A town drainage system
By adding a second sewage pipe and rainwater pipe to the urban drainage system, combined with low-water-level operation and storage system, the problem of mixed rainwater and sewage was solved, rainwater and sewage were separated, overflow and pollution were reduced, and the water environment and system efficiency were improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 厦门市城市规划设计研究院有限公司
- Filing Date
- 2025-07-04
- Publication Date
- 2026-05-26
AI Technical Summary
The serious problem of combined sewer overflows in urban drainage systems leads to frequent flooding and water pollution, and existing systems are struggling to adapt to changing external conditions and emerging threats.
A second sewage pipe and/or a second rainwater pipe are added to the combined sewer system, and the sewage treatment system is connected through the main sewage pipe to achieve separation of rainwater and sewage. In the separate collection system, the sewage main pipe and sewage pipe are operated at low water levels, and unified scheduling is carried out in conjunction with the storage system and detection elements.
It effectively reduces sewage overflow and treatment system load during rainy days, reduces pollution of natural water bodies, improves water quality, alleviates urban flooding, and is easy to retrofit.
Smart Images
Figure CN224281503U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of municipal engineering technology, and in particular to an urban drainage system. Background Technology
[0002] In recent years, the population of densely built-up urban areas has continued to increase, the area of impermeable paved surfaces has expanded, and economic activities have become increasingly prosperous, exacerbating the "rain island effect" and "pollution island effect," and placing higher demands on urban underground drainage systems. At the same time, the underground drainage systems in densely built-up areas are characterized by long-term nature and technological lock-in, making them difficult to adapt to constantly changing external conditions and emerging threats and challenges. This is also the root cause of a series of urban "water problems" such as frequent flooding, water pollution, and aquatic ecosystem degradation.
[0003] Urban drainage systems are divided into two types: separate sewer systems and combined sewer systems. Due to historical reasons and limitations in planning and design, early urban drainage systems were mostly combined sewer systems, and many cities still use them today. A combined sewer system refers to a system that mixes domestic sewage, industrial wastewater, and rainwater in the same pipe system for discharge. Newly built urban drainage systems are mainly separate sewer systems. Therefore, with urban development, many cities will have both separate and combined sewer systems coexisting.
[0004] Separate sewer systems suffer from severe rainwater and sewage mixing (the mixing of rainwater and sewage pipes is not in the original design but caused by misconnections during actual pipe construction). This mixing leads to sewage flowing into water bodies through rainwater pipes, necessitating interception at the end of the rainwater pipes. Because of this mixing, during rainy weather, overflow occurs, with actual sewage flowing downstream into rivers and entering water bodies, while rainwater enters wastewater treatment plants. During dry weather, rainwater pipes function as sewage pipes, accumulating pollutants that accumulate and eventually enter water bodies during rain. The original interception system becomes a primary rainwater collection system. Combined sewer systems, due to inadequate interception and storage systems, and the fact that rainwater and sewage actually flow into the interception pipes together, result in high water levels in the interception pipes daily, still facing sewage overflow problems during rainy weather. In general, rainwater and sewage mixing is very common in urban drainage systems, and this mixing exacerbates waterlogging. Utility Model Content
[0005] The purpose of this invention is to provide an urban drainage system that can achieve separation of rainwater and sewage, low water level operation of the main sewage system, and smooth flow of rainwater, thereby improving the efficiency of the urban drainage system, alleviating urban flooding, and improving the quality of the water environment.
