Urban building roof rainwater collection, storage and utilization system
By treating rainwater through multi-stage filtration and sedimentation, combined with the design of underground buried components, the problems of pollutant hazards and space occupation in urban building roof rainwater harvesting systems applied in residential communities have been solved, achieving efficient utilization of rainwater and space saving.
Patent Information
- Application Number
- CN202520131789.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-20
- Publication Date
- 2025-12-30
- Estimated Expiration
- 2035-01-20
AI Technical Summary
Existing urban building roof rainwater harvesting systems used in urban residential areas often produce rainwater containing a lot of oil, impurities, and pollutants. Directly using this rainwater for plant irrigation can harm plants, and the systems also occupy a large amount of ground space, making it difficult to meet the needs of compact space layouts.
A rainwater harvesting and utilization system for urban building roofs was designed, including downpipes, rainwater collection pipes, diversion devices, sedimentation tanks, diversion pipes, underground rainwater collection tanks, and submersible pumps. The system treats rainwater through multi-stage filtration and sedimentation to ensure rainwater quality before using it for green space irrigation and road washing. The system components are buried underground to save ground space.
It achieves efficient rainwater filtration and collection, meeting the needs of plant irrigation and road cleaning, avoiding damage to plants, saving ground space, and adapting to the needs of dense building layouts in urban communities.
Smart Images
Figure CN223738853U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of urban building ancillary facilities technology, specifically to an urban building roof rainwater collection and utilization system. Background Technology
[0002] The statements herein provide only background information related to this invention and do not necessarily constitute prior art.
[0003] Currently, in various urban residential areas, the exterior walls of buildings are equipped with downpipes. The top of the downpipe extends to the roof and the bottom extends to the ground. The downpipes collect rainwater from the building roof and discharge it to the ground, preventing rainwater from accumulating on the roof. However, the rainwater discharged from the downpipes flows directly to the ground, resulting in a waste of rainwater resources.
[0004] Patent CN218758355U discloses a roof rainwater harvesting device, which involves burying a water storage tank below ground level. The water storage tank receives rainwater falling from the roof through an inlet pipe. The water storage tank is connected to multiple water conveying belts, which are arranged in multiple layers along the depth of the plant roots. One end of the water conveying belt is fixedly connected to the water storage tank, and the other end radiates to the plant roots. This allows the water in the water storage tank to be directly delivered to the plant roots, providing water for the plants and realizing the utilization of rainwater resources. However, when the above-mentioned rainwater harvesting device is applied to urban communities, the urban rainwater contains a lot of oily impurities and pollutants, so directly using it for plant irrigation will cause certain harm to the plants. Utility Model Content
[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide an urban roof rainwater harvesting and utilization system that meets the needs of urban residential areas for rainwater collection and utilization.
[0006] To achieve the above objectives, the present invention adopts the following technical solution:
[0007] An embodiment of this utility model provides a rainwater harvesting and utilization system for urban building roofs, including a downpipe. The top end of the downpipe extends to the building roof, and the bottom end extends to the ground and is connected to a rainwater collection pipe for burying underground and distributed along the perimeter of the building via a rainwater collection pipe. The rainwater collection pipe is connected to a diversion device via a connecting pipe. The diversion device is connected to one end of a diversion pipe, and the other end of the diversion pipe is connected to a sedimentation tank for burying underground. The sedimentation tank is connected to one end of a drainage pipe at a set height, and the other end of the drainage pipe is connected to an underground rainwater collection tank for burying below the ground level of the community green space. A submersible pump is installed in the underground rainwater collection tank, and the submersible pump is connected to one end of an outlet pipe, the other end of which extends above the ground.
[0008] Optionally, the sedimentation tank includes a tank body with an open top extending above the ground. The bottom surface of the tank body is covered with a layer of graded crushed stone, and the open top of the tank body is covered with a grate, the bottom surface of which is equipped with a filter screen.
[0009] Optionally, the pool body is constructed of brick with a cement mortar layer on its inner surface.
[0010] Optionally, the graded crushed stone layer includes a gravel layer, a coarse sand layer, and a medium sand layer laid sequentially from bottom to top, with geotextile between the gravel layer and the coarse sand layer, and between the coarse sand layer and the medium sand layer.
[0011] Optionally, the guide pipe is a straight pipe, the height of the inlet end of the guide pipe is higher than the height of the outlet end, and the slope of the guide pipe is not greater than 1%.
