CN109098268B - Rainwater infiltration and accumulation system - Google Patents

Rainwater infiltration and accumulation system Download PDF

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Publication number
CN109098268B
CN109098268B CN201811042288.3A CN201811042288A CN109098268B CN 109098268 B CN109098268 B CN 109098268B CN 201811042288 A CN201811042288 A CN 201811042288A CN 109098268 B CN109098268 B CN 109098268B
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water
layer
permeability
concave
rainwater
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CN109098268A (en
Inventor
李尝君
朱坚
彭华
纪雄辉
李胜男
简燕
熊丽萍
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Hunan Institute Of Agro-Environment And Ecology
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Hunan Institute Of Agro-Environment And Ecology
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    • EFIXED CONSTRUCTIONS
    • E03WATER SUPPLY; SEWERAGE
    • E03FSEWERS; CESSPOOLS
    • E03F5/00Sewerage structures
    • E03F5/10Collecting-tanks; Equalising-tanks for regulating the run-off; Laying-up basins
    • E03F5/103Naturals or landscape retention bodies, e.g. ponds
    • EFIXED CONSTRUCTIONS
    • E03WATER SUPPLY; SEWERAGE
    • E03FSEWERS; CESSPOOLS
    • E03F1/00Methods, systems, or installations for draining-off sewage or storm water
    • EFIXED CONSTRUCTIONS
    • E03WATER SUPPLY; SEWERAGE
    • E03FSEWERS; CESSPOOLS
    • E03F5/00Sewerage structures
    • E03F5/10Collecting-tanks; Equalising-tanks for regulating the run-off; Laying-up basins
    • E03F5/105Accessories, e.g. flow regulators or cleaning devices
    • EFIXED CONSTRUCTIONS
    • E03WATER SUPPLY; SEWERAGE
    • E03FSEWERS; CESSPOOLS
    • E03F5/00Sewerage structures
    • E03F5/14Devices for separating liquid or solid substances from sewage, e.g. sand or sludge traps, rakes or grates

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Hydrology & Water Resources (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Sewage (AREA)

Abstract

The invention discloses a rainwater infiltration and accumulation system, which comprises a concave lawn structure and an underground water storage device, wherein a plurality of infiltration and water extraction prefabricated members are inserted in the concave lawn structure at intervals, the underground water storage device is arranged at the bottom of the concave lawn structure, and a drainage pipeline is arranged on the side surface of the underground water storage device; the drainage pipeline can be connected to an urban water storage recycling system. The rainwater infiltration and accumulation system integrates the concave lawn structure and the underground water storage device, is connected with the urban water storage and recycling system through the drainage pipeline, effectively realizes accumulation, storage and purification of rainwater runoffs, relieves urban waterlogging, and realizes that rainwater infiltration is increased in stormwater weather and water migration is realized under the condition of no rainfall by arranging a plurality of infiltration and water lifting prefabricated members at intervals in the concave lawn structure.

Description

Rainwater infiltration and accumulation system
Technical Field
The invention relates to the technical field of sponge urban drainage, in particular to a rainwater infiltration and storage system.
Background
Urban waterlogging mainly occurs due to overload of short-time strong rainfall, pipeline drainage facilities and rainwater regulation facilities, flood disasters occur in low topography areas, and municipal facilities are destroyed, traffic paralysis and life safety are threatened when severe. In the urban development process, due to incomplete planning and unscientific facility construction, urban waterlogging occurs frequently in a plurality of cities at home and abroad, and the economic development of areas is severely restricted. The sponge city is an ecological city construction concept which is provided for solving the problems of urban waterlogging, non-point source pollution, unbalance of a city water circulation system and the like, and mainly adopts facilities (especially a rainwater collecting pipe network and a greenbelt system) which can enhance the functions of rainwater seepage, stagnation, storage, purification, use and drainage through reasonable planning construction of cities, thereby achieving the purposes of rainwater resource collection and utilization and rainwater flood safety management.
Due to the lack of reasonable underground pipe gallery design in urban construction in history, urban pipe network system reconstruction is difficult to implement, the current sponge urban construction tends to reconstruct a large urban system, and the current sponge urban construction is decomposed into a plurality of small community unit rainwater storage system constructions, namely 'sponge community construction', but the current method for sponge community construction or reconstruction is still relatively lack.
