A drainage system and drainage method based on municipal road combined sewer network

Abstract

The present invention discloses a drainage system based on a municipal road combined pipe network, the drainage system comprising: a combined branch pipe; an interception part, the interception part having an inlet and a first outlet, the inlet being connected to the sewage branch pipe, and the first outlet being connected to the combined branch pipe; a buffer part, being connected to the interception part through a second outlet; a diversion facility, which is arranged on the municipal combined pipe, and the diversion facility having an inlet, a third outlet and a fourth outlet; the present invention arranges the interception part, in rainy days, the first outlet of the interception part is closed, at this time the rainwater flowing into the rainwater inlet is merged into the combined branch pipe, so as to avoid the mixing of sewage and rainwater; in sunny days, the first outlet of the interception part is opened, at this time the domestic sewage transported by the combined branch pipe flows into the sewage treatment facility through the combined branch pipe, the municipal combined pipe and the diversion facility, so as to realize the diversion of rainwater and sewage in the unit area, so as to avoid the mixing of sewage and rainwater, and the combined branch pipe can realize multiple uses of one pipe, and the modification of the existing pipe network system is not large, the modification cost is low, and the application scope is wide.

Description

Technical Field

[0001] The present invention relates to the technical field of drainage, and in particular to a drainage system and a drainage method based on a municipal road combined sewer network. Background Art

[0002] Urban municipal road pipe networks are divided into municipal combined pipe network systems and separate pipe network systems. The existing drainage system for municipal combined pipe networks mixes sewage, industrial wastewater and rainwater in the same pipe, and discharges them directly into nearby water bodies or into sewage treatment facilities for treatment. If they are discharged directly into natural water bodies, the receiving water bodies will suffer serious pollution. If they are discharged directly into sewage treatment facilities for treatment, a large amount of relatively clean rainwater on rainy days will enter the sewage treatment facilities for unnecessary treatment, resulting in a waste of resources.

[0003] It can be seen from this that the existing technology has the problem that for combined sewer systems, sewage and rainwater are mixed together. When discharged directly into natural water bodies, the receiving water bodies are seriously polluted. When discharged directly into sewage treatment facilities for treatment, a large amount of relatively clean rainwater on rainy days enters the sewage treatment facilities for unnecessary treatment, causing a waste of resources. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned background technology and to provide a drainage system and drainage method based on a municipal road combined sewer network, which has the advantages of rainwater and sewage separation, low treatment cost and good treatment effect.

[0005] The present invention provides a drainage system based on a municipal road combined sewer network, comprising a combined branch pipe, along which the sewage branch pipe rainwater outlets in the unit area are respectively connected; an interception part, which is arranged near the access position where the sewage branch pipe is connected to the combined branch pipe or upstream of the access position, the interception part has an inlet and a first outlet, the inlet is connected to the sewage branch pipe, the first outlet is connected to the combined branch pipe, and a first hydraulic switch is arranged to control the water flow of the first outlet; a buffer part, the interception part is provided with a second outlet, the buffer part is connected to the second outlet, and the buffer part is used to The diversion facility stores sewage flowing out of the sewage branch pipe; the diversion facility is arranged on the municipal combined pipe, the diversion facility has an inlet, a third outlet and a fourth outlet, the inlet of the diversion facility is connected to the combined branch pipe, the third outlet is connected to the sewage treatment facility, and the fourth outlet is connected to the pipeline or natural water body downstream of the diversion facility, and the diversion facility is located downstream of the combined branch pipe, the sewage branch pipe, and the rainwater outlet, the diversion facility also has hydraulic switches that control water passing through the third outlet and the fourth outlet respectively, and the diversion facility is used to divert dirty water to the sewage treatment facility, and divert clean water to the pipeline or natural water body of the diversion facility.

[0006] Optionally, it includes: a sewage receiving facility is provided between the sewage branch pipe and the intercepting part, and the inlet of the intercepting part is connected to the outlet of the sewage receiving facility.

[0007] Optionally, the interception part is a diversion well, an interception well, a discarding well, a buffer gallery or an installation well; the buffer part is a pool structure or a tank structure with a storage space, and a hydraulic switch for controlling water flow through the second outlet is provided near the second outlet.

