A rain and sewage diversion reconstruction construction method and a diversion reconstruction structure of an old urban municipal drainage system

Abstract

The application discloses a rain and sewage diversion reconstruction construction method and a diversion reconstruction structure of an old urban municipal drainage system, relates to the technical field of old urban reconstruction, and comprises the following steps: digging and arranging on a pipeline of an original municipal drainage system until the original underground drainage tunnel is dug through; installing a supporting structure on the side wall of the original underground drainage tunnel; installing a rainwater pipeline on the supporting structure, planning the arrangement line of the rainwater pipeline, and connecting the rainwater pipeline with a river or an irrigation canal; installing a flow guide structure in a water collecting well of the original municipal drainage system, installing the flow guide structure at a position close to the top of the water collecting well, connecting the flow guide structure with the rainwater pipeline, guiding the ground rainwater into the rainwater pipeline through the flow guide structure after the ground rainwater is collected in the water collecting well, and pouring concrete on the top of the rainwater pipeline to form a concrete layer. The application has the effect of reducing the influence on the ecological environment and normal life of residents when the old urban municipal drainage system is reconstructed.

Description

Technical Field

[0001] This application relates to the technical field of old city renovation, and in particular to a construction method and structure for the rainwater and sewage separation renovation of an old city municipal drainage system. Background Technology

[0002] Traditional drainage systems in old urban areas primarily rely on centralized rainwater and sewage treatment. This involves mixing domestic and industrial wastewater with rainwater through underground drainage culverts and surface collection wells before directly discharging it to sewage treatment plants. This undoubtedly increases the processing pressure on these plants, and excess sewage is discharged directly into surrounding rivers, causing irreversible damage to the surrounding ecosystem and posing a significant risk of urban flooding during the rainy season. To alleviate the pressure on sewage treatment plants, improve urban flood control and drainage capabilities, and optimize the urban ecological environment, a comprehensive redesign of the sewage pipe network in old urban areas is necessary.

[0003] Currently, when replanning the sewage pipe network, it is necessary to demolish old manholes and existing pipes and build new rainwater and sewage pipe networks. This will cause temporary partial paralysis of the original drainage system, and the construction period is long, resulting in a large occupation of urban resources, which in turn affects the ecological environment and the normal life of residents. Summary of the Invention

[0004] In response to the problems existing in the prior art, this application provides a construction method and a diversion and renovation structure for the rainwater and sewage separation of the municipal drainage system in old urban areas, which has the effect of reducing the impact on the ecological environment and the normal life of residents when renovating the municipal drainage system in old urban areas.

[0005] Firstly, this application provides a method for the construction of a rainwater and sewage separation renovation project for an old urban municipal drainage system, comprising the following steps:

[0006] S1. Pipeline excavation: Excavate along the existing municipal drainage system pipelines until the existing underground drainage culvert is cleared.

[0007] S2. Installation of support structure: Install the support structure on the side wall of the existing underground drainage culvert.

[0008] S3. Rainwater pipe installation: Install the rainwater pipes on the support structure, plan the layout of the rainwater pipes, and connect the rainwater pipes to the river or irrigation canal.

[0009] S4. Installation of the diversion structure: Install the diversion structure in the collection well of the existing municipal drainage system. The diversion structure is installed near the top of the collection well and connected to the rainwater pipe. After the surface rainwater is collected in the collection well, it is guided by the diversion structure and enters the rainwater pipe.

[0010] S5. Concrete layer construction: Concrete is poured on top of the rainwater pipes to form a concrete layer, which then buries the rainwater pipes underground.

