PP module combined rainwater storage tank and construction method thereof

Abstract

The application provides a PP module combined rainwater storage tank and a construction method thereof, the main body of the storage tank is assembled by a mortise and tenon joint mode of a PP module and a matched side plate, is wrapped with a composite film at the periphery, is provided with a protection plate at the top and the side wall, is provided with a bottom plate at the bottom, is provided with a pressure top at the top, is provided with a lifting well inside, is provided with a rainwater emptying pump, a liquid level meter and a drain pipe matched in the lifting well, and water is lifted to a downstream rainwater well when the liquid level in the storage tank is too high; the lifting well is connected with a sewage filtering well and a shunt well in sequence through a water inlet pipe. The application can effectively alleviate the problems such as large transmission pressure of municipal pipe network caused by rainwater flood peak, realize temporary storage and recycling of rainwater, and avoid the shortcomings of long construction time, high cost and great external influence of traditional reinforced concrete rainwater storage tank, and is especially suitable for green projects pursuing the concept of'sponge city'.

Description

Technical Field

[0001] This invention belongs to the field of building construction technology, and in particular relates to a PP module combined rainwater storage tank and its construction method. Background Technology

[0002] In recent years, under the dual impact of rapid urbanization and severe global climate change, green construction management requirements based on the "sponge city" concept have gained increasing attention. The design, construction, and subsequent operation and maintenance of rainwater and drainage systems are core components of green construction, and their importance is self-evident. Rainwater storage tanks, as the central hub for rainwater collection, storage, and discharge, directly influence the full realization of building functions and even the overall ecological environment of the city. However, traditional reinforced concrete rainwater storage tanks involve time-consuming and costly processes such as rebar tying, formwork erection, concrete pouring, and support structure construction, and are significantly affected by weather and temperature conditions, exhibiting considerable drawbacks. Therefore, finding a rainwater storage tank and its construction method that aligns with green construction trends and can be constructed efficiently is particularly important. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a PP module combined rainwater storage tank and its construction method, which can be constructed efficiently and is environmentally friendly. It can effectively alleviate the problems such as the high pressure on municipal pipe network transmission caused by rainwater peaks, and realize the temporary storage and recycling of rainwater. At the same time, it can avoid the disadvantages of traditional reinforced concrete rainwater storage tanks, such as long construction time, high cost, and great susceptibility to external influences. It is especially suitable for green projects that pursue the concept of "sponge city".

[0004] The present invention achieves the above-mentioned technical objectives through the following technical means.

[0005] A PP module combined rainwater storage tank includes a storage tank body formed by splicing PP modules and side panels. The storage tank body is wrapped with a composite membrane, and a reinforced concrete base slab is set at the bottom. Protective plates are set on the four side walls and the top, and a layer of reinforced concrete capping is also set on the top protective plate. A lift well is set inside the storage tank body. The lift well is equipped with a rainwater drain pump and a level gauge. The rainwater drain pump is connected to a drainage pipe, and the other end of the drainage pipe is connected to a downstream rainwater well. The rainwater drain pump and the level gauge are both connected to the system control cabinet. The lift well is also connected to an inlet pipe, and the other end of the inlet pipe is connected to a sewage interception filter well and a diversion well in sequence.

[0006] Furthermore, the PP module adopts a self-locking mortise and tenon structure. The size of a single PP module is 1000mm×500mm×250mm. The PP module is used in conjunction with a 500mm×500mm snap-lock side panel to form the main body of the storage tank.

[0007] Furthermore, the composite membrane consists of a single layer with a surface density of 400 g / m². 2 It consists of a 0.4 mm thick HDPE geomembrane and two layers of geotextile, with a single layer density of 150 g / m². 2 .

[0008] Furthermore, the water inlet pipe is a double-walled corrugated pipe with a diameter of 300mm, and the drain pipe is a PVC pipe with a diameter of 50mm.

[0009] Furthermore, the lifting well is made of PE material, and has multiple 10mm diameter plum blossom-shaped holes with a spacing of 150mm in the depth direction of the regulating tank to ensure water pressure balance and smooth water flow inside and outside the lifting well; two rainwater drainage pumps are installed in the lifting well, one for standby and one for use; two level gauges are installed in the lifting well, including an upper level gauge and a lower level gauge, to monitor the liquid level in the regulating tank. When the liquid level exceeds the upper level, the rainwater drainage pump is started to lift and pump out the water, and pumping stops when the liquid level falls below the lower level.