[0012] Optionally, the diversion pipe includes an arc-shaped pipe section and a straight pipe section. The arc-shaped pipe section is convex and bent downwards. One end of the arc-shaped pipe section is connected to the diversion device, and the other end is connected to the straight pipe section. The height of the inlet end of the straight pipe section is higher than the height of the outlet end, and the slope of the straight pipe section is not greater than 1%.
[0013] Optionally, the underground rainwater collection tank adopts a reinforced concrete structure, with a precast cover plate on the top and a concrete paving layer on the bottom. The submersible pump is installed on the upper surface of the concrete paving layer.
[0014] Optionally, the precast cover plate is provided with an inspection port, and an inspection ladder extending to the upper surface of the concrete pavement is provided at the inspection port. The top of the inspection port is used to extend above the ground. A top cover is detachably fixed to the top of the inspection port, and multiple overflow ports are provided on the top cover.
[0015] Optionally, the bottom surface of the precast cover plate is provided with multiple reinforced concrete beams.
[0016] Optionally, the rainwater collection pipe, drainage pipe, drain pipe, and outlet pipe are all made of PVC pipe.
[0017] The beneficial effects of this utility model are as follows:
[0018] 1. The roof rainwater harvesting and utilization system of this utility model is equipped with a diversion device and a sedimentation tank. The diversion device performs primary filtration on the rainwater collected by the rainwater collection pipe, and the sedimentation tank performs secondary filtration on the rainwater. The clean rainwater after filtration enters the underground rainwater collection tank, which can be pumped out by a submersible pump for irrigation of green spaces or washing of roads. Since the rainwater has undergone two-stage filtration, it meets the needs of plant irrigation and road washing. When irrigating plants, it will not harm the growth of plants. When washing roads, it will not discharge impurities and dirt onto the road surface, ensuring the cleaning effect of the road surface.
[0019] 2. The roof rainwater harvesting and utilization system of this utility model can be installed underground, including rainwater collection pipes, sedimentation tanks, and rainwater collection pools, without occupying above-ground space. This meets the needs of densely packed buildings and limited space in urban communities, and improves the adaptability of rainwater harvesting and utilization on the roofs of urban communities.
[0020] 3. The roof rainwater collection and utilization system of this utility model has an arc-shaped section in the guide pipe and the slope of the straight pipe section is no more than 1%, which plays a role in slowing down the flow when the water volume is large, thus ensuring the settling effect of the sedimentation tank.
[0021] 4. The roof rainwater harvesting and utilization system of this utility model has an inspection port on the top cover, a top cover on the top of the inspection port, and an overflow port on the top cover. While facilitating maintenance by staff, it can also drain rainwater through the overflow port for irrigation of green areas in the event of a submersible pump failure. Attached Figure Description
[0022] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute a limitation thereof.
[0023] Figure 1 This is a front view of the overall structure of Embodiment 1 of this utility model;
[0024] Figure 2 This is a top view of the overall structure of Embodiment 1 of this utility model;
[0025] Figure 3 This is a schematic diagram of the flow guide tube structure of this utility model;
[0026] Among them, 1. rainwater collection pipe, 2. diversion device, 3. diversion pipe, 4. sedimentation tank, 5. graded crushed stone layer, 6. ductile iron grate, 7. drainage pipe, 8. underground rainwater collection tank, 9. precast cover plate, 10. reinforced concrete beam, 11. concrete paving base layer, 12. submersible pump, 13. outlet pipe, 14. inspection port, 15. overflow port, 16. maintenance ladder;
[0027] 3-1. Curved pipe section; 3-2. Straight pipe section. Detailed Implementation
[0028] Example 1
[0029] This embodiment provides a rainwater harvesting and utilization system for urban building roofs, such as... Figures 1-2 As shown, it includes downpipes, which are downpipes installed in urban buildings. The top of the downpipe extends to the roof of the building, and the bottom extends to the ground. The downpipes can be made using existing technology, and will not be described in detail here.
[0030] The bottom end of the downpipe is connected to one end of the rainwater collection pipe, and the other end of the rainwater collection pipe is connected to the rainwater collection pipe 1, which is buried underground. The rainwater collection pipe 1 is buried underground and is distributed around the perimeter of the building. The rainwater collection pipe 1 is arranged around the perimeter of the building, which can collect all the rainwater discharged from the building's downpipe.
[0031] Preferably, both the rainwater collection pipe and the rainwater collection pipe 1 are made of DN100 PVC pipe.
