Old community reconstruction method based on sponge city construction

Abstract

The invention relates to the technical field of city reconstruction, and discloses an old community reconstruction method based on sponge city construction, which comprises the following steps: determining reconstruction areas based on rainwater engineering and foundation buildings of old communities, the reconstruction areas being an outer wall area, a road area and a green area; based on the transformation measures, the outer wall area is transformed, and rainwater disconnection nodes are obtained; based on the transformation measures, the road and the greening area are transformed, and rainwater garden nodes are obtained; a sponge module-old community composite residential system is obtained; according to the old community reconstruction method based on sponge city construction, old community construction and sponge module fusion reconstruction are carried out, a reasonable reconstruction sequence is provided, a sponge module-old community composite residential system is obtained, management and reutilization of rainwater resources are achieved to the maximum extent, and the utilization rate of the rainwater resources is improved. And surface runoff and rainwater pollution are reduced, the rainwater waterlogging phenomenon is remarkably reduced, and the living comfort of residents is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of urban reconstruction, and in particular to a method for reconstructing old residential areas based on sponge city construction. Background Art

[0002] The renovation of old residential communities refers to a series of renovation activities carried out on residential communities in cities that were built earlier, have backward public facilities, and affect the basic lives of residents.

[0003] In the related technologies, the outdoor venues of old communities often have problems with aging or unreasonable design of the drainage system, which makes it easy for the outdoor venues of old communities to accumulate water or even form waterlogging, and also causes damage to some road slabs, causing great inconvenience to residents' travel. In addition, rainwater is often mixed with other surface pollutants such as sewage, which affects the overall environment of the community and causes a waste of rainwater resources. Summary of the invention

[0004] In view of this, the present invention provides a method for renovating old communities based on sponge city construction to solve the problem that outdoor areas of old communities are prone to waterlogging, causing damage to road slabs, affecting residents' travel, and pollutants mixed in rainwater, affecting the community environment and causing waste of rainwater resources.

[0005] The present invention provides a method for renovating old residential areas based on sponge city construction, comprising: S1: obtaining the annual runoff volume control rate and the non-point source pollution reduction rate of the old residential area; S2: determining the technical measures for renovating the old residential area based on the annual runoff volume control rate and the non-point source pollution reduction rate, as well as the rainwater engineering of the old residential area; for the source of the rainwater engineering of the old residential area, the renovation measures are permeable pavement and rainwater garden structure; for the transmission of the rainwater engineering of the old residential area, the renovation measures are grass-planted ditches; for the end of the rainwater engineering of the old residential area, the renovation measures are rainwater storage tanks; S3: based on the old residential area The rainwater projects and basic buildings in the district are used to determine the renovation areas of the old residential areas, and the renovation areas are the outer wall areas, roads and green areas; S4: based on the renovation measures, the outer wall areas are renovated to obtain rainwater disconnection nodes, and the rainwater disconnection nodes are suitable for cutting off the flow of rainwater on the surface; S5: based on the renovation measures, the roads and green areas are renovated to obtain rainwater garden nodes, and the rainwater garden nodes are suitable for collecting, purifying and reusing rainwater; S6: monitoring systems are set at the rainwater disconnection nodes and the rainwater garden nodes to obtain a composite residential system of sponge modules and old residential areas.

[0006] In an optional embodiment, in step S4, the rainwater disconnect node is set on the outer wall and the first soil layer located beside the outer wall; the rainwater disconnect node includes: a downpipe, which is extended along the height direction and is set on the outer wall, and the downpipe is bent at one end of the pipe body close to the first soil layer to form a water outlet section; a permeable layer, which is laid on a part of the first soil layer, and the permeable layer is set corresponding to the outlet of the water outlet section, so that the rainwater discharged from the outlet infiltrates through the permeable layer to cut off the flow of rainwater on the surface.

[0007] In an optional embodiment, in step S5, the rain garden node is arranged on the road and at the second soil layer located beside the road; the rain garden node includes: a rainwater pool, arranged at the second soil layer; a purification layer is provided in the rainwater pool, and the purification layer is suitable for purifying rainwater; the rainwater pool is connected to the regulating tank by a drainage pipe to discharge the purified rainwater into the regulating tank; curbs are provided on both side edges of the road along the width direction, and water holes are penetrated through the curbs; the second soil layer is formed with an inclined guide surface in the soil section between the road and the rainwater pool, and the inclined guide surface is arranged downwardly inclined in the direction close to the rainwater pool; a grass-planted ditch is arranged at the inclined guide surface and extends along the inclined direction of the inclined guide surface, suitable for diverting rainwater into the rainwater pool.

