An ecological tree-pit system for intercepting stormwater runoff pollutants

Abstract

The present application relates to a kind of ecological tree pool systems of intercepting rainwater surface runoff pollutants, including prefabricated ecological tree pool, prefabricated ecological tree pool is sequentially provided with water storage pool, intercepting pool and purification pool from outside to inside, first pool wall is provided between water storage pool and intercepting pool, the bottom of first pool wall is provided with filter grid, filter grid is connected with water storage pool and intercepting pool;Intercepting pool and purification pool are provided with second pool wall, and multiple overflow holes are provided in second pool wall from bottom to top, and overflow hole is connected with intercepting pool and purification pool;First pool wall is lower than the pool wall of prefabricated ecological tree pool, and second pool wall is lower than first pool wall.The present application is by undercurrent type structure, makes rainwater flow along specific route, and purification effect is good, can effectively intercept various pollutants, belongs to the technical field of ecological tree pool.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ecological tree pool, and particularly relates to an ecological tree pool system for intercepting rainwater surface runoff pollutants. BACKGROUND

[0002] In recent years, with the rapid advancement of urbanization, large-area hardening pavement and the lagging problem of underground infrastructure construction have become increasingly prominent, leading to a series of prominent problems in cities, such as the impermeable hardening pavement that causes rainwater to collect on the ground, greatly increasing urban waterlogging; and the rainwater that is blocked from supplementing groundwater, making it difficult for the urban groundwater level to recover, directly affecting the health of vegetation and aggravating the pollution of water environment by pollutants carried by surface runoff.

[0003] At present, relevant patent technologies have been formed in the treatment of surface runoff pollution, for example, a Chinese patent with the patent number CN108951816A discloses an ecological tree pool system and a construction method, which can collect rainwater during rainfall and prevent water and soil loss in the cultivation of street trees, overcoming the drawbacks in the cultivation and management of street trees. A Chinese patent with the patent number CN107447808A discloses a rainwater collection and purification ecological tree pool, which can effectively solve the problems of rainwater collection, purification and storage. However, the above-mentioned patents have general purification effect of rainwater and lack interception and removal of TN, TP and heavy metal elements in runoff pollutants, and cannot provide a simple and rapid construction scheme. SUMMARY

[0004] In view of the technical problems in the prior art, the purpose of the present application is to provide an ecological tree pool system for intercepting rainwater surface runoff pollutants, which has good purification effect and can effectively intercept various pollutants.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0006] The ecological tree pool system for intercepting rainwater surface runoff pollutants comprises a prefabricated ecological tree pool, which is provided with a water storage pool, an interception pool and a purification pool from outside to inside. A first pool wall is arranged between the water storage pool and the interception pool, the bottom of the first pool wall is provided with a filter grid, and the filter grid is communicated with the water storage pool and the interception pool. A second pool wall is arranged between the interception pool and the purification pool, the second pool wall is provided with a plurality of overflow holes from the bottom to the top, and the overflow holes are communicated with the interception pool and the purification pool. The first pool wall is lower than the pool wall of the prefabricated ecological tree pool, and the second pool wall is lower than the first pool wall.

[0007] As a preferred, the bottom of the prefabricated ecological tree pool is provided with a water storage pool, the water storage pool is located below the water storage pool, the interception pool and the purification pool, and the purification pool is provided with a drainage port communicated with the water storage pool. A water-permeable membrane is arranged above the drainage port, the water-permeable membrane is provided with a through hole, and the through hole is arranged corresponding to the drainage port.

[0008] As a kind of preferred, the top of the purification tank is provided with a planting part, and the planting part includes a plant planting area and a microorganism planting area, and the microorganism planting area is distributed around the plant planting area.

[0009] As a kind of preferred, the prefabricated ecological tree pool is prepared by using ecological concrete, and the prefabricated ecological tree pool has a cylindrical structure.

[0010] As a kind of preferred, the water storage tank has an inverted triangular structure, and the water storage tank is provided with a barrier net, and the two end edges of the barrier net are connected with the top of the pool wall and the first pool wall of the prefabricated ecological tree pool, respectively.

