CN111648438B

CN111648438B - Rainwater garden for city park

Info

Publication number: CN111648438B
Application number: CN202010646021.6A
Authority: CN
Inventors: 宋帅杰; 姜敏; 吴舒意; 欧阳钟秀; 王顺有; 王兆燚
Original assignee: Huilv Landscape Construction Development Co ltd
Current assignee: Huilv Landscape Construction Development Co ltd
Priority date: 2020-07-07
Filing date: 2020-07-07
Publication date: 2020-12-29
Anticipated expiration: 2040-07-07
Also published as: CN112602492A; CN111648438A; CN112602492B

Abstract

The invention belongs to the technical field of rainwater gardens, and particularly relates to a rainwater garden for urban parks, which comprises a pit body, a covering layer, a planting layer, a sand layer, a gravel layer and an overflow pipe, wherein in the rainwater garden, in heavy rain weather, rainwater exceeding the normal purification range of the rainwater garden is introduced into the sand layer on the right side of a partition plate through a drainage unit, and the rainwater is purified to a certain extent through the sand layer on the right side, so that the rainwater is poorer than the rainwater filtered normally, but better than the rainwater not purified; compared with the traditional rainwater garden, the rainwater garden has the advantages that part of rainwater purified to a certain degree is added besides normal purified rainwater, and the purification effect is relatively good.

Description

Rainwater garden for city park

Technical Field

The invention belongs to the technical field of rainwater gardens, and particularly relates to a rainwater garden for a city park.

Background

The rainwater garden is a naturally formed or artificially excavated shallow-recessed green land, and is used for gathering and absorbing rainwater from a roof or the ground, filtering and purifying the rainwater through the comprehensive action of plants and sandy soil, and gradually permeating the rainwater into soil to contain underground water or make the rainwater supply urban water such as landscape water, toilet water and the like. Is an ecologically sustainable rain flood control and rain water utilization facility.

But impurities in the early stages of rain water can block the permeable layer.

The permeation layer is roughly divided into the following layers:

1. the covering layer is made of impurities such as leaves and the like covering the upper side, the covering layer is large in pore size, rainwater easily seeps down, and the covering layer has the function of moisturizing.

2. The planting layer is the root of the plant; when the layer is planted in the rainwater process, plant the infiltration speed that the layer can slow down the rainwater on the one hand, metal ion, nutrients, pollutant etc. in the rainwater on the other hand can be absorbed the degradation by the vegetation root on planting the layer. Because this layer is the place of vegetation, this layer soil property is soft relatively, so impurity in the rainwater is difficult for blockking up in this layer.

3. The sand bed, the sand bed is less because of the granule, and the rainwater is in the infiltration, and the great pollutant of some granules will be detained on this layer, blocks up the sand bed, influences the infiltration speed.

4. The gravel layer is larger due to pores and is positioned at the lowest layer; the layer is convenient for water storage, and the stored water flows out through the pipeline for secondary use.

Through the analysis, the particle pollutants in the rainwater are easy to gather in the gaps in the sand layer; and the water absorption effect of the rainwater garden is seriously influenced after the accumulated use for several years.

An ordinary rainwater garden is provided with an overflow pipe, if rainwater is more, redundant rainwater is drained through the overflow pipe, and the drained water is not purified; to some extent, the original intention of constructing a rainwater garden is violated.

So a rain garden for a city park is designed to solve the above problems.

Disclosure of Invention

In order to solve the defects in the prior art, the invention discloses a rainwater garden for a city park, which is realized by adopting the following technical scheme.

In the invention, the front, the back, the left and the right are respectively the front end of the first collecting pipe and the end of the second collecting pipe extending out of the pit body, and the left end of the overflow pipe extending out of the pit body.