Urban green space is an important component of ecological city construction, and has important significance for regulating urban microclimate and maintaining urban ecological system stability. However, the construction and maintenance of the current urban green space consumes a great deal of water resources, further increasing the urban water supply pressure.
Disclosure of Invention
In view of the above, the rainwater infiltration and accumulation system provided by the invention better overcomes the problems and defects existing in the prior art, integrates the concave lawn structure and the underground water storage device, is connected with the urban water storage and recycling system through the drainage pipeline, effectively realizes accumulation, storage and purification of rainwater runoff, relieves urban waterlogging, and increases rainwater infiltration in rainy days by arranging a plurality of infiltration-increasing water-lifting prefabricated members at intervals in the concave lawn structure, and can move water in the water storage layer in the concave lawn structure up to the water-retaining layer for vegetation layer vegetation absorption under the condition of no rainfall, thereby achieving effective storage and utilization of rainwater resources, and having outstanding social, environmental and economic benefits.
Specifically, the present invention proposes the following specific embodiments:
the rainwater infiltration and accumulation system comprises a concave lawn structure and an underground water storage device, wherein the concave lawn structure is lower than the ground, a plurality of infiltration enhancing water lifting prefabricated members are inserted in the concave lawn structure in an isolated manner, and the underground water storage device is arranged at the bottom of the concave lawn structure;
the concave lawn structure sequentially comprises a vegetation layer, a water-retaining layer, a filter layer, a water-storage layer and a basal layer from top to bottom;
the permeability-increasing water-lifting prefabricated member comprises a permeability-increasing pipe with a porous pipe wall and a water-absorbing layer coated on the outer wall of the permeability-increasing pipe, wherein the bottom end of the permeability-increasing pipe extends into the water storage layer, the top end of the permeability-increasing pipe does not exceed the vegetation layer, the water-absorbing layer comprises a first water-absorbing layer and a second water-absorbing layer, the first water-absorbing layer is fully coated on the outer wall of the permeability-increasing pipe and is positioned on the water-retaining layer, the second water-absorbing layer is in a vertical strip shape and is arranged on the part, below the water-retaining layer, of the outer wall of the permeability-increasing pipe, the first water-absorbing layer is connected with the second water-absorbing layer, and the bottom end of the second water-absorbing layer extends into the water storage layer.
A drainage pipeline is arranged on the side surface of the underground water storage device; the drainage pipeline can be connected to an urban water storage recycling system.
Further, the vegetation layer is planted turf; the water-retaining layer is humus soil or a compound of humus soil, fine sand and a water-retaining agent; the filter layer is permeable mortar; the water storage layer is of a porous plastic structure; the basal layer is original soil.
Further, the concave lawn structure further comprises a slow-permeation layer arranged between the water storage layer and the basal layer, and the slow-permeation layer is geotextile.
Further, the rainwater infiltration and accumulation system further comprises a runoff collection module communicated to the upper end of the concave lawn structure; the runoff collection module is a drainage groove.
Further, a filtering device is arranged in the runoff collection module.
Further, the rainwater infiltration and accumulation system further comprises an overflow pipeline arranged on the side face of the concave lawn structure.
Further, the permeability-increasing water-lifting prefabricated member further comprises an annular grid arranged at the top end of the permeability-increasing pipe, and a top cover is arranged at the top of the annular grid.
Further, the permeability-increasing water-lifting prefabricated member further comprises a filling particle layer which is arranged at the bottom of the permeability-increasing pipe and used for purifying water.
Further, a baffle member with a plurality of water permeable holes is arranged above the filling particle layer.
Further, the top cover is detachably connected with the top of the annular grille; the baffle member is connected with the top cover through a connecting rod, and can move up and down in the permeability increasing pipe along with the up and down movement of the top cover.
Compared with the prior art, the rainwater infiltration and accumulation system has the beneficial effects that:
1. the rainwater infiltration and accumulation system integrates the concave lawn structure and the underground water storage device, is connected with the urban water storage and recycling system through the drainage pipeline, effectively achieves accumulation, storage and purification of rainwater runoffs, relieves urban waterlogging, and increases rainwater infiltration in stormwater weather by inserting a plurality of infiltration-increasing water-lifting prefabricated members in the concave lawn structure at intervals, and can move water in the water storage layer in the concave lawn structure up to the water-retaining layer for vegetation layer absorption under the rainfall-free condition, so that energy-free water for irrigation is supplemented to green land, effective storage and utilization of rainwater resources are achieved, and outstanding social, environmental and economic benefits are achieved.
