Sponge City Rainwater Pipe Network System and Regulation Method for Building Districts

Abstract

The present invention relates to the field of sponge city construction, and provides an adjustable storage and permeable sponge city rainwater pipe network system for building communities, including: a road surface (1); an LID rainwater storage facility (2); a building (3); a rainwater inlet (41) is arranged on the upper surface of the road surface and / or the LID rainwater storage facility, and a rainwater pipe (42), a sedimentation well (43) and a water storage module (44) are all arranged below the road surface and / or the LID rainwater storage facility; a plurality of perforated drainage pipes (5) are arranged in the soil layer below the rainwater pipe and are communicated with the sedimentation well, and a plurality of drainage holes for draining water to the soil layer are arranged on the pipe wall of the perforated drainage pipe; a plurality of vertically arranged rainwater risers (6), the upper end of which is communicated with the roof drainage pipe of the building, and the lower end of which is communicated with the perforated drainage pipe. This system gives play to the infiltration and storage functions of the sponge system, and can simultaneously meet the requirements of storing rainwater flowing into the rainwater inlet and arranging plant landscapes.

Description

Technical Field

[0001] The present invention relates to the field of sponge city construction, and particularly to a new adjustable storage and permeable sponge city rainwater pipe network system for building communities. Background Art

[0002] At present, the construction of sponge cities has been fully carried out in China. In the face of the technical problems in sponge city construction, various new practices and novel materials have been designed and developed one after another, enabling the smooth progress of sponge city construction.

[0003] At present, the main concept of sponge cities is first to reduce the comprehensive net runoff coefficient within the site to reduce the rainwater runoff volume, and then to reduce the discharge of the already generated runoff rainwater through LID water storage facilities, so as to achieve the sponge city concept of "infiltration, retention, storage, purification, utilization, and discharge" in sequence. However, when this concept is applied to building communities, it conflicts with the landscape design of the community. The reason is that: the landscape design requires a sense of hierarchy in the landscape effect, so it also requires undulating terrain. However, for the sponge city to meet the water storage needs of the community, more low-lying terrains are needed to create sponge facilities such as sunken green spaces and rain gardens. After combining these two concepts, the construction of the community often leads to two results. The sponge indicators of the community are met, but there are too many and too deep sunken facilities, resulting in a poor landscape effect; or the landscape effect is met, but due to shaping the terrain, there is a lack of sponge facilities, so the sponge indicators cannot be met.

[0004] Chinese Patent Application CN206667418U discloses a sponge city rainwater collection and reuse system for building communities, aiming to purify and store the rainwater in the building community through the rainwater collection and reuse system, and then reuse it for greening, car washing, and road flushing. However, this patent has the following 4 disadvantages:

[0005] 1) Although this method can improve the rainwater reuse rate, the cost performance is too low. If each community wants to reuse rainwater, a set of rainwater purification systems need to be rebuilt, which not only increases the initial cost, but also requires special personnel for maintenance in the later stage, greatly increasing the construction cost and equipment operation cost. If there is no maintenance in the later stage, this set of equipment is likely to be abandoned, not only resulting in waste of funds, but also possibly causing poor drainage of the existing rainwater system.

[0006] 2) This solution does not implement the concept of "infiltration, retention, storage, purification, utilization, and discharge" in the sponge city in sequence. The more important thing in sponge city construction is to effectively infiltrate rainwater into the ground and retain rainwater in the community before storage, purification, utilization, and discharge. The focus of this solution starts from storage, abandoning the concepts of infiltration and retention, and does not fully conform to the sponge concept.

[0007] 3) Although this plan can use water storage facilities to regulate rainwater, it does not effectively solve the conflict between sponge indicators and landscape design in sponge cities. If you want to effectively retain a sufficient amount of rainwater without affecting the landscape function, you need to add sufficiently large water storage facilities, which not only increases the construction cost, but such a large underground water storage facility also reduces the safety and comfort of community use.

[0008] 4) This solution is not suitable for areas such as the south where rainfall lasts for a long time and has a long cycle. Due to the long duration and high continuity of rainfall, the land remains moist all the time, and the rainwater in the water storage facilities cannot be reused for watering flowers and washing roads. Long-term storage will not only make the water black and smelly and cannot be reused, but also long-term water storage will affect the operation of the equipment and increase the maintenance frequency.

[0009] Chinese patent application CN204898855U discloses a rainwater comprehensive utilization system for a sponge community, which includes: an initial rainwater storage tank, an underground regulating tank, a rainwater storage tank, an irrigation pump, a pumping pump, an irrigation network, a pumping network, a reclaimed water network, etc. Rainwater is stored in stages through the initial rainwater storage tank, the underground regulating tank, and the rainwater storage tank. After the rainwater is purified, it is reused for irrigation and reclaimed water through irrigation pumps and pumping pumps. However, this patent has the following four disadvantages:

[0010] 1) Disadvantages: Like the previous patent, this patent requires a series of rainwater collection system electronic control systems, rainwater treatment systems, and pipeline reuse systems. Not only is the cost high, but damage to any link will delay the use of the entire system, and the safety of rainwater discharge cannot be guaranteed.