[0008] Optionally, it also includes a control system, which includes a first monitoring device and a controller, and the first monitoring device is connected to the controller signal; the controller is used to control the action of the water switch of the first outlet according to the rainfall signal.

[0009] Optionally, when the first monitoring device is at least one of a device for monitoring water level, a device for monitoring water quality, a device for monitoring rainfall, and a device for monitoring the total amount of water; correspondingly, the rainfall signal is at least one of a water level signal, a water quality signal, a rainfall signal, and a total amount of water signal.

[0010] Optionally, the number of the sewage branch pipes is 1, the number of the intercepting parts is 1, and a sewage receiving facility is arranged between the sewage branch pipe and the intercepting part, and the inlet of the intercepting part is connected to the outlet of the sewage receiving facility; or, the number of the sewage branch pipes is several, the number of the intercepting parts and the number of the sewage receiving facilities are both adapted to the number of the sewage branch pipes, and a corresponding sewage receiving facility is arranged between each of the sewage branch pipes and a corresponding one of the intercepting parts, and the inlet of each of the intercepting parts is connected to the outlet of a corresponding one of the sewage receiving facilities; or, the number of the sewage branch pipes is several, the number of the intercepting parts and the number of the sewage receiving facilities are adapted to the number of the intercepting parts, and the number of the intercepting parts or the number of the sewage receiving facilities are both smaller than the number of the sewage branch pipes, a part of the sewage branch pipes among the several sewage branch pipes are connected to a corresponding one of the intercepting parts through a sewage receiving facility, and each of the remaining sewage branch pipes is connected to a corresponding one of the intercepting parts through a corresponding one of the sewage receiving facilities.

[0011] Optionally, the control system further includes a third monitoring device, which is used to monitor a capacity signal of the sewage treatment facility and transmit the capacity signal to the controller.

[0012] Optionally, the control system further comprises a second monitoring device, the second monitoring device being connected to the controller signal, the second monitoring device being used to monitor a liquid level height signal in the buffer portion (4).

[0013] The present invention also provides a drainage system based on a municipal road combined sewer network, which is applied to several unit areas, including: a combined branch pipe, along which several sewage branch pipes and rainwater inlets in the several unit areas are respectively connected; several intercepting parts, each of which corresponds to one or several of the sewage branch pipes and is connected, and is arranged near the access point where the sewage branch pipe is connected to the combined branch pipe or upstream of the access point, each of the intercepting parts has an inlet and a first outlet, the inlet is connected to the corresponding sewage branch pipe, and the first outlet is connected to the combined branch pipe through a first hydraulic switch, The first hydraulic switch controls the water flow through the first outlet; the diversion facility is arranged on the municipal combined pipe, the diversion facility has an inlet, a third outlet and a fourth outlet, the inlet of the diversion facility is connected to the combined branch pipe, the third outlet is connected to the sewage treatment facility, and the fourth outlet is connected to the pipeline or natural water body downstream of the diversion facility, and the diversion facility is located downstream of the combined branch pipe, the sewage branch pipe, and the rainwater outlet. The diversion facility also has hydraulic switches that control the water flow through the third outlet and the fourth outlet respectively. The diversion facility is used to divert dirty water to the sewage treatment facility and divert clean water to the pipeline or natural water body of the diversion facility.

[0014] The present invention also provides a drainage method for a combined sewer network, which is applied to any of the drainage systems described above, and is specifically as follows: when a sunny day signal is monitored, the first outlet of the interception part is opened, the third outlet of the diversion facility is opened, and the fourth outlet is closed, and the dirty water is diverted to the sewage treatment facility through the first outlet, the combined branch pipe, the municipal combined pipe, and the third outlet of the diversion facility; when a rainy day signal is monitored, the first outlet of the interception part is closed, the second outlet is opened, and the sewage in the sewage branch pipe enters the buffer part for storage; the third outlet of the diversion facility is closed, and the fourth outlet is opened, and the water flowing into the rainwater outlet is gathered into the combined branch pipe and diverted to the downstream of the diversion facility through the municipal combined pipe, the diversion facility, and the fourth outlet.

