CN111005428B

CN111005428B - Sponge city concave greenbelt

Info

Publication number: CN111005428B
Application number: CN201911368329.2A
Authority: CN
Inventors: 胡志强; 陈跃利; 林奇晗; 聂会英; 黄水传
Original assignee: Xiamen Yiqiaoyuan Greening Engineering Co ltd
Current assignee: Xiamen Yiqiaoyuan Greening Engineering Co ltd
Priority date: 2019-12-26
Filing date: 2019-12-26
Publication date: 2020-10-20
Anticipated expiration: 2039-12-26
Also published as: CN111005428A

Abstract

The invention relates to the technical field of sponge cities, in particular to a concave green land in a sponge city, which has the technical scheme that: the water storage and sand settling green land comprises a green land body, a water storage cavity and a water storage part, wherein the green land body is lower than a road and is obliquely and downwards arranged, a curb is arranged at the junction of the green land body and the road, the curb is provided with a water through hole, and the green land body is provided with a sand settling device; the green land comprises a plurality of green land bodies, a plurality of water storage cavities are arranged at intervals along the inclined direction of the green land bodies to divide the green land bodies into a plurality of green land units, and a confluence channel is communicated between every two adjacent water storage cavities; the green land unit is provided with an irrigation assembly, and the irrigation assembly is communicated with a water storage cavity positioned at the upper end of the green land unit; the water storage cavity which is positioned at the position of the green land body closest to the road junction is communicated with the sand settling device, the water storage piece is arranged at the lowest point of the green land body, and the confluence channel is communicated with the water storage piece. The concave greenbelt can improve the utilization rate of the height difference generated by the inclination of the greenbelt.

Description

Sponge city concave greenbelt

Technical Field

The invention relates to the technical field of sponge cities, in particular to a concave greenbelt of a sponge city.

Background

The sponge city is a new generation of city rainfall flood management concept, and means that the city can be like a sponge, and has good elasticity in the aspects of adapting to environmental changes, coping with natural disasters caused by rainwater and the like. The concave greenbelt is a mode for building a sponge city, is represented as a public greenbelt with the height lower than the surrounding road surface, and mainly utilizes an open space to receive and store rainwater so as to achieve the effect of reducing rainwater runoff emission.

Chinese patent with publication number CN207538184U discloses a recessed green land structure, which comprises a recessed green land portion, a water storage tank and an adjusting water tank, wherein the water storage tank and the adjusting water tank are located at two sides of the recessed green land portion, a first water inlet of the water storage tank and a second water inlet of the adjusting water tank are located at the upper portion of the recessed green land portion, and the height of the second water inlet is higher than that of the first water inlet. The height of the concave green land portion in the concave green land is lower than the water inlet of the water storage tank and the water adjusting tank, when rainfall is small, rainwater is directly used for watering the concave green land portion and is discharged to the underground, and when the rainfall is large, the rainwater can be stored in the water storage tank and the water adjusting tank, so that the rainwater utilization rate is improved.

The above prior art solutions have the following drawbacks: the redundant rainwater is completely stored in the water storage tank and the regulating water tank, when the stored rainwater is needed to water green vegetation, the rainwater can only be pumped out by using an electric energy driving water pump, and the height difference generated by the inclination of the green land can not be effectively utilized.

Disclosure of Invention

In view of the shortcomings of the prior art, it is an object of the present invention to provide a sponge-type urban sunken green land that can improve the utilization of the height difference caused by the inclination of the green land itself.