[0006] To achieve the above objectives, this utility model discloses an urban drainage system, including a separate collection system, a combined collection system, an interception system, and a sewage treatment system. The interception system includes an interception pipe, an overflow pipe, and an interception well. One end of the interception pipe is connected to the sewage treatment system, and the other end is connected to the interception well. One end of the overflow pipe is connected to the interception well, and the other end is connected to the stormwater discharge area. The separate collection system includes a first sewage pipe, a first stormwater pipe, and a sewage trunk line. The first sewage pipe is connected to the sewage treatment system via the sewage trunk line, and the first stormwater pipe is connected to the interception system. The combined sewer system includes a combined sewer pipe connected to a interception well; characterized in that it further includes a main sewage pipe and a second sewage pipe and / or a second rainwater pipe installed in the combined sewer system, wherein the main sewage pipe is connected to a sewage treatment system and a second sewage pipe; the main sewage pipe is connected to part or all of the first sewage pipe, or the main sewage pipe is connected to part or all of the sewage trunk pipe, or the main sewage pipe is connected to part or all of the first sewage pipe and part or all of the sewage trunk pipe; the second rainwater pipe is connected to a rainwater discharge area.
[0007] By adding a second sewage pipe to the combined sewer system for dedicated sewage discharge, and connecting this second sewage pipe to the sewage treatment system via the main sewage pipe, the load on the combined sewer and its connected interception system can be effectively reduced during rainy days, preventing sewage overflow and achieving a good separation of rainwater and sewage. Adding a second rainwater pipe to the combined sewer system reduces the amount of rainwater entering the combined sewer, thereby reducing the volume of rainwater entering the sewage treatment system from the interception system, and consequently reducing the operating load on the sewage treatment system and the impact load of rainwater on the pipe network during rainy days. Furthermore, it effectively reduces the amount of sewage overflowing into natural water bodies during rainy days, thus reducing the risk of sewage pollution of natural water bodies. In contrast, in the separate sewer system, the first sewage pipe and / or the main sewage pipe are connected to the main sewage pipe. Both the main sewage pipe and the first sewage pipe can operate at low water levels. This way, even if some parts of the first sewage pipe and the first rainwater pipe are mistakenly connected, sewage can be effectively prevented or reduced from flowing into the first rainwater pipe, achieving a good separation of rainwater and sewage. Moreover, the first rainwater pipe is less prone to clogging, facilitating rainwater drainage and alleviating urban flooding. In addition, because the system operates well in separating rainwater and sewage, it can improve the quality of the water environment. Furthermore, the system is easy to retrofit; for existing old systems, only the addition of a main sewage pipe and a second sewage pipe is needed to effectively improve the efficiency of the existing drainage system.
[0008] Preferably, when the combined sewer system does not have a second rainwater pipe, the combined sewer pipe is used as a rainwater pipe. This configuration allows the combined sewer system to be converted into a separate sewer system, facilitating the separation of rainwater and sewage. Furthermore, during the renovation of existing systems, because the second sewage pipe is a new addition, it is easier to distinguish from the old pipe (combined sewer pipe), making the resulting separate sewer system less prone to the problem of rainwater and sewage mixing.
[0009] Preferably, the calculated diameter of the main sewage pipe is A, and the designed diameter of the main sewage pipe is B, then B = A + C, C = 200 - 400, where A, B, and C are all in mm. According to the "Outdoor Drainage Design Code," the calculated diameter of the main sewage pipe is calculated based on the volume of domestic sewage in its corresponding catchment area. The designed diameter is the actual diameter of the main sewage pipe installed on-site during construction. Increasing the diameter of the main sewage pipe ensures low-water-level operation of the sewage pipeline and extends its dredging cycle.
[0010] Preferably, the main sewage pipe is made of ductile iron. This arrangement ensures the service life of the main sewage pipe.
[0011] Preferably, the rainwater discharge area is a drainage ditch or a river.
[0012] Preferably, the main sewage pipe is laid along the flow direction of the drainage ditch or river. This arrangement facilitates the construction, installation, and subsequent maintenance of the main sewage pipe.
[0013] Preferably, it also includes a water storage system connected to part or all of the combined sewer. This arrangement makes the town's water system more complete.