[0015] Optionally, other water body signals are also monitored and a signal threshold is set; if there is a rainy day signal and the monitored water body signal is lower than the signal threshold, the first outlet of the interception part is opened or closed, the third outlet of the diversion facility is opened, and the fourth outlet is closed, and the dirty water is diverted to the sewage treatment facility through the combined branch pipe, the municipal combined pipe, and the third outlet of the diversion facility; if there is a rainy day signal and the monitored water body signal value is higher than the signal threshold, the first outlet of the interception part is closed, the third outlet of the diversion facility is closed, and the fourth outlet is opened, and the rainwater flowing out of the rainwater outlet is merged into the combined branch pipe and diverted through the municipal combined pipe and the fourth outlet of the diversion facility to the pipeline or natural water body downstream of the diversion facility; wherein the signal threshold is one of a rainfall time threshold, a liquid level threshold, a flow threshold or a pollutant concentration threshold, and correspondingly, the other monitored water body signals are rainfall time signals, water body liquid level signals in the diversion facility, flow signals in the combined branch pipe, and pollutant concentration signals in the water in the diversion facility.

[0016] Optionally, the capacity of the sewage treatment facility is also monitored and a capacity threshold is set;

[0017] When there is a rainy day signal and the monitored water body signal is lower than the signal threshold and the monitored holding capacity of the sewage treatment facility is lower than the holding capacity threshold, the first outlet of the interception part will be opened or closed, the third outlet of the diversion facility will be opened, and the fourth outlet will be closed, and the dirty water will be diverted to the sewage treatment facility through the diversion facility and the third outlet; when there is a rainy day signal and the monitored water body signal is lower than the signal threshold and the monitored holding capacity of the sewage treatment facility is higher than the set first holding capacity threshold, the first outlet of the interception part will be closed, the third outlet of the diversion facility will be closed, and the fourth outlet will be opened, and the rainwater will be merged into the combined branch pipe and diverted through the municipal combined pipe, the diversion facility, and the fourth outlet to the pipeline or natural water body downstream of the diversion facility.

[0018] Optionally, the holding capacity of the sewage treatment facility is further monitored, and a holding capacity threshold of the sewage treatment facility is set as a first holding capacity threshold, and the holding capacity of the buffer unit is monitored, and a second holding capacity threshold of the buffer unit is set;

[0019] If a rainy day signal is given and the monitored capacity of the sewage treatment facility is lower than the first capacity threshold and the monitored capacity of the buffer is higher than the second capacity threshold, the first outlet of the interception part will be opened, the third outlet of the diversion facility will be opened, and the fourth outlet will be closed. The dirty water will be mixed with the rainwater flowing into the combined branch pipe from the rainwater outlet and flow into the sewage treatment facility through the municipal combined pipe and the third outlet of the diversion facility. If a rainy day signal is given and the monitored capacity of the sewage treatment facility is higher than the first capacity threshold, the first outlet of the interception part will be closed, the third outlet of the diversion facility will be closed, and the fourth outlet will be opened. The rainwater from the rainwater outlet will flow into the combined branch pipe through the municipal combined pipe and the fourth outlet of the diversion facility and flow into the pipeline or natural water body downstream of the diversion facility.

[0020] Compared with the prior art, the advantages of the present invention are as follows:

[0021] (1) The present invention provides a drainage system based on a municipal road combined pipe network by setting an interception part, which intercepts domestic sewage without affecting rainwater discharge. On rainy days, the first outlet of the interception part is closed. At this time, the combined branch pipe and the municipal combined pipe are equivalent to the rainwater pipe. The rainwater flowing into the rainwater inlet is merged into the combined branch pipe, passes through the municipal combined pipe, and then is diverted by the diversion facility to flow into the downstream pipeline or natural water body to avoid the mixing of sewage and rainwater. On sunny days, the first outlet of the interception part is opened. At this time, the domestic sewage transported by the combined branch pipe flows into the sewage treatment facility through the combined branch pipe, the municipal combined pipe, and the diversion facility, so that the diversion of rainwater and sewage is realized in the unit area to avoid the mixing of sewage and rainwater. The combined branch pipe and the municipal combined pipe can achieve multiple uses of one pipe, and the existing pipe network system is not greatly modified, the modification cost is low, and the scope of application is wide.