The above object of the present invention is achieved by the following technical solutions: a sponge city concave greenbelt comprises a greenbelt body, a water storage cavity and a water storage part, wherein the greenbelt body is lower than a road, the greenbelt body is obliquely and downwards arranged from the junction of the greenbelt body and the road along the direction far away from the road, a kerbstone is arranged at the junction of the greenbelt body and the road along the length direction of the road, the kerbstone is provided with a water through hole, and a sand setting device is arranged at the position, close to the water through hole, of the greenbelt body; the green land water storage device comprises a green land body, water storage cavities and a water collecting channel, wherein the water storage cavities are arranged along the length direction of a road, the number of the water storage cavities is multiple, the water storage cavities are distributed at intervals along the inclined direction of the green land body so as to divide the green land body into a plurality of step-shaped green land units, and the water collecting channel is communicated between every two adjacent water storage cavities; the green land unit is provided with an irrigation assembly, the irrigation assembly is used for irrigating the vegetation of the green land unit, and the irrigation assembly is communicated with a water storage cavity positioned at the upper end of the green land unit; the water storage cavity which is positioned at the position, closest to the road junction, of the green space body is communicated with the sand settling device, the water storage piece is arranged at the lowest point of the green space body, and the confluence channel is communicated with the water storage piece.

By adopting the technical scheme, in the rainfall process, rainwater falling on a road flows into the green space body through the water through hole on the curb stone, and firstly enters the sand settling device for deposition treatment, so that the content of sand carried in the rainwater is reduced; then, rainwater flows from the sand setting device to a water storage cavity closest to the junction of the road, when water in the water storage cavity is stored to a certain amount, redundant rainwater flows to the next water storage cavity slightly lower than the water storage cavity by using the confluence channel, rainwater can be stored in the water storage cavities in sequence, and redundant rainwater is remained and continues to flow downwards to the water storage part for storage; when the vegetation in the greenery patches body is irrigated to needs, at first usable every greenery patches unit and the difference in height between the last ladder water storage chamber, directly through irrigating the subassembly with the rainwater drainage that stores in the water storage chamber to the vegetation of greenery patches unit on to the realization is to the utilization of the difference in height that greenery patches self slope produced, after the rainwater of piling up in the water storage chamber is used up, again to the rainwater of storing in the water storage spare extract the utilization.

Preferably, the sand setting device comprises a sand setting well, the upper end of the sand setting well is open and provided with a rainwater grate, the side wall of the sand setting well is provided with an overflow hole communicated with the water storage cavity, and the height of the overflow hole is higher than the bottom of the sand setting well and the bottom of the water storage cavity.

By adopting the technical scheme, the sand-settling well is used for receiving rainwater, the overflow holes can guide rainwater on the upper layer part of the sand-settling well to the water storage cavity for water storage, and debris such as sand, gravel and the like in the rainwater can be deposited at the bottom of the sand-settling well under the action of gravity, so that the rainwater can be deposited; meanwhile, the rainwater grate can have a coarse filtering effect on rainwater, so that the situation that sundries such as branches and leaves, plastic bags and the like in the rainwater enter the sand trap to block an overflow hole is reduced.

Preferably, the confluence channel comprises a pebble bottom layer and two flanges, the pebble bottom layer is arranged along the inclined direction of the green land body, and the two flanges are respectively arranged on two sides of the pebble bottom layer in the width direction; the wall of the water storage cavity close to the confluence channel is provided with a confluence port communicated with the confluence channel, the confluence port is higher than the bottom of the water storage cavity, and the lowest part of the confluence port is flush with the upper end face of the pebble bottom layer.

By adopting the technical scheme, the pebble bottom layer formed by paving the pebbles has the rainwater scouring resistance, so that the condition that rainwater scours the bottom of the confluence channel to damage the confluence channel can be reduced; meanwhile, when the rain falls, the pebble bottom layer can also be used as a small diameter of the green land where people walk, so that the green land body has better playability.

Preferably, the overflow hole and the confluence port are both provided with a filter plate.

Through adopting above-mentioned technical scheme, the debris in the reducible rainwater of setting of filter pass through the overflow hole or converge the mouth and enter into the condition of retaining the chamber and be not convenient for clear up.

Preferably, the upper end of the water storage cavity is provided with a play path, and the play path is a permeable concrete layer.

By adopting the technical scheme, the playing path can be used for people to play and walk, and a small amount of rainwater can be inevitably left on the playing path after the rainfall process; and the concrete layer that permeates water has the water permeability to make after the rainfall, can ooze this a small amount of rainwater to the retaining chamber fast in, make people can conveniently walk, walk on the route of playing, with the fresh air after breathing the rain.