[0014] Preferably, the system also includes a control terminal; the interception well is equipped with a detection element, which is one or more of a water quality monitoring element, a water level monitoring element, a flow rate detection element, and a video detection element; the detection element is connected to the control terminal. This configuration facilitates unified scheduling of the interception system and also promotes better separation of rainwater and sewage.
[0015] This utility model has the following beneficial effects:
[0016] This invention adds a second sewage pipe to a combined sewer system for dedicated sewage discharge. This second sewage pipe connects to the sewage treatment system via the main sewage pipe. During rainy weather, this effectively reduces the load on the combined sewer and its connected interception system, preventing sewage overflow and achieving good separation of rainwater and sewage. Adding a second rainwater pipe to the combined sewer system reduces the amount of rainwater entering the combined sewer, thereby reducing the volume of rainwater entering the sewage treatment system through the interception system. This further reduces the operating load on the sewage treatment system and the impact load of rainwater on the pipe network during rainy weather. Furthermore, it effectively reduces the amount of sewage overflowing into natural water bodies during rainy weather, thus reducing the risk of sewage pollution of natural water bodies. The separate collection system connects the first sewage pipe and / or the sewage trunk line to the main sewage pipe. Both the sewage trunk line and the first sewage pipe can operate at low water levels. This effectively prevents or reduces sewage flow into the first rainwater pipe even if some parts of the first sewage pipe and the first rainwater pipe are mistakenly connected, achieving a good separation of rainwater and sewage. Furthermore, the first rainwater pipe is less prone to clogging, facilitating rainwater drainage and alleviating urban flooding. In addition, the efficient operation of this separate rainwater and sewage system improves water quality. Moreover, this system is easy to retrofit; for existing systems, only the addition of a main sewage pipe and a second sewage pipe is needed to effectively improve the efficiency of the existing drainage system. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of Example 1.
[0018] Figure 2 This is a schematic diagram of Example 2.
[0019] Figure 3 This is a schematic diagram of Example 3.
[0020] Explanation of symbols for main components:
[0021] The system includes a separate collection system 10, a first sewage pipe 11, a first rainwater pipe 12, a sewage trunk pipe 13, and a combined rainwater and sewage connection point 14.
[0022] Combined sewer collection system 20, combined sewer pipe 21, second sewage pipe 22, second rainwater pipe 23;
[0023] Interception pipe 31, overflow pipe 32, interception well 33;
[0024] Wastewater treatment system 40;
[0025] Storage and regulation system 50;
[0026] Rainwater drainage area 60;
[0027] 70mm sewage main pipe. Detailed Implementation
[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.
[0029] Example 1
[0030] like Figure 1 As shown, this embodiment discloses an urban drainage system, including a separate collection system 10, a combined collection system 20, an interception system, and a sewage treatment system 40. The interception system includes an interception pipe 31, an overflow pipe 32, and an interception well 33. One end of the interception pipe 31 is connected to the sewage treatment system 40, and the other end is connected to the interception well 33. One end of the overflow pipe 32 is connected to the interception well, and the other end is connected to a rainwater discharge area 60, which is a drainage ditch or river. The interception system is prior art, and its interception principle will not be described in detail. The sewage treatment system 40 is generally a sewage treatment plant. The separate collection system 10 includes a first sewage pipe 11, a first rainwater pipe 12, and a sewage trunk pipe 13. The first sewage pipe 11 is connected to the sewage treatment system 40 via the sewage trunk pipe 13, and the first rainwater pipe 12 is connected to the interception well. The combined collection system 20 includes a combined pipe 21, which is connected to the interception well 33. The aforementioned system structure is the common urban drainage system currently in use, referred to as the existing old system in this case. In the separate collection system 10, the first sewage pipe 11 and the first rainwater pipe 12 were constructed simultaneously. Due to various factors, it is difficult to avoid the possibility of misconnection between the two, i.e. Figure 1 The example shown is the combined sewer connection point 14. The existing combined sewer 21 in the old system is essentially a combined sewer connection point.
