CN214992791U - Make things convenient for town road structure of drainage - Google Patents

Abstract

The application relates to the technical field of municipal road construction, in particular to a municipal road structure convenient for drainage. A municipal road structure convenient for drainage comprises a road main body, drainage ditches are reserved on two sides of the road main body, the road main body comprises a rammed original soil layer, a first fine sand stone layer, a first large sand stone layer, a concrete water storage layer, a permeable concrete layer and an asphalt surface layer which are paved from bottom to top, the concrete water storage layer comprises a plurality of unit water storage casting pieces, and water storage cavities are integrally formed in the unit water storage casting pieces; the water storage cavities of the adjacent unit water storage casting parts are communicated with each other. The whole infiltration ability and the retaining ability of road body in this application are better, can be with rainwater ponding leading-in to the road surface below fast, effectively reduce the probability that surface ponding appears, guarantee pedestrian's trip safety.

Description

Make things convenient for town road structure of drainage

Technical Field

The application relates to the technical field of municipal road construction, in particular to a municipal road structure convenient for drainage.

Background

The municipal road is a concrete or asphalt road which has the function of external traffic as the name implies, and is used for transportation and pedestrian driving in cities, thereby facilitating the travel of residents.

Referring to fig. 1, currently, the related town road structure includes a road body 9 and drainage ditches 90, the drainage ditches 90 being respectively provided on both sides of the road. The drainage ditch 90 communicates with an overflow well 900 pre-buried in the road body 9.

For the relevant town road structure in the above scheme, the applicant finds that the following defects exist in the relevant technical scheme: in the southern city, in the season with large rainfall or in the rainstorm weather, the underground pipe network communicated with the overflow well in the relevant municipal road structure has limited water storage capacity, the rainwater permeation efficiency of the road main body is relatively poor, the municipal road surface is easy to have water accumulation, and the traveling safety of pedestrians is influenced.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem that ponding phenomenon easily just appears in relevant town road structure, influence pedestrian's trip safety, this application aim at provides a town road structure of convenient drainage.

The application purpose of the application is realized by the following technical scheme:

a municipal road structure convenient for drainage comprises a road main body, drainage ditches are reserved on two sides of the road main body, the road main body comprises a rammed original soil layer, a first fine sand stone layer, a first large sand stone layer, a concrete water storage layer, a permeable concrete layer and an asphalt surface layer which are paved from bottom to top, the concrete water storage layer comprises a plurality of unit water storage casting pieces, and water storage cavities are integrally formed in the unit water storage casting pieces; the water storage cavities of the adjacent unit water storage casting parts are communicated with each other.

Through adopting above-mentioned technical scheme, this application improves the road main part, combines through the concrete water storage layer that sets up, the concrete layer that permeates water, has promoted the whole infiltration ability and the water storage capacity of road main part, can be with rainwater ponding leading-in to the road surface below fast, effectively reduces the probability that the ponding appears in the road surface, guarantees pedestrian's trip safety.

Preferably, a water guide part is embedded in the drainage ditch; the water guide piece is communicated with a storage piece; the storage part is positioned below the water guide part; green belt areas are arranged on two sides of the road main body; the storage member is located directly below the greenbelt zone.

By adopting the technical scheme, the water guide piece plays a role in guiding the water body and collecting and temporarily storing the infiltration water body, so that the infiltration rainwater can be temporarily stored in the water guide piece, the drainage and water storage capacities are enhanced, and the temporary storage water body can be conveniently and quickly guided into the storage piece; the greenbelt area can purify the rainwater for through the rainwater of greenbelt area evolution, the water in the piece is stored, and the water can be recycled in the piece of storing, promotes the utilization ratio of water resource.

Preferably, the unit water-storing casting piece is integrally formed with a plurality of permeation pore canals; the diameter of the permeation pore canal is 2.0-12 mm; the distance between adjacent permeation pore canals is 20-40 mm; the aperture ratio of the upper surface of the unit water storage casting piece is 20-40%; the infiltration pore canal is vertical and is communicated with the water storage cavity.

Through adopting above-mentioned technical scheme, surface gathered water can be comparatively quick collect to the retaining cavity in through the infiltration pore, the surface gathered water of being convenient for discharge reduces the probability of surface gathered water, guarantees the security of pedestrian's trip.