Preferably, the irrigation assembly comprises an irrigation main pipe and an irrigation branch pipe, the irrigation main pipe is arranged along the inclined direction of the green land body, and one end of the irrigation main pipe is communicated with the water storage cavity and is provided with a ball valve; the quantity of irrigation branch pipe is many, many the irrigation branch pipe sets up along the length direction interval that irrigates the person in charge, just the irrigation branch pipe is linked together with irrigation the person in charge, the irrigation branch pipe is equipped with a plurality of delivery port.

Through adopting above-mentioned technical scheme, open and irrigate the ball valve on being responsible for, utilize to irrigate and be responsible for and derive the rainwater of retaining the intracavity accumulation, then utilize the delivery port on the irrigation branch pipe to irrigate the rainwater to the vegetation on, realized promptly that the subassembly irrigates the effect of vegetation.

Preferably, the water storage part is a water storage tank, a deep water pump is arranged at the bottom of the water storage tank and connected with a water supply pipe, and the water supply pipe is communicated with the irrigation main pipe.

Through adopting above-mentioned technical scheme, the tank provides storage space for the rainwater, and when the rainwater of piling up in the retaining chamber used up, can use the deep-water pump to carry the rainwater in the tank to irrigating to be responsible for through the flow pipe, is used for irrigating the vegetation on the greenery patches body with the rainwater.

Preferably, the tank is connected with a drain pipe, the communication position of the drain pipe and the tank is higher than the bottom of the tank, and the drain pipe is communicated with a municipal drainage main pipe.

Through adopting above-mentioned technical scheme, when actual rainfall is great, the drain pipe can be discharged the rainwater in the tank into in the municipal drainage is responsible for and discharges, reduces the rainwater and discharges and influence the condition that vegetation normally grows in the greenery patches body untimely.

Preferably, the pebble bottom layer is provided with a flow guide belt, the flow guide belt is in a herringbone shape, the top of the middle of the flow guide belt faces the direction of the road, and the end parts of the two sides of the flow guide belt face the confluence openings of the two sides of the pebble bottom layer.

By adopting the technical scheme, when rainwater flows in the confluence groove, the drainage belt can drain the rainwater so as to drain the rainwater to the confluence opening, so that the rainwater can more easily enter the water storage cavity from the confluence opening; meanwhile, the drainage belt can also play a role in buffering and decelerating the rainwater so as to reduce the strong scouring condition of the pebble bed caused by too fast flow rate of the rainwater.

Preferably, an opening at the upper end of the sand sediment trap is provided with a containing groove for containing the rainwater grate, and a cement mortar cushion layer is arranged at the bottom of the containing groove.

Through adopting above-mentioned technical scheme, utilize the storage tank to the holding effect of rainwater grate, can play fine limiting displacement to the rainwater grate, reduce the rainwater grate and receive rainwater impact skew and influence the condition that rainwater grate self filtered the function, in addition, the setting of cement mortar bed course can play certain cushioning effect between rainwater grate and the grit chamber, reduces the rainwater grate and receives vertical pressure direct transfer in the lateral wall of grit chamber and damage the condition of grit chamber.

In summary, the invention includes at least one of the following beneficial technical effects:

1. by utilizing the height difference between each green land unit and the previous step water storage cavity, rainwater stored in the water storage cavity can be directly drained to the vegetation of the green land unit through the irrigation assembly, so that the utilization of the height difference generated by the inclination of the green land is realized;

2. the pebble bottom layer at the bottom of the confluence groove and the play path at the upper end of the water storage cavity can be used as the small diameter of the green land for people to walk, so that the play performance of the green land body is improved;

3. the tank provides storage space for the rainwater, and when the rainwater of piling up in the retaining chamber used up, can use the deep-water pump to carry the rainwater in with the tank to irrigate to be responsible for through the flow pipe, is used for the rainwater to irrigate the vegetation on the greenery patches body.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Fig. 2 is a partial schematic view of an embodiment of the present invention.

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

Fig. 4 is an enlarged view of a portion B in fig. 2.