[0032] The rainwater collection pipe 1 is connected to the inlet of the diversion device 2, which is buried below the ground at a set location, through a connecting pipe. The diversion device 2 can be an existing device used for primary filtration of rainwater. Its specific structure will not be described in detail here.
[0033] Preferably, the connecting pipe is also a DN100 PVC pipe.
[0034] The outlet of the diversion device 2 is connected to the inlet of the guide pipe 3, and the outlet of the guide pipe 3 is connected to the inlet of the sedimentation tank 4, which is buried underground.
[0035] Preferably, the guide pipe 3 is a DN150 PVC pipe.
[0036] The sedimentation tank 4 includes a tank body with a length of 0.4m, a width of 0.4m, and a depth of 0.6m. The tank body is constructed of brick, with a 12cm back wall. The inner surface is covered with a cement mortar layer to prevent seepage. The bottom surface of the tank body is provided with a graded crushed stone layer 5. Preferably, the thickness of the graded crushed stone layer 5 is 150mm. The graded crushed stone layer 5 includes a gravel layer, a coarse sand layer, and a medium sand layer laid sequentially from bottom to top. Geotextile is laid between the gravel layer and the coarse sand layer, and between the coarse sand layer and the medium sand layer. The particle size range and laying thickness of the gravel layer, coarse sand layer, and medium sand layer can be set according to actual needs and will not be described in detail here.
[0037] The top of the pool is open and extends to the ground. The open top of the pool is covered with a rain grate. Preferably, the rain grate is made of ductile iron 6, with a length of 0.4m, a width of 0.4m, and a thickness of 0.05m. A filter screen is installed on the bottom surface of the rain grate to intercept some of the dirt. The filter screen mainly serves to intercept floating objects.
[0038] The diversion pipe 3 connects the diversion device 2 and the sedimentation tank 4.
[0039] Furthermore, in order to achieve the best sedimentation effect in the sedimentation tank 4, the water flow should be slowed down as much as possible before entering the sedimentation tank 4. Therefore, the arrangement of the guide pipe 3 should take into account the issue of slow flow.
[0040] Therefore, in one embodiment of this invention, the guide pipe 3 is a straight pipe, with its inlet end height higher than its outlet end height, and the slope of the guide pipe is no greater than 1%. The inlet end of the guide pipe 3 is connected to the diversion device 2, and its outlet end is connected to the inlet of the sedimentation tank 4.
[0041] In another implementation, such as Figure 3 As shown, the guide pipe 3 includes an arc-shaped pipe section 3-1 and a straight pipe section 3-2. One end of the arc-shaped pipe section 3-1 is connected to the diversion device 2, and the other end is connected to the straight pipe section 3-2. The straight pipe section 3-2 is connected to the inlet of the sedimentation tank 4. The arc-shaped pipe section 3-1 bulges downwards, which acts as a buffer for the water flow and further slows down the flow. The inlet end of the straight pipe section is higher than the outlet end, and the slope of the straight pipe section is no more than 1%.
[0042] The sedimentation tank 4 has a wall on one side connected to the guide pipe 3, and an outlet on the other side of the tank wall. In this embodiment, the outlet is located 0.3 meters above the bottom of the tank. The outlet is connected to the inlet of the drainage pipe 7, and the outlet of the drainage pipe is connected to the underground rainwater collection tank 8, which is buried under the green space of the community.
[0043] Preferably, the drain pipe 7 is a DN100 PVC pipe, and the height of the inlet end of the drain pipe 7 is higher than the height of the outlet end.
[0044] In this embodiment, the underground rainwater collection pool 8 is 7.0m long, 6.5m wide, and 1.5m deep. The pool wall of the underground rainwater collection pool 8 is made of reinforced concrete with a thickness of 0.4m. The top of the underground rainwater collection pool 8 is covered with a 15cm thick precast cover plate 9. The precast cover plate 9 is a reinforced concrete cover plate. The bottom surface of the precast cover plate 9 is provided with multiple reinforced concrete beams 10. The reinforced concrete beams 10 are integrally cast with the precast cover plate 9. The reinforced concrete beams 10 are set along the width direction of the underground rainwater collection pool 8. The stability of the precast cover plate 9 is improved by the reinforced concrete beams 10.
[0045] Preferably, the cross-sectional dimensions of the reinforced concrete beam are 40cm x 40cm.
[0046] The bottom surface of the underground rainwater collection tank 8 is covered with a concrete base layer 11, which is made of concrete. Preferably, the thickness of the concrete base layer 11 is 100mm.