2. Furthermore, the rainwater infiltration and accumulation system is beneficial to rapidly collecting rainwater to the concave lawn structure and carrying out subsequent rainwater accumulation and discharge treatment by arranging the runoff collecting module communicated to the upper end of the concave lawn structure; in addition, the filtering device is arranged in the runoff collecting module, so that large particulate matters in the rainwater runoff can be filtered and intercepted.
3. Furthermore, the rainwater infiltration storage system can be used for purifying sewage entering the infiltration enhancement pipe by arranging the filling particle layer for purifying water at the bottom of the infiltration enhancement pipe of the infiltration enhancement water lifting prefabricated member.
4. Furthermore, the rainwater infiltration storage system can prevent impurities such as dead branches, fallen leaves and the like carried in the rainwater runoff from entering the infiltration enhancing pipe to cause blockage by arranging the annular grating and the top cover at the top of the infiltration enhancing pipe of the infiltration enhancing water lifting prefabricated member.
In order to make the above objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a rainwater infiltration system of the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1A;
FIG. 3 is an enlarged view of part of B in FIG. 2;
FIG. 4 is a front view of the enhanced water lift preform of the present invention;
FIG. 5 is a schematic cross-sectional view of a permeability-increasing water-lifting prefabricated member of the present invention.
Reference numerals illustrate:
1. rainwater infiltration and accumulation system
100. Concave lawn structure
110. Vegetation layer
120. Water-retaining layer
130. Filter layer
140. Aquifer
150. Slow permeation layer
160. Substrate layer
200. Underground water storage device
300. Prefabricated component for enhancing permeability and extracting water
310. Permeation enhancing pipe
320. Water-absorbing layer
321. First water absorption layer
322. Second water-absorbing layer
330. Annular grille
340. Top cover
350. Filled particle layer
360. Baffle piece
370. Connecting rod
400. Drainage pipeline
500. Runoff collection module
600. Filtering device
700. Overflow pipeline
Detailed Description
In order to facilitate an understanding of the invention, a more complete description of the rainwater infiltration system will now be provided with reference to the associated drawings. Preferred embodiments of the rainwater infiltration system are shown in the drawings. However, the rainwater infiltration system may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
In the description of the present invention, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In the description of the present invention, unless otherwise specified and defined, it should be noted that the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, mechanical or electrical, or may be in communication with each other between two elements, directly or indirectly through intermediaries, as would be understood by those skilled in the art, in view of the specific meaning of the terms described above.
Examples
Referring to fig. 1-3, the present invention provides a rainwater infiltration storage system 1 comprising a concave lawn structure 100 and an underground water storage apparatus 200. The concave lawn structure 100 is lower than the ground, and the concave lawn structure 100 sequentially comprises a vegetation layer 110, a water retaining layer 120, a filter layer 130, an aquifer 140 and a substrate layer 160 from top to bottom. The concave lawn structure 100 provided by the invention improves the collection, storage and filtering capabilities of rainwater on the premise of meeting the requirements of greenbelt ecology, landscapes and other basic requirements.
Preferably, in the embodiment of the present invention, the vegetation layer 110 is a low flood-resistant plant planted on the water-retaining layer 120 and having the functions of absorbing and intercepting rainwater, and the depth of the concave lawn structure 100 is determined according to the flood resistance and soil permeability of the plant of the vegetation layer 110; preferably, the concave lawn structure 100 has a concave depth of 50-150cm. The water-retaining layer 120 is a compound formed by mixing humus soil or humus soil, fine sand and a water-retaining agent according to any proportion; the thickness of the water-retaining layer 120 is about 20-30cm, which serves as a seedling-growing nutrient substrate, and provides necessary moisture and nutrients to the vegetation layer 110. The filter layer 130 is constructed of a permeable mortar and has a thickness of about 20-30cm. The aquifer 140 is constructed of a porous plastic or gravel and has a thickness of about 50-70cm. The substrate layer 160 uses compacted raw soil having a thickness of about 25-30cm.
Further, the concave lawn structure further includes a slow-permeation layer 150 disposed between the aquifer 140 and the substrate layer 160, and the slow-permeation layer 150 is a geotextile mat formed of a nonwoven geotextile. The non-woven geotextile is a water-permeable geotextile composite material formed by needling or braiding synthetic fibers, has excellent functions of filtration, isolation, reinforcement and protection, and has good permeability, high temperature resistance, freezing resistance, aging resistance and corrosion resistance.