Reference numerals: 1. a green land body; 1a, a green space unit; 2. a water storage cavity; 3. a water storage tank; 3a, a grid plate; 4. a curb; 4a, a water through port; 5. a confluence passage; 5a, a pebble bottom layer; 5b, a flange; 5c, horizontally paving a section; 5d, obliquely paving the section; 6. a sand-setting well; 6a, overflow holes; 7. a rainwater grate; 8. a flow converging port; 9. a filter plate; 10. a play path; 10a, a pervious concrete layer; 11. irrigating a main pipe; 12. an irrigation branch pipe; 13. a drainage band; 14. a water supply pipe; 15. a drain pipe; 16. a road; 17. a containing groove; 17a and a cement mortar cushion layer.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1, the sponge city recessed green land disclosed by the invention comprises a green land body 1, a water storage cavity 2 and a water storage tank 3, wherein the height of the green land body 1 is lower than that of a road 16, and the green land body 1 is in a downward inclined state from the junction of the green land body 1 and the road 16 along the direction far away from the road 16; meanwhile, the border between the green land body 1 and the road 16 is paved with the kerbstone 4 along the length direction of the road 16, the kerbstone 4 is paved along the length direction of the road 16, and the kerbstone 4 is provided with a water opening 4 a. Correspondingly, a sand setting device is arranged on the green land body 1 near the water through port 4 a.

Referring to fig. 2 and 3, specifically, the sand settling device comprises a sand settling well 6, the sand settling well 6 is a cuboid cavity with an open upper end, and a rainwater grate 7 for roughly filtering rainwater is installed at an opening at the upper end of the sand settling well 6. In addition, an accommodating groove 17 for accommodating the rainwater grate 7 is further formed at the opening at the upper end of the sand sediment well 6, and a cement mortar cushion layer 17a is laid at the bottom of the accommodating groove 17.

Referring to fig. 2 and 3, the water storage cavities 2 are laid on the green land body 1 along the length direction of the road 16, the number of the water storage cavities 2 is multiple, and the water storage cavities 2 are arranged at intervals along the inclined direction of the green land body 1 to divide the green land body 1 into a plurality of step-shaped green land units 1 a. In this embodiment, the number of the water storage cavities 2 is two, one water storage cavity 2 with a high terrain among the two water storage cavities 2 is located at the uppermost end of the green land body 1, the other water storage cavity 2 divides the green land body 1 into two step-shaped green land units 1a, and the upper end surfaces of the two green land units 1a are horizontal. And, the upper ends of two retaining chambeies 2 are the route of playing 10 that permeable concrete layer 10a laid for people can conveniently walk, walk on the route of playing 10 after the rainfall, with breathe the fresh air after the rain.

In addition, the water storage cavity 2 that is located the top is linked together with sand sediment well 6, and is concrete, sand sediment well 6 is located the intracavity of the water storage cavity 2 of the top, and sand sediment well 6 is close to the lateral wall of road 16 and laminates mutually with the chamber wall of water storage cavity 2, and simultaneously, overflow hole 6a that is linked together with the water storage cavity 2 of the top is all seted up to 6 remaining three lateral walls of sand sediment well, and overflow hole 6a highly is higher than the bottom of water storage cavity 2 and sand sediment well 6, in order to save the rainwater water conservancy diversion after 6 sedimentation effects of sand sediment well to water storage cavity 2 through overflow hole 6 a. In addition, in order to reduce the inconvenience of cleaning the rainwater impurities entering the water storage cavity 2 through the overflow hole 6a, a filter plate 9 is fixedly arranged on the overflow hole 6 a.