[0011] As a kind of preferred, the interception tank has a cylindrical structure, and the overflow holes are circular holes, and the overflow holes are uniformly distributed on the second pool wall.

[0012] As a kind of preferred, the interception tank is provided with a gravel layer, a sand layer and a pebble layer, and the gravel layer, the sand layer and the pebble layer are sequentially distributed from bottom to top in the interception tank.

[0013] As a kind of preferred, the particle size of the gravel in the gravel layer is 20-30mm, the particle size of the sand in the sand layer is 1mm, and the particle size of the pebble in the pebble layer is 30-50mm.

[0014] As a kind of preferred, the purification tank is provided with a pebble layer, a sand layer and a gravel layer, and the pebble layer, the sand layer and the gravel layer are sequentially distributed from bottom to top in the purification tank.

[0015] As a kind of preferred, the particle size of the pebble in the pebble layer is 30-50mm, the particle size of the sand in the sand layer is 1mm, and the particle size of the gravel in the gravel layer is 20-30mm.

[0016] The principle of the present application is that it is suitable for sponge city construction and low-impact development and reconstruction of old communities, can effectively intercept surface runoff pollutants, and thus achieve the concept and requirements of "storage, purification, use and discharge" of sponge city construction. The device comprises a prefabricated ecological tree pool, a water storage tank, an interception tank, a filter tank and a water storage tank. The prefabricated ecological tree pool is prefabricated from ecological concrete, which can be quickly installed and used in construction, effectively solving the problem of rainwater infiltration into the ground. The interception tank and the filter tank are the filtration system in the ecological tree pool system, which is a subsurface flow type. By selecting the filler material and matching different particle sizes, a pollution interception matrix can be constructed to increase the runoff flow path and intercept pollutants, especially TN, TP, ammonia nitrogen and heavy metal pollutants. At the same time, overflow ports and drainage holes are provided to achieve the purpose of fast drainage. The water storage tank can effectively collect rainwater to achieve the purpose of fast drainage, and the water storage tank can achieve the purpose of rainwater reuse.

[0017] Overall, the present application has the following advantages:

[0018] 1. The present application has good purification effect, can effectively intercept surface runoff pollutants, so as to achieve the concept and requirement of "storage, purification, use and discharge" of sponge city construction. The surface runoff pollution is solved, the runoff pollution is intercepted into the rainwater pipe, the prefabricated ecological tree pool is put into the treated foundation pit, the filler in the filter system is added in turn, and the shrubs are planted. The ecological tree pool is prefabricated from ecological concrete, which effectively speeds up the installation and construction progress on site, and the integrated ecological tree pool also reduces the seepage of rainwater during rainfall. Through the design of the subsurface flow type filter structure, the pollutant interception matrix is constructed by selecting the filler material and different particle sizes, the runoff flow path is increased, and the effect of intercepting pollutants is achieved.

[0019] 2. The present application is prefabricated from ecological concrete, which is simple to construct and can be quickly installed and used. At the same time, the overall prefabrication can effectively reduce the structural construction joints and reduce the problem of runoff seepage.

[0020] 3. The filter system in the present application is of subsurface flow type, which can increase the runoff movement path. At the same time, filling different particle size fillers can intercept runoff pollutants.

[0021] 4. The purification tank in the present application provides space for the growth of plants and microorganisms, which can effectively purify TN, TP, heavy metals and other pollutants in runoff pollutants.

[0022] 5. The water storage tank in the present application can store rainwater when the rainfall is large, and achieve the purpose of rainwater reuse in the later period. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a schematic diagram of an ecological tree pool system for intercepting rainwater surface runoff pollutants.

[0024] Figure 2 It is a top view of an ecological tree pool system for intercepting rainwater surface runoff pollutants.

[0025] Figure 3 It is a schematic diagram of a water storage tank.

[0026] Figure 4 It is a schematic diagram of an interception tank.

[0027] Figure 5 It is a schematic diagram of a purification tank.