A rainwater garden for city parks comprises a pit body, a covering layer, a planting layer, a sand layer, a gravel layer and an overflow pipe, wherein the gravel layer, the sand layer, the planting layer and the covering layer are sequentially distributed in the pit body from bottom to top; the overflow pipe is arranged at the upper end of the pit body and is positioned at the upper side of the planting layer; one end of the overflow pipe is positioned in the pit body, and the other end of the overflow pipe is positioned outside the pit body; the method is characterized in that: a partition plate is fixedly arranged in the pit body, and the vertical partition plate divides the gravel layer and the sand layer into a left part and a right part which are separated; the transverse partition plate also separates the sand layer on the right side from the planting layer, and one side of the transverse partition plate close to the pit wall is higher than one side of the transverse partition plate close to the vertical partition plate; the soil loosening mechanism is arranged in the sand layer positioned on the left side of the sand layer, and a plurality of drainage units which are used for introducing rainwater exceeding the normal bearing range into the sand layer on the right side of the partition plate are uniformly arranged on the upper side of the sand layer positioned on the right side of the sand layer; the upper end of the drainage unit penetrates out of the covering layer, and the lower end of the drainage unit is positioned at the lower side of the transverse partition plate.

A first collecting pipe and a second collecting pipe are arranged in the gravel layer in the pit body, and the first collecting pipe and the second collecting pipe are respectively positioned at the left side and the right side of the partition plate; one end of the first collecting pipe and one end of the second collecting pipe penetrate out of the pit body.

The soil loosening mechanism comprises guide mechanisms, driving mechanisms and pull ropes, wherein the two driving mechanisms are arranged on the front side and the rear side in the pit body, and the plurality of guide mechanisms are uniformly distributed on the left and the right and are arranged in the pit body; the driving mechanism consists of an installation rotating shaft and a winding wheel, the installation rotating shaft is rotatably installed in the pit body, and the winding wheel is fixedly installed on the installation rotating shaft; the guide mechanism consists of a fixed shaft and a guide wheel, wherein the fixed shaft is fixedly arranged in the pit body, and the guide wheel is rotatably arranged on the fixed shaft; two ends of the pull rope are respectively wound on two winding wheels of the two driving mechanisms, and the middle part of the pull rope is sequentially wound on guide wheels of the guide mechanisms distributed from left to right.

The drainage unit comprises a rain cover, a filter shell, a fixed ring shell, a partition plate, a water pipe, a spiral sheet, an installation plate and a connection plate, wherein the upper end of the water pipe is provided with a notch, the lower end of the water pipe penetrates through the upper end face of the partition plate and is positioned in a sand layer on the right side after being isolated by the partition plate, and the upper end of the water pipe penetrates through the planting layer and is positioned on the upper side of the planting layer; the fixed ring shell is fixedly arranged at the upper end of the water pipe, the isolation plate is slidably arranged on the fixed ring shell, and one end of the isolation plate is positioned in the fixed ring shell and matched with the notch on the water pipe; the filter shell is rotatably arranged on the upper side of the water pipe, the lower end of the rain cover is fixedly provided with an installation plate through a plurality of uniformly distributed connection plates, and the installation plate is rotatably arranged on the upper side of the filter shell in a detachable mode; a spiral sheet is fixedly arranged on the lower side of the rain cover, and the lower end of the spiral sheet is positioned in the filter shell; the filter shell is internally provided with sand with particles larger than the sand particles in the sand layer.

In a further improvement of the present technology, the pit body has a cement layer on a bottom surface thereof.

The driving mechanism also comprises a fixed shell and a top cover, wherein the fixed shell is fixedly arranged in the cement layer, and the lower end of the mounting rotating shaft is rotatably arranged in the fixed shell; the upper end of the mounting rotating shaft is provided with a hexagonal groove, and penetrates out of the planting layer to be positioned on the upper side of the planting layer; the top cover is nested at the upper end of the mounting rotating shaft.

The lower end of the fixed shaft in the guide mechanism is fixedly arranged in a cement layer.

As a further improvement of the technology, a third sealing ring is arranged between the fixed shell and the cement layer, and a second sealing ring is arranged between the installation rotating shaft and the fixed shell.

As a further improvement of the technology, first guide supports are respectively installed on one sides of the two winding wheels in the two driving mechanisms, and the lower ends of the two first guide supports are fixedly connected with the upper end of the cement layer through one fixed support.