[0022] (2) The present invention provides a drainage system based on a municipal road combined sewer network with a first monitoring device and a controller to identify whether it is a sunny day or a rainy day. The controller automatically executes according to the set control logic, with various control methods and a high degree of automation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structure of Example 1.

[0024] Figure 2 This is a schematic diagram of the structure of Example 2.

[0025] Figure 3 This is a flow chart of method 1 in Example 7.

[0026] Figure 4 This is a flow chart of method 2 in Example 7.

[0027] Figure 5 This is a flow chart of method three in Example 7.

[0028] Figure 6 This is a flow chart of method 4 in Example 7.

[0029] Figure 7 This is a flow chart of method five in Example 7.

[0030] Figure 8 This is a flow chart of method six in Example 7.

[0031] Fig. 9 This is a flow chart of method seven in Example 7.

[0032] Fig.10 for Figure 1-2 Another structural schematic diagram of the middle interception part.

[0033] Figure numbers: 1-combined branch pipe, 10-sewage branch pipe, 11-rainwater inlet, 12-sewage treatment facility, 13-municipal combined pipe, 2-interception section, 3-diversion facility, 4-buffer section. DETAILED DESCRIPTION

[0034] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0035] It should be noted that, in order to explain the present invention in more detail so that those skilled in the art can understand the present invention more clearly and understandably, and further support the technical problems to be solved by the present invention and the corresponding technical effects that can be achieved, before introducing the present invention, the following explanations are given for the terminology involved:

[0036] Combined (branch) pipes are pipes used in unit area pipes to transport rainwater, sewage, or a mixture of rainwater and sewage; sewage branch pipes are pipes used in unit area pipes to transport sewage; municipal rainwater pipes are pipes used in municipal pipes to transport rainwater; municipal sewage pipes are pipes used in municipal pipes to transport sewage.

[0037] Those skilled in the art can understand that the above-mentioned "rainwater", "sewage" and "mixed water" are not limitations on the functions of "branch pipes", and "municipal rainwater" and "municipal sewage" are not limitations on the functions of "pipes", but are only used to distinguish. In other words, the combined branch pipe, sewage branch pipe, municipal rainwater pipe, and municipal sewage pipe can all use the same pipe, or different pipes, or partially the same and partially different pipes. The present invention does not limit this. As long as the pipe can realize liquid transportation, it is applicable to the present invention and is within the protection scope of the present invention.

[0038] As for the "dirty water" and "clean water" involved in the present invention, the "dirty water" can be understood as domestic sewage, or initial rain, or a mixture of domestic sewage and initial rain; "clean water" can be understood as mid-to-late rain. Specifically, for the rainfall period, the rain can be divided into initial rain and mid-to-late rain, and the division method can adopt the time method, water quality method or liquid level method in the prior art. For example, when the time method is adopted, the rain corresponding to the initial rainfall is the initial rain, and the rain corresponding to the mid-to-late rainfall is the mid-to-late rain; for example, when the water quality method is adopted, when the rainwater concentration is higher than a certain concentration threshold, the rainwater is the initial rain, and when the rainwater concentration is lower than a certain concentration threshold, the rainwater is the mid-to-late rain; for example, when the liquid level method is adopted, when the rainwater level is lower than a certain liquid level threshold, the rainwater is the initial rain, and when the rainwater level is higher than a certain liquid level threshold, the rainwater is the mid-to-late rain.

[0039] There is no limitation on which of the above methods is used to determine the initial rain or the mid-to-late rain, and the determination can be made according to actual operational requirements; in other words, any of the above methods for determining the initial rain or the mid-to-late rain is applicable to the present invention.

[0040] Of course, those skilled in the art should understand that since certain errors are allowed in the discharge of rainwater and / or sewage during actual operations, there may be certain errors in the specific division of each period. For example, there may be inaccurate division nodes between initial rain and mid- and late-stage rain, resulting in mid- and late-stage rain mixed with initial rain, or initial rain / mid- and late-stage rain mixed with a small amount of sewage, etc., so that there are errors in the division of "clean water" and "dirty water". The operational impact caused by this error does not affect the implementation effect of the entire technical solution of the present invention and can be ignored, and should not be considered to be beyond the protection scope of the present invention.