[0010] Furthermore, the intercepting and filtering well is made of PE material, and has a built-in stainless steel basket and filter screen for intercepting larger solid pollutants.

[0011] Furthermore, the reinforced concrete base slab is 200mm thick, formed by double-layer bidirectional reinforcement and C30 concrete pouring, and a 100mm thick plain concrete cushion layer is also provided at the bottom of the reinforced concrete base slab, with the compacted original soil at the bottom of the plain concrete cushion layer.

[0012] Furthermore, the reinforced concrete capping is 200mm thick and is formed by single-layer bidirectional reinforcement and pouring C30 concrete.

[0013] Furthermore, the protective plate is 20mm thick and is pasted onto the four sides of the storage tank body and the top composite membrane.

[0014] A construction method for the above-mentioned PP module combined rainwater storage tank includes the following steps:

[0015] First, carry out the construction of the supporting rainwater pipe network for outdoor projects to ensure the completion of the construction of diversion wells, downstream rainwater wells and related connecting rainwater pipes, so as to meet the prerequisites for the smooth collection and drainage of rainwater from the roof and ground.

[0016] Secondly, the foundation pit is excavated. The slope of the foundation pit is set at 1:1. According to the size of the storage tank, the four sides are extended outward by 500mm to construct a 100mm thick plain concrete cushion layer and a 200mm thick reinforced concrete base slab. In addition, the perimeter of the crushed stone cushion layer and the reinforced concrete base slab are extended outward by 1000mm to form the slope bottom of the foundation pit. A 1000mm wide passage serves as the construction platform. A temporary water collection pit is set at each of the four corners of the construction platform for temporary water storage and pumping during construction.

[0017] After the reinforced concrete base slab reaches the design strength, the composite membrane is laid and the inlet and outlet wells and lifting wells are positioned. The layout of the inlet and outlet pipes is determined in advance.

[0018] Then, the PP modules and side panels are assembled. At the same time, the construction of the lifting well and the assembly of the PP modules are carried out simultaneously. Two sets of rainwater drainage pumps are placed in the lifting well, and two level gauges are installed at the top and bottom. Then, the four side walls and the top of the storage tank are sealed and wrapped with composite membrane. After the wrapping is completed, protective plates are pasted and laid on the four side walls and the top of the storage tank. Then, the reinforced concrete capping is poured.

[0019] Then, the inlet pipe and the intercepting and filtering well itself are constructed; subsequently, the earthwork for the foundation pit around and above the storage tank is backfilled; the backfilling starts from the top and then proceeds symmetrically around the perimeter to prevent the PP modules from shifting; when the earthwork above the storage tank is backfilled to the design height, the drainage pipe is laid in between, with both ends of the drainage pipe connected to the rainwater drainage pump and the downstream rainwater well; finally, the system control cabinet is installed and debugged in the nearby green space or building.

[0020] The present invention has the following beneficial effects:

[0021] This invention can effectively alleviate the problems of high pressure on municipal pipe networks caused by rainwater peaks, and realize the temporary storage and recycling of rainwater. At the same time, it can avoid the disadvantages of traditional reinforced concrete rainwater storage tanks, such as long construction time, high cost, and great susceptibility to external influences. It is especially suitable for green projects that pursue the concept of "sponge city" and has a certain positive significance for increasing the ecological function of the city. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of a single PP module.

[0023] Figure 2 This is an isometric view of a single PP module;

[0024] Figure 3 This is a schematic diagram of the PP module assembly.

[0025] Figure 4 This is an isometric view of the side panel;

[0026] Figure 5 This is a schematic diagram showing the splicing of the PP module and the side panel;

[0027] Figure 6 A schematic diagram of the layout of a rainwater storage tank composed of PP modules;

[0028] Figure 7 A schematic diagram of the cross-sectional layout of a PP module combined rainwater storage tank;

[0029] Figure 8 This is a schematic diagram of the foundation pit excavation plan;

[0030] Figure 9 This is a schematic diagram of the cross-section of the foundation pit excavation.