Preferably, four peripheral side surfaces of the unit water storage casting part are respectively provided with an adjusting pore channel; communicating water storage cavities of adjacent unit water storage casting parts together through adjusting pore passages; the center of the water storage chamber is positioned on the central axis of the regulating channel.

By adopting the technical scheme, the water storage cavities in the water storage casting parts of each unit are communicated together, so that the drainage and water storage capacity is enhanced.

Preferably, one side surface of the unit water storage casting piece is integrally formed with a connecting prism; the opposite side surfaces of the connecting prisms of the unit water storage casting parts are integrally formed with grooves; the connecting prism can be embedded in the groove.

Through adopting above-mentioned technical scheme, the unit retaining casting piece equipment of being convenient for forms the concrete water storage layer, and complains the connection structure on and makes road surface overall structure stability better, can promote municipal road surface structure's life.

Preferably, the lower surface of the unit water storage casting part is provided with a flow guide pore passage; the diversion pore canal is communicated with the water storage cavity; the unit water storage casting piece is detachably communicated with a flow guide pipe fitting; one end of the flow guide pipe fitting is detachably communicated with a flow guide pore passage of the unit water storage casting piece, and the other end of the flow guide pipe fitting is inserted into the tamped original soil layer; a flow guide channel is integrally formed in the flow guide pipe fitting; the flow guide channel is communicated with the flow guide pore channel; the circumferential direction of the flow guide pipe fitting is provided with a through hole; the through hole is communicated with the flow guide channel.

Through adopting above-mentioned technical scheme, can accelerate the water body that keeps in water storage casting spare retaining cavity of water conservancy diversion unit to infiltrate the soil layer below the concrete water storage layer, can further promote holistic drainage retaining capacity, reduce the probability that surface gathered water appears, guarantee pedestrian's trip safety.

Preferably, the water guide piece comprises an aluminum alloy drainage shell, a grid plate, a filter plate and a communicating pipe, and the aluminum alloy drainage shell is embedded in the drainage ditch; the top of the aluminum alloy drainage shell is provided with a cleaning opening; the mesh grid plate is embedded in the cleaning opening; the filter plate is fixedly connected inside the aluminum alloy drainage shell and used for filtering sundries in rainwater; one end of the communicating pipe is communicated with the side wall of the bottom of the aluminum alloy drainage shell, and the other end of the communicating pipe is communicated with the storage piece.

Through adopting above-mentioned technical scheme, be convenient for clear up the impurity that is detained on the filter, guarantee that rainwater can comparatively permeate to aluminum alloy drainage casing bottom fast, reduce the probability that surface gathered water appears.

Preferably, the green belt area comprises a cement flow guide member, a first cobble layer, an activated carbon layer, a second fine gravel layer, a second coarse gravel layer and a second cobble layer which are laid from bottom to top, and a flow guide groove is integrally formed in the upper surface of the cement flow guide member along the length direction of the cement flow guide member; the first cobble layer and the activated carbon layer are laid in the flow guide groove from bottom to top; the cement flow guide piece is arranged right above the storage piece; a flow guide groove is vertically and downwards formed at the bottom of the flow guide groove; the flow guide groove is communicated with the storage part; a permeable concrete column is fixedly connected in the diversion groove.

Through adopting above-mentioned technical scheme, can carry out purification treatment to the rainwater, during the gained water body was collected to storing the piece, it can carry out reuse to collect the water body, has improved the utilization ratio of water resource.

In summary, the present application has the following advantages:

1. this application can promote drainage of whole municipal road surface, retaining ability, reduces the probability that surface gathered water appears, guarantees pedestrian's trip safety.

2. This application adopts the soil layer in greenbelt area to filter the rainwater and adsorbs, has reachd the purpose of purifying the water, collects the water and can carry out reuse, if can be used to water the vegetation in greenbelt district, has improved the utilization ratio of water resource.

Drawings

FIG. 1 is a schematic view of the structure of a related town road construction.

Fig. 2 is a schematic view of the overall structure in embodiment 1 of the present application.

Fig. 3 is a partially enlarged view of a portion a in fig. 2.

Fig. 4 is a schematic structural view of a unit water-retaining casting in embodiment 1 of the present application.

Fig. 5 is a schematic view of the overall structure in embodiment 2 of the present application.

Fig. 6 is a schematic structural view of a unit water-retaining casting in embodiment 2 of the present application.

Fig. 7 is a schematic view of the overall structure in embodiment 3 of the present application.