[0047] A submersible pump 12 is installed on the concrete paving base 11. The submersible pump 12 is connected to one end of the water outlet pipe 13, and the other end of the water outlet pipe 13 extends above the ground. The water outlet pipe 13 can be connected to the irrigation pipeline of the green space to irrigate the green plants. It can also be connected to the flushing pipeline to clean the roads in the community, thereby realizing the utilization of rainwater resources.
[0048] Preferably, the water outlet pipe 13 is a DN100 PVC pipe.
[0049] To ensure that rainwater in the underground rainwater collection tank can still be used for irrigation of green spaces even in the event of a submersible pump 12 failure, and to facilitate access for maintenance of the submersible pump or other equipment, an inspection port 14 is provided on the prefabricated cover plate. The top surface of the inspection port 14 extends to the ground, and the inspection port 14 is 500mm long and 500mm wide. A top cover made of ductile iron is provided at the top opening of the inspection port 14. The top cover is detachably connected to the top surface of the inspection port by bolts. The top cover has multiple overflow ports 15. When there is too much rainwater collected in the underground rainwater collection tank and it cannot be discharged by the submersible pump 12, the rainwater can overflow through the overflow ports 15 to irrigate the green spaces.
[0050] The inspection port 14 is fixedly connected to the top of the inspection ladder 16, and the bottom of the inspection ladder 16 extends to the upper surface of the concrete base 11. The inspection ladder 16 facilitates workers' access to the interior of the underground rainwater collection tank 8.
[0051] In this embodiment, the urban building roof rainwater harvesting and utilization system uses downpipes to guide rainwater from the building roof through rainwater collection pipes to rainwater collection pipe 1. Rainwater collection pipe 1 sends the rainwater to diversion device 2 for primary filtration. Diversion device 2 sends the filtered rainwater through diversion pipe 3 to sedimentation tank 4 for sedimentation. The clean rainwater after sedimentation enters underground rainwater collection tank 8 through drainage pipe 7 for storage and collection. Submersible pump 12 operates to discharge the rainwater in the underground rainwater collection tank to the ground through drainage pipe 13 for use in irrigating green spaces or washing roads.
[0052] Because the rainwater undergoes two-stage filtration, it meets the needs of plant irrigation and road washing. When irrigating plants, it will not harm their growth. When washing roads, it will not discharge impurities and dirt onto the road surface, ensuring the cleaning effect of the road surface. Moreover, the rainwater collection pipe 1, sedimentation tank 4, and rainwater collection pool 8 can all be installed underground, without occupying above-ground space. This meets the needs of urban residential areas with relatively compact building layouts and limited space, and improves the adaptability of rainwater collection and utilization on the roofs of urban residential buildings.
[0053] In a practical application example of this embodiment:
[0054] Based on the specifications of the buildings and roofs in this area, the following work needs to be completed to install one rainwater harvesting and utilization system of this embodiment on plot A:
[0055] 12m of DN100 PVC rainwater collection pipe (1.5m long x 8 sections); 170m of DN100 PVC rainwater collection pipe (encircling the building); 62.7m of excavation work for the rainwater collection pipe. 3170m of DN100 PVC rainwater collection pipe was laid, and 54.5m of soil was backfilled. 3 Lay out DN150 diversion pipes 1-3m (average 2.0m); construct one sedimentation basin, requiring 0.30m of earthwork excavation. 3 0.16m of bricklaying 3 Cement mortar plastering 1.2m², graded crushed stone layer 0.03m² 3 One ductile iron storm drain grate, 2-4m of DN100 drainage pipe (average 3.0m); construction of one underground rainwater collection tank, requiring 125.3m³ of earthwork excavation. 3 17.1m³ of backfill soil 3 40.0m of reinforced concrete is required. 3 An 8.5m prefabricated cover plate is required. 3 4.6m concrete base 3 One submersible pump and 2.5m of DN100 PVC outlet pipe.
[0056] In summary, a single rainwater harvesting project requires 187.5m of DN100 PVC pipe and 188.3m of excavated earthwork. 3 71.6m³ of backfill earth 3 2.0m of DN150 PVC pipe, 0.16m of brickwork. 3 Cement mortar plastering 1.2m 2 0.03m of sand and gravel cushion layer 3 One ductile iron grate, 40.0m² reinforced concrete. 3 8.5m precast concrete cover slab 3 4.6m concrete base 3 1 submersible pump.
