CN111535098A

CN111535098A - Rainwater drainage system for green belts and sidewalks of town roads and construction method

Info

Publication number: CN111535098A
Application number: CN201911169623.0A
Authority: CN
Inventors: 鞠涛; 刘园园; 刘勇; 张瑜
Original assignee: Xiangyang Road And Bridge Construction Group Co ltd
Current assignee: Xiangyang Road And Bridge Construction Group Co ltd
Priority date: 2019-11-26
Filing date: 2019-11-26
Publication date: 2020-08-14

Abstract

A rainwater drainage system for urban road greenbelts and sidewalks and a construction method relate to the technical field of urban construction and comprise a motor vehicle lane, a greenbelt, a non-motor vehicle lane and a sidewalk, wherein the surface of one side of the greenbelt is connected with the motor vehicle lane through a first vertical kerbstone, the other side of the greenbelt is connected with one side of the non-motor vehicle lane through a second vertical kerbstone, the other side of the non-motor vehicle lane is connected with the sidewalk through a third vertical kerbstone, a rainwater well is arranged at the bottom of one side of the motor vehicle lane and the non-motor vehicle lane, an overflow rainwater well is arranged at the bottom of one side of the greenbelt, the rainwater well and the overflow rainwater well are respectively connected with a municipal rainwater pipe, water permeable bricks are laid on the surface of the sidewalk, an impermeable composite geomembrane, a gravel layer. The invention is used for the construction of town roads, residential areas and plant roads, can effectively solve the problems of town waterlogging and unsmooth drainage, and has the characteristics of wide application, strong practicability, firmness, durability, and simple and convenient maintenance.

Description

Rainwater drainage system for green belts and sidewalks of town roads and construction method

Technical Field

The invention relates to the technical field of urban road construction, in particular to a rainwater drainage system for green belts and sidewalks of urban roads and a construction method.

Background

At present, in the urban road construction process, excessive development and disordered construction phenomena occur occasionally, and after a large amount of urban road surface hardening, the original hydrological characteristics of the road are damaged, so that the rainwater absorption, seepage storage and slow release effects of the urban road are reduced. Once the vehicle enters a rainy season, rainwater can not be timely discharged from a sidewalk or a green belt, a large amount of water is accumulated on the road surface, the sidewalk is wet and slippery, pedestrians are unsafe, waterlogging occurs in the green belt, rainwater in the green belt leaks to pollute the road surface, urban waterlogging and urban runoff pollution loads in the rainy season are increased, potential safety hazards are caused to vehicle driving and pedestrian safety, and the phenomenon is not in accordance with the advanced concept of modern sponge city construction.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides a rainwater drainage system for urban road greenbelts and sidewalks and a construction method thereof, which aim to solve the problem of accumulated water and even waterlogging on the road surface formed by unsmooth drainage of urban roads and untimely drainage in heavy rain, reasonably allocate the absorption, seepage storage and slow release capacities of the greenbelts and reduce the potential safety hazard of vehicles and pedestrians going out in rainy days.

In order to realize the purpose, the invention comprises a motor vehicle lane, a green belt, a non-motor vehicle lane and a sidewalk, wherein one side surface of the green belt is connected with the motor vehicle lane through a first vertical kerbstone, the other side surface of the green belt is connected with one side of the non-motor vehicle lane through a second vertical kerbstone, and the other side of the non-motor vehicle lane is connected with the sidewalk through a third vertical kerbstone; the bottom of one side of the motor vehicle lane is provided with a rainwater well I, the bottom of one side of the green belt is provided with an overflow rainwater well, the bottom of one side of the non-motor vehicle lane is provided with a rainwater well II, and the rainwater well I, the overflow rainwater well and the rainwater well II are respectively connected with municipal rainwater pipes; the surface of the green belt is provided with a concave green land and pebble buffer zone, and the surface of the sidewalk is paved with permeable bricks.

