and the water stored in the water collection well exceeds a certain water level to be discharged; thus forming a system of rainwater collection, infiltration, water storage, and replenishment The integration of rainwater and landscaping is similar to the "sponge" body function;

2) HDPE (High Density Polyethylene Impermeable membrane) membrane has good anti-corrosion performance, electrical performance, moisture-proof performance, anti-leakage performance, impact resistance, high tensile strength, and is used for anti-seepage of ecological stagnant pools;

3) The overflow well is a trapezoidal cavity with a small top and a large bottom. The height of the wellhead of the overflow well is equal to the height of the landscape layer in the ecological stagnant pool; ; On the other hand, when the rainwater is larger than the storage capacity of the biological stagnation pool, it can be quickly discharged into the overflow well through the overflow wellhead;

4) There is a compacted sand leveling layer between the base and the inner side of the slope and the HDPE film layer, the degree of compaction is greater than 87%, and the flatness of the sand leveling layer meets ± ^2cm /m2; the compacted sand leveling layer is HDPE Lay the foundation for the flat laying of the membrane;

5) The grading slope of the ecological stagnant pond is 1:3, which ensures that the rainwater can flow downstream to the ecological stagnant pond and at the same time ensures the construction safety of the ecological stagnant pond;

6) The drainage layer has fine gravel wrapping the first drainage pipe, and the surface of the fine gravel is smooth, so that the sand in the sand leveling layer is in direct contact with the first drainage pipe;

7) The distance between the first drainage pipe and the HDPE film layer is 20-30cm, ensuring that at least 20-30cm of water can be stored;

8) The first drainage pipe is a perforated pipe, and the diameter of the perforated pipe is less than 2mm. A geotextile layer is arranged between the outside of the first drainage pipe and the fine gravel to prevent the first drainage pipe from being blocked.

Other advantages, objectives and features of the utility model will partly be embodied through the following description, and partly will be understood by those skilled in the art through the research and practice of the utility model.

Description of drawings

Fig. 1 is the sectional structure schematic diagram of the biological stagnant pond system of the sponge city described in the utility model;

Fig. 2 is an example of the relative positions of the first drainage pipe and the first rainwater pipe in the top sectional view of Fig. 1;

Fig. 3 is another example of the relative positions of the first drainage pipe and the first rainwater pipe in the top sectional view of Fig. 1 .

In the picture:

100 - rainwater filtration system;

10- Ecological stagnant pool;

11-base; 12-slope; 13-HDPE film layer;

14 - drainage layer;

141-the first drainage pipe; 142-the first rainwater pipe; 143-geotextile layer;

15-transition layer; 16-filter layer; 17-landscape layer; 18-sand leveling layer;

20 - overflow well;

21 - the second rainwater pipe;

200 - rainwater harvesting system;

30-collecting well; 31-the second drainage pipe.

detailed description

The utility model will be described in further detail below in conjunction with the accompanying drawings, so that those skilled in the art can implement it by referring to the description.

It should be understood that terms such as "having", "comprising" and "including" as used herein do not entail the presence or addition of one or more other elements or combinations thereof.

As shown in Figures 1 to 3, the utility model provides a biological stagnant pond system for a sponge city, including:

The rainwater filtration system 100 comprises an ecological stagnant pond 10, the base 11 and the inner side of the slope 12 of the ecological stagnant pond 10 are respectively laid with HDPE film layers 13, and the HDPE film layer 13 of the substrate 11 is successively laid with a drainage layer 14, a transition layer 15, The filter layer 16 and the landscape layer 17; the drainage layer 14 is provided with several first drainage pipes 141 laid side by side on the HDPE film layer 13 and several first rainwater pipes 142 arranged side by side;

Rainwater collecting system 200, it comprises overflow well 20 and is connected to the sump well 30 of overflow well 20 by the second rainwater pipe 21; The sump well 30 is provided with the second drainage pipe 31 of outward drainage;

Wherein, the overflow well 20 is a trapezoidal cavity with a small top and a large bottom; the wellhead height of the overflow well 20 is equal to the height of the landscape layer 17 in the ecological stagnant pool 10;

The first drain pipe 141 is a perforated pipe, one end of the first rainwater pipe 142 is connected to the first drain pipe 141 , and the other end extends into the overflow well 20 .

In the above-mentioned embodiment, the rainwater of the sponge city enters into the drainage layer 14 through the filtration of the landscape layer 17, the filter layer 16, and the transition layer 15 in sequence; The first rainwater pipe 142 communicated with the first drainpipe 141 enters in the overflow well 20, and the rainwater of the overflow well 20 further enters the water collection well 30 by the second rainwater pipe 21; 31, then the rainwater is discharged by the sump 30. It can be seen that the biological stagnant pond system provided by this embodiment has functions similar to a "sponge" body such as collecting rainwater, infiltrating, storing water, and replenishing rainwater, and can also plant plants through the landscape layer 17 to beautify the environment.

In the above embodiment, the HDPE film laid by the HDPE film layer 13 has good anti-corrosion properties, electrical properties, moisture-proof properties, anti-leakage properties, impact resistance, high tensile strength, and is used for the anti-seepage of the ecological stagnant pond 10 . The laying of HDPE film avoids wrinkles and ripples. When laying, sandbags should be used to press down the aligned and aligned HDPE film in time to prevent wind blowing.