[0011] 2) The system collects all the rainwater from roofs, roads and pavements and then reuses it. Although it can solve some landscape and terrain problems, the amount of rainwater infiltration is small. In areas with relatively concentrated rainstorms or relatively continuous rainfall, the amount of rainwater reuse is small, which will still cause a large amount of rainwater to be discharged, and it cannot effectively retain rainwater.

[0012] 3) After the rainwater is decentralized and stored, part of the rainwater cannot be used in a unified manner, resulting in the rainwater in some locations being unable to be reused for a long time, turning black and smelly, seriously affecting the living comfort of users in the community.

[0013] 4) The land built by this patent has many automatic control systems and pipe network systems, and various control circuits are spread throughout the underground. If it is not properly maintained, safety accidents such as leakage are very likely to occur.

[0014] In summary, we seek an infiltration-type regulating sponge facility that is low-cost, easy to maintain, and low-cost, and that effectively achieves the sponge concept without affecting the landscape function. Summary of the invention

[0015] The technical object of the present invention is to solve the defects of the above-mentioned prior art, and provide an adjustable storage and permeable sponge city rainwater pipe network system for buildings, so as to achieve the purposes of infiltration, detention, storage and drainage.

[0016] As an aspect of the present invention, there is provided an adjustable storage and permeable sponge city rainwater pipe network system for a building community, including:

[0017] Road surface;

[0018] LID rainwater storage and regulation facilities;

[0019] Building;

[0020] A water storage device, including a rainwater inlet, a rainwater pipe, a sedimentation well and a water storage module. The rainwater inlet is arranged on the upper surface of the road surface and / or the LID rainwater storage and regulation facilities. The rainwater pipe, the sedimentation well and the water storage module are all arranged in the soil layer below the road surface and / or the LID rainwater storage and regulation facilities. The rainwater inlet and the sedimentation well, and the sedimentation well and the water storage module are connected through the rainwater pipe;

[0021] Multiple perforated drainage pipes are arranged in the soil layer below the rainwater pipe and communicate with the sedimentation well. A plurality of drainage holes for draining water to the soil layer are arranged on the pipe wall of the perforated drainage pipe;

[0022] Multiple vertically arranged rainwater risers, the upper ends of which are connected to the roof drainage pipes of the building, and the lower ends are connected to the perforated drainage pipes.

[0023] According to an exemplary embodiment of the present invention, the road surface and the LID rainwater storage and regulation facilities are connected and are jointly arranged between buildings.

[0024] According to an exemplary embodiment of the present invention, the water storage device further includes a plurality of water storage pipes. There are multiple sedimentation wells. Each water storage pipe connects two sedimentation wells and is connected to multiple perforated drainage pipes. The height of the water storage pipe is lower than the height of the rainwater pipe.

[0025] According to an exemplary embodiment of the present invention, one end of the perforated drainage pipe is connected to the water storage pipe, and the other end is connected to the rainwater riser. When it rains, since the water in the rainwater riser flows from the roof downward to the perforated drainage pipe, the soil in the perforated drainage pipe can be washed to the sedimentation well and discharged.

[0026] According to an exemplary embodiment of the present invention, the perforated drainage pipe is connected to the water storage pipe through a connecting fitting. The connecting fitting vertically passes through the lower part of the water storage pipe, and an opening communicating with the water storage pipe is provided in the water storage pipe.

[0027] According to an exemplary embodiment of the present invention, the calculation formula for the diameter of the water storage pipe is as follows:

[0028]

[0029] Wherein,

[0030] D is the pipeline diameter, with the unit of m;

[0031] V is the amount of rainwater to be stored and regulated in the plot, with the unit of m 3 ;

[0032] S is the laying area of the gravel layer, with the unit of m 2 ;

[0033] h is the thickness of the gravel layer, with the unit of m (generally taken as 0.3 - 0.4 m);

[0034] n is the porosity of the gravel layer (generally taken between 0.19 - 0.32);

[0035] L is the length of the water storage pipeline in the plot, with the unit of m;

[0036] π is 3.1415926.

[0037] According to an exemplary embodiment of the present invention, the material of the water storage pipe includes plastic, concrete, metal or reinforced concrete.

[0038] According to an exemplary embodiment of the present invention, the metal includes cast iron, stainless steel or steel.

[0039] According to an exemplary embodiment of the present invention, the water storage pipe adopts an HDPE double-wall corrugated drainage pipe.