[0011] By adopting the above-mentioned technical solutions, rainwater pipes are installed on the basis of the existing municipal underground drainage culverts, and a special diversion structure is installed in the existing municipal water collection wells to guide the surface rainwater entering the water collection wells into the rainwater pipes. Then, the rainwater is directly discharged into rivers or irrigation canals through the rainwater pipes. At the same time, the existing underground culverts are retained, and domestic and industrial sewage is transported to sewage treatment plants for centralized treatment through the underground culverts. This effectively alleviates the pressure on sewage treatment plants and improves the city's flood control and drainage functions. By separating rainwater from domestic and industrial sewage, the impact on the ecological environment is greatly reduced. In the process of transforming the municipal drainage system in the old city into a rainwater and sewage separation system, by retaining part of the original municipal drainage system structure, resources can be effectively utilized and the construction period can be greatly shortened. Moreover, because the underground culverts are retained, there is no need to reroute the original domestic and industrial drainage networks, thus greatly reducing the impact on the normal lives of residents.

[0012] Optionally, during the installation of rainwater pipes, seepage pipes are buried in the soil around the rainwater pipes and connected to the rainwater pipes.

[0013] By adopting the above technical solution, some of the rainwater entering the rainwater pipe enters the infiltration pipe, and then flows out through the infiltration pipe and seeps into the surrounding soil layer, thereby maintaining the surrounding soil and vegetation.

[0014] Secondly, this application provides a rainwater and sewage separation renovation structure for an old urban municipal drainage system, employing the following technical solution:

[0015] A rainwater and sewage separation renovation structure for an old urban municipal drainage system, wherein the rainwater pipeline includes a guide pipe, a drainage ditch, and a filter cover. The guide pipe is installed on a support structure, and the seepage pipe is connected to the rainwater pipeline. The drainage ditch is installed on top of the guide pipe and is connected to a collection well. The drainage ditch is connected to a connecting pipe, which is connected to the guide pipe. The filter cover is fastened to the top of the drainage ditch and has several water inlets. A concrete layer is laid on the filter cover and has several seepage holes connected to the water inlets.

[0016] By adopting the above technical solution, as rainwater on the road surface collects into the collection well, some of the rainwater enters the drainage ditch through the seepage holes in the concrete layer and the water outlets on the filter cover. Then, it directly enters the diversion pipe through the connecting pipe, reducing the pressure of the collection well on the drainage of water accumulation on the road surface.

[0017] Optionally, the support structure includes a support frame, which is fixed to the side wall of the existing underground drainage culvert by expansion bolts, and the support frame is provided with a fixing component for fixing the diversion pipe.

[0018] Optionally, the fixing component includes a first sleeve fixedly mounted on the support frame, a second sleeve slidably mounted on the support frame, and a fixing member for preventing the second sleeve from sliding. Both the first sleeve and the second sleeve are provided with a clamping groove adapted to the flow guide pipe.

[0019] Optionally, the flow guiding structure includes a mounting frame fixedly installed in the water collection well and a water inlet bucket fixedly installed on the mounting frame, the top of the water inlet bucket being open, and the flow guiding pipe communicating with the water inlet bucket.

[0020] Optionally, a filter cage is fixedly installed inside the water inlet tank, and the guide pipe extends into the filter cage.

[0021] By adopting the above technical solution, by installing a filter cage in the inlet tank and extending the guide pipe into the filter cage, it is possible to effectively prevent debris or fallen leaves from the road surface from entering the guide pipe and causing blockage of the guide pipe or seepage pipe.

[0022] Optionally, the bottom wall of the water inlet bucket is provided with a discharge port, a pressure cap is slidably disposed inside the water inlet bucket, the pressure cap is used to close the discharge port, and a drive component is provided inside the water inlet bucket to drive the pressure cap to slide.

[0023] By adopting the above technical solution, when the rainfall is too heavy and exceeds the maximum drainage capacity of the diversion pipe, resulting in severe road water accumulation, the drive component drives the pressure cap to slide, opening the discharge port. Water entering the collection well enters the underground drainage culvert through the discharge port and is discharged, which can effectively relieve the drainage pressure of the diversion pipe. At the same time, the discharge port also makes it easy to clean debris or fallen leaves in the water inlet bucket.