Two second guide supports which play a role in guiding a pull rope entering and penetrating out of the guide wheel are respectively arranged on two sides of the guide wheel in the guide mechanism; and the two second guide supports are fixedly arranged on the corresponding fixed shafts.

As a further improvement of this technique, a plurality of scraping disks are attached to the cord.

As a further improvement of the technology, one end of the isolation plate is provided with a shielding circular plate, and the shielding circular plate is matched with the water pipe.

As a further improvement of the technology, the lower end of the filter shell is provided with a nesting ring groove, and the filter shell is nested and installed at the upper end of the water pipe through the nesting ring groove.

As a further improvement of the technology, a plurality of L-shaped nested arc plates are uniformly arranged on the lower side of the mounting plate in the circumferential direction; a plurality of installation arc plates are uniformly arranged at the upper end of the filter shell in the circumferential direction; the rain cover is rotatably arranged on the upper side of the filter shell through the matching of the installation arc plate on the lower side of the installation plate and the nested arc plate; the arc length of the nested arc plates is equal to the arc length of the gap between two adjacent mounting arc plates.

As a further improvement of the technology, the diameter of the spiral piece is nine-eighth of the inner diameter of the filter shell.

As a further improvement of the technology, the upper side of the cement layer is provided with a waterproof layer, and a first sealing ring is arranged between the fixed shell and the waterproof layer.

Compared with the traditional rainwater garden technology, the design of the invention has the following beneficial effects:

1. according to the invention, the soil loosening mechanism is arranged in the sand layer, and after the sand layer is used for a period of time, the soil loosening mechanism loosens the left sand layer, so that the purification effect is improved; when the sand layer is loosened, after the sand layer is dried in the sun, the two winding wheels are manually driven to rotate through the hexagonal wrench to drive the pull rope to slide in a reciprocating mode, and the pull rope slides to drive the scraping disc on the pull rope to slide in a reciprocating mode to loosen the sand layer.

2. According to the rainwater purification device, the drainage unit is designed, rainwater in heavy rain weather and beyond the normal purification range of the rainwater garden is introduced into the sand layer on the right side of the partition plate through the drainage unit, and the rainwater is purified to a certain degree through the sand layer on the right side, so that the rainwater is poorer than normal filtered rainwater, but better than unpurified rainwater; compared with the traditional rainwater garden, the rainwater garden has the advantages that part of rainwater purified to a certain degree is added besides normal purified rainwater, and the purification effect is relatively good.

Drawings

Fig. 1 is an external view of an entire part.

Fig. 2 is a schematic view of the overall component distribution.

Fig. 3 is a schematic distribution diagram of the scarification mechanism and the drainage unit.

Fig. 4 is a schematic structural view of the ripping mechanism.

Fig. 5 is a schematic view of the driving mechanism.

Fig. 6 is a schematic view of the guide mechanism.

Fig. 7 is an external view of the drainage unit.

FIG. 8 is a schematic view of a flight installation.

Fig. 9 is a schematic view of a rain cover structure.

Fig. 10 is a schematic view of a filter housing structure.

FIG. 11 is a schematic view of the spacer plate and water tube mating.

Fig. 12 is a schematic view of the combination of the soil loosening mechanism, the drainage unit and the soil layer.

Fig. 13 shows the effect of the water quality.

Number designation in the figures: 1. a pit body; 2. a drainage unit; 3. a soil loosening mechanism; 4. an overflow pipe; 5. a first collection tube; 6. a second collection tube; 7. a cover layer; 8. planting a layer; 9. a sand layer; 10. a gravel layer; 11. a partition plate; 12. fixing and supporting; 13. installing a rotating shaft; 14. a stationary case; 15. a cement layer; 16. a waterproof layer; 17. a first seal ring; 18. a second seal ring; 19. a third seal ring; 20. a top cover; 21. a guide mechanism; 22. a drive mechanism; 23. a hexagonal groove; 24. a winding wheel; 25. pulling a rope; 26. a scraping disc; 27. a first guide support; 28. a rain cover; 29. a filter shell; 30. a stationary ring housing; 31. a separator plate; 32. a water pipe; 33. a spiral sheet; 34. nesting the arc plates; 35. mounting a plate; 36. a connecting plate; 37. a shielding circular plate; 38. a notch; 39. installing an arc plate; 40. nesting the ring grooves; 41. a guide wheel; 42. a fixed shaft; 43. and a second guide support.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples or figures are illustrative of the present invention and are not intended to limit the scope of the present invention.