[0031] Figure 10 for Figure 7 Detailed diagram of the middle node;

[0032] Figure 11 for Figure 7 Detailed diagram of the middle node 2;

[0033] Figure 12 for Figure 7 Detailed diagram of the middle node;

[0034] In the diagram: 1- PP module; 2- Composite membrane; 3- Inlet pipe; 4- Drainage pipe; 5- Rainwater drain pump; 6- Diversion well; 7- Intercepting filter well; 8- Lifting well; 9- Downstream rainwater well; 10- Reinforced concrete base slab; 11- Reinforced concrete capping; 12- Protective plate; 13- Level gauge; 14- System control cabinet; 15- Manhole cover; 16- Manhole base; 17- Side plate; 18- Sump. Detailed Implementation

[0035] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but the scope of protection of the present invention is not limited thereto.

[0036] like Figures 1 to 12 As shown, the PP module combined rainwater storage tank of the present invention includes a PP module 1, a composite membrane 2, an inlet pipe 3, a drain pipe 4, a rainwater drainage pump 5, a diversion well 6, a sewage interception and filtration well 7, a lift well 8, a downstream rainwater well 9, a reinforced concrete base slab 10, a reinforced concrete capping 11, a protective plate 12, a level gauge 13, and a supporting system control cabinet 14.

[0037] like Figure 1 , 2 As shown in Figure 3, PP module 1 adopts a self-locking mortise and tenon structure. The dimensions of a single PP module 1 are 1000 mm × 500 mm × 250 mm, and it can be assembled on-site during actual construction. PP module 1 and... Figure 4The snap-on side panel 17 shown has a planar dimension of 500mm × 500mm and is used in conjunction with it. Figure 5 As shown, the components are assembled to form the main body of the stormwater storage tank. PP module 1 and snap-on side panel 17 are the structure and core components of the stormwater storage tank based on the "sponge city" design concept.

[0038] like Figure 6 , 7 As shown in Figure 11, the inlet pipe 3 is a double-walled corrugated pipe with a diameter of 300mm, which is used in the connection sections of the diversion well 6-intercepting filter well 7 and intercepting filter well 7-regulating tank to ensure that rainwater from the roof and ground flows smoothly into the regulating tank.

[0039] like Figure 6 , 7 As shown, the drainage pipe 4 is a PVC pipe with a diameter of 50mm. One end is located in the lifting well 8 and is used in conjunction with the rainwater drainage pump 5. The other end extends into the downstream rainwater well 9 and is used to discharge water to the downstream rainwater well 9 when the liquid level in the storage tank is too high.

[0040] like Figure 6 , 7 As shown, the lift well 8 is made of PE material, with a diameter of 630mm, and is installed in the regulating tank. The lift well 8 has multiple 10mm diameter, quincunx-shaped holes spaced 150mm apart along the depth of the regulating tank to ensure pressure balance and smooth water flow inside and outside the lift well 8. A rainwater drain pump 5 is installed inside the lift well 8, with one pump for backup. The rainwater drain pump 5 works in conjunction with the drain pipe 4 to lift water when the liquid level in the regulating tank is too high, and discharge it through the drain pipe 4 to the downstream rainwater well 9. The top of the lift well 8 extends to the ground and is equipped with a well cover 15 and a well base 16.

[0041] like Figure 6 , 7 As shown, the diversion well 6 is constructed according to the outdoor engineering design technical parameters and is set at the front end of the regulating reservoir to play a role in the rational allocation and diversion of rainwater.

[0042] like Figure 6 , 7 As shown in Figure 12, the intercepting and filtering well 7 is made of PE material and has a diameter of 630mm. Rainwater is diverted by the diversion well 6 and then enters the intercepting and filtering well 7 through the inlet pipe 3. The intercepting and filtering well 7 has a built-in stainless steel 304 basket and filter screen, which can effectively intercept larger solid pollutants, thereby protecting the normal operation of the equipment later. After intercepting the large solid pollutants, the rainwater further enters the lifting well 8 through the inlet pipe 3, and then is discharged into the regulating tank. The top of the intercepting and filtering well 7 extends to the ground and is equipped with a well cover 15 and a well base 16.

[0043] like Figure 6 , 7As shown, the downstream rainwater well 9 is constructed according to the outdoor engineering design technical parameters, and the rainwater pump 5 lifts and discharges the rainwater into the municipal rainwater pipe network.