Furthermore, the greenbelt is equipped with prevention of seepage compound geomembrane, metalling, the geotechnological cloth that permeates water, planting soil from the bottom to the surface in proper order, and the pipe that permeates water that is located the metalling is connected with overflow rainwater well along greenbelt inside edge, the outside parcel of the pipe that permeates water has the geotechnological cloth that permeates water.

Furthermore, the first vertical kerbs and the second vertical kerbs on two sides of the pebble buffer zone of the green belt are perforated vertical kerbs, and the perforated vertical kerbs are arranged at intervals of 20-50 m along the longitudinal direction of the green belt; the width of the pebble buffer zone is 1000mm, and the thickness of the pebble buffer zone is 160 mm.

Furthermore, the top surface height of the permeable brick of the sidewalk is parallel to the three levels of the vertical kerbs, the lower part of the permeable brick is provided with sand-free macroporous concrete, the lower part of the sand-free macroporous concrete is provided with a gravel layer, a permeable pipe connected with the rainwater well II is arranged in the gravel layer, the outer part of the permeable pipe is wrapped with permeable geotextile, and the bottom of the gravel layer is connected with the foundation through an impermeable composite geomembrane.

Further, one side of the sidewalk is also provided with a tree pit, the tree pit is connected with the water permeable brick through a tree pit curb, the surface of the tree pit is provided with a tree pit grate, and planting soil is arranged at the lower part of the tree pit.

Furthermore, the pipe of permeating water is the PVC pipe of diameter 110mm, and it has the diameter 10-15 mm hole of permeating water to open on it, and hole axial interval 300-500 mm permeates water, along 4-5 equal portions equipartition of circumferencial direction.

Furthermore, the anti-seepage composite geomembrane is an impermeable material formed by compounding a geotextile and a geomembrane, and adopts a two-cloth one-film structure.

Furthermore, the gravel layer is composed of gravel with the diameter of 12.5-27.5 mm; the permeable geotextile is a non-woven geotextile and is formed by needling or weaving synthetic fibers.

Furthermore, the sand-free macroporous concrete is prepared by mixing cement, broken stones or pebbles.

The invention relates to a construction method of a rainwater drainage system for green belts and sidewalks of town roads, which comprises the following steps:

firstly, excavating a road surface, planning the transverse sizes of a motor vehicle lane, a green belt, a non-motor vehicle lane and a sidewalk, and tamping the bottom foundation of the motor vehicle lane, the green belt, the non-motor vehicle lane and the sidewalk;

secondly, paving an anti-seepage composite geomembrane on the green belt and the bottom foundation of the sidewalk; a catch basin I and a catch basin II are respectively arranged on one sides of the motorway and the non-motorway, an overflow catch basin is arranged on one side of the green belt, and the catch basin I, the catch basin II and the overflow catch basin are connected with municipal rainwater pipes;

thirdly, paving a rubble layer on the anti-seepage composite geomembrane, and paving a permeable pipe wrapped with permeable geotextile outside along the inner side edge of the green belt and the inner side edge of the sidewalk in the rubble layer respectively; the water permeable pipe is connected with the overflow catch basin and the catch basin II;

fourthly, paving water permeable geotextile above the gravel layer of the green belt part, and then cultivating planting soil; paving non-sand macroporous concrete above the gravel layer of the sidewalk part, and paving a water permeable brick on the non-sand macroporous concrete;

fifthly, arranging a pebble buffer zone on the green belt every 20-50 m, wherein the width of the pebble buffer zone is 1000mm, and arranging concave green land planting green plants on two sides of the pebble buffer zone; arranging a tree pit on one side of the sidewalk, paving a tree pit grate around the tree pit to be connected with the water permeable bricks, and arranging a tree pit grate on the surface of the tree pit;

sixthly, arranging a first vertical kerb at the junction of the green belt and the motor vehicle lane, arranging a second vertical kerb at the junction of the green belt and the non-motor vehicle lane, and arranging a third vertical kerb at the junction of the non-motor vehicle lane and the sidewalk; wherein, the two sides of the pebble buffer zone positioned on the green belt are provided with perforated vertical kerbs;

and safety well covers are respectively arranged above the rainwater well I, the rainwater well II and the overflow rainwater well.