Referring to fig. 2 and 4, a confluence channel 5 is further laid on the green body 1 along the inclined direction of the green body 1, in this embodiment, the confluence channel 5 is a channel in which horizontal laying sections 5c and inclined laying sections 5d are alternately laid, and the bottom of the horizontal laying section 5c of the confluence channel 5 is lower than the upper end surface of the green unit 1 a. Specifically, the confluence channel 5 comprises a pebble bottom layer 5a and a rib 5b, wherein the pebble bottom layer 5a is laid at the bottom of the confluence channel 5 along the length direction of the confluence channel 5; the pebble bottom layer 5a is formed by paving pebbles resistant to rain wash, so that the damage of rain wash to the confluence channel 5 in the rainfall process can be reduced; on the other hand, when it does not rain, the pebble bed 5a can also be used as a small diameter of the green space where people walk, so that the green space body 1 has better playability. Meanwhile, the flanges 5b are laid on the inclined laying sections 5d of the confluence channel 5, the number of the baffles is two, and the two flanges 5b are respectively positioned on two sides of the width direction of the pebble bottom layer 5a so as to play a good confluence guiding role for rainwater of the inclined laying sections 5d of the confluence channel 5.

Referring to fig. 2 and 4, one end of the confluence channel 5 abuts against the curb 4, the other end extends to the lowest position of the green space body 1, correspondingly, the confluence channel 5 is also intersected with the two water storage cavities 2, the confluence channel 5 and the water storage cavities 2 are intersected with the horizontal laying section 5c of the confluence channel 5, a confluence port 8 communicated with the confluence channel 5 is arranged on the cavity wall of the water storage cavity 2 close to the confluence channel 5, the height of the confluence port 8 is higher than the bottom of the water storage cavity 2, and the lowest point of the confluence port 8 is flush with the end surface of the pebble bottom layer 5 a. The confluence opening 8 can be used for allowing rainwater in the confluence channel 5 to enter the water storage cavity 2 and also can be used for allowing rainwater in the water storage cavity 2 to flow into the confluence channel 5, so that the confluence channel 5 is utilized to communicate the water storage cavities 2 with different terrains on the green body 1. After enough rainwater is accumulated in the upper water storage cavity 2, rainwater can flow to the confluence channel 5 through the confluence port 8, then flows downwards along the length direction of the confluence channel 5, and flows to the lower water storage cavity 2 through the confluence port 8 communicated with the lower water storage cavity 2 through the confluence channel 5, so that the effect of sequentially storing the water in the water storage cavity 2 from top to bottom can be achieved. And, the mouth 8 department that converges also installs filter 9 to the debris that reduce the rainwater enters into the condition that impoundment chamber 2 and inconvenient clearance through the mouth 8 that converges.

In addition, a herringbone drainage belt 13 is further laid on the pebble bottom layer 5a of the horizontal laying section 5c, the top of the herringbone of the drainage belt 13 faces the direction of a road 16, two end parts of the herringbone of the drainage belt 13 respectively face the confluence ports 8 on two sides of the pebble bottom layer 5a, and rainwater can be drained through the drainage belt 13 so as to be better drained to the confluence ports 8; on the other hand, the drainage belt 13 can also play a role in buffering and decelerating the rainwater so as to reduce the situation that the pebble bottom layer 5a is strongly washed by the too fast rainwater flow speed.

Referring to fig. 1 and 2, an irrigation assembly is mounted on the green land unit 1a, and is used for irrigating vegetation planted on the green land unit 1a, specifically, the irrigation assembly includes an irrigation main pipe 11 and an irrigation branch pipe 12, wherein the irrigation main pipe 11 is mounted on the upper end surface of the green land unit 1a along the inclined direction of the green land body 1; and, the one end that irrigates main pipe 11 and keep away from water storage cavity 2 is the seal, irrigates the other end of main pipe 11 and is linked together and install the ball valve (not shown in the figure) that is used for opening and close irrigation main pipe 11 rivers break-make with water storage cavity 2. Simultaneously, the quantity of irrigation branch pipe 12 is many, many irrigation branch pipes 12 are installed on greenery patches body 1 along the length direction interval that irrigation was responsible for 11, and irrigation branch pipe 12 is responsible for 11 with the irrigation, in addition, a plurality of delivery port (not shown in the figure) has all been seted up on every irrigation branch pipe 12, with on the rainwater drainage that stores in the water storage chamber 2 to greenery patches body 1's vegetation through the delivery port on irrigation branch pipe 12, thereby realize utilizing the difference in height to store the rainwater and be used for irrigating the effect of vegetation, reduce the electric energy and use and play energy-conserving effect.