[0008] In an optional embodiment, the rainwater pool includes: a pit, which is concavely formed at the second soil layer, and the purification layer is laid on the bottom of the pit; an overflow well, which is arranged inside the pit, and the overflow port of the overflow well is arranged higher than the purification layer in the height direction, so that rainwater is retained in the pit for sufficient purification; a water diversion pipe, which is extended and bent and arranged in the pit, one end of the water diversion pipe is connected to the overflow well, and the other end is provided with a water diversion port, and the water diversion port is arranged higher than the overflow port in the height direction; wherein the rainwater pool stores rainwater, and when the water level reaches the second water level, the rainwater enters the overflow well through the overflow port, and when the water level reaches the first water level, the rainwater flows into the overflow well through the water diversion port; wherein the first water level is arranged higher than the second water level in the height direction, and the first water level is suitable for being arranged flush with the pit mouth of the pit.

[0009] In an optional embodiment, one end of the drainage pipe is connected to the bottom of the overflow well, and the other end is connected to the regulating reservoir.

[0010] In an optional implementation, in step S5, the road surface of the road is paved with permeable concrete and permeable asphalt.

[0011] In an optional implementation, in step S5, the interval distance between the outer wall of the rainwater pool is D, where D>3m.

[0012] In an optional embodiment, the permeable layer includes a basic permeable layer and a first loose permeable layer; the basic permeable layer is laid on the first soil layer, the first loose permeable layer includes side plates and first permeable particles, a plurality of the side plates are fixed at the basic permeable layer, and the first permeable particles are accumulated between the plurality of the side plates.

[0013] In an optional embodiment, the curbstone is fixed to the side of the road by means of a sleeve, a second loose permeable layer is provided between the sleeve and the first soil layer, and the second loose permeable layer is formed by accumulation of second permeable particles.

[0014] In an optional embodiment, the first water-permeable particles and the second water-permeable particles are both pebbles.

[0015] Beneficial effects: By integrating the construction of old communities with the sponge module and providing a rational transformation sequence, a composite residential system of sponge modules and old communities is obtained, which maximizes the management and reuse of rainwater resources, reduces surface runoff and rainwater pollution, and significantly reduces the occurrence of rainwater waterlogging, thereby improving the living comfort of residents. Specifically, through source transformation measures such as permeable pavement and rainwater gardens, as well as the transmission transformation of grass-planted ditches and the terminal treatment of rainwater storage tanks, rainwater surface runoff is effectively reduced, the occurrence of rainwater waterlogging is significantly reduced, and the efficiency of rainwater resource management and reuse is improved. Focusing on the transformation of building drainage areas and road drainage areas, the phenomenon of rainwater waterlogging and road slab damage is effectively improved, and the quality of infrastructure in old communities is improved.

[0016] Beneficial effects: By bending the outlet section of the downpipe and setting a permeable layer, rainwater discharged from the outlet can fall directly to the permeable layer and infiltrate through the permeable layer, effectively cutting off the surface runoff of rainwater, reducing the accumulation and flow of rainwater on the surface, and thus reducing the risk of rainwater waterlogging; the laying of the permeable layer increases the soil's permeability to rainwater, allowing rainwater to be absorbed and utilized by the soil more quickly, helping to replenish groundwater, improve soil moisture, and promote vegetation growth; the setting of rainwater disconnection nodes simplifies the structure of the exterior wall drainage system, reduces the number of drainage pipes and drainage wells, reduces construction costs and maintenance difficulties, and improves the reliability and stability of the drainage system.

[0017] Beneficial effects: By setting up a rainwater pool beside the road and a grass-planted ditch between the road and the rainwater pool, rainwater can flow smoothly into the rainwater pool, thereby enhancing the road drainage capacity, reducing the problem of water accumulation on the road, and preventing rainwater from damaging road slabs; rainwater is naturally purified by the rainwater pool, effectively removing pollutants in the rainwater, and the purified rainwater is discharged into the regulating storage pool, realizing the resource utilization of rainwater, which can be used for road washing, greening watering and landscape water replenishment, reducing the burden on the urban drainage system and reducing water resource consumption; an overflow well and a water distribution pipe are provided in the rainwater pool, and by setting different water levels, namely the first water level and the second water level, effective management of rainwater during heavy rain periods and normal periods is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of the old residential area reconstruction method based on sponge city construction of the present invention;

[0020] Figure 2 is a schematic diagram of a rainwater disconnect node of the present invention;

[0021] Figure 3 It is a schematic diagram of a rain garden node of the present invention.