[0024] Optionally, the drive assembly includes a transmission screw, a sleeve, and a turntable. The transmission screw is rotatably mounted on the mounting bracket, the sleeve is fixedly mounted on the pressure cap, and the sleeve is slidably engaged with the mounting bracket. The sleeve has an internal thread adapted to the transmission screw, the transmission screw passes through the sleeve and is threadedly engaged with the sleeve, and the turntable is coaxially and fixedly connected to the transmission screw.

[0025] Optionally, a cleaning frame is fixedly mounted on the transmission screw, and a brush plate is fixedly mounted on the cleaning frame. The brush plate is provided with bristles, which abut against the bottom wall inside the water inlet tank.

[0026] By adopting the above technical solution, the transmission screw rotates and slides the pressure cover, opening the discharge port. At the same time, the transmission screw drives the cleaning frame to rotate and flushes water into the water inlet. The brush plate washes the inside of the water inlet, and the debris or fallen leaves in the water inlet enter the underground drainage ditch through the discharge port, making it more convenient to clean the debris or fallen leaves in the water inlet.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. This application involves installing rainwater pipes on the existing municipal underground drainage culverts and installing specialized diversion structures within the existing municipal collection wells. This guides surface rainwater entering the collection wells into the rainwater pipes, which then discharge the rainwater directly into rivers or irrigation canals. Simultaneously, the existing underground culverts are retained to transport domestic and industrial wastewater to wastewater treatment plants for centralized treatment, effectively alleviating pressure on wastewater treatment plants and improving urban flood control and drainage capabilities. Furthermore, the separation of rainwater and domestic / industrial wastewater significantly reduces the impact on the ecological environment. During the rainwater and wastewater separation renovation of the old city's municipal drainage system, retaining a portion of the original municipal drainage system structure allows for effective resource utilization and significantly shortens the construction period. Moreover, the retention of the underground culverts eliminates the need to reroute the existing domestic and industrial drainage networks, further minimizing the impact on residents' daily lives.

[0029] 2. As rainwater on the road surface collects into the collection well, some of it enters the drainage ditch through the seepage holes in the concrete layer and the water outlets on the filter cover. Then, it enters the diversion pipe directly through the connecting pipe, reducing the drainage pressure of the collection well on the road surface.

[0030] 3. When the rainfall is too heavy and exceeds the maximum drainage capacity of the diversion pipe, resulting in severe water accumulation on the road, the pressure cap is slid by the drive component to open the discharge port, which can effectively relieve the drainage pressure of the diversion pipe. At the same time, the discharge port can also facilitate the cleaning of debris or fallen leaves in the water inlet bucket. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application;

[0032] Figure 2 This is a structural cross-sectional view of an embodiment of this application, mainly used to illustrate the structural schematic diagram of the water collection well;

[0033] Figure 3 This is a structural cross-sectional view of an embodiment of this application, mainly used to illustrate the structural schematic diagram of the rainwater pipeline;

[0034] Figure 4yes Figure 3 Enlarged view of section A;

[0035] Figure 5 This is a schematic diagram illustrating the structure of a drainage ditch according to an embodiment of this application;

[0036] Figure 6 This is a schematic diagram illustrating the flow guiding structure in an embodiment of this application.

[0037] Explanation of reference numerals in the attached drawings: 1. Underground drainage culvert; 2. Support structure; 21. Support frame; 211. Waist-shaped groove; 22. First jacket; 23. Second jacket; 231. Sliding sleeve; 24. Fixing element; 3. Rainwater pipe; 31. Diversion pipe; 311. Inlet pipe; 312. Pipe sleeve; 32. Drainage ditch; 321. Connecting pipe; 33. Filter cover plate; 331. Water inlet; 4. Seepage pipe; 5. Collection well; 6. Diversion structure; 61. Mounting frame; 611. Transmission screw; 612. Turntable; 62. Inlet bucket; 621. Filter cage; 622. Material outlet; 623. Pressure cover; 624. Sleeve rod; 625. Fixing frame; 626. Cleaning frame; 627. Brush plate; 7. Concrete layer; 71. Seepage hole. Detailed Implementation

[0038] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0039] This application discloses a construction method for the rainwater and sewage separation renovation of an old urban municipal drainage system. (Refer to...) Figure 1 This includes the following steps:

[0040] S1. Pipeline excavation;

[0041] According to the layout map of the original underground drainage culvert 1 of the old city's municipal drainage system, the ground above the original underground drainage culvert 1 was excavated using equipment such as impact drills and excavators until the original underground drainage culvert 1 was excavated.