In the above-mentioned embodiment, the overflow well 20 is a trapezoidal cavity with a small top and a large bottom, and the height of the wellhead of the overflow well 20 is equal to the height of the landscape layer 17 in the ecological stagnant pond 10; Filtration and purification enter the overflow well 20; on the other hand, when the rainwater exceeds the storage capacity of the biological stagnation pool 10, it can be quickly discharged into the overflow well 20 through the wellhead of the overflow well 20.

In the above embodiment, a compacted sand leveling layer 18 is provided between the inner side of the base 11 and the slope 12 and the HDPE film layer 13 respectively. Small-sized road rollers (not less than 2t) can be used for compaction, and the compaction degree is greater than 87%; the flatness of the sand screed layer 18 satisfies ±2cm/m ² . The base 11 should be clean, without sundries and stagnant water, and the cleanliness should meet the vertical depth of 2.5cm. There should be no sharp-edged sundries such as tree roots, rubble, and stones. The slope shall be inspected with a horizontal ruler, and the slope shall be clean and dry without debris. After the base 11 and the inside of the slope 12 are cleaned, compacted and leveled, the HDPE film can be laid.

In the above embodiment, before the excavation of the biological stagnant pond 10, a total station should be used to fix the points, the four corners should be fixed, and the irregularities should be encrypted. Then sprinkle the thread with lime, and the thread trace is clear and clear at a glance. It is necessary to ensure that the line is beautiful and smooth, so that the biological stagnation pool 10 is seamlessly connected with the surrounding terrain or roads, so as to ensure the inflow of rainwater. The biological stagnant pond 10 adopts an excavator to carry out earthwork excavation. The excavation line should be smooth and beautiful, and it should be connected with the surrounding terrain to ensure that rainwater can flow downstream into the ecological stagnant pond 10 . Excavator excavation can adopt 90-degree vertical excavation, but the construction is difficult and prone to landslides, posing safety hazards. In order to facilitate construction and reduce potential safety hazards, this embodiment uses a 1:3 slope for grading.

In the above embodiment, the inside and outside of the overflow well 20 is painted with 1:3 cement mortar, and there should be no hollowing and the surface should be smooth. The well circumference of the overflow well 20 is compacted with a plate compactor to prevent the surroundings from subsidence. In order to ensure the compaction effect, preferably, a reinforcement layer around the overflow well 20 (not shown in the figure) is provided. The reinforcement layer around the well is concrete mixed with steel bars, and the thickness of the concrete is not less than 20cm. As a further preference, 8-round double-layer steel bars are mixed in the concrete to further reinforce the well circumference and prevent subsidence.

In the above-described embodiment, the drainage layer 14 has fine gravels that wrap the first drainage pipe 141 (not shown in the figure); the thickness of the drainage layer 14 is 20cm, and the diameter of the fine gravels is 2.0-3.5mm; the surface of the fine gravels is smooth, so that the sand The sand in the leveling layer 18 is in direct contact with the first drainage pipe 141 .

The transition layer 15 is laid with compacted medium-coarse sand; the thickness of the transition layer 15 is 10 cm, and the diameter of the medium-coarse sand is 0.5-1.5 mm. The transition layer 15 is compacted as much as possible to achieve a better filtering effect; the compactness of the transition layer 15 can be improved by sprinkling water on the medium-coarse sand.

The filter layer 16 is provided with planting soil that matches the planting plants in the landscape layer. The thickness of the planting soil is 40cm. Generally, the excavated soil is used for improvement to reduce ecological damage, and the planting soil should meet the requirements of the plants to be planted in the landscape layer 17. demand.

Planting plants in the landscape layer 17 should be combined with landscape requirements, and choose plants that are beautiful, flood-resistant, and have strong decontamination capabilities. As a preference, the landscape layer 17 can be planted with a variety of plants to form a patch ecology, which is not only beautiful, but also plays a good role in regulating the ecological balance.

In the above embodiment, the distance between the two first drainage pipes 141 closest to the toe of the slope during laying side by side is 40 cm; the distance between the two ends of each first drainage pipe 141 and the toe of the slope is 1 m. The aperture of the first drainage pipe is less than 2mm, which is easy to be blocked. In order to ensure that the first drainage pipe 141 is not blocked, a geotextile layer 143 is provided between the outer side of the first drainage pipe 141 and the fine gravel. The geotextile of the geotextile layer 144 is wrapped around the first drainage pipe 141 to further filter the surrounding of the first drainage pipe 141 .