[0040] According to an exemplary embodiment of the present invention, a cleaning port is provided on the rainwater riser.

[0041] According to an exemplary embodiment of the present invention, the cleaning port is 0.8 - 1.2 m above the road surface, preferably 1 m.

[0042] According to an exemplary embodiment of the present invention, the inner diameter of the perforated infiltration and drainage pipe is greater than 50 mm. The pipe diameter of the perforated infiltration and drainage pipe is related to the catchment area of the building community roof.

[0043] According to an exemplary embodiment of the present invention, the perforated infiltration and drainage pipe adopts a plastic infiltration and drainage pipe.

[0044] According to an exemplary embodiment of the present invention, a gravel cushion layer is provided around the perforated infiltration and drainage pipe.

[0045] According to an exemplary embodiment of the present invention, the road surface adopts a non-permeable paving material.

[0046] According to an exemplary embodiment of the present invention, the road surface includes: a sidewalk, and / or a concrete road, and / or a parking space.

[0047] According to an exemplary embodiment of the present invention, the height of the rainwater inlet located on the upper surface of the road surface is lower than the lowest height of the road surface, and the height of the rainwater inlet located on the upper surface of the LID rainwater storage and regulation facility is between the highest and lowest heights of the LID rainwater storage and regulation facility.

[0048] According to an exemplary embodiment of the present invention, the water storage module includes a reservoir, a drainage pump, and a drainage pipe. The drainage pump is arranged in the reservoir, one end of the drainage pipe is connected to the drainage pump, and the other end extends towards the water storage pipe and / or the sedimentation well.

[0049] As another aspect of the present invention, there is provided a method for rainwater storage and regulation in a building community, including the following steps:

[0050] Adopt the adjustable and permeable sponge city rainwater pipe network system for the building community;

[0051] When it rains, the rainwater on the roof of the building is discharged along the rainwater riser into the perforated infiltration and drainage pipe, and then the rainwater is discharged into the soil layer through the perforated infiltration and drainage pipe. The rainwater that fails to be infiltrated and drained in time is stored in the sedimentation well; the rainwater on the road surface and the rainwater exceeding the storage and regulation capacity of the LID rainwater storage and regulation facility are converged into the sedimentation well through the rainwater pipe;

[0052] After the rainfall stops, the rainwater in the sedimentation well continuously infiltrates into the soil layer through the perforated infiltration and drainage pipe;

[0053] The rainwater exceeding the storage and regulation capacity of the sedimentation well is discharged into the water storage module.

[0054] According to an exemplary embodiment of the present invention, the perforated infiltration and drainage pipe discharges rainwater into the sedimentation well through the water storage pipe and stores it in the water storage pipe and / or the sedimentation well; the rainwater in the sedimentation well and / or the water storage pipe is discharged into the perforated infiltration and drainage pipe through the water storage pipe.

[0055] The beneficial effects of the present invention are as follows:

[0056] The present invention maximally exerts the infiltration and storage functions of the sponge system, and uses the water storage pipes passing through the sedimentation wells between the building groups to maximally replace the sunken rainwater storage and regulation pools, which can completely solve the problem of the conflict between the rainwater storage and regulation pool and the landscape terrain in the sponge city design, so that the design height of the rainwater storage and regulation pool does not need to be too low, and it can simultaneously meet the requirements of storing rainwater flowing into the rainwater inlet and arranging plant landscapes. Specifically, it is elaborated from the following aspects:

[0057] (1) The infiltration function of the sponge system is maximally exerted. The water storage pipe maximally replaces the water volume that needs to be stored in the sunken green LID rainwater storage facility. After calculation, the water storage capacity of this method is higher than the water volume that needs to be stored in the sunken green LID rainwater storage facility, which can reduce or replace the design and construction of the above-ground green LID rainwater storage facility. Therefore, the problem of conflict between sponge facilities and landscape terrain in sponge city design can be completely solved.

[0058] (2) Low cost. The perforated drainage pipe can adopt the mature PVC-U drainage pipe, and the water storage pipe can adopt the HDPE double-wall corrugated drainage pipe with an enlarged diameter. The burial method of the pipeline is the same as that of the normal drainage pipeline. Compared with the normal rainwater pipe network layout, it will not increase the excessive cost. Since the sponge project can be realized only by adopting the rainwater pipe network layout method in the present invention, there is no need to lay additional high-cost sponge materials and set up a set of rainwater storage ponds covering the entire terrain, saving a large amount of costs.