Compared with the prior art, the invention can effectively relieve urban waterlogging and unsmooth drainage. In rainy seasons, rainwater on the motor vehicle lane and the non-motor vehicle lane is collected to a rainwater well on the roadside and is drained away in time through a municipal rainwater pipe; rainwater on the sidewalk enters the water permeable pipe through the road surface water permeable bricks and the sand-free macroporous concrete and flows into the municipal rainwater pipe through the rainwater well to be drained away; meanwhile, part of rainwater on the road surface can flow into the green belt to be stored (the redundant rainwater can enter a municipal rainwater pipe through a water permeable pipe at the bottom layer of the green belt to be drained). In dry weather, the water stored in the gravel layer in the green belt rises and volatilizes into the soil, and the water shortage condition of the trees and the lawns is relieved. The invention preferentially utilizes a natural drainage system to construct ecological drainage facilities, plays the roles of absorbing, storing, permeating and slowly releasing rainwater in urban greenbelts, roads, water systems and the like, protects the original road hydrological characteristics, effectively relieves urban waterlogging, reduces urban runoff pollution load, saves water resources, protects and improves urban ecological environment, and provides important guarantee for constructing sponge cities with natural accumulation, natural permeation and natural purification functions.

Drawings

Fig. 1 is a schematic diagram of the green belt structure of the present invention.

Fig. 2 is a schematic sectional view taken along line a-a of fig. 1.

Fig. 3 is a schematic sectional view taken along line B-B of fig. 1.

Fig. 4 is a schematic cross-sectional view of C-C of fig. 1.

Fig. 5 is a diagrammatic illustration of the sidewalk structure of the present invention.

Fig. 6 is a schematic cross-sectional view taken along line D-D of fig. 5.

Fig. 7 is a schematic cross-sectional view E-E of fig. 5.

In the figure, 1, a motor vehicle lane, 2, a green belt, 3, a non-motor vehicle lane, 4, a sidewalk, 5, a first vertical kerbstone, 6, a second vertical kerbstone, 7, a third vertical kerbstone, 8, a perforated vertical kerbstone, 9, a first rainwater well, 10, an overflow rainwater well, 11, a second rainwater well, 12, a municipal rainwater pipe, 13, a concave greenbelt, 14, a pebble buffer zone, 15, a water permeable pipe, 16, an impermeable composite geomembrane, 17, a gravel layer, 18, a permeable cloth, 19, planting soil, 20, a water permeable brick, 21, non-sand large-hole concrete, 22, a tree pit, 23, a tree pit seed, 24 and a tree pit kerbstone.

Detailed Description

The present invention will be further described with reference to the following embodiments.

As shown in fig. 1, 2, 3, 4, 5, 6 and 7, the invention comprises a motor vehicle lane 1, a green belt 2, a non-motor vehicle lane 3 and a sidewalk 4, wherein one side surface of the green belt 2 is connected with the motor vehicle lane 1 through a first vertical kerbstone 5, the other side surface is connected with one side of the non-motor vehicle lane 3 through a second vertical kerbstone 6, and the other side of the non-motor vehicle lane 3 is connected with the sidewalk 4 through a third vertical kerbstone 7; the bottom of one side of the motorway 1 is provided with a catch basin I9, the bottom of one side of the green belt 2 is provided with an overflow catch basin 10, the bottom of one side of the non-motorway 3 is provided with a catch basin II 11, and the catch basin I9, the overflow catch basin 10 and the catch basin II 11 are respectively connected with a municipal rainwater pipe 12; the height of the well mouths of the rainwater well I9 and the rainwater well II 11 is slightly lower than the height of the road surface, so that the smooth flow rate of rainwater is ensured; the surface of the green belt 2 is provided with a concave green land 13 and a pebble buffer zone 14, and the surface of the sidewalk 4 is paved with permeable bricks 20. The water permeable brick is formed by pressing common macadam and porous concrete materials, the brick body is fully provided with water permeable holes, the water permeability is good, rainwater can flow to the underground from the micro holes in the brick body, and the compression resistance, the bending resistance and the water permeability speed of the water permeable brick can meet the requirements of urban pavements. The specification of the water permeable brick is 200 multiplied by 100 multiplied by 60mm, the compressive strength is C30 (C30 represents that the compressive strength of a standard cubic test block of concrete is at least 30MP and not more than 35 MP), and the water permeability coefficient is not less than 0.01 cm/s (representing the water permeability of the water permeable brick).