As shown in fig. 1, it comprises a pit body 1, a covering layer 7, a planting layer 8, a sand layer 9, a gravel layer 10 and an overflow pipe 4, wherein as shown in fig. 2 and 12, the gravel layer 10, the sand layer 9, the planting layer 8 and the covering layer 7 are distributed in the pit body 1 from bottom to top in sequence; the overflow pipe 4 is arranged at the upper end of the pit body 1 and is positioned at the upper side of the planting layer 8; one end of the overflow pipe 4 is positioned in the pit body 1, and the other end of the overflow pipe 4 is positioned outside the pit body 1; the method is characterized in that: as shown in fig. 1 and 3, a partition plate 11 is fixedly installed in the pit body 1, and the vertical partition plate 11 divides the gravel layer 10 and the sand layer 9 into two parts which are separated from each other left and right; the horizontal partition plate 11 also separates the right sand layer 9 from the planting layer 8, and one side of the horizontal partition plate 11 close to the pit wall is higher than one side close to the vertical partition plate 11; as shown in fig. 3, the soil loosening mechanism 3 is installed in the sand layer 9 on the left side of the two separated sand layers 9, and a plurality of drainage units 2 which can guide rainwater exceeding the normal bearing range into the sand layer 9 on the right side of the partition plate 11 are uniformly installed on the upper side of the sand layer 9 on the right side of the two separated sand layers 9; the upper end of the drainage unit 2 penetrates out of the covering layer 7, and the lower end of the drainage unit is positioned at the lower side of the transverse partition plate 11.

Rainwater entering the rainwater garden sequentially passes through the covering layer 7, the planting layer 8 and the sand layer 9 and enters the gravel layer 10 at the lowest layer; the infiltration speed of the rainwater is mainly determined by the planting layer 8; the infiltration speed of rainwater in the planting layer 8 is relatively slow, and the infiltration speed of rainwater in the sand layer 9 and the gravel layer 10 is relatively fast, so that basically no rainwater is retained in the sand layer 9, and the sand layer 9 is often in an unsaturated state; therefore, normal rainwater infiltration can be met through a part of the sand layer 9, and the whole sand layer 9 is not needed; therefore, the gravel layer 10 and the sand layer 9 are divided into a left part and a right part by the partition plate 11, and normal rainwater is purified by the planting layer 8 and the sand layer 9 on the left part.

According to the rainwater purification device, the drainage unit 2 is designed, rainwater in heavy rain weather and beyond the normal purification range of a rainwater garden is introduced into the sand layer 9 on the right side of the partition plate 11 through the drainage unit 2, and the rainwater is purified to a certain extent through the sand layer 9 on the right side, and is poorer than normal filtered rainwater but better than unpurified rainwater; compared with the traditional rainwater garden, the rainwater garden has the advantages that part of rainwater purified to a certain degree is added besides normal purified rainwater, and the purification effect is relatively good.

The overflow pipe 4 designed by the invention has the effect that in the case of heavy rainstorm, the rainwater in the pit body 1 exceeds the range which can be borne by the rainwater garden, and the rainwater cannot be completely absorbed and purified after passing through the drainage unit 2, so that the rainwater can only flow away through the overflow pipe 4 in the state, and the rainwater is relatively poor in non-purification.

As shown in fig. 1, a first collecting pipe 5 and a second collecting pipe 6 are installed in a gravel layer 10 in the pit body 1, and the first collecting pipe 5 and the second collecting pipe 6 are respectively positioned at the left side and the right side of a partition plate 11; one ends of the first collecting pipe 5 and the second collecting pipe 6 penetrate out of the pit body 1.

In the invention, rainwater which normally passes through the planting layer 8 and the sand layer 9 and is purified is collected into the water storage shell through the first collecting pipe 5 for secondary use. In the invention, the rainwater which is only filtered by the right sand layer 9 to a certain degree is collected by the second collecting shell and is used in places with low water quality requirements.