[0059] (3) Easy and simple post-maintenance, low maintenance cost. During rainfall, rainwater enters the perforated drainage pipe after passing through the rainwater riser. Due to the hydraulic scouring, the perforated drainage pipe is not easily blocked by the silt of rainwater, ensuring the hydraulic smoothness of the perforated drainage pipe; during non-rainfall periods, the rainwater stored in the water storage pipe is used to supplement the rainwater in the perforated drainage pipe, and the rainwater infiltrates naturally, so it is also free from manual maintenance; the only part that needs to be manually controlled is the emptying pump group of the water storage module. The sewage discharged by the pump group can be reused for watering flowers, or backfilled into the water storage pipe, or discharged; therefore, the system is easy to operate, does not require special personnel for maintenance, and can also maintain stable operation for a long time.

[0060] (4) Reduce the greening cost. Through the osmotic pressure of the water system, the rainwater infiltrated outward by the perforated drainage pipe can provide sufficient water supply guarantee for deep-rooted trees and shrubs, improving the survival rate of seedlings, thereby reducing the watering cost and maintenance cost of greening.

[0061] (5) Solve the problem of black and odorous rainwater in the water storage module. If the water in the water storage module is stored for a long time without reuse, it needs to be discharged in time. If not discharged, it will cause the water body to turn black and odorous after long-term accumulation. After a long period of rainfall, the soil moisture content in the green space is relatively high, and the water in the water storage module cannot be immediately reused for green space irrigation, resulting in long-term storage. When reused for irrigation, it will produce a pungent smell, seriously affecting the living comfort of the community. If the water in the water storage module is stored for a long time and not used in time, it can be backfilled into the water storage pipe and continue to infiltrate through the perforated drainage pipe of the system. This not only improves the utilization rate of the water body, realizes the sponge function, but also solves the problem that the rainwater cannot be used after turning black and odorous.

[0062] (6) Solved the problem of freeze-thaw of permeable hardened ground in the north. When using permeable materials for sponge transformation in the northern region, the permeable materials are extremely prone to frost heaving and freeze-thaw phenomena in winter. It can be said that some permeable facilities are not suitable for northern facilities; if this system is used to make a sponge, the surface paving and hardened part of the road surface can completely adopt the traditional hardening method, and use the underground infiltration and drainage function of the perforated infiltration and drainage pipe to replace the function of the original sponge permeable surface hardened surface infiltration, which not only plays a role in infiltration, but also increases the infiltration volume; and with the promotion of sponge cities, the price of sponge construction materials has also risen. However, the hardened part of the present invention uses the original mature non-permeable hardened road surface method for construction, which reduces the production cost of the hardened road surface of the site and further reduces the one-time construction cost.

[0063] (7) It is precisely because this system improves the rainwater pipe network, has a simple structure, is easy to maintain, and can achieve the purposes of infiltration, retention, storage, and drainage, and can better highlight the sponge function. Brief Description of the Drawings

[0064] Figure 1 The layout plan of the rainwater pipe network system of the sponge city is given.

[0065] Figure 2 Partial schematic diagrams of the A-A section are given.

[0066] Figure 3 Partial schematic diagrams of the B-B section are given.

[0067] Figure 4 A three-dimensional view of a section of the water storage pipe and the pipe fitting interface is given.

[0068] Figure 5 A top view of a section of the water storage pipe and the pipe fitting interface is given.

[0069] Figure 6 Schematic diagrams of the splicing of multiple sections of water storage pipes are given.

[0070] Among them, 1 - road surface, 11 - sidewalk, 12 - concrete road, 13 - parking space, 2 - LID rainwater storage and regulation facilities, 3 - building, 41 - rainwater inlet, 42 - rainwater pipe, 43 - sedimentation well, 44 - water storage module, 45 - water storage pipe, 451 - socket inlet end, 452 - socket outlet end, 46 - connecting pipe fitting, 5 - perforated infiltration and drainage pipe, 6 - rainwater riser, 7 - cleanout, 8 - gravel cushion layer. Detailed Description of the Specific Embodiment

[0071] The following provides a detailed description of the embodiments of the present invention. However, the present invention can be implemented in many different ways defined and covered by the claims.

[0072] According to the first embodiment of the present invention, in order to solve the technical barriers encountered in the current construction of sponge cities and reduce the operation and maintenance costs of sponge cities, a sponge city rainwater pipe network system that can be adjusted for storage and permeable for building communities is provided. As Figure 1 shown, it includes: a road surface 1, an LID rainwater storage and regulation facility 2, a water storage device, multiple perforated drainage pipes 4, and multiple rainwater risers 6. This rainwater pipe network system is mainly applied to scenarios with a large number of buildings, such as residential communities, office areas, etc.