[0042] S2, Installation of support structure 2;

[0043] A support structure 2 is installed on the side wall of the existing underground drainage culvert 1, with the support structure 2 installed close to the top of the underground drainage culvert 1.

[0044] S3, Rainwater Pipeline 3 Installation;

[0045] Install the rainwater pipe 3 on the support structure 2 and plan the layout of the rainwater pipe 3. Connect the rainwater pipe 3 to the river or irrigation canal. At the same time, seal the connection between the underground drainage culvert 1 and the surrounding river with concrete.

[0046] When installing rainwater pipe 3, the installation location of infiltration pipe 4 is planned. A pre-embedded trench is dug in the soil layer around rainwater pipe 3, and infiltration pipe 4 is laid in the pre-embedded trench. Infiltration pipe 4 is connected to rainwater pipe 3. Several water outlet holes are opened on the side wall of infiltration pipe 4. After the infiltration pipe 4 is installed, soil is backfilled in the pre-embedded trench to bury infiltration pipe 4. Then, according to the material of the ground structure layer, the corresponding backfill material is set to seal the pre-embedded trench. The burial location of infiltration pipe 4 is generally set in a place with more surrounding vegetation. Some rainwater entering rainwater pipe 3 enters infiltration pipe 4, and then flows out through infiltration pipe 4 and seeps into the surrounding soil layer, thereby maintaining the surrounding soil and vegetation.

[0047] S4, installation of the flow guiding structure 6;

[0048] Reference Figure 1 , 2 A flow guiding structure 6 is installed in the existing municipal drainage system's collection well 5. The flow guiding structure 6 is installed near the top of the collection well 5 and connected to the rainwater pipe 3. After the rainwater on the ground is collected in the collection well 5, it is directly guided through the flow guiding structure 6 and enters the rainwater pipe 3.

[0049] S5, Concrete layer 7 construction;

[0050] Reference Figure 2 After the rainwater pipe 3 is installed, a casting template is erected on top of the rainwater pipe 3. Then, concrete is poured into the casting template to form a concrete layer 7, which seals the underground drainage culvert 1 and buries the rainwater pipe 3 underground.

[0051] The implementation principle of the rainwater and sewage separation renovation method for an old urban municipal drainage system in this application embodiment is as follows: Rainwater pipes 3 are installed on the basis of the existing underground culverts of the municipal drainage system, and a special guide structure 6 is installed in the existing municipal collection well 5 to guide the surface rainwater entering the collection well 5 into the rainwater pipes 3. The rainwater is then directly discharged into rivers or irrigation canals through the rainwater pipes. Simultaneously, the existing underground culverts are retained, and domestic and industrial sewage is transported to sewage treatment plants for centralized treatment, thereby effectively alleviating the pressure on sewage treatment plants and improving the city's flood control and drainage functions. By separating rainwater from domestic and industrial sewage, the impact on the ecological environment is greatly reduced. In the process of rainwater and sewage separation renovation of the old urban municipal drainage system, by retaining a portion of the original municipal drainage system structure, resources are effectively utilized, and the construction period is greatly shortened. Furthermore, due to the retention of the underground culverts, there is no need to reroute the original domestic and industrial drainage networks, thus greatly reducing the impact on residents' normal lives.

[0052] This application also discloses a rainwater and sewage separation renovation structure for an old urban municipal drainage system.