Fig. 8 is a schematic structural view of a unit water-retaining casting in embodiment 3 of the present application.

Fig. 9 is a schematic view of the connecting structure of the green belt zone and the storage member in embodiment 4 of the present application.

In the figure, 1, a water guide; 10. cleaning the opening; 11. an aluminum alloy drainage shell; 111. a cylindrical through hole; 12. a grid plate; 13. a filter plate; 14. a communicating pipe; 15. a water conduit; 2. a storage member; 21. a water pump; 22. a sprayer; 3. tamping an original soil layer; 31. a first fine gravel layer; 32. a first grit layer; 4. a concrete aquifer; 40. unit water storage casting parts; 400. limiting a cement casting; 401. a hollow sphere; 402. a first water conduit; 403. a second water conduit; 404. a third water conduit; 41. a water storage chamber; 42. a permeate channel; 43. a regulating pore passage; 44. connecting the prisms; 45. a groove; 46. a diversion duct; 47. a mating groove; 5. a pervious concrete layer; 6. an asphalt surface layer; 7. a flow directing pipe fitting; 71. a flow guide channel; 72. a through hole; 8. a green belt area; 81. a cement flow guide piece; 811. a flow guide groove; 812. a flow guide groove; 813. a permeable concrete column; 82. a first cobble layer; 83. an activated carbon layer; 84. a second fine gravel layer; 85. a second grit layer; 86. a second cobble layer; 87. a green plant layer; 9. a road body; 90. a drainage ditch; 900. an overflow well; 91. a first cement limiting pier; 92. a roadbed filling area; 93. and a second cement limiting pier.

Detailed Description

The present application will be described in further detail with reference to the following drawings and examples.

Example 1:

referring to fig. 2, for the municipal road structure of convenient drainage that this application disclosed, including road body 9, the pre-buried spacing mound 91 of first cement in road body 9 both sides is formed with road bed filling area 92 between the spacing mound 91 of first cement. The road main body 9 comprises a tamping original soil layer 3, a first fine sand stone layer 31, a first coarse sand stone layer 32, a concrete water storage layer 4, a permeable concrete layer 5 and an asphalt surface layer 6 which are paved in the roadbed filling area 92 from bottom to top. And drainage ditches 90 are reserved on two sides of the road body 9, and the drainage ditches 90 are attached to the side wall, facing the roadbed filling area 92, of the first cement limiting pier 91.

Referring to fig. 2, in order to facilitate cleaning of the drainage ditch 90, a water guide 1 is embedded in the drainage ditch 90. The water guide member 1 is fixedly communicated with a storage member 2 through a pipeline, and the storage member 2 is pre-buried in a soil layer on one side of the first cement limiting pier 91, which is back to the roadbed filling area 92. Storage 2 is the cavity cube body that forms is pour with cement, stores 2 top lateral walls of spare and communicates in the overflow well of underground pipe network through aqueduct 15, accessible overflow well row when storing 2 in the water body and storing too much in to underground pipe network.

Referring to fig. 2 and 3, the water guide member 1 includes an aluminum alloy drainage housing 11, a mesh grid plate 12, a filter plate 13 and a communication pipe 14, and the aluminum alloy drainage housing 11 is embedded in a drainage ditch 90 in a module manner. A plurality of cylindrical through holes 111 are formed in the upper portion of the side wall of the aluminum alloy drainage shell 11 in a penetrating mode, and rainwater seeping into the asphalt surface layer 6 can be collected into the aluminum alloy drainage shell 11. The top of the aluminum alloy drainage shell 11 is provided with a cleaning opening 10; the grid plate 12 is embedded in the cleaning opening 10, so that sundries in the aluminum alloy drainage shell 11 can be cleaned conveniently. The filter 13 is horizontal fixed connection inside the aluminum alloy drainage shell 11 for filtering sundries in rainwater, preventing the communicating pipe 14 from being blocked by the sundries and ensuring the drainage efficiency. The communicating pipe 14 is pre-buried inside the first cement limiting pier 91, one end of the communicating pipe 14 is communicated with the side wall of the bottom of the aluminum alloy drainage shell 11, and the other end of the communicating pipe is fixedly communicated with the side wall of the upper part of the storage part 2. Wherein, guarantee that storage 2 is located the below of water guide 1 for the infiltration body can be in storage 2 is assembled to the gravity acting force.