[0073] As Figure 1 and Figure 2 shown, the road surface 1 includes a sidewalk 11, a concrete road 12, and a parking space 13. The road surface 1 is a hardened road and uses non-permeable paving materials, such as non-permeable asphalt or non-permeable concrete. The sidewalk 11 is at a higher level, and when it rains, the water flows towards the concrete road 13. The parking space 13 has a slope structure, and the height at its connection with the concrete road 12 is lower. When it rains, the water flows towards the concrete road 12; the height at the connection of the parking space 13 with the LID rainwater storage and regulation facility 2 is higher. The LID rainwater storage and regulation facility 2 is at approximately the same overall height as the road surface 1, and a sunken green LID rainwater storage and regulation facility is adopted. Plants are planted inside the facility for storing a portion of the rainwater. The road surface 1 and the LID rainwater storage and regulation facility 2 are laid between the building buildings 3.

[0074] As Figure 2 shown, below the road surface 1 and the LID rainwater storage and regulation facility 2 is a soil layer.

[0075] As Figures 1-3As shown in the figure, the water storage device includes a rainwater inlet 41, a rainwater pipe 42, a sedimentation well 43, a water storage module 44, and a water storage pipe 45. The rainwater inlet 41 is arranged on the upper surfaces of the concrete road 12 of the road surface 1 and the LID rainwater storage and regulation facility 2. The height of the rainwater inlet 41 arranged on the concrete road 12 is at the lowest point of the road surface 1, so that the rainwater on the surface of the road surface 1 flows into the rainwater inlet 41; the rainwater inlet 41 arranged on the LID rainwater storage and regulation facility 2 is an overflow type rainwater inlet, and its height is higher than the highest height of the LID rainwater storage and regulation facility 2 and lower than its lowest height, so that the rainwater exceeding the storage and regulation capacity of the LID rainwater storage and regulation facility 2 and higher than the rainwater inlet flows into the rainwater inlet 41. When the LID rainwater storage and regulation facility 2 cannot store and regulate rainwater, the rainwater will accumulate on the upper surface of the LID rainwater storage and regulation facility 2. When it reaches the height of the rainwater inlet 41, the rainwater will flow into the rainwater inlet 41. The rainwater pipe 42, the sedimentation well 43, the water storage module 44, and the water storage pipe 45 are all arranged in the soil layer below the road surface 1 and / or the LID rainwater storage and regulation facility 2. The rainwater inlet 41 and the sedimentation well 43 are connected by the rainwater pipe 42, and the sedimentation well 43 and the water storage module 44 are connected by the rainwater pipe 42. Every two sedimentation wells 43 are connected by the water storage pipe 45. The diameter of the rainwater pipe 42 can be calculated according to Section 4.2 of the Code for Design of Outdoor Wastewater Engineering GB50014-2006.

[0076] There are multiple sedimentation wells 43. An artificial passage communicating with the road surface 1 is arranged above, and a sedimentation tank for sedimentation is arranged below. The silt in the sedimentation well 43 can be cleaned regularly to keep the rainwater pipe network unobstructed. An overflow port is arranged on the upper part of the water storage module 44, and the overflow port is connected with the municipal rainwater pipe network system through the rainwater pipe 42. The water storage module 44 includes a water storage tank, a drainage pump, and a drainage pipe. The drainage pump can adopt a submersible pump, which is close to the inner wall of the water storage module 44 and installed at the bottom of the water storage tank. One end of the drainage pipe is connected with the drainage pump, and the other end extends towards the water storage pipe 45 and / or the sedimentation well 43. If necessary, a port connecting the LID rainwater storage and regulation facility 2 and / or connecting the municipal rainwater pipe network can also be opened. In this way, the accumulated rainwater can be used to irrigate the vegetation of the LID rainwater storage and regulation facility 2, returned to the water storage pipe 45 so that the rainwater seeps into the soil layer through the perforated drainage pipe 5 or discharged into the municipal rainwater pipe network, preventing the rainwater from accumulating and causing blackening and stinking. As long as a pump start-stop control device is set at a suitable position on the ground or in the property control room, just turn on the power during use, and the maintenance is convenient. Multiple water storage modules 44 can be set when necessary. Since the water storage pipe 45 plays the role of rainwater drainage and storage, the diameter of the water storage pipe 45 should be large enough and the bearing capacity should be strong enough. The diameter should be compared with the diameter of the rainwater pipe 42 calculated for this plot. The diameter of the water storage pipe 45 is larger than the diameter of the rainwater pipe 42, and the height of the water storage pipe 45 is lower than the height of the rainwater pipe 42. The diameter of the water storage pipe 45 is 200-400mm larger than the diameter of the rainwater pipe 42 or satisfies the following formula:

[0077]

[0078] Where D is the diameter of the water storage pipe, in meters;

[0079] V is the amount of rainwater that needs to be stored in the plot, in m 3 ;

[0080] S is the gravel layer paving area, unit is m 2 ;

[0081] h is the thickness of the gravel layer, in meters, and a gravel layer with a thickness of 0.3-0.4m is usually selected;

[0082] n is the porosity of the crushed stone layer, usually 0.19-0.32;

[0083] L is the length of the water storage pipeline within the plot, in meters;

[0084] π is 3.1415926;

[0085] When the diameter calculated by the above formula is smaller than the diameter of the rainwater pipe 42 , the diameter of the water storage pipe 45 is taken as the diameter of the rainwater pipe 42 .