[0022] Description of reference numerals:

[0023] 1. Rainwater disconnect node; 11. Rainwater downpipe; 12. Water outlet; 121. Water outlet; 13. Permeable layer; 14. Foundation permeable layer; 15. First loose permeable layer; 16. Side plate; 2. Rainwater garden node; 21. Rainwater pool; 22. Purification layer; 23. Drain pipe; 24. Pit; 25. Overflow well; 251. Overflow outlet; 26. Water distribution pipe; 261. Water distribution outlet; 27. First water level; 28. Second water level; 3. External wall; 31. First soil layer; 4. Road; 41. Second soil layer; 42. Curb stone; 43. Water hole; 44. Inclined guide surface; 45. Grass ditch; 46. Pad; 47. Second loose permeable layer. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0025] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0028] Combine the following Figures 1 to 3 , describing an embodiment of the present invention.

[0029] According to an embodiment of the present invention, a method for renovating an old residential area based on sponge city construction is provided, comprising: S1: obtaining an annual runoff volume control rate and a non-point source pollution reduction rate of the old residential area; S2: determining technical measures for renovating the old residential area based on the annual runoff volume control rate and the non-point source pollution reduction rate, as well as the rainwater project of the old residential area; for the source of the rainwater project of the old residential area, the renovation measures are a permeable pavement layer and a rainwater garden structure; for the transmission of the rainwater project of the old residential area, the renovation measures are a grass-planted ditch 45 channel; for the end of the rainwater project of the old residential area, the renovation measures are a rainwater storage tank; S3: based on the old residential area The rainwater engineering and basic buildings of the community determine the renovation area of ​​the old community, and the renovation area is the outer wall area, road and green area; S4: based on the renovation measures, the outer wall area is renovated to obtain a rainwater disconnection node 1, and the rainwater disconnection node 1 is suitable for cutting off the flow of rainwater on the surface; S5: based on the renovation measures, the road and green area are renovated to obtain a rainwater garden node 2, and the rainwater garden node 2 is suitable for collecting, purifying and reusing rainwater; S6: a monitoring system is set at the rainwater disconnection node 1 and the rainwater garden node 2 to obtain a sponge module-old community composite residential system.

[0030] Specifically, due to the defects of rainwater waterlogging, damaged road slabs, and sewage formed after rainwater is contaminated with dirt and affects the environment in the building areas in the old residential areas, this embodiment proposes a renovation method for the above-mentioned old residential areas based on the management method of sponge city; sponge city is an urban rainwater management plan, which means that the city can be like a sponge, with good flexibility in adapting to environmental changes and responding to natural disasters, etc., absorbing water, storing water, infiltrating water, and purifying water when it rains, and releasing and utilizing the stored water when needed; the specific renovation method is to first obtain the rainwater and rainfall control indicators and pollutant emission control indicators of the old residential areas within a unit year, and use the above indicators as the benchmark indicators for renovation. Standard: The rainwater and rainfall control index can be the annual runoff control rate. The annual runoff control rate refers to the proportion of the accumulated rainfall controlled in the site throughout the year to the total annual rainfall through natural and artificial enhanced infiltration, storage, utilization, evaporation, transpiration, etc.; the pollutant emission control index can be the non-point source pollution reduction rate. The non-point source pollution reduction rate refers to the rate at which low-impact development facilities intercept and capture pollutants. Non-point source pollution is mainly composed of soil sediment particles, nutrients such as nitrogen and phosphorus, pesticides, various atmospheric particulate matter, etc., which enter the water, soil or atmospheric environment through surface runoff, soil erosion, etc. The non-point source pollution reduction rate is usually used to evaluate the effectiveness of a measure or project in reducing non-point source pollution.