[0053] Reference Figure 1 , 3 A rainwater and sewage separation renovation structure for an old urban municipal drainage system includes a rainwater pipe 3, a support structure 2, and a diversion structure 6. The rainwater pipe 3 includes a diversion pipe 31, a drainage ditch 32, and a filter cover 33, and the drainage ditch 32 is connected to a collection well 5.

[0054] Reference Figure 3 , 4 The side wall of the diversion pipe 31 is connected to multiple inlet pipes 311, and the bottom of the drainage ditch 32 is connected to multiple connecting pipes 321. The connecting pipes 321 correspond one-to-one with the inlet pipes 311. The diversion pipe 31 is fixed on the support structure 2. After the diversion pipe 31 is installed, temporary supports are installed to install the drainage ditch 32 on the top of the diversion pipe 31, and the connecting pipes 321 on the drainage ditch 32 are connected to the corresponding inlet pipes 311. When the connecting pipe 321 is connected to the inlet pipe 311, a sleeve 312 is fitted at the connection end of the connecting pipe 321 and the inlet pipe 311, and waterproof sealant is applied inside the sleeve 312 to seal the gap between the sleeve 312 and the inlet pipe 311 and the connecting pipe 321. The connection between two adjacent drainage ditches 32 is sealed and fixed with concrete.

[0055] Reference Figure 3 , 5 The top wall of the drainage ditch 32 is provided with an installation groove, which is adapted to the filter cover plate 33. The filter cover plate 33 is provided with several water inlets 331. After the drainage outlets are installed, the filter cover plate 33 is fastened into the installation groove at the top of the drainage ditch 32. When the concrete layer 7 is laid, both the drainage ditch 32 and the filter cover plate 33 are buried in the concrete layer 7, and several seepage holes 71 connected to the water inlets 331 are reserved on the concrete layer 7. During the process of rainwater on the road surface collecting into the water collection well 5, some rainwater enters the drainage ditch 32 through the seepage holes 71 on the concrete layer 7 and the water inlets 331 on the filter cover plate 33. Then, it directly enters the diversion pipe 31 through the connecting pipe 321, reducing the drainage pressure of the water collection well 5 on the road surface.

[0056] Reference Figure 4The support structure 2 includes a support frame 21, which is fixed to the side wall of the existing underground drainage culvert 1 by expansion bolts. The support frame 21 is equipped with a fixing assembly for fixing the diversion pipe 31. The fixing assembly includes a first sleeve 22 fixedly mounted on the support frame 21, a second sleeve 23 slidably mounted on the support frame 21, and a fixing element 24 for preventing the second sleeve 23 from sliding. A sliding sleeve 231 is fixedly mounted on the second sleeve 23, and the sliding sleeve 231 is fitted onto the support frame 21 and slidably engages with it. Both the first sleeve 22 and the second sleeve 23 are equipped with features that interact with the diversion pipe 31. The pipe 31 is fitted with a clamping groove, and the fastener 24 includes a bolt. The side wall of the sliding sleeve 231 is provided with an installation hole. The support frame 21 is provided with a waist-shaped groove 211 along the sliding direction of the sliding sleeve 231. The bolt passes through the installation hole and the waist-shaped groove 211. The bolt is threaded with a nut. The guide pipe 31 is installed between the first clamping sleeve 22 and the second clamping sleeve 23. The second clamping sleeve 23 is driven to slide, clamping the guide pipe 31 in the clamping groove on the first clamping sleeve 22 and the second clamping sleeve 23. Then the bolt and nut are tightened to fix the sliding sleeve 231, thereby fixing the guide pipe 31 on the support frame 21.

[0057] Reference Figure 6 The diversion structure 6 includes a mounting frame 61 fixedly installed inside the water collection well 5 and an inlet bucket 62 fixedly installed on the mounting frame 61. The mounting frame 61 is fixed to the side wall of the water collection well 5 by expansion bolts. When the inlet bucket 62 is installed, the gap between the inlet bucket 62 and the side wall of the water collection well 5 is sealed with concrete. The top of the inlet bucket 62 is open, and the side wall of the inlet bucket 62 is provided with an inlet and an outlet. In traditional municipal drainage systems, the two sides of the water collection well 5 are usually connected to the underground drainage culvert 1, and the diversion pipes 31 in the underground drainage culvert 1 on both sides pass through the inlet and outlet of the inlet bucket 62 respectively and are connected to the inlet bucket 62.