[0086] The construction and installation of the water storage pipe 45 must meet the national technical requirements for drainage pipes in building communities. When the water storage pipe 45 is buried under the roadway, the soil cover on the pipe surface shall not be less than 0.7m (that is, the water storage pipe 45 is located at least 0.7m below the roadway). When the water storage pipe 45 is buried under the sidewalk or green plants, the soil cover on the pipe surface shall not be less than 0.6m (that is, the water storage pipe 45 is located at least 0.6m below the sidewalk or green plants). When the water storage pipe 45 is laid out along the direction of the water flow, it is necessary to arrange it with a certain slope. The heights of the two ends of the water storage pipe 45 are different to ensure that rainwater has sufficient hydraulic scouring on the inner wall of the pipe. The silt in the water storage pipe 45 can be washed by rainwater to the lower end of the water storage tank 45 and flushed into the bottom of the silt well 43 to prevent congestion. Usually, the depth of the silt well 43 is different, and the connection between the water storage pipe 45 and the silt well 43 is higher than the bottom of the silt well 43. The slope of DN300 pipes shall not be less than 0.3%, the slope of DN400 pipes shall not be less than 0.25%, the slope of DN500 pipes shall not be less than 0.2%, the slope of DN600 and DN700 pipes shall not be less than 0.15%, and the slope of pipes above DN800 shall not be less than 0.1%. DN indicates the diameter of the pipe, DN300 indicates that the nominal diameter of the pipe is 300mm, and the same applies to other pipes.

[0087] The material of the water storage pipe 45 can use the technically mature and low-cost HDPE double-wall corrugated pipe, so that the water storage pipe 45 not only has the function of connecting the sedimentation well 43, but also has a strong water storage and load-bearing function. The water storage pipe 45 can also be made of plastic, concrete, metal or reinforced concrete. The metal materials include cast iron, stainless steel or steel. The material costs of the road surface 1, the rainwater pipe 42, the sedimentation well 43, the water storage module 44 and the water storage pipe 45 are low, and there is no need for frequent maintenance and replacement. Moreover, it can achieve a good effect of rainwater regulation and storage, and is more suitable for communities with a large flow of people.

[0088] As Figures 1-3 shown, multiple perforated drainage pipes 5 are arranged in the soil layer below the rainwater pipe 41 and are connected to the sedimentation well 43 through the water storage pipe 45. The perforated drainage pipes 5 are horizontally arranged below the road surface 1 and / or the LID rainwater regulation and storage facility 2, one end is connected to the water storage pipe 45, and the other end is connected to the rainwater riser 6. The laying height of the perforated drainage pipe 5 is 100 mm higher than the bottom of the water storage pipe 45, so that the silt in the perforated drainage pipe 5 can be effectively washed into the water storage pipe 45 by the roof rainwater, and it can be ensured that the silt does not accumulate in the perforated drainage pipe 5 and cause pipe blockage. The perforated drainage pipes in the prior art are usually used to drain the surface infiltrated rainwater into the rainwater pipe network, while the perforated drainage pipe 5 in this application is buried deep underground and uses it to infiltrate the rainwater into the ground, which can make the water infiltrate and recharge the groundwater. The inner diameter of the perforated drainage pipe 5 is greater than 50 mm, and the preferred range of the pipe diameter of the perforated drainage pipe 5 is 50 mm - 400 mm. The specific pipe diameter value can be determined according to the rainwater volume of the building roof (including the maximum drainage volume of gravity flow or the maximum drainage volume of pressure flow), as shown in Table 1-1:

[0089] Pipe diameter Maximum discharge of gravity flow (L / s) Maximum discharge of pressure flow (L / s) DN50 4.2 6.0 DN75 7.1 18.6 DN100 7.4 41.0 DN150 13.7 53.7 DN200 42.0 -

[0090] Table 1-1 Comparison table of the maximum drainage volume and pipe diameter of the perforated drainage pipe 5 for gravity flow and pressure flow

[0091] If a siphonic roof drainage system is adopted, the pipe diameter is judged by the maximum drainage volume of pressure flow; if a gravity roof drainage system is adopted, the pipe diameter is judged by the maximum drainage volume of gravity flow.

[0092] For example: when the calculated drainage volume of the roof rainwater is 10 L / s, when choosing a siphonic roof drainage system, the perforated drainage pipe 5 with DN75 is selected; when choosing a gravity drainage system, the perforated drainage pipe 5 with DN150 is selected.