Referring to fig. 2, in which the compacted raw soil layer 3 is formed by compacting the raw soil layer, the compacted raw soil layer 3 is formed at the bottom of the roadbed filling area 92. The first fine gravel layer 31 is formed by paving gravels with the particle size of 6-15mm in the tamping original soil layer 3, and the infiltration water body can flow to the tamping original soil layer 3 through the gravel gaps in the first fine gravel layer 31, so that the whole rainwater infiltration efficiency is ensured. The first coarse gravel layer 32 is formed by paving gravels with the grain size of 18-30mm on the first fine gravel layer 31, and the infiltration water body can flow to the first fine gravel layer 31 through the gravel gaps in the first coarse gravel layer 32, so that the whole rainwater infiltration efficiency is ensured.

Referring to fig. 2, the concrete aquifer 4 comprises a limiting cement casting 400 for fixing the storage member 2 and a unit impounding casting 40 for improving the impounding capacity of drainage, and the limiting cement casting 400 and the unit impounding casting 40 are combined and laid on the first rough sand stone layer 32 to form the concrete aquifer 4. The limiting cement casting 400 is tightly attached to the first cement limiting pier 91 and placed on the surface of the first rough gravel layer 32. The drainage ditch 90 is integrally cast between the limiting cement casting 400 and the first cement limiting pier 91.

Referring to fig. 4, a hollow sphere 401 is formed in the unit water storage casting 40 by casting, the hollow sphere 401 is made of glass fiber reinforced plastic or ABS engineering plastic, the material is selected according to the compression resistance requirement of the road surface of the building, and if the compression resistance requirement of the road surface is higher, the glass fiber reinforced plastic hollow sphere 401 is preferred. The hollow sphere 401 has an integrally formed reservoir chamber 41 therein. The hollow sphere 401 is integrally formed with a plurality of first conduits 402 which communicate with the reservoir chamber 41. The first water introduction pipe 402 is formed with a penetration hole 42 communicating with the water storage chamber 41. The central axis of the first water guiding pipe 402 is perpendicular to the horizontal plane, which facilitates rapid guiding of the downward-permeated rainwater into the water storage chamber 41.

Referring to fig. 4, in order to ensure water permeation efficiency, the diameter of the permeation cell 42 is 3.5 ± 0.1mm, and the interval between adjacent permeation cell 42 is 30 mm. The aperture ratio of the upper surface of the unit water storage casting piece 40 is preferably 28-34%, so that the integral structural strength can be ensured, and the integral water storage casting piece has a good drainage and anti-fishing effect. The unit impounded water casting 40 is integrally formed with a plurality of second conduits 403 communicating with the impounded chamber 41. The second water introduction pipe 403 has one end communicating with the reservoir chamber 41 and the other end opening flush with the lower surface of the unit reservoir casting 40. The second water guiding pipe 403 is integrally formed with a flow guiding pore passage 46, the central axis of the flow guiding pore passage 46 is vertical, and the center of the water storage cavity 41 is located on the central axis of the flow guiding pore passage 46.

Referring to fig. 4, in order to increase the water storage capacity of the concrete aquifer 4, four third water conduits 404 are integrally formed with the hollow sphere 401. The included angle formed by the central axes of the adjacent third water conduits 404 is 90 degrees, the central axes of the third water conduits 404 are all located in the same horizontal plane, and the horizontal plane where the central axes of the third water conduits 404 are located can be divided into two parts on average. The center of the circumferential side of the unit water accumulating casting 40 is located on the central axis of the third water introduction pipe 404. The third water guiding pipe 404 is integrally formed with the regulating passage 43, and the center of the reservoir chamber 41 is located on the central axis of the regulating passage 43. Therefore, the communication between the reservoir chambers 41 is achieved between the adjacent unit reservoir castings 40 through the regulating orifice 43 of the third water conduit 404.

Referring to fig. 2, the pervious concrete layer 5 is formed by pouring pervious concrete on the concrete aquifer 4. In order to ensure the water permeability and the strength of the pervious concrete layer 5, the pervious concrete disclosed in CN106186926B can be adopted as the pervious concrete, the preparation method of embodiment 1 in CN106186926B is preferred as the pervious concrete, and the prepared concrete has good compressive strength and water permeability. The asphalt surface layer 6 is formed by paving asphalt granules on the pervious concrete layer 5. The porosity of the pervious concrete layer 5 and the asphalt surface layer 6 is good, so that rainwater can permeate into the concrete water storage layer 4 relatively quickly, and the infiltration rainwater can be collected in the water storage cavity 41 of the unit water storage casting piece 40 relatively quickly, so that the water accumulation on the road surface can be effectively prevented.