[0031] Furthermore, based on the annual runoff volume control rate and non-point source pollution reduction rate, combined with the current base conditions of old residential areas, that is, the infrastructure and supporting rainwater projects in old residential areas, the technical measures used for subsequent urban transformation are determined. The technical measures can be determined according to the classification treatment strategy. Among them, at the source of the rainwater project in the old residential area, the transformation measures can choose the technical strategies of permeable pavement, rainwater garden, sunken green space and bioretention zone. The bioretention zone can utilize the synergistic effect of plants, soil and microbial systems to effectively reduce the pollution in rainwater runoff through the processes of storage, infiltration and purification. Pollutant content; at the transmission point of the rainwater project in the old community, the renovation measure can be selected as a grass-planted ditch 45 channel. The grass-planted ditch 45 channel refers to a surface ditch planted with vegetation, which can collect and transport runoff rainwater; at the end of the rainwater project in the old community, the renovation measure can be selected as a rainwater storage tank. The rainwater storage tank can store rainwater during the peak period of rainwater runoff and discharge it outward after the runoff volume decreases. The discharged rainwater can be used for road 4 flushing, greening watering and landscape water body replenishment, playing the role of rainwater scheduling; after the renovation measures are determined, the renovation area of ​​the old community is determined to be the building drainage area and the road 4 The drainage area, namely the outer wall area, the road and green area, the building drainage area and the road 4 drainage area are two key drainage sides of the old community. This area is renovated to improve the rainwater waterlogging phenomenon to the greatest extent and improve the drainage of the community. Then, after clarifying the renovation goals, renovation measures, and renovation areas, the urban construction of the old community can be renovated, and rainwater disconnection node 1 and rainwater garden node 2 are obtained in the two areas respectively. Rainwater disconnection node 1 can cut off the surface runoff of rainwater, thereby preventing rainwater from causing waterlogging. Rainwater garden node 2 can gather rainwater from road 4. Water is collected, purified and reused to prevent rainwater waterlogging from causing damage to the four road slabs; after the renovation is completed, monitoring systems for sponge facilities are established at the two renovation nodes, and regular inspections and maintenance are carried out to ensure the use effect of the sponge module; in this embodiment, by integrating the construction of old residential areas with sponge modules and providing a reasonable renovation sequence, a composite residential system of sponge modules and old residential areas is obtained, which maximizes the management and reuse of rainwater resources, reduces surface runoff and rainwater pollution, reduces the occurrence of rainwater waterlogging, and improves the living comfort of residents.

[0032] Specifically, in the reconstruction plan of the drainage area of ​​the outer wall 3, the rainwater disconnect node 1 is set on the outer wall 3 and the first soil layer 31 located next to the outer wall 3; the rainwater disconnect node 1 includes a downpipe 11, which is extended in the height direction and is set on the outer wall 3, and is bent at one end of the pipe body close to the first soil layer 31 to form a water outlet section 12, and the end of the water outlet section 12 has a water outlet 121; a permeable layer 13 is laid on a part of the first soil layer 31, and the permeable layer 13 is set corresponding to the water outlet 121 of the water outlet section 12, so that the rainwater discharged from the water outlet 121 directly falls to the permeable layer 13, and infiltrates through the permeable layer 13 to cut off the surface runoff of rainwater, thereby preventing rainwater from causing waterlogging.

[0033] Specifically, in the reconstruction plan of the drainage area of ​​road 4, the rain garden node 2 is arranged on road 4 and at the second soil layer 41 located beside the road 4; the rain garden node 2 includes a rainwater pool 21, and the rainwater pool 21 is arranged at the second soil layer 41; a purification layer 22 is provided in the rainwater pool 21, and the purification layer 22 is suitable for purifying rainwater. The purification layer 22 can be sand and plants, so that pollutants in the rainwater are precipitated to the bottom of the rainwater pool 21, and the rainwater is purified with the help of the ecological effects of sand and plants; the rainwater pool 21 is connected to the regulating reservoir by a drainage pipe 23 to discharge the purified rainwater into the regulating reservoir, and the regulating reservoir can temporarily store the purified rainwater and discharge it for road 4 flushing, greening watering and landscape water replenishment.

[0034] Furthermore, curb stones 42 are provided on both side edges of the road 4 in the width direction, and water holes 43 are penetrated through the curb stones 42, so that rainwater on the road 4 can flow into the rainwater pool 21 through the water holes 43; the second soil layer 41 is formed with an inclined guide surface 44 in the soil section between the road 4 and the rainwater pool 21, and the inclined guide surface 44 is inclined downward in the direction close to the rainwater pool 21, and a grass-planted ditch 45 is provided on the inclined guide surface 44, and the grass-planted ditch 45 includes a ditch and plants arranged near the ditch, and the ditch extends along the inclined direction of the inclined guide surface 44, so as to divert rainwater into the rainwater pool 21.