The greenbelt 2 is equipped with compound geomembrane 16 of prevention of seepage, metalling 17, the geotechnological cloth 18 of permeating water, planting soil 19 from the bottom to the surface in proper order, and the pipe 15 of permeating water that is located the metalling 17 collects the unnecessary rainwater that permeates down from planting soil 19 to be connected with overflow rainwater well 10 along the inboard edge of greenbelt 2, the outside parcel of the pipe 15 of permeating water has the geotechnological cloth 18 of permeating water, filters the rainwater that gets into the pipe 15 of permeating water, avoids dregs entering the pipe 15 of permeating water to block up the pipeline.

The first vertical kerbs 5 and the second vertical kerbs 6 on two sides of the pebble buffer zone 14 of the green belt 2 are perforated vertical kerbs 8, and the perforated vertical kerbs 8 are arranged at intervals of 20-50 m along the longitudinal direction of the green belt 2; the width of the pebble buffer zone 14 is 1000mm, the thickness of the pebble buffer zone is 160mm, and the height of the pebble buffer zone 14 is slightly higher than that of the concave green lands 13 at the two sides. The redundant rainwater of the motor vehicle lane 1 and the non-motor vehicle lane 3 enters the pebble buffer zone 14 through the open hole vertical kerbs 8 and flows to the concave greenbelts 13 at two sides to share the water volume directly flowing to the rainwater well I9 and the rainwater well II 11, so that the motor vehicle lane 1 and the non-motor vehicle lane 3 are ensured to have no redundant accumulated water.

The top surface of the permeable brick 20 of the sidewalk 4 is level with the third vertical kerb 7, so that when rainwater is concentrated too much, the rainwater of the non-motor vehicle lane 3 cannot submerge the sidewalk 4, the lower part of the permeable brick 20 is provided with the sand-free macroporous concrete 21, the lower part of the sand-free macroporous concrete 21 is provided with the gravel layer 17, and the sand-free macroporous concrete 21 and the gravel layer 17 can enhance the hardness of the sidewalk 4. A permeable pipe 15 connected with the rainwater well II 11 is arranged in the gravel layer 17, a permeable geotextile 18 is wrapped outside the permeable pipe 15, and the bottom of the gravel layer 17 is connected with the foundation through an impermeable composite geomembrane 16.

The sidewalk 4 is provided with a tree pit 22 on one side surface, the tree pit 22 is connected with a water permeable brick 20 through a tree pit rimstone 24, a tree pit grate 23 and a tree pit rimstone 24 are arranged on the surface of the tree pit 22, the tree pit grate 23 ensures that the root of the tree absorbs air and grows healthily, and planting soil 19 is arranged below the tree pit 22. The positions of the tree holes 22 where the trees are planted are not provided with the gravel layers, so that the growth nutrition of the trees is more facilitated.

The pipe 15 of permeating water is the PVC pipe of diameter 110mm, and it has the diameter 10-15 mm hole of permeating water to open on it, and hole axial separation 300-500 mm permeates water, along 4-5 equal portions equipartitions of circumferencial direction.

The impermeable composite geomembrane 16 is an impermeable material formed by compositing geotextiles and geomembranes, adopts a two-cloth one-film structure, ensures that the geomembrane is laid on a foundation without sliding, prevents rainwater from permeating the foundation by using a plastic film in the middle, and reasonably allocates water resources.