[0041] Example 1

[0042] See also Figure 1 As shown, the existing combined sewer network system has a sewage branch pipe 10, a rainwater inlet 11 and a combined branch pipe 1 located in a unit area. The water in the unit area flows out into the municipal combined pipe 13. The sewage branch pipe 10 and the rainwater inlet 11 in the unit area are respectively connected to the line of the combined branch pipe 1, and the sewage branch pipe 10 and the rainwater inlet 11 are connected in parallel to the line of the combined branch pipe 1. The unit area in this embodiment is an area where domestic sewage is generated, such as a residential area, a hospital, and an office building.

[0043] This embodiment provides a drainage system based on a municipal road combined sewer network, which is a transformation of an existing combined sewer network system. The system includes:

[0044] The intercepting portion 2 is arranged near the access position where the sewage branch pipe 10 is connected to the combined branch pipe 1 or upstream of the access position. The intercepting portion 2 has an inlet and a first outlet. The inlet is connected to the sewage branch pipe 10, and the first outlet is connected to the combined branch pipe 1. A first hydraulic switch is provided to control the water flow through the first outlet. The intercepting portion 2 in this embodiment can be a well structure such as a gate well, an installation well, a diversion well, and an intercepting well. Multiple sewage branch pipes 10 in each unit area can be collected into one pipe connected to the combined branch pipe 1. The intercepting portion 2 can be arranged on the pipe connected to the combined branch pipe 1. Multiple sewage branch pipes 10 can be connected to the combined branch pipe 1 respectively. Then, the intercepting portion 2 can be arranged on each sewage branch pipe 10 or at the position connected to the combined branch pipe 1. Specifically, the sewage branch pipes can be modified according to the actual situation of the pipes in the existing unit area, and the position and number of the intercepting portions 2 can be arranged;

[0045] The diversion facility 3 has an inlet, a third outlet and a fourth outlet. The inlet of the diversion facility 3 is connected to the municipal combined pipe. Several combined branch pipes are connected along the municipal combined pipe 13. The third outlet is connected to the sewage treatment facility 12. The fourth outlet is connected to the pipeline (municipal combined pipe) or natural water body downstream of the diversion facility 3. The diversion facility 3 is located downstream of the sewage branch pipe 10, the rainwater outlet 11 and the combined branch pipe. The diversion facility 3 also has hydraulic switches that control the water flow through the third outlet and the fourth outlet, which are the third hydraulic switch and the fourth hydraulic switch. The diversion facility 3 is used to divert dirty water to the sewage treatment facility 12 and clean water to the pipeline or natural water body downstream of the diversion facility 3. The diversion facility 3 in this embodiment has a well structure, and an inlet and an outlet are arranged on the well body. The number and arrangement of the specific outlets can be adjusted according to actual conditions. As a preferred embodiment, the well structure in this embodiment can be a concrete structure or an integrated steel structure.

[0046] Example 2

[0047] The existing combined sewer network system has a sewage branch pipe 10, a rainwater inlet 11, a sewage collection facility (such as a septic tank), and a combined branch pipe located in the unit area. The septic tank outlet and the rainwater inlet 11 in the unit area are respectively connected to the line of the combined branch pipe, and the septic tank and the rainwater inlet 11 are connected in parallel to the line of the combined branch pipe; the unit area in this embodiment is a residential area, hospital, office building and other areas.

[0048] The difference between this embodiment 2 and embodiment 1 is that:

[0049] The intercepting portion 2 in Embodiment 1 is arranged between the sewage branch pipe 10 and the combined branch pipe or at the connection position between the sewage branch pipe and the combined branch pipe;

[0050] The interception part 2 in embodiment 2 is arranged between the septic tank outlet and the confluence or at the connection part between the septic tank outlet and the confluence branch pipe. The specific location of the interception part 2 is determined by the specific environment of the unit area, and can be freely and flexibly arranged.