[0028] Among them, 1 is a prefabricated ecological tree pool, 2 is a water storage tank, 3 is an interception tank, 4 is a purification tank, 5 is a water storage tank, 6 is a planting part, 7 is a shrub, 8 is a filter grid, 9 is an interception net, 10 is an overflow hole, 11 is a drainage port, 12 is a first tank wall, 13 is a second tank wall, 14 is a gravel layer, 15 is a pebble layer, 16 is a sand layer, and 17 is a water permeable membrane. DETAILED DESCRIPTION

[0029] The application will be further described in detail below in conjunction with the specific embodiments.

[0030] The ecological tree pool system for intercepting rainwater surface runoff pollutants comprises a prefabricated ecological tree pool, which is sequentially provided with a water storage pool, an interception pool and a purification pool from outside to inside, a first pool wall is arranged between the water storage pool and the interception pool, a filter grid is arranged at the bottom of the first pool wall, and the filter grid is communicated with the water storage pool and the interception pool; a second pool wall is arranged between the interception pool and the purification pool, the second pool wall is provided with a plurality of overflow holes from the bottom to the top, and the overflow holes are communicated with the interception pool and the purification pool; the first pool wall is lower than the pool wall of the prefabricated ecological tree pool, and the second pool wall is lower than the first pool wall.

[0031] The water storage pool, the interception pool and the purification pool of the embodiment form a circular truncated cone with a trapezoidal cross section in the vertical direction, the area between the circular truncated cone and the prefabricated ecological tree pool is a water storage pool, the circular truncated cone is arranged in an inverted manner, the end with a large diameter is the top, and the end with a small diameter is the bottom, and the circular truncated cone has a horn mouth shape.

[0032] The prefabricated ecological tree pool of the embodiment has an outer diameter of 1200 mm and a height of 1000 mm, and the wall thickness of the ecological concrete material is 30 mm. The prefabricated ecological tree pool, the water storage pool, the interception pool and the purification pool are integrally arranged, so that the installation and construction are more convenient, the overall prefabrication can effectively reduce the structural construction joints, and the problem of runoff leakage to the outside is reduced.

[0033] The bottom of the prefabricated ecological tree pool is provided with a water storage pool, the water storage pool is located below the water storage pool, the interception pool and the purification pool, the purification pool is provided with a drainage opening communicated with the water storage pool; a water-permeable membrane is arranged above the drainage opening, the water-permeable membrane is provided with a through hole, and the through hole is arranged in correspondence with the drainage opening. The water storage pool can store rainwater when the rainfall is large, and can also play a role in rainwater reuse when the dry season comes, so that the shrubs will not dry up. The 30 μm water-permeable membrane effectively intercepts the growth of roots, the diameter of the through hole is between 25-30 mm, and the through hole is uniformly distributed on the bottom plate of the purification pool 9, so as to achieve the purpose of rapid drainage.

[0034] The top of the purification pool is provided with a planting part, the planting part comprises a plant planting area and a microorganism planting area, and the microorganism planting area is distributed around the plant planting area. The plant planting area is a shrub planting place, and through the filling of the filler and the planting of the plants and microorganisms, the pollutants in the runoff, especially the TN, TP, ammonia nitrogen and heavy metal pollutants in the surface, can be effectively purified.

[0035] The prefabricated ecological tree pool is prepared by using ecological concrete, and the prefabricated ecological tree pool has a cylindrical structure. The installation and construction are convenient, and at the same time, the overall prefabrication can effectively reduce the structural construction joints and reduce the problem of runoff leakage to the outside.