[0093] The rainwater flow of the building roof should be calculated according to the following formula:

[0094]

[0095] Among them, q y represents the designed rainwater flow, and the unit is L / s;

[0096] q j represents the design rainstorm intensity, with the unit of L / (s·hm 2 ), and since the rainstorm intensity varies in each city, it is calculated according to the rainstorm intensity formula of each city. The recurrence period of the rainstorm intensity for general building roofs shall not be less than 5 years, and that for important public building roofs shall not be less than 10 years;

[0097] ψ represents the runoff coefficient;

[0098] F w represents the catchment area, with the unit of m 2 .

[0099] The pipe wall of the perforated drainage pipe 5 is provided with a plurality of drainage holes for draining water into the soil layer, which is conducive to the slow and uniform infiltration of rainwater. The perforated drainage pipe 5 can adopt a PVC-U material drainage pipe or a metal pipe, with low cost. A gravel cushion layer 8 is provided around the perforated drainage pipe 5, which can enable the drainage holes to better drain rainwater, can also accumulate part of the rainwater, and at the same time provide a supporting force for the perforated drainage pipe 5, effectively dispersing the force borne above the perforated drainage pipe 5, so that the perforated drainage pipe 5 is not easily damaged. One end of the perforated drainage pipe 5 is connected to the water storage pipe 45, and the other end is connected to the lower end of the rainwater riser 6. The perforated drainage pipe 5 is connected to the water storage pipe 45 through the connecting fitting 46, and the connection method is carried out in accordance with the national standard 04S520-25 method. As Figures 4-6 shown, the water storage pipe 45 has multiple sections, and the multiple sections of the water storage pipe 45 are connected end to end. Each section includes two ports, namely the socket inlet end 451 and the socket outlet end 452. The socket inlet end 451 of one section of the water storage pipe 45 is connected to the socket outlet end 452 of another section of the water storage pipe 45. The connecting fitting 46 vertically penetrates the lower part of the water storage pipe 45 and has an opening in the water storage pipe 45 that communicates with the water storage pipe 45, preferably located at the connection of two sections of the water storage pipe 45 to make the connection more firm. The connection method between the water storage pipe 45 and the connecting fitting 46 is carried out in accordance with the national standard 04S520-21 method. The perforated drainage pipe 5 is connected to the connecting fitting 46 extending outside the water storage pipe 45.

[0100] As Figure 1 and Figure 2 shown, there are multiple rainwater risers 6, which are vertically arranged on the outer surface of the building 3. Its upper end is connected to the water-dispersing slope on the roof of the building 3 for draining the water on the roof of the building 3; its lower end extends into the soil layer and is connected to one end of the perforated drainage pipe 5. The calculation method of the pipe diameter of the rainwater riser 6 is the same as that of the perforated drainage pipe 5. A cleaning port 7 is provided on the pipe wall of the rainwater riser 6, and the height of the cleaning port 7 above the road surface 1 is 0.8 - 1.2 m, preferably 1 m. Such a height is more suitable for cleaning out. The cleaning port 7 can facilitate the use of a cleaning device to dredge the congestion between the cleaning port 7 and the water storage pipe 45.

[0101] In the initial stage of rainfall, due to the height difference between the roof and the soil layer, water flows from the rainwater riser 6 into the perforated drainage pipe 5 and enters the soil layer or the water storage pipe 45 through the drainage holes of the perforated drainage pipe 5. At the same time, by utilizing the hydraulic action, the silt in the perforated drainage pipe 5 is washed into the sedimentation well 43 to prevent the perforated drainage pipe 5 from being blocked. When there is excessive rain, the rainwater flows along the surface slope into the rain inlet 41 on the road or is discharged into the LID rainwater storage and regulation facility 2. The vegetation on the LID rainwater storage and regulation facility 2 can absorb part of the rainwater, and the excess rainwater flows into the rainwater pipe 42 through the rain inlet 41. The rainwater pipe 42 discharges the rainwater into the sedimentation well 43. The rainwater will first accumulate in the sedimentation well 43 and the water storage pipe 45, and part of the rainwater seeps into the ground through the perforated drainage pipe 5. When the sedimentation well 43 is full of accumulated rainwater, the excess rainwater flows into the water storage module 44 through the rainwater pipe 42 for storage. If the rainwater exceeds the storage and regulation capacity of the water storage module 44, it will flow out from the overflow port of the water storage module 44 and be discharged into the municipal rainwater pipe network system.