[0035] In addition, the structure of the rainwater pool 21 includes a pit 24, which is concavely formed at the second soil layer 41, and the purification layer 22 is laid on the bottom of the pit 24; an overflow well 25, which is arranged inside the pit 24, and the overflow port 251 of the overflow well 25 is arranged higher than the purification layer 22 in the height direction, so that rainwater is retained in the pit 24 to be fully purified; a water diversion pipe 26, which is extended and bent in the pit 24, and one end of the water diversion pipe 26 is communicated with the bottom of the overflow well 25, and then the pipe body extends and bends in the purification layer 22 to pass through the purification layer 22, and the top of the passed pipe body is provided with a water diversion port 261, and the water diversion port 261 is arranged higher than the overflow port 251 in the height direction; wherein, the rainwater pool 21 stores rainwater, and the water level is When the second water level 28 is reached, the rainwater enters the overflow well 25 through the overflow port 251. The second water level 28 is the normal rainwater level. When the water level reaches the first water level 27, the rainwater flows into the overflow well 25 through the diversion port 261. The first water level 27 is the rainwater level during the rainstorm period. The first water level 27 is higher than the second water level 28 in the height direction, and the first water level 27 is flush with the pit mouth and the diversion port 261 of the pit 24. The second water level 28 is flush with the overflow port 251. The first water level 27 is used to ensure that the transfer of rainwater in the rainwater pool 21 is accelerated during the rainstorm period to prevent rainwater from overflowing the pit 24, thereby preventing rainwater from flooding in the community. The second water level 28 is used to allow the rainwater that has been purified to a certain extent to flow into the overflow well and enter the regulating pool through the overflow well.

[0036] Optionally, in the initial use stage of the sponge module-old community complex residential system, the height of the overflow port 251 can be lowered accordingly according to the water storage depth of the rainwater garden, thereby reducing the retention time of rainwater in the rainwater pool 21, improving the survival rate of plants, and ensuring the purification effect. After the plants have passed the growth cycle, the original height of the overflow port 251 can be restored to improve the effect of the rainwater garden node 2.

[0037] The present embodiment provides a method for renovating old residential communities based on sponge city construction. By integrating the construction of old residential communities with sponge modules and providing a reasonable renovation sequence, a composite residential system of sponge modules and old residential communities is obtained, which maximizes the management and reuse of rainwater resources, reduces surface runoff and rainwater pollution, and significantly reduces the occurrence of rainwater waterlogging, thereby improving the living comfort of residents. Specifically, through source renovation measures such as permeable pavement and rainwater gardens, as well as transmission renovation of grass-planted ditches 45 and terminal treatment of rainwater storage tanks, rainwater surface runoff is effectively reduced, the occurrence of rainwater waterlogging is significantly reduced, and the efficiency of rainwater resource management and reuse is improved. Focusing on the renovation of building drainage areas and road 4 drainage areas, the phenomenon of rainwater waterlogging and the problem of road 4 slab damage are effectively improved, and the quality of infrastructure in old residential communities is improved.

[0038] The present embodiment provides a modification of the rainwater disconnect node 1 at the drainage area of ​​the outer wall 3. The outlet section 12 of the rainwater downpipe 11 is bent and arranged, and a permeable layer 13 is arranged, so that the rainwater discharged from the outlet 121 can directly fall to the permeable layer 13 and infiltrate through the permeable layer 13, effectively cutting off the surface runoff of rainwater, reducing the accumulation and flow of rainwater on the surface, and thus reducing the risk of rainwater waterlogging; the laying of the permeable layer 13 increases the soil's permeability to rainwater, so that rainwater can be absorbed and utilized by the soil more quickly, which helps to replenish groundwater, improve soil moisture, and promote vegetation growth; the setting of the rainwater disconnect node 1 simplifies the structure of the drainage system of the outer wall 3, reduces the number of drainage pipes 23 and drainage wells, reduces construction costs and maintenance difficulties, and improves the reliability and stability of the drainage system.