The concave lawn structure 100 is inserted with a plurality of permeability-increasing water-lifting prefabricated members 300, and the number of the permeability-increasing water-lifting prefabricated members 300, the spacing between adjacent permeability-increasing water-lifting prefabricated members 300, the arrangement mode and the like can be set according to the area and the actual requirement of the actual concave lawn structure 100, which is not limited herein. The term "several" may be recited as 5, 10, 50 or 100, etc.
As shown in fig. 4 and fig. 5, the permeability-increasing water-lifting prefabricated member 300 includes a permeability-increasing pipe 310 with a porous pipe wall and a water-absorbing layer 320 coated on the outer wall of the permeability-increasing pipe 310, wherein the bottom end of the permeability-increasing pipe 310 extends into the water-storing layer 140, the top end of the permeability-increasing pipe 310 does not exceed the vegetation layer 110, the inner diameter of the permeability-increasing pipe 310 is preferably 200mm, and UPVC, steel or copper materials can be adopted. The pore diameter of the permeability increasing pipe 310 is about 5-30mm, preferably, the pore diameter of the permeability increasing pipe 310 on the upper pipe wall of the water-retaining layer 120 is 5-10mm, and the pore diameter of the lower pipe wall of the permeability increasing pipe below the water-retaining layer 120 is 20-30mm. The water-absorbing layer 320 comprises a first water-absorbing layer 321 and a second water-absorbing layer 322, and the material of the water-absorbing layer is preferably water-absorbing felt. The outer wall of the permeability increasing pipe 310 is located at the water-retaining layer 120 and is fully wrapped with a first water-absorbing layer 321, and the first water-absorbing layer 321 not only can absorb water and supply the water absorbed by the first water-absorbing layer to the water-retaining layer 120, but also can prevent humus soil or a complex of humus soil, fine sand and a water-retaining agent of the water-retaining layer 120 from blocking holes on the pipe wall of the permeability increasing pipe 310. Some water absorbent material such as non-woven fabrics or plant fibers may be disposed in the water-retaining layer 120, so that the first water absorbent layer contacts the water absorbent material in the water-retaining layer to promote the lateral movement of water in the surface soil.
The portion of the outer wall of the permeability increasing pipe 310 below the water retaining layer 120 (i.e., the portion of the filter layer 130 and the aquifer 140 of the concave lawn structure 100) is provided with at least two second water absorbing layers 322 in the shape of vertical strips, the first water absorbing layer 321 is connected with the second water absorbing layer 322, and the bottom end of the second water absorbing layer 322 extends into the aquifer 140. The first water-absorbing layer 321 and the second water-absorbing layer 322 may be an integral structure or a stitched and spliced structure. It should be noted that, the portion of the outer wall of the permeability increasing pipe 310 below the water retaining layer 120 needs to be left with the portion covered by the water absorbing layer 320, which is favorable for increasing rainwater to rapidly permeate and drain water in stormwater, and under no rainfall condition, the water in the water retaining layer 140 can be lifted up to the water retaining layer 120 through the second water absorbing layer 322 and the first water absorbing layer 321 in order to be absorbed by vegetation layer 110, so that no additional water source is needed to be found to supplement irrigation water for greenbelt.
The subsurface water storage device 200 is disposed at the bottom of the concave lawn structure 100; the underground water storage device 200 is a water storage tank or a water storage pit, and a drainage pipeline 400 is arranged on the side surface of the underground water storage device 200; the drain pipe 400 may be a PP (polypropylene) pipe or a PVC (polyvinyl chloride) pipe, etc. The drainage pipeline 400 can be connected to an urban water storage and recycling system to jointly construct a sponge urban water storage and drainage system; the rainwater infiltration and storage system 1 provided by the embodiment of the invention can enable rainwater to be filtered and quickly infiltrated into underground water, and can also be transmitted to an urban water storage and recycling system through the drainage pipeline 400 for centralized treatment, recycling, reuse and the like. The number of the drainage pipes 400 is set according to actual needs, for example, a plurality of drainage pipes 400 may be disposed at intervals on the side of the groundwater storage device 200. The underground water storage device 200 not only realizes the functions of storing, dispatching, recycling and the like of part of rainwater, but also has smaller volume and low construction cost, and the rainwater discharged through the underground water storage device 200 and the drainage pipeline 400 is subjected to multi-layer infiltration and purification, so that the water quality is obviously improved, and the treatment difficulty of an urban rainwater and sewage treatment plant is reduced. Preferably, the underground water storage device 200 can be provided with pumping facilities to recycle the collected rainwater to green land irrigation, domestic water and the like.