The gravel layer 17 consists of gravel with the diameter of 12.5-27.5 mm; the water-permeable geotextile 18 is a non-woven geotextile and is formed by needling or weaving synthetic fibers.

The sand-free macroporous concrete 21 is prepared by mixing cement, broken stones or pebbles, has the strength of C20 (C20 represents that the compressive strength of a standard cubic test block of the concrete is at least 20MP and not more than 25 MP), and the diameter of the broken stones is 10-20 mm.

firstly, excavating a road surface, planning the transverse dimensions of a motor vehicle lane 1, a green belt 2, a non-motor vehicle lane 3 and a sidewalk 4, and tamping the bottom foundation of the motor vehicle lane 1, the green belt 2, the non-motor vehicle lane 3 and the sidewalk 4;

secondly, paving an anti-seepage composite geomembrane 16 on the bottom foundation of the green belt 2 and the sidewalk 4; a rainwater well I9 and a rainwater well II 11 are respectively arranged on one side of the motorway 1 and one side of the non-motorway 3, an overflow rainwater well 10 is arranged on one side of the green belt 2, and the rainwater well I9, the rainwater well II 11 and the overflow rainwater well 10 are connected with a municipal rainwater pipe 12;

thirdly, paving a gravel layer 17 on the anti-seepage composite geomembrane 16, and paving a water-permeable pipe 15 wrapped with water-permeable geotextile 18 on the outer side of the gravel layer 17 along the inner side edge of the green belt 2 and the inner side edge of the sidewalk 4 respectively; the water permeable pipe 15 is connected with the overflow catch basin 10 and the catch basin II 11;

fourthly, paving water permeable geotextile 18 above the gravel layer 17 of the green belt 2 part, and then cultivating planting soil 19; paving non-sand macroporous concrete 21 above the gravel layer 17 of the sidewalk 4 part, and paving a water permeable brick 20 on the non-sand macroporous concrete 21;

fifthly, arranging a pebble buffer zone 14 on the green belt 2 every 20-50 m, wherein the width of the pebble buffer zone 14 is 1000mm, and arranging concave green lands 13 on two sides of the pebble buffer zone 14 for planting green plants; arranging a tree pit 22 on one side of the sidewalk 4, paving a tree pit grate 23 around the tree pit 22 to be connected with the water permeable brick 20, and arranging the tree pit grate 23 on the surface of the tree pit 22;

sixthly, arranging a first vertical kerb 5 at the junction of the green belt 2 and the motor vehicle lane 1, arranging a second vertical kerb 6 at the junction of the green belt 2 and the non-motor vehicle lane 3, and arranging a third vertical kerb 7 at the junction of the non-motor vehicle lane 3 and the sidewalk 4; wherein, two sides of the pebble buffer zone 14 positioned on the green belt 2 are provided with perforated vertical curbs 8;

and safety well covers are respectively arranged above the rainwater well I9, the rainwater well II 11 and the overflow rainwater well 10.