[0051] Example 3

[0052] See also Figure 1 and Figure 2 As shown, based on Example 1 and Example 2, for the arrangement of the sewage branch pipe, the interception part and the sewage receiving facility:

[0053] Mode 1: the number of the sewage branch pipe is 1, the number of the intercepting part 2 is 1, and a sewage receiving facility is provided between the sewage branch pipe 10 and the intercepting part 2, and the inlet of the intercepting part 2 is connected to the outlet of the sewage receiving facility;

[0054] Mode 2: The number of the sewage branch pipes 10 is several, the number of the intercepting parts 2 and the number of the sewage receiving facilities are both adapted to the number of the sewage branch pipes 10, and a corresponding sewage receiving facility is provided between each of the sewage branch pipes 10 and a corresponding intercepting part 2, and the inlet of each intercepting part 2 is connected to the outlet of a corresponding sewage receiving facility;

[0055] Method three, the number of the sewage branch pipes 10 is several, the number of the intercepting parts 2 is compatible with the number of the sewage receiving facilities, and the number of the intercepting parts 2 or the number of the sewage receiving facilities are smaller than the number of the sewage branch pipes 10, a part of the sewage branch pipes 10 among the several sewage branch pipes 10 is connected to a corresponding one of the intercepting parts 2 through a sewage receiving facility, and each of the remaining part of the sewage branch pipes 10 is connected to a corresponding one of the intercepting parts 2 through a corresponding one of the sewage receiving facilities.

[0056] Method four, the number of the sewage branch pipes 10 is several, the number of the intercepting parts 2 and the sewage receiving facility are both one, and the several sewage branch pipes 10 are connected to a corresponding one of the intercepting parts 2 through one of the sewage receiving facilities.

[0057] Those skilled in the art will understand that the arrangement of the intercepting part, the sewage branch pipe and the sewage receiving facility can be selected according to actual operational requirements through which of the above-mentioned implementation modes; in other words, the present invention does not specifically limit the arrangement of the intercepting part, the sewage branch pipe and the sewage receiving facility. The above-mentioned four implementation modes, as well as similar implementation modes in the prior art, are all applicable to the present invention as long as they can achieve the technical effect that the sewage discharged from the unit area is first collected into the sewage receiving facility after passing through the sewage branch pipe and then discharged to the intercepting part by the sewage receiving facility, and are also within the protection scope of the present invention.

[0058] In addition, in this embodiment, the number and position of the intercepting parts 2 are not specifically limited, as long as sewage interception can be achieved.

[0059] Further, please combine Fig.10 As shown, in the present embodiment 1, 2 or 3, for the interception part, it can also be several (greater than or equal to 2), that is, when there are several unit areas, the drainage system may include:

[0060] A combined branch pipe 1, along which several sewage branch pipes 10 and rainwater inlets 11 in the several unit areas are connected respectively; several intercepting parts 2 adapted to the number of unit areas, each intercepting part 2 is connected to a sewage branch pipe, and is arranged near the access point where the sewage branch pipe 10 is connected to the combined branch pipe 1 or upstream of the access point, each intercepting part 2 has an inlet and a first outlet, the inlet is connected to the corresponding sewage branch pipe 10, and the first outlet is connected to the combined branch pipe 1 through a first hydraulic switch, and the first hydraulic switch controls the water flow of the first outlet. A sewage receiving facility is arranged between each sewage branch pipe 10 and a corresponding intercepting part 2, and the inlet of the intercepting part 2 is connected to the outlet of the sewage receiving facility.

[0061] Similarly, this method also includes a control system, which includes a first monitoring device and a controller, and the first monitoring device is connected to the controller signal; the controller is used to control the action of the water switch of the first outlet according to the rainfall signal; wherein, when a sunny signal is detected, the first outlet of one or more interception parts 2 is controlled to be opened, and the dirty water flows into the combined branch pipe 1 through the first outlet; when a rainy signal is detected, the first outlet of the interception part 2 is controlled to be closed, and the water flowing into the rainwater outlet 11 converges into the combined branch pipe 1.

[0062] In this way, by constructing a drainage system with the above-mentioned pipe network structure for multiple unit areas, the pipe networks in multiple unit areas can be interconnected, and the separation of rainwater and sewage in multiple unit areas can be achieved simultaneously, which has the characteristics of low cost and wide applicability.