Referring to fig. 1 and 2, the water storage tank 3 is a long cavity with an open upper end so as to directly receive and store rainwater in the green land, specifically, the water storage tank 3 is arranged at the lowest point of the green land body 1 along the length direction of the road 16, and the water storage tank 3 is communicated with one end of the confluence channel 5 far away from the road 16. Meanwhile, a grating plate is also arranged at an opening at the upper end of the water storage tank 3 to play a certain role in filtering rainwater; furthermore, a deep water pump (not shown) is installed at the bottom of the water storage tank 3, a water supply pipe 14 is connected to the deep water pump, and the water supply pipe 14 is communicated with the main irrigation pipe 11 on the green space unit 1 a. When the rainwater accumulated in the water storage cavity 2 is used up, the rainwater in the water storage tank 3 can be conveyed to the main irrigation pipe 11 through the water conveying pipe 14 by using the deep water pump, and the rainwater is used for irrigating the vegetation on the green land body 1. In addition, the water storage tank 3 is also connected with a drain pipe 15, and the communication position of the drain pipe 15 and the water storage tank 3 is positioned at the position of the water storage tank 3 close to the upper end opening, so that more rainwater can be stored in the water storage tank 3; and the other end of the drain pipe 15 is communicated with the municipal drainage main pipe, and when the actual rainfall is large, the drain pipe 15 can drain the redundant rainwater in the water storage tank 3 into the municipal drainage main pipe for discharging.

The implementation principle of the embodiment is as follows: in the rainfall process, rainwater on the road 16 flows into the sand-settling well 6 through the water openings 4a on the kerbstone 4 for sedimentation, and then flows into the uppermost water storage cavity 2 through the overflow holes 6 a; after enough rainwater is accumulated in the upper water storage cavity 2, rainwater can flow to the confluence channel 5 through the confluence port 8, then flows downwards along the length direction of the confluence channel 5, and flows to the lower water storage cavity 2 through the confluence port 8 communicated with the lower water storage cavity 2 through the confluence channel 5, so that the effect of sequentially fully storing the water storage cavity 2 from top to bottom can be achieved, and the rainwater is finally discharged into the water storage tank 3 for storage.

Meanwhile, the rainwater on the green land unit 1a can flow downwards step by step and finally flows into the water storage tank 3 for storage, and if the rainfall is large, the drain pipe 15 in the water storage tank 3 can drain the redundant rainwater in the water storage tank 3 into the municipal drainage main pipe for drainage. In addition, after rainfall is finished, the confluence channel 5 can quickly discharge rainwater downwards due to the arrangement of the inclined laying section 5d so as to form a small green space diameter for people to form and walk; the play path 10 formed by laying the permeable concrete layer 10a on the upper end of the water storage cavity 2 can seep rainwater into the water storage cavity 2, so that the good walking road section is provided for people, and the play function of improving the play performance of the green land body 1 is achieved.

When the vegetation in the greenery patches unit 1a needs to be irrigated, utilize the irrigation of being responsible for 11 with the water storage chamber 2 intercommunication to be responsible for on the rainwater drainage to irrigation branch pipe 12 with the storage in the water storage chamber 2 to the vegetation in the greenery patches unit 1a that the relief is less than water storage chamber 2 irrigates, thereby realizes utilizing the difference in height to store the rainwater and be used for irrigating the effect of vegetation, reduces the electric energy and uses and play energy-conserving effect.