In the above embodiment, in order to ensure that the rainwater flows smoothly into the ecological stagnation pool 10, the overflow well 20 and the water collection well 30, the integration of rainwater collection, infiltration, water storage, and later replenishment is similar to a "sponge" body function; In the vertical direction, the first drainage pipe 141 laid side by side on the HDPE film layer 13 is flush with the first rainwater pipe 142, and the second rainwater pipe 21 is higher than the first rainwater pipe 142, so that the overflow well 20 has a certain water storage capacity. The second drainage pipe 31 is higher than the second rainwater pipe 21, so that the water collection well 30 has a certain water storage function; the height of the second drainage pipe 31 is slightly lower than the height of the landscape layer 17 relative to the biological stagnant pond, so that under the drought situation, The water stored in the water collection well 30 can be discharged into the filter layer 16 below the landscape layer 17 by the second drain pipe 31 to supply water for the landscape layer 17 . Preferably, the height distance between the first rainwater pipe 141 and the HDPE film layer 13 is 20-30 cm, which is used to ensure that the biological stagnation tank 10 can store water of 20-30 cm.

As a specific embodiment of the present utility model, the first drainage pipe 141 is several arranged in parallel on the drainage layer 14, and the first rainwater pipe 142 is matched with the first drainage pipe 141 one by one; one end of a first rainwater pipe 142 is connected to a first A drain pipe 141 extends into the overflow well 20 at the other end. Each first drain pipe 141 is connected with a corresponding first rainwater pipe 142 , which ensures the drainage efficiency of each first drain pipe 141 .

As another specific embodiment of the present utility model, the first drainage pipes 141 are several arranged in parallel on the drainage layer 14, and there are several first rainwater pipes 142; one end of each first rainwater pipe 142 is connected to several first drainage pipes. The other end of the pipe 141 extends into the overflow well 20 . One end of a first rainwater pipe 142 communicates with several first drainpipes 141, and there are several first rainwater pipes 142, which ensures that when one or more of the first rainwater pipes 141 and the first rainwater pipes 142 are blocked or fail to pass water , the rainwater can flow to the overflow well 20 through the other first drain pipe 141 and the other first rainwater pipe 142 .

Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and implementation. It can be applied to various fields suitable for the utility model. Additional modifications can be readily effected by those skilled in the art. Therefore, the invention should not be limited to the specific details and examples shown and described herein, without departing from the general concept defined by the claims and their equivalents.

Claims (10)

1. the biological backwater cell system in a kind of sponge city, it is characterised in that include：

Dmp filter system, it includes ecological stagnant pool, and the substrate of the ecological stagnant pool and slope inner side are equipped with respectively HDPE film layer, on the HDPE film layer of the substrate drainage blanket, transition zone, filter layer and landscape layer are equipped with successively；Institute State drainage blanket and be provided with the first drainpipe that several are laid on side by side on the HDPE film layer and several are set up in parallel One rain pipe；

Rain water collecting system, it includes overflow well and is connected to the sump of the overflow well by the second rain pipe；It is described Sump is provided with the second drainpipe of outside draining；

Wherein, the overflow well is up-small and down-big trapezoidal cavity volume；The well head of the overflow well highly exists equal to the landscape layer Height in the ecological stagnant pool；

First drainpipe is perforated pipe, and described first rain pipe one end connects first drainpipe, the other end and extends to In the overflow well.

2. the biological backwater cell system in sponge city as claimed in claim 1, it is characterised in that the substrate and the slope Inner side is provided with respectively the husky screed-coat of compacting between the HDPE film layer；

The compactness is more than 87%；Flatness satisfaction ± the 2cm/m of the husky screed-coat²。

3. the biological backwater cell system in sponge city as claimed in claim 1, it is characterised in that the ecological stagnant pool is put The slope gradient is 1:3.

4. the biological backwater cell system in sponge city as claimed in claim 1, it is characterised in that be provided with around the overflow well The all back-up coats of well, the well week back-up coat is the concrete mixed with reinforcing bar, and the thickness of the concrete is not less than 20cm.

5. the biological backwater cell system in sponge city as claimed in claim 1, it is characterised in that

The drainage blanket has the granule of parcel first drainpipe；

The transition zone is equipped with the medium coarse sand of compacting；

The filter layer is provided with the planting soil matched with the landscape layer planting plants；

Wherein, a diameter of 2.0-3.5mm of the granule；

The distance between first drainpipe and described HDPE film layer are 20-30cm；

The thickness of the medium coarse sand is 10cm, a diameter of 0.5-1.5mm.

6. the biological backwater cell system in sponge city as claimed in claim 5, it is characterised in that the hole of first drainpipe Footpath is less than 2mm, and between the outside of first drainpipe and the granule geotechnological layer of cloth is provided with.

7. the biological backwater cell system in sponge city as claimed in claim 1, it is characterised in that side by side near slope in laying Two first drainpipes of pin are respectively 40cm with the distance of toe；The two ends of each first drainpipe respectively with slope The distance of pin is 1m.

8. the biological backwater cell system in sponge city as claimed in claim 1, it is characterised in that first rain pipe and institute It is 20-30cm to state the height distance between HDPE film layer.

9. the biological backwater cell system in the sponge city as any one of claim 1-8, it is characterised in that described first Rain pipe is matched one by one with first drainpipe；Described first rain pipe one end connects first drainpipe, another End is extended in the overflow well.

10. the biological backwater cell system in the sponge city as any one of claim 1-8, it is characterised in that each institute The one end for stating the first rain pipe connects several described first drainpipes, the other end and extends in the overflow well.