When the rain water drainage system is used in rainy seasons in cities, most of rain water on the motor vehicle lane 1 and the non-motor vehicle lane 3 is collected into a rainwater well I9 and a rainwater well II 11 on the roadside through a first vertical kerbstone 5 and a third vertical kerbstone 7 respectively and is drained in time through a municipal rainwater pipe 12, and a small part of the rain water of the motor vehicle lane 1 and the non-motor vehicle lane 3 enters the green belt 2 through the perforated vertical kerbstone 8 and the pebble buffer belt 14, so that the motor vehicle lane 1 and the non-motor vehicle lane 3 are ensured not to be retained by redundant rain water. Rainwater on the sidewalk 4 enters the water permeable pipe 15 through the road surface water permeable brick 20, the sand-free macroporous concrete 21 and the gravel layer 17 and enters the municipal rainwater pipe 12 through the rainwater well II 11 to be discharged; the redundant rainwater in the tree pit 22 on one side of the sidewalk 4 penetrates through the planting soil 19 on the lower part of the tree pit and enters the rainwater well II 11 through the water permeable pipe 15 to be discharged, and the condition that no accumulated water is left on the sidewalk 3 is guaranteed. Redundant rainwater in the green belt 2 penetrates through the planting soil 19, the permeable geotextile 18 and the rubble layer 16 to enter the permeable pipe 15 and is connected with the municipal rainwater pipe 12 through the overflow rainwater well 10 to be discharged, and the impermeable composite geomembrane 16 at the bottom of the rubble layer 17 ensures that the rainwater cannot penetrate into the foundation of the ground bottom layer. In rainy days, rainwater remained in the gravel layer 17 can rise and volatilize into the planting soil 19, the water shortage condition of trees and lawns in the green belt 2 is relieved, the use functions of the green belt and sidewalks are improved, and the concept of sponge city construction is implemented. The invention can be widely applied to the construction of urban roads, residential areas and roads in factories, effectively solves urban waterlogging and unsmooth drainage, provides a safe, convenient and clean environment for vehicles and pedestrians to go out in rainy days, and has the characteristics of wide application, strong practicability, firmness, durability, simple and convenient maintenance and the like.

Claims

1. A rainwater drainage system for green belts and sidewalks of town roads is characterized by comprising a motor vehicle lane (1), a green belt (2), a non-motor vehicle lane (3) and a sidewalk (4), wherein the surface of one side of the green belt (2) is connected with the motor vehicle lane (1) through a first vertical kerbstone (5), the surface of the other side of the green belt is connected with one side of the non-motor vehicle lane (3) through a second vertical kerbstone (6), and the other side of the non-motor vehicle lane (3) is connected with the sidewalk (4) through a third vertical kerbstone (7); a rainwater well I (9) is arranged at the bottom of one side of the motor way (1), an overflow rainwater well II (11) is arranged at the bottom of one side of the green belt (2), and the rainwater well I (9), the overflow rainwater well II (10) and the rainwater well II (11) are respectively connected with a municipal rainwater pipe (12); the surface of the green belt (2) is provided with a concave green land (13) and a pebble buffer zone (14), and the surface of the sidewalk (4) is paved with permeable bricks (20).

2. A town road green belt, sidewalk rainwater drainage system according to claim 1, characterized in that the green belt (2) is provided with an anti-seepage composite geomembrane (16), a gravel layer (17), a permeable geotextile (18) and planting soil (19) in sequence from bottom to surface, a permeable pipe (15) positioned on the gravel layer (17) is connected with the overflow rainwater well (10) along the inner side edge of the green belt (2), and the permeable pipe (15) is wrapped with the permeable geotextile (18).

3. A rainwater drainage system for a town road green belt and a sidewalk according to claim 2, characterized in that the first vertical kerbstone (5) and the second vertical kerbstone (6) at two sides of the pebble buffer zone (14) of the green belt (2) are perforated vertical kerbstones (8), and the perforated vertical kerbstones (8) are arranged at intervals of 20-50 m along the longitudinal direction of the green belt (2); the width of the pebble buffer zone (14) is 1000mm, and the thickness is 160 mm.

4. A town road green belt, sidewalk rainwater drainage system according to claim 1, wherein the top surface of the water permeable brick (20) of the sidewalk (4) is level with the third vertical kerb (7), the sand-free macroporous concrete (21) is arranged at the lower part of the water permeable brick (20), the gravel layer (17) is arranged at the lower part of the sand-free macroporous concrete (21), the water permeable pipe (15) connected with the second rainwater well (11) is arranged in the gravel layer (17), the water permeable geotextile (18) is wrapped at the outer part of the water permeable pipe (15), and the bottom of the gravel layer (17) is connected with the foundation through the impermeable composite geomembrane (16).