[0058] Reference Figure 6 A filter cage 621 is fixedly installed inside the water inlet tank 62, and the guide pipes 31 in the underground drainage culverts 1 on both sides of the water collection well 5 extend into the filter cage 621. By installing the filter cage 621 inside the water inlet tank 62 and extending the guide pipes 31 into the filter cage 621, it is effectively prevented that some debris or fallen leaves on the road surface enter the guide pipes 31, causing blockage of the guide pipes 31 or the seepage pipes 4.

[0059] Reference Figure 6The bottom wall of the water inlet tank 62 has a discharge port 622. A pressure cap 623 is slidably mounted vertically inside the water inlet tank 62, and the pressure cap 623 is adapted to the discharge port 622. A driving assembly for driving the pressure cap 623 to slide is provided inside the water inlet tank 62. The driving assembly includes a transmission screw 611, a sleeve rod 624, and a turntable 612. The transmission screw 611 is rotatably mounted on the mounting bracket 61, and the axis of the transmission screw 611 is vertical. The sleeve rod 624 is fixedly mounted on the pressure cap 623. A fixing bracket 625 is fixedly mounted inside the water inlet tank 62. A through hole is provided in the vertical direction. The sleeve rod 624 passes through the through hole and slides with the fixing frame 625. A guide strip is fixedly provided on the side wall of the sleeve rod 624. The length direction of the guide strip is consistent with the length direction of the sleeve rod 624. A guide groove communicating with the through hole is provided in the vertical direction on the fixing frame 625. The guide strip slides through the guide groove. An internal thread adapted to the transmission screw 611 is provided in the sleeve rod 624. The transmission screw 611 passes through the sleeve rod 624 and is threaded with the sleeve rod 624. The turntable 612 is coaxially fixedly connected to the transmission screw 611.

[0060] When the rainfall is too heavy and exceeds the maximum drainage capacity of the diversion pipe 31, resulting in severe water accumulation on the road, the drive screw 611 is driven to rotate by rotating the turntable 612, which in turn drives the pressure cover 623 to slide, causing the discharge port 622 to open. The water in the collection well 5 enters the underground drainage culvert 1 through the discharge port 622 and is discharged, which can effectively relieve the drainage pressure of the diversion pipe 31.

[0061] Reference Figure 6 A cleaning frame 626 is fixedly mounted on the transmission screw 611, and a brush plate 627 is fixedly mounted on the cleaning frame 626. The brush plate 627 is equipped with bristles that abut against the bottom wall of the water inlet 62. When it is necessary to clean the debris or fallen leaves in the water inlet 62, the transmission screw 611 rotates and slides the pressure cover 623, opening the discharge port 622. At the same time, the transmission screw 611 drives the cleaning frame 626 to rotate and flush water into the water inlet 62. The brush plate 627 scrubs the inside of the water inlet 62, and the debris or fallen leaves in the water inlet 62 enter the underground drainage culvert 1 through the discharge port 622, thus facilitating the cleaning of the debris or fallen leaves in the water inlet 62.