[0044] like Figure 6 , 7 As shown in Figures 8, 9, and 10, the reinforced concrete base slab 10 has a thickness of 200mm and adopts... The 12@200 double-layer bidirectional reinforcement (referring to the use of 12mm diameter steel bars spaced 200mm in double layers to form a grid structure) is formed by pouring C30 concrete and is placed at the bottom of the storage tank to provide a flat and solid load-bearing support for the storage tank. A 100mm thick plain concrete pad is also provided at the bottom of the reinforced concrete base slab 10, with compacted original soil at the bottom of the plain concrete pad.

[0045] like Figure 7 , 9 As shown, the reinforced concrete coping 11 is 200mm thick and uses... The 12@200 single-layer bidirectional reinforced concrete is cast with C30 concrete and installed on the top of the storage tank as an anti-buoyancy measure and also as an isolation and protection layer between the storage tank and the upper soil cover.

[0046] like Figure 7 , 9 As shown in Figures 10 and 11, the protective plate 12 is 20mm thick and is pasted on the outer perimeter of the storage tank and the top composite membrane 2. It serves to isolate and protect the PP module 1 from external soil compression, damage, and pollution.

[0047] like Figure 7 As shown, the level gauge 13 includes an upper level gauge and a lower level gauge, which are installed in the lift well 8 to monitor the liquid level in the storage tank. When the liquid level exceeds the upper level, the liquid is lifted and pumped out; when the liquid level is below the lower level, the pumping is stopped.

[0048] like Figure 10 , 11 As shown, composite membrane 2 consists of a single layer with a surface density of 400 g / m³. 2 0.4 mm thick HDPE geomembrane and two layers of geotextile (single layer density is 150 g / m²) 2 It consists of PP module 1 and snap-on side plate 17, which surround the main body of the storage tank. It not only isolates the storage tank from the external soil, but also ensures the integrity and stability of the entire storage tank.

[0049] like Figure 6 , 7As shown, the system control cabinet 14 is a rainproof electrical control cabinet, which meets the requirements of both manual and automatic control. The rainproof electrical control cabinet is set according to the project requirements and installed according to the site conditions. It is used in conjunction with waterproof cables to control the operation of the rainwater drainage pump 5 and ensure the stable operation of the storage tank.

[0050] In actual operation, rainwater from the roof and ground is first diverted through the municipal rainwater diversion well 6 into the interception device (i.e., interception and filtration well 7), where larger debris such as leaves and plastic bags can be intercepted. Then, the rainwater enters the lifting well 8, which can discharge 70% to 80% of the pollutants from the initial rainfall, effectively controlling the pollutants in the rainwater entering the storage tank. After the rainwater enters the regulating tank, it can be lifted and emptied when needed.

[0051] The construction method of the PP module combined rainwater storage tank of the present invention includes the following process:

[0052] First, carry out the construction of the supporting rainwater pipe network for the outdoor project, and ensure the completion of the construction of the diversion well 6 (rainwater well Y1), the downstream rainwater well 9 (rainwater well Y2) and related connecting rainwater pipes to meet the prerequisite requirements for smooth collection and drainage of rainwater from the roof and ground.

[0053] Secondly, excavation of the foundation pit is carried out; such as Figure 8 , 9 As shown, the slope of the excavation pit is set at 1:1. Based on the size of the PP module combined rainwater storage tank, a 100mm plain concrete cushion layer and a 200mm reinforced concrete base slab 10 are constructed by extending 500mm outward on all four sides (i.e., the plain concrete cushion layer and the reinforced concrete base slab 10 extend 500mm beyond the storage tank on all four sides). In addition, for the convenience of construction, the slope bottom of the excavation pit is extended 1000mm outward on all four sides of the plain concrete cushion layer and the reinforced concrete base slab 10 (i.e., the dimensions of the slope bottom of the pit extend 1000mm beyond the plain concrete cushion layer and the reinforced concrete base slab 10 on all four sides). A 1000mm wide passage serves as a construction platform, and a temporary sump pit 18 is set at each of the four corners of the construction platform for temporary water storage and pumping during construction.