As shown in fig. 4, the ripping mechanism 3 includes a guide mechanism 21, two drive mechanisms 22, and a pull rope 25, wherein as shown in fig. 3, the two drive mechanisms 22 are installed on the front and rear sides in the pit body 1, and the plurality of guide mechanisms 21 are installed in the pit body 1 in a manner of being distributed evenly on the left and right; as shown in fig. 5, the driving mechanism 22 is composed of a mounting rotating shaft 13 and a winding wheel 24, the mounting rotating shaft 13 is rotatably mounted in the pit body 1, and the winding wheel 24 is fixedly mounted on the mounting rotating shaft 13; as shown in fig. 6, the guiding mechanism 21 is composed of a fixed shaft 42 and a guiding wheel 41, wherein the fixed shaft 42 is fixedly installed in the pit body 1, and the guiding wheel 41 is rotatably installed on the fixed shaft 42; as shown in fig. 4, both ends of the rope 25 are wound around the two winding wheels 24 of the two driving mechanisms 22, respectively, and the middle portion of the rope 25 is sequentially wound around the guide wheels 41 of the guide mechanisms 21 distributed to the left and right.

As shown in fig. 7 and 8, the drainage unit 2 includes a rain cover 28, a filter shell 29, a fixed ring shell 30, a partition plate 31, a water pipe 32, a spiral sheet 33, a mounting plate 35, and a connecting plate 36, wherein as shown in fig. 11, the upper end of the water pipe 32 has a gap 38, the lower end of the water pipe 32 passes through the upper end surface of the partition plate 11 and is located in the sand layer 9 on the right side after being isolated by the partition plate 11, and the upper end of the water pipe 32 passes through the planting layer 8 and is located on the upper side of the planting layer 8; as shown in fig. 8, the fixing ring housing 30 is fixedly installed at the upper end of the water pipe 32, as shown in fig. 11, the isolation plate 31 is slidably installed on the fixing ring housing 30, and one end of the isolation plate is located in the fixing ring housing 30 and is matched with the notch 38 on the water pipe 32; as shown in fig. 8 and 10, the filter shell 29 is rotatably mounted on the upper side of the water pipe 32, the lower end of the rain cover 28 is fixedly mounted with a mounting plate 35 through a plurality of uniformly distributed connecting plates 36, and the mounting plate 35 is rotatably mounted on the upper side of the filter shell 29 in a detachable manner; a spiral sheet 33 is fixedly arranged at the lower side of the rain cover 28, and the lower end of the spiral sheet 33 is positioned in the filter shell 29; the filter housing 29 has sand therein having a particle size greater than the sand particle size in the sand layer 9.

The rain cover 28 of the invention has the function of preventing rainwater from directly entering the water pipe 32, so that the rainwater enters the planting layer 8 and is firstly purified by the planting layer 8, and when more rainwater exists on the upper side of the planting layer 8, the rainwater can enter the water pipe 32 from the gap between the lower side of the rain cover 28 and the mounting plate 35.

In the invention, during heavy rain, rainwater on the upper side of the planting layer 8 is more, rainwater on the upper side cannot be purified normally, and the rainwater on the upper side is relatively turbid, so that the rainwater on the upper side enters the water pipe 32 from a gap between the lower side of the rain cover 28 and the mounting plate 35, is simply filtered through the sand layer 9 in the filter shell 29, and then enters the sand layer 9 on the right side of the partition plate 11 through the water pipe 32 to be purified to a certain degree.

As shown in fig. 3, the pit body 1 has a cement layer 15 on the bottom surface thereof. The cement layer 15 provided in the present invention serves to provide a fixed platform for the lower end of the drive mechanism 22.