Example 2:

example 2 differs from example 1 in that: referring to fig. 5 and 6, in order to facilitate the assembly of the unit impounding casting 40 to form the concrete impounding layer 4, a connecting prism 44 is integrally cast on one side surface of the unit impounding casting 40. The unit water storage casting piece 40 integrally forms a groove 45 formed by integrally casting opposite side faces of the connecting prism 44, and the connecting prism 44 can be embedded in the groove 45, so that the unit water storage casting piece 40 is conveniently assembled to form the concrete water storage layer 4. A matching groove 47 is integrally formed in one side face of the limiting cement casting piece 400 in a pouring mode, the connecting prism 44 can be embedded in the matching groove 47, and the limiting cement casting piece 400 and the unit water storage casting piece 40 are rapidly positioned and assembled.

Example 3:

example 3 differs from example 2 in that: referring to fig. 7 and 8, the second water introduction pipe 403 is snap-fitted with the water introduction pipe member 7. One end of the diversion pipe fitting 7 is clamped and communicated with the second diversion pipe 403 in the unit water storage casting piece 40, and the other end is vertically inserted into the tamping original soil layer 3. In order to accelerate rainwater infiltration, a flow guide channel 71 communicated with the flow guide pore passage 46 is integrally formed in the flow guide pipe fitting 7, and a through hole 72 communicated with the flow guide channel 71 is formed in the flow guide pipe fitting 7 in a penetrating mode in the circumferential direction. The through hole 72 is arranged obliquely downwards, and an included angle formed by the central axis of the through hole 72 and the central axis of the flow guide pipe fitting 7 is an acute angle which is 45-60 degrees.

Example 4:

example 4 differs from example 3 in that: referring to fig. 9, the green belt area 8 is provided on both sides of the road body 9, the storage member 2 is located right below the green belt area 8, and the rainwater purified by the green belt area 8 is collected in the storage member 2. A second cement limiting pier 93 is embedded in one side of the first cement limiting pier 91, and a green belt area 8 is formed between the second cement limiting pier 93 and the first cement limiting pier 91. The storage member 2 is fixedly connected to the bottom between the second cement limiting pier 93 and the first cement limiting pier 91.

Referring to fig. 9, the green belt zone 8 includes a cement guide 81, a first cobble layer 82, an activated carbon layer 83, a second fine gravel layer 84, a second coarse gravel layer 85, a second cobble layer 86, and a green vegetation layer 87 for purifying water quality, which are laid from bottom to top. Wherein, the upper surface of the cement guide member 81 is integrally formed with a guide groove 811 along the length direction thereof, and the cross section of the guide groove 811 is an isosceles triangle of which the upper bottom is larger than the lower bottom. The first cobble layer 82 and the activated carbon layer 83 are laid in the flow guide groove 811 from bottom to top.

Referring to fig. 9, the second fine gravel layer 84 is formed by laying gravel having a particle size of 8 to 12mm on the activated carbon layer 83, and the infiltration water can flow to the activated carbon layer 83 through the voids of the gravel in the second fine gravel layer 84, thereby ensuring the overall rainwater infiltration efficiency. The second coarse gravel layer 85 is formed by paving gravels with the particle size of 15-24mm on the second fine gravel layer 84, and the infiltration water body can flow to the second fine gravel layer 84 through the gravel gaps in the second coarse gravel layer 85, so that the whole rainwater infiltration efficiency is ensured.

Referring to fig. 9, the cement diversion member 81 is disposed over the storage member 2, and a diversion groove 812 communicated with the storage member 2 is vertically formed at the bottom of the diversion groove 811, so that the purified water can be collected into the storage member 2. In order to prevent the diversion groove 812 from being blocked, a permeable concrete column 813 is fixedly connected in the diversion groove 812. In order to improve the utilization rate of water resources, the storage part 2 is communicated with a water suction pump 21, the water suction pump 21 is communicated with a sprayer 22, and a spray head of the sprayer 22 faces the green plant layer 87.