As can be seen from the above description, the rainwater infiltration and accumulation system 1 of the present invention integrates the concave lawn structure 100 and the underground water storage device 200, and is connected with the urban water storage and recycling system through the drainage pipeline 400, so as to effectively realize accumulation, storage and purification of rainwater runoff, alleviate urban waterlogging, and increase rainwater infiltration in stormwater weather by inserting a plurality of infiltration-increasing water lifting prefabricated members 300 in the concave lawn structure 100, and can move up the water in the water storage layer 140 in the concave lawn structure 100 to the water retention layer 120 for absorption by the vegetation layer 110 under no rainfall condition, thereby achieving no energy consumption and supplementing water for irrigation in greenland, realizing effective storage and utilization of rainwater resources, and having outstanding social, environmental and economic benefits.
Preferably, in the embodiment of the present invention, the rainwater infiltration storage system 1 further includes a runoff collection module 500 connected to the upper end of the concave lawn structure 100; the runoff collection module 500 is a plurality of drainage channels extending to the upper end of the concave lawn structure 100. Embodiments of the present invention facilitate centralized drainage to the concave lawn structure 100 by collecting stormwater runoffs to the drainage channels.
Preferably, the runoff collecting module 500 is provided with a filtering device 600, and the filtering device 600 may be a plurality of packed wetlands or grid ponds arranged in the drainage grooves and used for filtering and intercepting large particulate matters in the rainwater runoff.
Preferably, in the embodiment of the present invention, the rainwater infiltration storage system 1 further includes an overflow pipe 700 disposed at a side of the concave lawn structure 100, for discharging rainwater exceeding the infiltration storage capacity of the concave lawn structure 100, so as to improve the flood storage capacity of the concave lawn structure 100. The overflow conduit 700 may be connected to a municipal water storage reuse system.
Preferably, in the embodiment of the present invention, the permeability-increasing water-lifting prefabricated member 300 further includes an annular grille 330 disposed at the top end of the permeability-increasing pipe 310, and a top cover 340 is disposed at the top of the annular grille 330. By arranging the annular grating 330 and the top cover 340, impurities such as dead branches, fallen leaves and the like carried in the rainwater runoff can be prevented from entering the permeability increasing pipe 310 to cause blockage.
Preferably, in the embodiment of the present invention, the permeability-increasing water-lifting prefabricated member 300 further includes a filling particle layer 350 disposed at the bottom of the permeability-increasing pipe 310 for purifying water, and the filling particle layer 350 may be filled with activated carbon particles for purifying the sewage entering the permeability-increasing pipe 310.
Preferably, a barrier member 360 having a plurality of water permeable holes is disposed above the packed particle layer 350, and the diameter of the water permeable holes on the barrier member 360 may be set to 4-6mm.
Preferably, the top cover 340 is detachably connected to the top of the annular grill 330; the baffle member 360 is connected to the top cover 340 by a connecting rod 370, and the baffle member 360 can move up and down in the permeability increasing pipe 310 along with the up and down movement of the top cover 340.
It should be noted that, the annular grille 330, the top cover 340, the connecting rod 370 and the baffle member 360 may be made of UPVC or copper, the baffle member 360 may trap contaminants such as impurities entering the permeability increasing pipe 310, and the baffle member 360 may be taken out by lifting the top cover 340, and the impurities on the baffle member 360 may be cleaned periodically to avoid blocking the permeability increasing pipe 310.
The annular grille 330 and the baffle 360 can be made of steel, copper, aluminum, PE, PP, PVC, etc.
In summary, compared with the prior art, the rainwater infiltration and accumulation system has the following beneficial effects:
1. the rainwater infiltration and accumulation system integrates the concave lawn structure and the underground water storage device, is connected with the urban water storage and recycling system through the drainage pipeline, effectively achieves accumulation, storage and purification of rainwater runoffs, relieves urban waterlogging, and increases rainwater infiltration in stormwater weather by inserting a plurality of infiltration-increasing water-lifting prefabricated members in the concave lawn structure at intervals, and can move water in the water storage layer in the concave lawn structure up to the water-retaining layer for vegetation layer absorption under the rainfall-free condition, so that energy-free water for irrigation is supplemented to green land, effective storage and utilization of rainwater resources are achieved, and outstanding social, environmental and economic benefits are achieved.