As shown in fig. 5, the driving mechanism 22 further includes a fixed casing 14 and a top cover 20, wherein the fixed casing 14 is fixedly installed in the cement layer 15, and the lower end of the installation rotating shaft 13 is rotatably installed in the fixed casing 14; the upper end of the mounting rotating shaft 13 is provided with a hexagonal groove 23, and the upper end of the mounting rotating shaft 13 penetrates through the planting layer 8 and is positioned on the upper side of the planting layer 8; the top cover 20 is nested at the upper end of the mounting rotating shaft 13. The hexagonal groove 23 is used for facilitating the rotation of the mounting rotating shaft 13 driven by people through an auxiliary driving tool. The top cover 20 is used for preventing rainwater from entering the hexagonal groove 23 and corroding the upper end of the installation rotating shaft 13.

As shown in fig. 3, the lower end of the fixed shaft 42 of the guide mechanism 21 is fixedly mounted in the cement layer 15.

As shown in fig. 5, a third seal ring 19 is installed between the fixed casing 14 and the cement layer 15, and a second seal ring 18 is installed between the installation shaft 13 and the fixed casing 14. The third sealing ring 19 is used for sealing the fixed shell 14 and the cement layer 15; the second seal ring 18 seals between the mounting shaft 13 and the stationary housing 14.

As shown in fig. 5, the two driving mechanisms 22 are respectively provided with a first guiding support 27 at one side of the two winding wheels 24, and the lower ends of the two first guiding supports 27 are fixedly connected with the upper end of the cement layer 15 through a fixed support 12. In the invention, the first guide support 27 plays a role of guiding the outgoing pulling rope 25 and prevents the outgoing pulling rope 25 from being separated from the corresponding winding wheel 24.

As shown in fig. 6, two second guide supports 43 for guiding the pulling rope 25 entering and exiting the guide wheel 41 are respectively installed on both sides of the guide wheel 41 in the guide mechanism 21; the two second guide supports 43 are fixedly mounted on the corresponding fixed shafts 42. In the invention, the second guide support 43 plays a role in guiding the entering and exiting pull ropes 25 and prevents the pull ropes 25 from being separated from the corresponding guide wheels 41.

As shown in fig. 4, a plurality of scraping plates 26 are attached to the rope 25; in the invention, the loosening effect on the sand layer 9 is improved by the scraping disc 26; in the initial state, as for the scraping discs 26 on the pulling ropes 25 between any adjacent guide wheels 41 or between the guide wheels 41 and the winding wheels 24, the scraping discs 26 are uniformly arranged on one side of each pulling rope 25, and the scraping discs 26 are not arranged on the other side, so that the pulling rope 25 on the side where the scraping discs 26 are not arranged can be wound or pass through the guide wheels 41 when the winding wheels 24 on one side are wound.

As shown in fig. 11, the partition plate 31 has a shielding disk 37 at one end thereof, and the shielding disk 37 is engaged with the water pipe 32.

As shown in fig. 10, the filter shell 29 has a nesting ring groove 40 at the lower end thereof, and the filter shell 29 is nestingly mounted on the upper end of the water pipe 32 through the nesting ring groove 40.

As shown in fig. 9, a plurality of L-shaped nesting arc plates 34 are uniformly circumferentially mounted on the lower side of the mounting plate 35; a plurality of mounting arc plates 39 are uniformly arranged at the upper end of the filter shell 29 in the circumferential direction; the rain cover is rotatably arranged on the upper side of the filter shell 29 through the matching of the installation arc plate 39 on the lower side of the installation plate 35 and the nested arc plate 34; the arc length of the nesting arc plate 34 is equal to the arc length of the gap between two adjacent mounting arc plates 39.

When the rain cover 28 is installed, firstly, the L-shaped nested arc plates 34 on the lower side of the rain cover 28 are aligned to gaps between the adjacent installation arc plates 39 on the filter shell 29, the rain cover 28 is pressed downwards, the L-shaped nested arc plates 34 are clamped in the gaps between the adjacent installation arc plates 39, then the rain cover 28 is rotated, the lower ends of the L-shaped nested arc plates 34 are clamped on the lower sides of the installation arc plates 39, and the installation of the rain cover 28 is completed; when the filter casing is taken down, the rain cover 28 is firstly rotated, so that the L-shaped nested arc plates 34 on the lower side of the rain cover 28 are aligned with the gaps between the adjacent installation arc plates 39 on the filter casing 29, and then the rain cover 28 is taken up upwards.