[0063] Example 4

[0064] Based on the above-mentioned embodiments 1 to 3, if runoff pollution is taken into consideration, as a further preferred embodiment, the diversion facility 3 is also provided with a fifth outlet, and a fifth hydraulic switch for controlling water flow through the fifth outlet, the fifth outlet is connected to the initial rain storage tank or the rainwater treatment facility, the first, third, and fourth hydraulic switches are closed, the first, third, and fourth outlets are closed, the fifth hydraulic switch is opened, and the initial rainwater is diverted to the initial rain storage tank or the rainwater treatment facility; the first, third, and fifth hydraulic switches are closed, the first, third, and fifth outlets are closed, the fourth hydraulic switch is opened, and the middle and late rainwater is diverted to the pipeline or natural water body downstream of the diversion facility.

[0065] As another preferred embodiment, a first rain storage tank can also be set on the pipeline between the third outlet of the diversion facility 3 and the sewage treatment facility to collect initial rainwater, and when the sewage treatment facility has insufficient processing capacity or insufficient capacity, the water in the first rain storage tank can be temporarily stored. When the sewage treatment plant has processing capacity, the water in the first rain storage tank can be sent to the sewage treatment facility for processing, which is convenient for sending the first rain storage tank to the sewage treatment facility.

[0066] Example 5

[0067] On the basis of embodiments 1 to 4, the drainage system of embodiment 5 further includes a controller and a first monitoring device, the first monitoring device is connected to the controller signal, the first monitoring device is used to monitor the rainfall signal, and the controller is used to control the water switch actions of the first outlet, the third outlet, and the fourth outlet according to the rainfall signal. Specifically, when a sunny signal is detected, the first water switch is turned on, the first outlet is connected, the third water switch is turned on, the third outlet is connected, the fourth water switch is turned off, the fourth outlet is intercepted, and the sewage in the unit area enters the sewage treatment facility 12 through the sewage branch pipe 10, the combined branch pipe, the municipal combined pipe, and the third outlet of the diversion facility 3; on rainy days, the first water switch is turned off, the first outlet is intercepted, the third water switch is turned off, the third outlet is intercepted, the fourth water switch is turned on, and the fourth outlet is connected, and the rainwater flowing into the rainwater outlet 11 in the unit area converges into the combined branch pipe 1, and enters the municipal combined pipe 13 or the natural water body downstream of the diversion facility 3 through the fourth outlet of the diversion facility 3. In this embodiment, the signal monitored by the first monitoring device is used to determine whether it is sunny or rainy. Taking the first monitoring device as a rain gauge, the rain gauge monitors the rainfall in the unit area, sets a rainfall threshold, and the condition that the monitored rainfall is higher than the rainfall threshold is a rainy day, otherwise it is a sunny day. The first water switch, the second water switch, and the fourth water switch described in this embodiment are turned on or off, which refers to their states on rainy days or sunny days.

[0068] Preferably, the first monitoring device is at least one of a device for monitoring water level, a device for monitoring water quality, a device for monitoring rainfall, and a device for monitoring the total amount of water. Correspondingly, the rainfall signal is at least one of a water level signal, a water quality signal, a rainfall signal, and a total amount of water signal.

[0069] Further preferably, the control system further comprises a third monitoring device, which is used to monitor the capacity signal of the sewage treatment facility 12, and the controller is used to control the hydraulic switch actions of the first outlet, the third outlet, and the fourth outlet according to the rainfall signal and the capacity signal. The third monitoring device in this embodiment is a liquid level meter disposed in the sewage treatment facility 12, which determines whether the sewage treatment facility 12 has capacity by monitoring the liquid level height in the sewage treatment facility 12. Its control logic is as follows: when the sewage treatment facility 12 has a capacity on rainy days, the unit area needs to consider runoff pollution. On rainy days, in the initial rainwater stage, the first hydraulic switch is closed, the first outlet is intercepted, the third hydraulic switch is opened, the third outlet is connected, the fourth hydraulic switch is closed, the fourth outlet is intercepted, and the initial rainwater converging from the rainwater outlet 11 in the unit area flows into the combined branch pipe 1, and enters the sewage treatment facility 12 through the third outlet of the diversion facility 3; in the middle and late rainwater stage, the first hydraulic switch is closed, the first outlet is intercepted, the third hydraulic switch is closed, the third outlet is intercepted, the fourth hydraulic switch is opened, and the fourth outlet is connected, and the middle and late rainwater flowing into the rainwater outlet 11 in the unit area flows into the combined branch pipe 1, and enters the municipal combined pipe 13 or natural water body downstream of the diversion facility 3 through the fourth outlet of the diversion facility 3. The initial rainwater in this embodiment refers to relatively dirty rainwater, and the middle and late rainwater refers to relatively clean rainwater, which is not specific to the time sequence of rainfall. In this embodiment, the capacity monitoring of the sewage treatment facility 12 in this method is implemented using the capacity signal of the third monitoring device.