5. A town road green belt, sidewalk rainwater drainage system according to claim 4, characterized in that one side of the sidewalk (4) is further provided with a tree pit (22), the tree pit (22) is connected with the water permeable brick (20) through a tree pit curb (24), the surface of the tree pit (22) is provided with a tree pit grate (23), and the lower part of the tree pit (22) is planting soil (19).

6. A rainwater drainage system for town road green belts and sidewalks according to claims 2 and 4, wherein the water permeable pipe (15) is a PVC pipe with a diameter of 110mm, and is provided with water permeable holes with a diameter of 10-15 mm, and the axial distance between the water permeable holes is 300-500 mm, and the water permeable holes are uniformly distributed in equal parts along the circumferential direction of 4-5 mm.

7. The rainwater drainage system for town road green belts and sidewalks according to claims 2 and 4, wherein the seepage-proofing composite geomembrane (16) is a waterproof material compounded by geotextile and geomembrane, and adopts a two-cloth one-film structure.

8. A rainwater drainage system for town road green belts and sidewalks according to claims 2 and 4, characterized in that the gravel layer (17) is composed of gravel with a diameter of 12.5-27.5 mm; the water-permeable geotextile (18) is a non-woven geotextile and is formed by needling or weaving synthetic fibers.

9. A rainwater drainage system for town road green belts and sidewalks according to claim 4, characterized in that said non-sand large-hole concrete (21) is made of cement, crushed stone or pebble mixed.

10. A construction method of a rainwater drainage system for green belts and sidewalks of town roads is characterized by comprising the following steps:

firstly, excavating a road surface, planning the transverse dimensions of a motor vehicle lane (1), a green belt (2), a non-motor vehicle lane (3) and a sidewalk (4), and tamping the bottom foundation of the motor vehicle lane (1), the green belt (2), the non-motor vehicle lane (3) and the sidewalk (4);

secondly, paving an anti-seepage composite geomembrane (16) on the green belt (2) and the bottom foundation of the sidewalk (4); a rainwater well I (9) and a rainwater well II (11) are respectively arranged on one side of the motor vehicle lane (1) and one side of the non-motor vehicle lane (3), an overflow rainwater well (10) is arranged on one side of the green belt (2), and the rainwater well I (9), the rainwater well II (11) and the overflow rainwater well (10) are connected with a municipal rainwater pipe (12);

thirdly, a gravel layer (17) is laid on the anti-seepage composite geomembrane (16), and water permeable pipes (15) wrapped with water permeable geotextiles (18) are respectively laid in the gravel layer (17) along the inner side edge of the green belt (2) and the inner side edge of the sidewalk (4); the water permeable pipe (15) is connected with the overflow catch basin (10) and the catch basin II (11);

fourthly, paving water permeable geotextile (18) above the gravel layer (17) of the green belt (2), and then cultivating planting soil (19); paving non-sand macroporous concrete (21) above the gravel layer (17) of the sidewalk (4), and paving a water permeable brick (20) on the non-sand macroporous concrete (21);

fifthly, arranging pebble buffer zones (14) on the green belt (2) every 20-50 m, wherein the width of each pebble buffer zone (14) is 1000mm, and planting green plants in concave green lands (13) arranged on two sides of each pebble buffer zone (14); a tree pit (22) is arranged on one side of the sidewalk (4), a tree pit grate (23) is laid around the tree pit (22) and connected with the water permeable brick (20), and the tree pit grate (23) is arranged on the surface of the tree pit (22);

sixthly, arranging a first vertical kerbstone (5) at the junction of the green belt (2) and the motor vehicle lane (1), arranging a second vertical kerbstone (6) at the junction of the green belt (2) and the non-motor vehicle lane (3), and arranging a third vertical kerbstone (7) at the junction of the non-motor vehicle lane (3) and the sidewalk (4); wherein, the two sides of the pebble buffer zone (14) positioned on the green belt (2) are provided with perforated vertical kerbs (8);

and safety well covers are respectively arranged above the rainwater well I (9), the rainwater well II (11) and the overflow rainwater well (10).