The diameter of the spiral piece 33 is nine-eighth of the inner diameter of the filter shell 29; the stirring effect is improved.

As shown in fig. 3, a waterproof layer 16 is provided on the upper side of the cement layer 15, and a first gasket 17 is installed between the fixing case 14 and the waterproof layer 16. The waterproof layer 16 serves to prevent rainwater stored in the gravel layer 10 after being purified, and the first sealing ring 17 serves to seal between the fixing case 14 and the waterproof layer 16.

The auxiliary driving mechanism in the invention is a conventional device capable of outputting rotary motion through external power.

The horizontal partition plate 11 also separates the right sand layer 9 from the planting layer 8, and one side of the horizontal partition plate 11 close to the pit wall is higher than one side close to the vertical partition plate 11; the purpose of this design is to ensure that rainwater filtered through the planting layer 8 on the upper side of the partition 11 can flow into the left sand layer 9 under the effect of the installation of the transverse partition 11.

In the present invention, the entire drainage unit 2 is located on the upper side of the cover layer 7, which is designed for easy disassembly.

The specific working process is as follows: when the rainwater garden designed by the invention is used, rainwater can sequentially pass through the covering layer 7, the planting layer 8 and the sand layer 9 on the left side of the clapboard 11 to enter the gravel layer 10 on the left side of the clapboard 11 at the lowest layer in normal rainy days; the rainwater is purified by the planting layer 8 and the sand layer 9 at the left side part.

As shown in fig. 13, in heavy rain, rainwater exceeding the normal purification range of the rainwater garden enters the water pipe 32 from the gap between the lower side of the rain cover 28 and the mounting plate 35, is simply filtered by the sand layer 9 in the filter housing 29, and then enters the sand layer 9 on the right side of the partition plate 11 through the water pipe 32, and is purified to some extent by the sand layer 9 on the right side of the partition plate 11. This fraction is inferior to normal filtered rainwater, but better than unpurified rainwater.

After a plurality of times of heavy rains, the upper side of the sand layer 9 in the filter shell 29 is blocked by impurities, in this case, after the sand layer 9 in the filter shell 29 is dried in the sun, the rain cover 28 is manually rotated, the rain cover 28 drives the spiral sheet 33 to stir the sand layer 9 on the upper side in the filter shell 29, the blocked impurities are mixed in the sand layer 9 on the upper side of the filter shell 29 through stirring, and the sand layer 9 on the upper side of the filter shell 29 has a filtering function again. During stirring, the rain cover 28 is pressed, so that the upper end face of the L-shaped nested arc plate 34 is tightly attached to the upper end face of the installation arc plate 39, and the rain cover 28 is prevented from falling off. After more heavy rainstorms, the sand layer 9 cannot be filtered normally due to impurities remained in the upper sand layer 9 in the filter shell 29, at this time, one section of the partition plate 31 with the shielding circular plate 37 is manually pushed into the water pipe 32, so that the lower end of the water pipe 32 is sealed by the partition plate 31, and then the upper sand layer 9 in the filter shell 29 is taken out for replacement.

After using a period of time, just need not hard up left sand bed 9, when not hard up sand bed 9, at first wait for sand bed 9 to be dried in the sun the back, through two installation pivots 13 of auxiliary drive mechanism drive for two installation pivots 13 are rotatory reciprocating, and two installation pivots 13 are rotatory to drive two winding wheels 24 and are rotatory, drive stay cord 25 through two winding wheels 24 are rotatory and slide reciprocating, and the last frizing 26 reciprocating sliding of stay cord 25 slip drive, and then become flexible sand bed 9.