[0054] After the reinforced concrete base slab 10 reaches its design strength, a 700 g / m² pressure is applied. 2 The work includes laying the composite membrane 2 and positioning the inlet / outlet wells and lift well 8, and pre-determining the routes for the inlet pipe 3 and outlet pipe 4; among which, 700 g / m 2 Composite membrane 2 consists of a single layer with a surface density of 400 g / m³ 2 0.4 mm thick HDPE geomembrane with a single layer density of 150 g / m 2 Composed of two layers of geotextile, it can isolate the entire storage tank from the external soil, preventing water from seeping out of the storage tank and pollutants from the soil from seeping into the storage tank and causing pollution, while ensuring the integrity and stability of the entire storage tank.

[0055] Then, the PP module assembly 1 and reinforced concrete capping 11 were poured. According to the layout of PP modules 1 in the detailed design drawings, each PP module 1 was installed individually. Each PP module 1 measures 1000 mm × 500 mm × 250 mm. The upper and lower layers were connected by mortise and tenon joints using self-adhesive clips. For the outermost part of the entire stormwater storage tank PP module 1, a 500 mm × 500 mm self-adhesive clip-on side plate 17 was used to connect to the upper and lower layers of PP modules 1 via mortise and tenon joints, forming a complete and enclosed PP module combined stormwater storage tank. After the PP modules 1 and side plates 17 were installed, 700 g / m³ of concrete was used... 2 The composite membrane 2 encloses and wraps the four side walls and top of the storage tank. After the composite membrane 2 is wrapped, a 20mm thick protective plate 12 is pasted and laid on the four side walls and top of the storage tank as a protective layer for the subsequent backfilling of the side foundation pit and the top reinforced concrete capping 11.

[0056] Next, based on the specific locations of the previously identified inlet and outlet wells and lift well 8, the construction of the diversion well 6, intercepting and filtering well 7, and the inlet pipe 3 of the storage tank is carried out. It is important to note that the construction of lift well 8 must be carried out simultaneously with the assembly of PP module 1. Two sets of rainwater drain pumps 5 (one in use and one as a backup) are placed inside lift well 8 to pump out the rainwater stored in the storage tank. Simultaneously, two level gauges 13 are installed inside lift well 8. When the rainwater level in the storage tank exceeds the upper level, the rainwater drain pump 5 pumps out the rainwater; when the rainwater level in the storage tank drops below the lower level, pumping stops.

[0057] Subsequently, backfilling of the foundation pit around and above the stormwater storage tank was carried out. Backfilling began from the top and proceeded symmetrically around the perimeter to prevent displacement of the PP module 1. The backfill soil was compacted to a compaction coefficient of 0.95 to ensure that the area around the module was filled and to ensure uniform stress on the fixed position of the module. When the backfill soil above the stormwater storage tank reached the design height, the drainage pipe 4 was laid, with both ends of the drainage pipe 4 connected to the stormwater drainage pump 5 and the downstream stormwater well 9, respectively. When the inspection well on the stormwater drainage pipe was located on the road surface, the manhole cover and frame were both made of heavy-duty ductile iron single-layer manhole frame 16 and manhole cover 15.

[0058] Finally, the system control cabinet 14 is installed nearby in the greenery or within a building, and is a rainproof electrical control cabinet. After installation, timely commissioning is performed. Once commissioning is complete, the PP module combined rainwater storage tank can collect, store, and pump rainwater after rainfall.

[0059] The embodiments described above are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments. Any obvious improvements, substitutions or modifications that can be made by those skilled in the art without departing from the essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A PP module combined rainwater storage tank, characterized in that, The main body of the storage tank is formed by splicing PP modules (1) and side plates (17). The main body of the storage tank is wrapped with a composite membrane (2), and a reinforced concrete base plate (10) is set at the bottom. Protective plates (12) are set on the four side walls and the top. A layer of reinforced concrete capping (11) is also set on the top protective plate (12). The main body of the storage tank is equipped with a lifting well (8). The lifting well (8) is equipped with a rainwater drain pump (5) and a level gauge (13). The rainwater drain pump (5) is connected to the drainage pipe (4). The other end of the drainage pipe (4) is connected to the downstream rainwater well (9). The rainwater drain pump (5) and the level gauge (13) are both connected to the system control cabinet (14). The lifting well (8) is also connected to the inlet pipe (3). The other end of the inlet pipe (3) is connected to the intercepting filter well (7) and the diversion well (6) in sequence.

2. The PP module combined rainwater storage tank according to claim 1, characterized in that, The PP module (1) and the side plate (17) are combined by mortise and tenon splicing to form the main body of the storage tank.