[0036] The water storage pool is in an inverted triangular structure, the top of the water storage pool is provided with a barrier net, and the two end edges of the barrier net are connected with the pool wall of the prefabricated ecological tree pool and the top of the first pool wall respectively. The vertical section of the water storage pool is in a triangular structure, the inclined edge pool wall is inclined from the top of the pool wall of the prefabricated ecological tree pool to the middle of the prefabricated ecological tree pool, and the direction is from the upper outside to the lower inside; the short edge pool wall is vertically arranged to form the first pool wall, and the other short edge pool wall is formed by the barrier net, the barrier net is arranged at the top, so that the pollutants with large volume are intercepted; the bottom is provided with a filter grid to intercept the pollutants with small volume. The distance between the top of the pool wall of the prefabricated ecological tree pool and the top of the first pool wall is 300 mm, and the overall height of the first pool wall is 600 mm. The barrier net and the filter grid can effectively intercept the large-particle pollutants such as branches and leaves. When the rainfall is large, the water storage pool can collect rainwater first, thereby reducing the problem of ground waterlogging.

[0037] The interception pool is in a cylindrical structure, the overflow holes are circular holes, and the overflow holes are uniformly distributed on the second pool wall. When the rainfall runoff is small, the overflow holes of the interception pool flow to the purification pool, so that the pollutants are purified. The interception pool 8 is 100 mm wide and 550 mm high.

[0038] The interception pool is provided with a gravel layer, a sand layer and a pebble layer, and the gravel layer, the sand layer and the pebble layer are sequentially distributed from bottom to top in the interception pool.

[0039] The particle size of the gravel in the gravel layer is 20-30 mm, the particle size of the sand in the sand layer is 1 mm, and the particle size of the pebble in the pebble layer is 30-50 mm.

[0040] The purification pool is provided with a pebble layer, a sand layer and a gravel layer, and the pebble layer, the sand layer and the gravel layer are sequentially distributed from bottom to top in the purification pool. The bottom of the purification pool is 400 mm in diameter and 550 mm in height.

[0041] The particle size of the pebble in the pebble layer is 30-50 mm, the particle size of the sand in the sand layer is 1 mm, and the particle size of the gravel in the gravel layer is 20-30 mm.

[0042] By selecting the material quality of the purification pool and the interception pool, and matching different particle sizes to construct the pollutant interception matrix, the runoff flow path is increased, the pollutants are intercepted, and the problem of urban surface runoff pollution is reduced.

[0043] The implementation process is as follows:

[0044] Step one: according to the construction site conditions and the size requirements of the ecological system, the measurement and line laying and the foundation pit excavation are well done.

[0045] Step two: the bottom of the foundation pit is well treated, the gravel with a thickness of 100-150 mm is filled and tamped, or a layer of plain concrete with a thickness of 50 mm is paved;

[0046] Step three: accurately hoist the prefabricated ecological tree pool into the prepared foundation pit for installation and stability, and prevent the reserved hole from being tamped;

[0047] Step four: after the prefabricated ecological tree pool is installed stably, the surrounding foundation pit soil backfilling work is done, and the soil is backfilled and tamped layer by layer.

[0048] Step five: install the interception net on the upper part of the water storage tank, hoist the prepared interception net suitable for the size of the ecological tree pool to the accurate position, install and fix it. The interception net can effectively intercept large-volume pollutants in runoff.

[0049] Step six: the filter grid is provided at the bottom of the outside of the interception pool and connected with the water storage tank, which can effectively intercept small-volume runoff pollutants; the overflow port with a diameter of 25 mm is provided at the inside, which is uniformly distributed in the inside of the interception pool, so that the runoff can flow to the purification pool through the overflow port of the interception pool when the rainfall runoff is small, achieving the purpose of pollutant purification.

[0050] Step seven: screen different particle sizes of pebbles, sand and gravel as fillers of the interception pool, which are gravel, sand and pebbles from bottom to top. Fill layer by layer, the bottom layer is filled with 20-30mm gravel with a height of 100mm and tamped; the middle layer is filled with 1mm sand with a height of 150mm and tamped; the upper layer is filled with 30-50mm pebbles with a height of 200mm and tamped.

[0051] Step eight: the 30μm water-permeable membrane is provided on the bottom plate of the purification pool, which can effectively intercept root growth and effectively drain water; the drainage port is also provided at the bottom of the purification pool, the diameter of the drainage port is between 2.5-3cm and is uniformly distributed on the bottom plate of the purification pool, achieving the purpose of rapid drainage.