[0039] The present embodiment provides a modification of a rain garden node 2 at a drainage area of ​​a road 4. By setting a rainwater pool 21 beside the road 4 and a grass-planted ditch 45 between the road 4 and the rainwater pool 21, rainwater can flow smoothly into the rainwater pool 21, thereby enhancing the drainage capacity of the road 4, reducing water accumulation on the road 4, and preventing rainwater from damaging the road 4 slabs; the rainwater is naturally purified by the rainwater pool 21, effectively removing pollutants in the rainwater, and the purified rainwater is discharged into a regulating reservoir, realizing resource utilization of rainwater, which can be used for flushing the road 4, watering greenery, and replenishing landscape water bodies, reducing the burden on the urban drainage system and reducing water resource consumption; an overflow well 25 and a water distribution pipe 26 are provided in the rainwater pool 21, and by setting different water levels, namely a first water level 27 and a second water level 28, effective management of rainwater during rainstorms and normal periods is achieved.

[0040] In some embodiments, one end of the drainage pipe 23 is connected to the bottom of the overflow well 25, and the other end is connected to the regulating reservoir, so as to drain the rainwater in the overflow well 25 into the regulating reservoir.

[0041] In some embodiments, the road surface of the road 4 is paved with permeable concrete and permeable asphalt, so that rainwater can quickly penetrate into the soil layer below the road surface, significantly reducing road surface water accumulation, improving the drainage efficiency of the road 4, and improving the driving safety of the road 4.

[0042] In some embodiments, the distance between the rainwater pool 21 and the outer wall 3 is D, where D>3m. The location of the rainwater pool 21 needs to be at least 3 meters away from the building foundation to prevent rainwater from soaking the foundation and causing leakage.

[0043] In some embodiments, the permeable layer 13 includes a basic permeable layer 14 and a first loose permeable layer 15; the basic permeable layer 14 is laid on the first soil layer 31, the first loose permeable layer 15 includes side panels 16 and first permeable particles, a plurality of the side panels 16 are fixed at intervals on the basic permeable layer 14, and the first permeable particles are accumulated between the plurality of the side panels 16.

[0044] Optionally, the basic permeable layer 14 is a permeable concrete layer, which has good permeability and bearing capacity, can effectively collect and infiltrate rainwater, and support the weight of the superstructure; the first permeable particles are pebbles, and multiple pebbles are piled between the side panels 16 to form a first loose water-permeable layer. The gaps between the pebbles can ensure the smooth and rapid passage of rainwater, and the side panels 16 can prevent the pebbles from being displaced under the erosion of rainwater.

[0045] In some embodiments, the curb stone 42 is fixed to the side of the road 4 by means of a sleeve pad 46, and the sleeve pad 46 is fixed to the soil layer below the road 4. The sleeve pad 46 has a locking position, and the curb stone 42 is fixed at the locking position; a second loose permeable layer 47 is provided between the sleeve pad 46 and the first soil layer 31, and the second loose permeable layer 47 is formed by the accumulation of second permeable particles, and the second permeable particles are all pebbles, so as to ensure that part of the rainwater seeps through the second loose permeable layer 47.

[0046] Obviously, the above embodiments are only examples for clear explanation, and are not intended to limit the implementation methods. Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the present invention.

Claims

1. A method for renovating old residential areas based on sponge city construction, characterized in that: include: S1: Obtain the annual runoff control rate and non-point source pollution reduction rate of old communities; S2: Based on the annual runoff volume control rate and the non-point source pollution reduction rate, as well as the rainwater engineering of the old residential area, determine the technical measures for transforming the old residential area; For the source of rainwater projects in old residential areas, the renovation measures are permeable pavement and rainwater garden structure; For the transmission of rainwater projects in old residential areas, the transformation measures are to plant grass ditches; For the end of the rainwater project in the old residential area, the renovation measure is the rainwater storage tank; S3: Based on the rainwater engineering and basic buildings of the old residential areas, determine the renovation areas of the old residential areas, which are the exterior wall areas, roads and green areas; S4: Based on the transformation measures, the outer wall area is transformed to obtain a rainwater disconnection node (1), wherein the rainwater disconnection node (1) is suitable for cutting off the flow of rainwater on the surface; S5: Based on the transformation measures, the road and green area are transformed to obtain a rain garden node (2), wherein the rain garden node (2) is suitable for collecting, purifying and reusing rainwater; S6: A monitoring system is set up at the rainwater disconnect node (1) and the rainwater garden node (2) to obtain a composite residential system of a sponge module and an old community.