[0057] The calculation for this plot of land, based on the installation of one rainwater harvesting and utilization system for one building, requires 750.0m of DN100 PVC pipe and 753.2m of excavation. 3 286.4 m³ of backfill earth was carried out. 3 8.0m of DN150 PVC pipe and 0.64m of brickwork. 3 Cement mortar plastering 4.8m 2 0.12m of sand and gravel cushion layer 3 Four ductile iron rain gutters, 160.0 m² of reinforced concrete. 3 34.0m precast cover plate 3 18.4m of concrete base 3 4 submersible pumps.
[0058] The rainwater harvesting and utilization system of this embodiment allows the collected rainwater to be directly used for greening or road washing, which saves water resources, reduces surface runoff, improves the community environment, and reduces the waste of rainwater resources.
[0059] Although the specific embodiments of the present utility model have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present utility model. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solution of the present utility model are still within the scope of protection of the present utility model.
Claims
1. A rainwater harvesting system for urban building roof, comprising a downspout, the top end of which extends to the building roof, characterized in that, The bottom end of the downspout extends to the ground and is connected to a rainwater collection pipe for being buried below the ground and distributed along the periphery of the building, the rainwater collection pipe is connected to a flow rejection device through a connecting pipe, the flow rejection device is connected to one end of a guide pipe, the other end of the guide pipe is connected to a sand trap for being buried below the ground, the sand trap is connected to one end of a drain pipe at a set height, the other end of the drain pipe is connected to an underground rainwater collection tank for being buried below the ground of the community green land, a submersible pump is arranged in the underground rainwater collection tank, one end of the submersible pump is connected to a water outlet pipe, and the other end of the water outlet pipe extends above the ground.
2. A rainwater harvesting system for urban building roofs as claimed in claim 1, wherein, The sand trap comprises a tank body, the top of the tank body is open and extends above the ground, the bottom surface of the tank body is paved with a graded gravel layer, and the open top of the tank body is covered with a rainwater grate, the bottom surface of the rainwater grate is provided with a filter screen.
3. A rainwater harvesting system for urban building roofs as claimed in claim 2, wherein, The tank body is made of brick masonry structure, and a cement mortar layer is arranged on the inner surface of the tank body.
4. The urban building roof rainwater harvesting utilization system according to claim 2, characterized in that, The graded gravel layer comprises a gravel layer, a coarse sand layer and a medium sand layer which are sequentially paved from bottom to top, geotextile is arranged between the gravel layer and the coarse sand layer, and geotextile is arranged between the coarse sand layer and the medium sand layer.
5. The urban building roof rainwater harvesting utilization system according to claim 1, characterized in that, The guide pipe is a straight pipe, the height of the water inlet end of the guide pipe is higher than the height of the water outlet end, and the slope of the guide pipe is not greater than 1%.
6. The urban building roof rainwater harvesting utilization system according to claim 1, characterized in that, The guide pipe comprises an arc-shaped pipe section and a straight pipe section, the arc-shaped pipe section is curved downward and protrudes upward, one end of the arc-shaped pipe section is connected to the flow rejection device, the other end of the arc-shaped pipe section is connected to the straight pipe section, the height of the water inlet end of the straight pipe section is higher than the height of the water outlet end, and the slope of the straight pipe section is not greater than 1%.
7. A rainwater harvesting system for urban building roofs as claimed in claim 1, wherein, The underground rainwater collection tank is made of reinforced concrete structure, the top of the underground rainwater collection tank is provided with a prefabricated cover plate, the bottom surface of the prefabricated cover plate is provided with a concrete bottom layer, and the submersible pump is installed on the upper surface of the concrete bottom layer.
8. A rainwater harvesting system for urban building roofs as claimed in claim 7, wherein, An inspection hole is arranged on the prefabricated cover plate, an inspection ladder extending to the upper surface of the concrete bottom layer is arranged at the inspection hole, the top end of the inspection hole is used for extending above the ground, a top cover is detachably fixed to the top of the inspection hole, and a plurality of overflow openings are arranged on the top cover.
9. A rainwater harvesting system for urban building roofs as claimed in claim 7, wherein, A plurality of reinforced concrete beams are arranged on the bottom surface of the prefabricated cover plate.
10. The urban building roof rainwater harvesting utilization system according to claim 1, characterized in that, The rainwater collection pipe, the collecting pipe, the guide pipe, the drain pipe and the water outlet pipe are all made of PVC pipes.