The embodiments of the present invention are preferred embodiments of the present application, and the scope of protection of the present application is not limited by the embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (8)

1. The utility model provides a make things convenient for town road structure of drainage, includes road main part (9), and the both sides of road main part (9) are reserved has escape canal (90), its characterized in that: the road main body (9) comprises a rammed original soil layer (3), a first fine sand stone layer (31), a first coarse sand stone layer (32), a concrete water storage layer (4), a permeable concrete layer (5) and an asphalt surface layer (6) which are paved from bottom to top, the concrete water storage layer (4) comprises a plurality of unit water storage casting parts (40), and water storage cavities (41) are integrally formed in the unit water storage casting parts (40); the water storage cavities (41) of the adjacent unit water storage casting parts (40) are communicated with each other.

2. A municipal road structure for facilitating drainage according to claim 1, wherein: a water guide part (1) is embedded in the drainage ditch (90); the water guide piece (1) is communicated with a storage piece (2); the storage part (2) is positioned below the water guide part (1); green belt zones (8) are arranged on two sides of the road main body (9); the storage member (2) is located directly below the greenbelt zone (8).

3. A municipal road structure for facilitating drainage according to claim 2, wherein: the unit water-retaining casting (40) is integrally formed with a plurality of infiltration tunnels (42); the diameter of the infiltration pore canal (42) is 2.0-12 mm; the distance between adjacent permeation pore canals (42) is 20-40 mm; the aperture ratio of the upper surface of the unit water storage casting piece (40) is 20-40%; the penetration pore canal (42) is vertical and communicated with the water storage chamber (41).

4. A municipal road structure for facilitating drainage according to claim 3, wherein: adjusting pore channels (43) are respectively arranged on four peripheral side surfaces of the unit water storage casting piece (40); the water storage cavities (41) of the adjacent unit water storage casting parts (40) are communicated together through the adjusting pore canal (43); the center of the water storage chamber (41) is positioned on the central axis of the regulating duct (43).

5. A municipal road structure for facilitating drainage according to claim 4, wherein: a connecting prism (44) is integrally formed on one side surface of the unit water storage casting piece (40); a groove (45) is integrally formed on the side surface of the connecting prism (44) of the unit water storage casting piece (40); the connecting prism (44) can be embedded in the groove (45).

6. A municipal road structure for facilitating drainage according to claim 5, wherein: the lower surface of the unit water storage casting piece (40) is provided with a flow guide pore canal (46); the diversion pore canal (46) is communicated with the water storage cavity (41); the unit water storage casting piece (40) is detachably communicated with a flow guide pipe fitting (7); one end of the flow guide pipe fitting (7) is detachably communicated with a flow guide pore passage (46) of the unit water storage casting piece (40), and the other end of the flow guide pipe fitting is inserted into the tamped original soil layer (3); a flow guide channel (71) is integrally formed in the flow guide pipe fitting (7); the flow guide channel (71) is communicated with the flow guide pore passage (46); the flow guide pipe fitting (7) is circumferentially provided with through holes (72); the through hole (72) is communicated with the flow guide channel (71).

7. A municipal road structure for facilitating drainage according to claim 2, wherein: the water guide piece (1) comprises an aluminum alloy drainage shell (11), a grid plate (12), a filter plate (13) and a communicating pipe (14), and the aluminum alloy drainage shell (11) is embedded in the drainage ditch (90); the top of the aluminum alloy drainage shell (11) is provided with a cleaning opening (10); the grid plate (12) is embedded in the cleaning opening (10); the filter plate (13) is fixedly connected inside the aluminum alloy drainage shell (11) and is used for filtering sundries in rainwater; one end of the communicating pipe (14) is communicated with the side wall of the bottom of the aluminum alloy drainage shell (11) and the other end is communicated with the storage part (2).

8. A municipal road structure for facilitating drainage according to claim 7, wherein: the green belt area (8) comprises a cement flow guide piece (81), a first cobble layer (82), an activated carbon layer (83), a second fine gravel layer (84), a second coarse gravel layer (85) and a second cobble layer (86), wherein the cement flow guide piece (81) is paved from bottom to top, and a flow guide groove (811) is integrally formed in the upper surface of the cement flow guide piece (81) along the length direction of the cement flow guide piece; the first cobble layer (82) and the activated carbon layer (83) are laid in the flow guide groove (811) from bottom to top; the cement flow guide piece (81) is arranged right above the storage piece (2); a flow guide groove (812) is vertically and downwards formed at the bottom of the flow guide groove (811); the flow guide groove (812) is communicated with the storage part (2); a permeable concrete column (813) is fixedly connected in the flow guide groove (812).

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