2. The old residential area reconstruction method based on sponge city construction according to claim 1 is characterized in that: In step S4, the rainwater disconnect node (1) is arranged on the outer wall (3) and the first soil layer (31) located beside the outer wall (3); The rainwater disconnect node (1) comprises: A rainwater downpipe (11) is arranged on the outer wall (3) extending in the height direction, and the rainwater downpipe (11) is bent at one end of the pipe body close to the first soil layer (31) to form a water outlet section (12); A permeable layer (13) is laid on a part of the first soil layer (31). The permeable layer (13) is arranged corresponding to the water outlet (121) of the water outlet section (12), so that rainwater discharged from the water outlet (121) infiltrates through the permeable layer (13) to cut off the flow of rainwater on the surface.

3. The old residential area reconstruction method based on sponge city construction according to claim 2 is characterized in that: In step S5, the rain garden node (2) is arranged on the road (4) and the second soil layer (41) located beside the road (4); The rain garden node (2) comprises: A rainwater pool (21) is provided at the second soil layer (41); The rainwater pool (21) is provided with a purification layer (22), and the purification layer (22) is suitable for purifying rainwater; the rainwater pool (21) is connected to the regulating tank by means of a drainage pipe (23) so as to discharge the purified rainwater into the regulating tank; The road (4) is provided with curb stones (42) at both side edges along the width direction, and the curb stones (42) are penetrated by water holes (43); The second soil layer (41) is formed with an inclined guide surface (44) at the soil section between the road (4) and the rainwater pool (21), and the inclined guide surface (44) is arranged to be inclined downward in a direction close to the rainwater pool (21); The grass-planting ditch (45) is arranged at the inclined guide surface (44) and is extended along the inclined direction of the inclined guide surface (44), and is suitable for guiding rainwater into the rainwater pool (21).

4. The old residential area reconstruction method based on sponge city construction according to claim 3 is characterized in that: The rainwater pool (21) comprises: A pit (24) is formed concavely at the second soil layer (41), and the purification layer (22) is laid on the bottom of the pit (24); An overflow well (25) is arranged inside the pit (24), and an overflow port (251) of the overflow well (25) is arranged higher than the purification layer (22) in the height direction, so that rainwater is retained in the pit (24) to be fully purified; A water distribution pipe (26) is extended and bent to be arranged in the pit (24); one end of the water distribution pipe (26) is in communication with the overflow well (25); the other end is provided with a water distribution port (261); the water distribution port (261) is arranged higher than the overflow port (251) in the height direction; The rainwater pool (21) stores rainwater. When the water level reaches a second water level (28), the rainwater flows into the overflow well (25) through the overflow port (251). When the water level reaches a first water level (27), the rainwater flows into the overflow well (25) through the water diversion port (261). The first water level (27) is higher than the second water level (28) in height direction, and the first water level (27) is suitable for being flush with the pit mouth of the pit (24).

5. The old residential area reconstruction method based on sponge city construction according to claim 4 is characterized in that: One end of the drainage pipe (23) is in communication with the bottom of the overflow well (25), and the other end is in communication with the regulating reservoir.

6. The old residential area reconstruction method based on sponge city construction according to claim 5 is characterized in that: In step S5, the road surface of the road (4) is paved with permeable concrete and permeable asphalt.

7. The old residential area reconstruction method based on sponge city construction according to claim 5 is characterized in that: In step S5, the distance between the rainwater pool (21) and the outer wall (3) is D, where D>3m.

8. The old residential area reconstruction method based on sponge city construction according to claim 3 is characterized in that: The water-permeable layer (13) comprises a basic water-permeable layer (14) and a first loose water-permeable layer (15); The basic water-permeable layer (14) is laid on the first soil layer (31); the first loose water-permeable layer (15) comprises a side plate (16) and first water-permeable particles; a plurality of the side plates (16) are fixed at intervals on the basic water-permeable layer (14); and the first water-permeable particles are piled between the plurality of the side plates (16).

9. The old residential area reconstruction method based on sponge city construction according to claim 8 is characterized in that: The curbstone (42) is fixed to the side of the road (4) by means of a sleeve (46); a second loose permeable layer (47) is provided between the sleeve (46) and the first soil layer (31); the second loose permeable layer (47) is formed by accumulation of second permeable particles.

10. The old residential area reconstruction method based on sponge city construction according to claim 9 is characterized in that: The first water-permeable particles and the second water-permeable particles are both pebbles.

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