[0031] This embodiment of the urban drainage system is an improvement on the existing system. Specifically, a main sewage pipe 70 is added to the entire drainage system, and a second sewage pipe 22 is added to the combined sewer system 20. The main sewage pipe 70 connects to the sewage treatment system 40, the second sewage pipe 22, part or all of the first sewage pipe 11, and part or all of the sewage trunk pipe 13. For example, the sewage trunk pipe 13 and the first sewage pipe 11, which are closer to the sewage treatment system 40, have shorter flow paths and can be directly connected to the sewage treatment system 40. Of course, considering factors such as rainwater and sewage flow, as one alternative, only part or all of the first sewage pipe 11 is connected to the main sewage pipe 70, while the sewage trunk pipe 13 is not connected to the main sewage pipe 70 (i.e., the sewage trunk pipe 13 and the main sewage pipe 70 do not intersect); as another alternative, only part or all of the sewage trunk pipe 13 is connected to the main sewage pipe 70, while the first sewage pipe 11 is not connected to the main sewage pipe 70 (i.e., the first sewage pipe 11 and the main sewage pipe 70 do not intersect).
[0032] Because the combined sewer system 20 has a dedicated second sewage pipe 22 for wastewater discharge, the combined sewer pipe 21 can be directly converted into a rainwater pipe, thus completing the conversion from a combined sewer system to a separate sewer system. The interception system connected to the combined sewer pipe 21 can intercept the first rainwater. Since the second sewage pipe 22 is a new pipe, it is easier to distinguish from the old pipe (combined sewer pipe 21), making the converted separate sewer system 10 less prone to the problem of rainwater and sewage mixing.
[0033] By adding a second sewage pipe 22 to the combined sewer collection system 20 for dedicated sewage discharge, and connecting the second sewage pipe 22 to the sewage treatment system 40 via the main sewage pipe 70, the load on the combined sewer pipe 21 and the interception system connected to it can be effectively reduced during rainy days, preventing sewage overflow and achieving a good separation of rainwater and sewage. Meanwhile, the first sewage pipe 11 and the main sewage pipe 13 of the separate collection system 10 are connected to the main sewage pipe 70. Both the main sewage pipe 13 and the first sewage pipe 11 can operate at low water levels. This ensures that even if some parts of the first sewage pipe 11 and the first rainwater pipe 12 are mistakenly connected, sewage flow into the first rainwater pipe 12 can be effectively prevented or reduced, achieving a good separation of rainwater and sewage. Furthermore, the first rainwater pipe 12 is less prone to clogging, facilitating rainwater drainage and alleviating urban flooding.
[0034] The main sewage pipe 70 is laid along the flow direction of the drainage ditch or river to facilitate its construction, installation, and subsequent maintenance. To ensure the service life of the main sewage pipe 70, ductile iron is preferred. Furthermore, to ensure low-water-level operation of the sewage pipeline and extend the dredging cycle of the main sewage pipe 70, the calculated pipe diameter of the main sewage pipe 70 is defined as A, and the design pipe diameter as B. Therefore, B = A + C, C = 200 - 400, where A, B, and C are all in mm. According to the "Outdoor Drainage Design Code," the calculated pipe diameter of the main sewage pipe 70 is calculated based on the volume of domestic sewage in its corresponding catchment area. The design pipe diameter is the actual diameter of the main sewage pipe 70 installed on-site during construction.
[0035] Some cities' water systems also have a storage system 50, which is connected to some or all of the combined sewer 21, in order to make the urban water system more complete.
[0036] To facilitate unified scheduling of the interception system and improve the separation of rainwater and sewage, a control terminal is also installed. Additionally, detection elements are installed in interception well 33. These elements can be one or more of the following: water quality monitoring elements, water level monitoring elements, flow rate monitoring elements, and video monitoring elements. The selection of detection elements is adapted to the site conditions, and the detection elements are connected to the control terminal.