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

Claims

1. The utility model provides a concave formula greenery patches in sponge city which characterized in that: the water storage and sand settling green land comprises a green land body (1), a water storage cavity (2) and a water storage part, wherein the green land body (1) is lower than a road (16), the green land body (1) is obliquely and downwards arranged from the junction of the green land body (1) and the road (16) along the direction far away from the road (16), a kerbstone (4) is arranged at the junction of the green land body (1) and the road (16) along the length direction of the road (16), a water through hole (4a) is formed in the kerbstone (4), and a sand settling device is arranged at the position, close to the water through hole (4a), of the green land body (1); the water storage cavities (2) are arranged along the length direction of a road (16), the number of the water storage cavities (2) is multiple, the water storage cavities (2) are arranged at intervals along the inclined direction of the green land body (1) to divide the green land body (1) into a plurality of step-shaped green land units (1a), and a confluence channel (5) is communicated between every two adjacent water storage cavities (2); the green land unit (1a) is provided with an irrigation assembly, the irrigation assembly is used for irrigating the vegetation of the green land unit (1a), and the irrigation assembly is communicated with a water storage cavity (2) positioned at the upper end of the green land unit (1 a); the water storage cavity (2) which is positioned at the position of the green land body (1) closest to the junction of the road (16) is communicated with the sand settling device, the water storage piece is arranged at the lowest point of the green land body (1), and the confluence channel (5) is communicated with the water storage piece;

the converging channel (5) comprises a pebble bottom layer (5a), the pebble bottom layer (5a) is arranged along the inclined direction of the green land body (1), a converging port (8) communicated with the converging channel (5) is arranged on the wall, close to the converging channel (5), of the water storage cavity (2), the height of the converging port (8) is higher than the bottom of the water storage cavity (2), and the lowest position of the converging port (8) is flush with the upper end face of the pebble bottom layer (5 a);

the upper end of the water storage cavity (2) is provided with a play path (10), and the play path (10) is connected with the confluence channel (5).

2. The sponge urban sunken greenbelt of claim 1, wherein: the sand setting device comprises a sand setting well (6), the upper end of the sand setting well (6) is open and provided with a rainwater grate (7), the side wall of the sand setting well (6) is provided with an overflow hole (6a) communicated with the water storage cavity (2), and the height of the overflow hole (6a) is higher than the bottom of the sand setting well (6) and the bottom of the water storage cavity (2).

3. The sponge urban sunken greenbelt of claim 2, wherein: the confluence channel (5) further comprises two flanges (5b), and the two flanges (5b) are respectively arranged on two sides of the width direction of the pebble bottom layer (5 a).

4. A sponge urban sunken greenbelt according to claim 3, wherein: the overflow holes (6a) and the confluence ports (8) are both provided with filter plates (9).

5. The sponge urban sunken greenbelt of claim 1, wherein: the playing path (10) is a pervious concrete layer (10 a).

6. The sponge urban sunken greenbelt of claim 1, wherein: the irrigation assembly comprises an irrigation main pipe (11) and irrigation branch pipes (12), the irrigation main pipe (11) is arranged along the inclined direction of the green land body (1), one end of the irrigation main pipe (11) is communicated with the water storage cavity (2) and is provided with a ball valve; the quantity of irrigation branch pipe (12) is many, many irrigation branch pipe (12) are along the length direction interval setting of irrigating the person in charge (11), just irrigation branch pipe (12) are responsible for (11) with the irrigation and are linked together, irrigation branch pipe (12) are equipped with a plurality of delivery port.

7. The sponge urban sunken greenbelt of claim 6, wherein: the water storage part is a water storage tank (3), a deep water pump is arranged at the bottom of the water storage tank (3), the deep water pump is connected with a water delivery pipe (14), and the water delivery pipe (14) is communicated with an irrigation main pipe (11).

8. The sponge urban depressed greenbelt of claim 7, wherein: the water storage tank (3) is connected with a drain pipe (15), the communication position of the drain pipe (15) and the water storage tank (3) is higher than the bottom of the water storage tank (3), and the drain pipe (15) is communicated with a municipal drainage main pipe.

9. A sponge urban sunken greenbelt according to claim 3, wherein: the pebble bed (5a) is provided with a flow guiding belt (13), the flow guiding belt (13) is in a herringbone shape, the top of the middle of the flow guiding belt (13) faces the direction of a road (16), and the end parts of two sides of the flow guiding belt (13) face the confluence ports (8) of two sides of the pebble bed (5 a).

10. The sponge urban sunken greenbelt of claim 2, wherein: an opening at the upper end of the sand sediment well (6) is provided with a containing groove (17) for containing the rainwater grate (7), and the bottom of the containing groove (17) is provided with a cement mortar cushion layer (17 a).