[0102] During the non-rainfall period, the drainage pump of the water storage module 44 discharges the accumulated rainwater back into the water storage pipe 45. The rainwater naturally infiltrates deep into the soil layer through the drainage holes of the perforated drainage pipe 5 to replenish the groundwater, eliminating the need for manual maintenance and preventing the water in the water storage module 44 from accumulating for too long and becoming black and smelly. The accumulated rainwater can also be reused to the LID rainwater storage and regulation facility 2 to irrigate the vegetation.

[0103] Due to the use of the water storage device, which can both store and drain water, the road surface 1 can directly use a hardened road surface without the need for permeable bricks used in sponge construction, preventing the freeze-thaw problem of hardened permeable bricks in the north. The underground drainage function of the perforated drainage pipe 5 replaces the function of the original sponge permeable ground surface. It not only plays a role in infiltration but also increases the infiltration volume, avoiding the need for a large area of the sponge system to occupy the ground to set up sunken rainwater storage and regulation ponds that are much lower than the ground, and can completely solve the problem of conflicts between sponge facilities and landscape topography in sponge city design.

[0104] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An adjustable storage and permeable sponge city rainwater pipe network system for a building community, characterized in that, it includes: a road surface (1); LID rainwater storage and regulation facilities (2); a building (3); a water storage device, including a rainwater inlet (41), a rainwater pipe (42), a sedimentation well (43), a water storage module (44) and multiple water storage pipes (45). The rainwater inlet (41) is arranged on the upper surface of the road surface (1) and / or the LID rainwater storage and regulation facilities (2). The rainwater pipe (42), the sedimentation well (43) and the water storage module (44) are all arranged in the soil layer below the road surface (1) and / or the LID rainwater storage and regulation facilities (2). The rainwater inlet (41) and the sedimentation well (43) are connected by the rainwater pipe (42), and the sedimentation well (43) and the water storage module (44) are connected by the rainwater pipe (42). There are multiple sedimentation wells (43). Each water storage pipe (45) connects two sedimentation wells (43) and is connected to multiple perforated drainage pipes. The height of the water storage pipe (45) is lower than the height of the rainwater pipe (42); multiple perforated drainage pipes (5), arranged in the soil layer below the rainwater pipe (42) and communicating with the sedimentation well (43). Multiple drainage holes for draining water to the soil layer are provided on the pipe wall of the perforated drainage pipe (5). A gravel cushion layer (8) is provided around the perforated drainage pipe (5); multiple vertically arranged rainwater risers (6), the upper ends of which are connected to the roof drainage pipes of the building (3), and the lower ends of which are connected to the perforated drainage pipes (5), wherein, the pipe diameter of the water storage pipe (45) satisfies the following formula: wherein, D is the diameter of the water storage pipe, in m; V is the amount of rainwater that needs to be stored and regulated in the plot, with the unit of m 3 ; S is the laying area of the crushed stone cushion, and the unit is m 2 ; h is the thickness of the gravel cushion layer, in m, and a gravel cushion layer with a thickness of 0.3 - 0.4 m is selected; n is the porosity of the gravel cushion layer, which is 0.19 - 0.32; L is the length of the water storage pipe line in the plot, in m; π is 3.1415926; when the diameter calculated by the above formula is smaller than the pipe diameter of the rainwater pipe (42), the numerical value of the pipe diameter of the water storage pipe (45) is taken as the pipe diameter of the rainwater pipe (42).

2. The adjustable storage and permeable sponge city rainwater pipe network system for a building community according to claim 1, characterized in that, one end of the perforated drainage pipe (5) is connected to the water storage pipe (45), and the other end is connected to the rainwater riser (6).

3. The adjustable storage and permeable sponge city rainwater pipe network system for a building community according to claim 2, characterized in that, the perforated drainage pipe (5) is connected to the water storage pipe (45) through a connecting fitting (46).

4. The adjustable storage and permeable sponge city rainwater pipe network system for a building community according to claim 1, characterized in that, a cleaning port (7) is provided on the rainwater riser (6).

5. The adjustable storage and permeable sponge city rainwater pipe network system for a building community according to claim 1, characterized in that, the inner diameter of the perforated drainage pipe (5) is greater than 50 mm.

6. The adjustable storage and permeable sponge city rainwater pipe network system for a building community according to claim 1, characterized in that, The height of the rainwater inlet (41) located on the upper surface of the road surface is lower than the lowest height of the road surface (1), and the height of the rainwater inlet (41) located on the upper surface of the LID rainwater storage facility is between the highest and lowest heights of the LID rainwater storage facility (2).

7. The adjustable and permeable sponge city rainwater pipe network system for building communities according to claim 1, characterized in that the water storage module includes a water storage tank, a drainage pump and a drainage pipe. The drainage pump is arranged in the water storage tank. One end of the drainage pipe is connected to the drainage pump, and the other end extends towards the water storage pipe (45) and / or the sedimentation well (43).

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