[0037] Example 2
[0038] like Figure 2As shown, the difference between this embodiment and Embodiment 1 is that the second sewage pipe 22 is removed, and a second rainwater pipe 23 is added instead. The second rainwater pipe 23 is directly connected to the rainwater discharge area 60. By adding the second rainwater pipe 23, the amount of rainwater entering the combined sewer 21 can be reduced, thereby reducing the volume of rainwater intercepted by the system entering the sewage treatment system 40. This reduces the operating load of the sewage treatment system 40 and the impact load of rainwater on the pipe network during rainy days. In addition, it effectively reduces the amount of sewage overflowing into natural water bodies during rainy days, thereby reducing the risk of natural water bodies being polluted by sewage.
[0039] Example 3
[0040] like Figure 3 As shown, this embodiment, based on Embodiment 1, adds a second rainwater pipe 23, which is directly connected to the rainwater discharge area 60. This embodiment combines the effects of Embodiment 1 and Embodiment 2. This embodiment is particularly suitable for towns with high rainfall.
[0041] It should be noted that the number of the first sewage pipe 11, the first rainwater pipe 12, the sewage trunk pipe 13, the combined sewer pipe 21, the second sewage pipe 22, the second rainwater pipe 23, and the main sewage pipe 70 is not limited in this case. This is because factors such as topography, urban size, and urban industrial development can cause the number of these pipes to vary. Therefore, it is unavoidable that some of the second sewage pipes 22 are connected to one main sewage pipe 70, while some of the second sewage pipes 22 are connected to another main sewage pipe 70. However, such situations should still be regarded as the second sewage pipes 22 being connected to the main sewage pipe 70.
[0042] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.
Claims
1. An urban drainage system, comprising a separate collection system, a combined collection system, an interception system, and a sewage treatment system; the interception system includes an interception pipe, an overflow pipe, and an interception well; one end of the interception pipe is connected to the sewage treatment system, and the other end of the interception pipe is connected to the interception well; one end of the overflow pipe is connected to the interception well, and the other end of the overflow pipe is connected to a stormwater discharge area; the separate collection system includes a first sewage pipe, a first stormwater pipe, and a sewage trunk pipe; the first sewage pipe is connected to the sewage treatment system via the sewage trunk pipe, and the first stormwater pipe is connected to the interception well; the combined collection system includes a combined pipe connected to the interception well; characterized in that: It also includes a main sewage pipe and a second sewage pipe and / or a second rainwater pipe installed in a combined sewer system. The main sewage pipe is connected to the sewage treatment system and the second sewage pipe. The main sewage pipe is connected to part or all of the first sewage pipe, or the main sewage pipe is connected to part or all of the sewage trunk pipe, or the main sewage pipe is connected to part or all of the first sewage pipe and part or all of the sewage trunk pipe. The second rainwater pipe connects to the rainwater discharge area.
2. The urban drainage system according to claim 1, characterized in that: When the combined sewer collection system does not have a second rainwater pipe, the combined sewer pipe is used as a rainwater pipe.
3. The urban drainage system according to claim 1, characterized in that: The calculated diameter of the main sewage pipe is A, and the designed diameter of the main sewage pipe is B. Then B = A + C, C = 200 - 400, and the units of A, B, and C are all mm.
4. The urban drainage system according to claim 1, characterized in that: The main sewage pipe is made of ductile iron.
5. The urban drainage system according to claim 1, characterized in that: The rainwater discharge area is a drainage ditch or river.
6. The urban drainage system according to claim 5, characterized in that: The main sewage pipe is laid out along the flow direction of the drainage ditch or river.
7. The urban drainage system according to claim 1, characterized in that: It also includes a storage system, which is connected to part or all of the confluence pipe.
8. The urban drainage system according to claim 1, characterized in that: It also includes a control terminal; the interception well is equipped with a detection element, which is one or more of a water quality monitoring element, a water level monitoring element, a flow detection element, and a video detection element; the detection element is connected to the control terminal.