[0052] Step nine: the purification pool is filled with pebbles, sand and gravel from bottom to top by selecting different filler materials and different particle sizes. The bottom layer is filled with 30-50mm pebbles with a height of 200mm and tamped; the middle layer is filled with 1mm sand with a height of 150mm and tamped; the upper layer is filled with 20-30mm gravel with a height of 100mm and tamped.

[0053] Step ten: during the sand filling process of the purification pool, measure and lay out the line, hoist the shrubs to the accurate position and plant them, and select the shrubs with specifications of about H80-120*D40cm, then backfill the sand layer by layer and tamp it. At the same time, add the microbial agent layer by layer during the sand backfilling process, 100g per layer, a total of 5 layers, and finally fill in the gravel and tamp it.

[0054] Step eleven: maintenance of the shrubs and microorganisms, watering every 1 day for the first week, and then watering every 2-3 days after a week, until the shrubs survive.

[0055] The above embodiments are the preferred embodiments of the present application, but the embodiments of the present application are not limited to the above embodiments, and any changes, modifications, substitutions, combinations, simplifications, etc. made without departing from the spirit and principles of the present application should be equivalent replacement methods and should be included in the protection scope of the present application.

Claims

1. An ecological tree box system for intercepting stormwater runoff pollutants, characterised in that: The prefabricated ecological tree pool comprises, from outside to inside, a water storage pool, an interception pool and a purification pool, a first pool wall is arranged between the water storage pool and the interception pool, a filter grid is arranged at the bottom of the first pool wall, and the filter grid is connected with the water storage pool and the interception pool; A second pool wall is arranged between the interception pool and the purification pool, the second pool wall is provided with a plurality of overflow holes from the bottom to the top, and the overflow holes are connected with the interception pool and the purification pool; the first pool wall is lower than the pool wall of the prefabricated ecological tree pool, and the second pool wall is lower than the first pool wall; The bottom of the prefabricated ecological tree pool is provided with a water storage pool, the water storage pool is located below the water storage pool, the interception pool and the purification pool, the purification pool is provided with a drainage port connected with the water storage pool; a water-permeable film is arranged above the drainage port, the water-permeable film is provided with a through hole, and the through hole is arranged in correspondence with the drainage port; The top of the purification pool is provided with a planting part, the planting part comprises a plant planting area and a microorganism planting area, and the microorganism planting area is distributed around the plant planting area; The prefabricated ecological tree pool is prepared by using ecological concrete, and the prefabricated ecological tree pool has a cylindrical structure. The water storage pool has an inverted triangular structure, the top of the water storage pool is provided with an interception net, and the two end edges of the interception net are connected with the pool wall of the prefabricated ecological tree pool and the top of the first pool wall respectively. The interception pool has a cylindrical structure, the overflow holes are circular holes, and the overflow holes are uniformly distributed on the second pool wall.

2. A rainwater runoff pollution interceptor eco-tree pit system according to claim 1, characterised in that: The interception pool is provided with a gravel layer, a sand layer and a pebble layer, and the gravel layer, the sand layer and the pebble layer are sequentially arranged from bottom to top in the interception pool.

3. A rainwater runoff pollution interceptor eco-tree pit system according to claim 2, wherein: The particle size of the gravel in the gravel layer is 20-30 mm, the particle size of the sand in the sand layer is 1 mm, and the particle size of the pebble in the pebble layer is 30-50 mm.

4. A rainwater runoff pollution interceptor eco-tree box system according to claim 1, characterized in that: The purification pool is provided with a pebble layer, a sand layer and a gravel layer, and the pebble layer, the sand layer and the gravel layer are sequentially arranged from bottom to top in the purification pool.

5. A rainwater runoff pollution interceptor eco-tree pit system according to claim 4, wherein: The particle size of the pebble in the pebble layer is 30-50 mm, the particle size of the sand in the sand layer is 1 mm, and the particle size of the gravel in the gravel layer is 20-30 mm.

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