2. Furthermore, the rainwater infiltration and accumulation system is beneficial to rapidly collecting rainwater to the concave lawn structure and carrying out subsequent rainwater accumulation and discharge treatment by arranging the runoff collecting module communicated to the upper end of the concave lawn structure; in addition, the filtering device is arranged in the runoff collecting module, so that large particulate matters in the rainwater runoff can be filtered and intercepted.
3. Furthermore, the rainwater infiltration storage system can be used for purifying sewage entering the infiltration enhancement pipe by arranging the filling particle layer for purifying water at the bottom of the infiltration enhancement pipe of the infiltration enhancement water lifting prefabricated member.
4. Furthermore, the rainwater infiltration storage system can prevent impurities such as dead branches, fallen leaves and the like carried in the rainwater runoff from entering the infiltration enhancing pipe to cause blockage by arranging the annular grating and the top cover at the top of the infiltration enhancing pipe of the infiltration enhancing water lifting prefabricated member.
Although terms indicating structures such as "concave lawn structure", "underground water storage", "runoff collection module", etc. are used more above, the possibility of using other terms is not excluded. These terms are used merely for convenience in describing and explaining the nature of the invention; they are to be interpreted as any additional limitation that is not inconsistent with the spirit of the present invention.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention.

Claims (6)

1. A rainwater infiltration system, characterized in that: the underground water storage device is arranged at the bottom of the concave lawn structure;
the concave lawn structure sequentially comprises a vegetation layer, a water-retaining layer, a filter layer, a water-storage layer and a basal layer from top to bottom;
the permeability-increasing water-lifting prefabricated member comprises a permeability-increasing pipe with a porous pipe wall and a water-absorbing layer coated on the outer wall of the permeability-increasing pipe, wherein the bottom end of the permeability-increasing pipe extends into the water storage layer, the top end of the permeability-increasing pipe does not exceed the vegetation layer, the water-absorbing layer comprises a first water-absorbing layer and a second water-absorbing layer, the first water-absorbing layer is fully coated on the outer wall of the permeability-increasing pipe and is positioned on the water-retaining layer, the second water-absorbing layer is in a vertical strip shape and is arranged on the part, below the water-retaining layer, of the outer wall of the permeability-increasing pipe, the first water-absorbing layer is connected with the second water-absorbing layer, and the bottom end of the second water-absorbing layer extends into the water storage layer.
The permeability-increasing water-lifting prefabricated member further comprises an annular grating arranged at the top end of the permeability-increasing pipe, and a top cover is arranged at the top of the annular grating; the permeability-increasing water-lifting prefabricated member further comprises a filling particle layer which is arranged at the bottom of the permeability-increasing pipe and used for purifying water; a baffle piece with a plurality of water permeable holes is arranged above the filling particle layer; the top cover is detachably connected with the top of the annular grating; the baffle piece is connected with the top cover through a connecting rod, and can move up and down in the permeability increasing pipe along with the up and down movement of the top cover;
a drainage pipeline is arranged on the side surface of the underground water storage device; the drainage pipeline can be connected to an urban water storage recycling system;
the water-retaining layer is humus soil or a compound of humus soil, fine sand and a water-retaining agent.
2. A rainwater infiltration storage system as claimed in claim 1, wherein: the vegetation layer is planted turf; the filter layer is permeable mortar; the water storage layer is of a porous plastic structure; the basal layer is original soil.
3. A rainwater infiltration storage system as claimed in claim 1, wherein: the concave lawn structure further comprises a slow-permeation layer arranged between the water storage layer and the basal layer, and the slow-permeation layer is geotextile.
4. A rainwater infiltration storage system as claimed in claim 1, wherein: the rainwater infiltration and accumulation system further comprises a runoff collection module communicated to the upper end of the concave lawn structure; the runoff collection module is a drainage groove.
5. A rainwater infiltration storage system as claimed in claim 4, wherein: the device also comprises a filtering device arranged in the runoff collection module.
6. A rainwater infiltration storage system as claimed in claim 1, wherein: the rainwater infiltration and accumulation system further comprises an overflow pipeline arranged on the side face of the concave lawn structure.
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CN111270742A (en) * 2019-11-21 2020-06-12 浙江省建筑设计研究院 Urban rainwater treatment system
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