Claims

1. A rainwater garden for city parks comprises a pit body, a covering layer, a planting layer, a sand layer, a gravel layer and an overflow pipe, wherein the gravel layer, the sand layer, the planting layer and the covering layer are sequentially distributed in the pit body from bottom to top; the overflow pipe is arranged at the upper end of the pit body and is positioned at the upper side of the planting layer; one end of the overflow pipe is positioned in the pit body, and the other end of the overflow pipe is positioned outside the pit body; the method is characterized in that: a partition plate is fixedly arranged in the pit body, and the vertical partition plate divides the gravel layer and the sand layer into a left part and a right part which are separated; the transverse partition plate also separates the sand layer on the right side from the planting layer, and one side of the transverse partition plate close to the pit wall is higher than one side of the transverse partition plate close to the vertical partition plate; the soil loosening mechanism is arranged in the sand layer positioned on the left side of the sand layer, and a plurality of drainage units which are used for introducing rainwater exceeding the normal bearing range into the sand layer on the right side of the partition plate are uniformly arranged on the upper side of the sand layer positioned on the right side of the sand layer; the upper end of the drainage unit penetrates out of the covering layer, and the lower end of the drainage unit is positioned at the lower side of the transverse partition plate;

a first collecting pipe and a second collecting pipe are arranged in the gravel layer in the pit body, and the first collecting pipe and the second collecting pipe are respectively positioned at the left side and the right side of the partition plate; one ends of the first collecting pipe and the second collecting pipe penetrate out of the pit body;

the soil loosening mechanism comprises guide mechanisms, driving mechanisms and pull ropes, wherein the two driving mechanisms are arranged on the front side and the rear side in the pit body, and the plurality of guide mechanisms are uniformly distributed on the left and the right and are arranged in the pit body; the driving mechanism consists of an installation rotating shaft and a winding wheel, the installation rotating shaft is rotatably installed in the pit body, and the winding wheel is fixedly installed on the installation rotating shaft; the guide mechanism consists of a fixed shaft and a guide wheel, wherein the fixed shaft is fixedly arranged in the pit body, and the guide wheel is rotatably arranged on the fixed shaft; two ends of the pull rope are respectively wound on two winding wheels of the two driving mechanisms, and the middle part of the pull rope is sequentially wound on guide wheels of the guide mechanisms which are distributed left and right;

2. A rainwater garden for city parks according to claim 1, characterised in that: a cement layer is arranged on the bottom surface of the pit body;

the driving mechanism also comprises a fixed shell and a top cover, wherein the fixed shell is fixedly arranged in the cement layer, and the lower end of the mounting rotating shaft is rotatably arranged in the fixed shell; the upper end of the mounting rotating shaft is provided with a hexagonal groove, and penetrates out of the planting layer to be positioned on the upper side of the planting layer; the top cover is nested at the upper end of the mounting rotating shaft;

3. A rainwater garden for a city park according to claim 2, wherein: and a third sealing ring is arranged between the fixed shell and the cement layer, and a second sealing ring is arranged between the installation rotating shaft and the fixed shell.

4. A rainwater garden for a city park according to claim 2, wherein: first guide supports are respectively arranged on one sides of two winding wheels in the two driving mechanisms, and the lower ends of the two first guide supports are fixedly connected with the upper end of the cement layer through a fixed support;

5. A rainwater garden for city parks according to claim 1, characterised in that: the pull rope is provided with a plurality of scraping discs.

6. A rainwater garden for city parks according to claim 1, characterised in that: one end of the isolation plate is provided with a shielding circular plate which is matched with the water pipe.

7. A rainwater garden for city parks according to claim 1, characterised in that: the lower end of the filter shell is provided with a nesting ring groove, and the filter shell is nested and installed at the upper end of the water pipe through the nesting ring groove.

8. A rainwater garden for city parks according to claim 1, characterised in that: a plurality of L-shaped nested arc plates are uniformly arranged on the lower side of the mounting plate in the circumferential direction; a plurality of installation arc plates are uniformly arranged at the upper end of the filter shell in the circumferential direction; the rain cover is rotatably arranged on the upper side of the filter shell through the matching of the installation arc plate on the lower side of the installation plate and the nested arc plate; the arc length of the nested arc plates is equal to the arc length of the gap between two adjacent mounting arc plates.

9. A rainwater garden for city parks according to claim 1, characterised in that: the diameter of the spiral piece is nine-eighth of the inner diameter of the filter shell.

10. A rainwater garden for a city park according to claim 2, wherein: the waterproof layer is arranged on the upper side of the cement layer, and a first sealing ring is arranged between the fixing shell and the waterproof layer.