3. The PP module combined rainwater storage tank according to claim 1, characterized in that, The composite membrane (2) is composed of a single layer with a surface density of 400 g / m³. 2 It consists of a 0.4 mm thick HDPE geomembrane and two layers of geotextile, with a single layer density of 150 g / m². 2 .

4. The PP module combined rainwater storage tank according to claim 1, characterized in that, The water inlet pipe (3) is a double-walled corrugated pipe with a diameter of 300mm, and the drain pipe (4) is a PVC pipe with a diameter of 50mm.

5. The PP module combined rainwater storage tank according to claim 1, characterized in that, The lifting well (8) is made of PE material. Multiple small holes are evenly spaced in the depth direction of the storage tank to ensure water pressure balance and smooth water flow inside and outside the lifting well (8). Two rainwater drainage pumps (5) are installed in the lifting well (8), one for standby and one for use. Two level gauges (13) are installed in the lifting well (8), including an upper level gauge and a lower level gauge, to monitor the liquid level in the storage tank. When the liquid level exceeds the upper level, the rainwater drainage pump (5) is started to lift and pump out the water. When the liquid level is lower than the lower level, the pumping stops.

6. The PP module combined rainwater storage tank according to claim 1, characterized in that, The intercepting filter well (7) is made of PE material and has a built-in stainless steel basket and filter screen for intercepting larger solid pollutants.

7. The PP module combined rainwater storage tank according to claim 1, characterized in that, The reinforced concrete base slab (10) is 200mm thick and is formed by double-layer bidirectional reinforcement and concrete pouring. A plain concrete cushion layer is also provided at the bottom of the reinforced concrete base slab (10), and the bottom of the plain concrete cushion layer is the compacted original soil.

8. The PP module combined rainwater storage tank according to claim 1, characterized in that, The reinforced concrete capping (11) is 200mm thick and is formed by single-layer bidirectional reinforcement and concrete pouring.

9. The PP module combined rainwater storage tank according to claim 1, characterized in that, The protective plate (12) is 20mm thick and is pasted on the four sides of the storage tank body and the top composite membrane (2).

10. A construction method for a PP module combined rainwater storage tank as described in claim 1, characterized in that, The process includes the following: First, carry out the construction of the supporting rainwater pipe network for outdoor engineering, and ensure the completion of the construction of the diversion well (6), the downstream rainwater well (9) and related connecting rainwater pipes to meet the prerequisite requirements for the smooth collection and drainage of rainwater on the roof and ground. Secondly, the foundation pit is excavated; the slope of the foundation pit is set at 1:

1. According to the size of the storage tank, the plain concrete cushion layer and the reinforced concrete base plate (10) are constructed by extending 500mm outward on all four sides; in addition, the plain concrete cushion layer and the reinforced concrete base plate (10) are extended 1000mm outward on all four sides as the bottom of the foundation pit excavation, and this 1000mm wide channel is used as a construction platform. A temporary water collection pit (18) is set at each of the four corners of the construction platform for temporary water storage and pumping during the construction process. After the reinforced concrete base slab (10) reaches the design strength, the composite membrane (2) is laid and the inlet and outlet wells and lifting wells (8) are positioned. The layout routes of the inlet pipe (3) and the outlet pipe (4) are determined in advance. Then, the PP module (1) and side plate (17) are assembled. At the same time, the construction of the lifting well (8) and the assembly of the PP module (1) are carried out simultaneously. Two rainwater drainage pumps (5) are placed in the lifting well (8), and two level gauges (13) are set up at the top and bottom. Then, the composite membrane (2) is used to seal and wrap the four side walls and top of the storage tank body. After the wrapping is completed, the protective plate (12) is pasted and laid on the four side walls and top of the storage tank body. Then, the reinforced concrete capping (11) is poured. Then construct the water inlet pipe (3) and the intercepting and filtering well (7) itself; Then, backfill the soil around and above the storage tank. Backfilling starts from the top and then proceeds symmetrically around the perimeter to prevent displacement of the PP module (1). When the soil above the storage tank is backfilled to the design height, drainage pipe (4) is laid in between. The two ends of the drainage pipe (4) are connected to the rainwater drainage pump (5) and the downstream rainwater well (9), respectively. Finally, the system control cabinet (14) is installed in the nearby greenery or building and debugged.

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