[0062] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A construction method for the rainwater and sewage separation renovation of an old urban municipal drainage system, characterized in that, Includes the following steps: S1. Pipeline excavation: Excavate on the existing municipal drainage system pipeline until the existing underground drainage culvert is cleared (1). S2, Installation of support structure (2): Install support structure (2) on the side wall of the existing underground drainage culvert (1); S3, Rainwater pipe (3) installation: Install the rainwater pipe (3) on the support structure (2), plan the layout of the rainwater pipe (3), and connect the rainwater pipe (3) to the river or irrigation canal; S4. Installation of the diversion structure (6): The diversion structure (6) is installed in the collection well (5) of the existing municipal drainage system. The diversion structure (6) is installed near the top of the collection well (5) and connected to the rainwater pipe (3). After the ground rainwater is collected in the collection well (5), it is guided by the diversion structure (6) and enters the rainwater pipe (3). S5. Concrete layer (7) construction: Concrete is poured on top of the rainwater pipe (3) to form a concrete layer (7), and then the rainwater pipe (3) is buried underground. When installing the rainwater pipe (3), a seepage pipe (4) is buried in the soil around the rainwater pipe (3) and the seepage pipe (4) is connected to the rainwater pipe (3); The rainwater pipeline (3) includes a diversion pipe (31), a drainage ditch (32), and a filter cover plate (33). The diversion pipe (31) is installed on the support structure (2). The seepage pipe (4) is connected to the rainwater pipeline (3). The drainage ditch (32) is installed on the top of the diversion pipe (31) and is connected to the collection well (5). The drainage ditch (32) is connected to a connecting pipe (321) and is connected to the diversion pipe (31). The filter cover plate (33) is fastened to the top of the drainage ditch (32). The filter cover plate (33) has several water inlets (331) on it. The concrete layer (7) is laid on the filter cover plate (33) and has several seepage holes (71) connected to the water inlets (331). The flow guiding structure (6) includes a mounting frame (61) fixedly installed in the water collection well (5) and a water inlet bucket (62) fixedly installed on the mounting frame (61). The top of the water inlet bucket (62) is open, and the flow guiding pipe (31) is connected to the water inlet bucket (62).

2. The method for constructing a rainwater and sewage separation renovation project for an old urban municipal drainage system according to claim 1, characterized in that: The support structure (2) includes a support frame (21), which is fixed to the side wall of the original underground drainage culvert (1) by expansion bolts. The support frame (21) is provided with a fixing component for fixing the diversion pipe (31).

3. The method for constructing a rainwater and sewage separation renovation project for an old urban municipal drainage system according to claim 2, characterized in that: The fixing assembly includes a first sleeve (22) fixedly mounted on the support frame (21), a second sleeve (23) slidably mounted on the support frame (21), and a fixing member (24) for preventing the second sleeve (23) from sliding. Both the first sleeve (22) and the second sleeve (23) are provided with a groove adapted to the guide pipe (31).

4. The construction method for rainwater and sewage separation renovation of an old urban municipal drainage system according to claim 1, characterized in that: A filter cage (621) is fixedly installed inside the water inlet tank (62), and the guide pipe (31) extends into the filter cage (621).

5. The method for constructing a rainwater and sewage separation renovation project for an old urban municipal drainage system according to claim 4, characterized in that: The bottom wall of the water inlet (62) is provided with a discharge port (622), and a pressure cover (623) is slidably disposed inside the water inlet (62). The pressure cover (623) is used to close the discharge port (622), and a driving component is provided inside the water inlet (62) to drive the pressure cover (623) to slide.

6. The construction method for rainwater and sewage separation renovation of an old urban municipal drainage system according to claim 5, characterized in that: The drive assembly includes a transmission screw (611), a sleeve (624), and a turntable (612). The transmission screw (611) is rotatably mounted on the mounting bracket (61). The sleeve (624) is fixedly mounted on the pressure cap (623) and is slidably engaged with the mounting bracket (61). The sleeve (624) has an internal thread that matches the transmission screw (611). The transmission screw (611) passes through the sleeve (624) and is threadedly engaged with the sleeve (624). The turntable (612) is coaxially and fixedly connected to the transmission screw (611).

7. The method for constructing a rainwater and sewage separation renovation project for an old urban municipal drainage system according to claim 6, characterized in that: A cleaning frame (626) is fixedly installed on the transmission screw (611), and a brush plate (627) is fixedly installed on the cleaning frame (626). The brush plate (627) is provided with brush bristles, which abut against the bottom wall inside the water inlet tank (62).

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