[0070] As a variation, in another preferred embodiment, when the sewage treatment facility 12 has no capacity on rainy days, the diversion facility 3 is also provided with a fifth outlet, and a fifth hydraulic switch is provided near the fifth outlet, and the fifth outlet is connected to a rainwater storage tank or a rainwater treatment facility. On rainy days, in the initial rainwater stage, the first hydraulic switch, the third hydraulic switch and the fourth hydraulic switch are all closed, and the first outlet, the third outlet and the fourth outlet are all intercepted. The initial rainwater flowing into the rainwater outlet 11 in the unit area enters the combined branch pipe 1 and flows into the storage tank or the rainwater treatment facility through the fifth outlet of the diversion facility 3; in the middle and late rainwater stages, the first, third and fifth hydraulic switches are all closed, and the first, third and fifth outlets are all intercepted. The fourth hydraulic switch is opened, and the fourth outlet is connected. The middle and late rainwater flowing into the rainwater outlet 11 in the unit area converges into the combined branch pipe 1 and flows into the pipeline or natural water body downstream of the diversion facility 3 through the fourth outlet of the diversion facility 3.

[0071] Further preferably, the control system further includes a fourth monitoring device, which is used to monitor the rainfall intensity signal, and the controller is used to control the hydraulic switch actions of the first outlet, the third outlet, and the fourth outlet according to the rainfall signal and the rainfall intensity signal. The specific control logic is as follows: when the rainfall intensity is relatively low, the first and third hydraulic switches are opened, the first and third outlets are opened, the fourth hydraulic switch is closed, and the fourth outlet is closed. After the sewage in the sewage branch pipe and the rainwater gathered at the rainwater outlet are mixed in the combined branch pipe, they are diverted to the sewage treatment facility by the diversion facility; when the rainfall intensity is relatively high, the first and third hydraulic switches are closed, the first and third outlets are closed, the fourth hydraulic switch is opened, the fourth outlet is opened, the sewage branch pipe and the combined pipe are cut off, and the rainwater gathered at the rainwater outlet enters the pipeline or natural water body downstream of the diversion facility through the combined branch pipe, the municipal combined pipe, and the fourth outlet of the diversion facility. The fourth monitoring device in this embodiment is the same device as the first monitoring device, and the rainfall intensity signal is converted from the signal monitored by the first monitoring device. If the first monitoring device is a rain gauge, the rainfall intensity can be converted according to the rainfall monitored by the rain gauge. The fourth monitoring device can also be a separate device, which is set according to actual use requirements. Among them, a large rainfall intensity means that the rainfall intensity is higher than the set rainfall intensity threshold, and a small rainfall intensity means that the rainfall intensity is lower than the set rainfall intensity threshold. Therefore, the size of the rainfall intensity is determined according to the set rainfall intensity threshold, and the setting of the rainfall intensity threshold is determined by the perennial rainfall environment of the unit area and the capacity of the sewage pipe, which is not specifically limited in this embodiment.

[0072] It is suitable for the case where the rainfall duration is long, such as more than 12 hours. If the first water conservancy switch is closed for a long time to intercept the sewage branch pipe 10, the pressure of the sewage branch pipe 10 is relatively high. In order to further solve the problem of high pressure in the sewage branch pipe 10, the first and third water conservancy switches can be opened when the rainfall intensity is small and the sewage treatment facility 12 has a capacity, the first and third water conservancy switches can be opened, the first outlet and the third outlet can be connected, the fourth water conservancy switch can be closed, and the fourth outlet can be intercepted, so that part of the sewage in the sewage branch pipe 10 flows into the combined branch pipe 1, and a small amount of rainwater flows into the rainwater inlet 11 and mixes with sewage, then enters the combined branch pipe 1 and flows into the sewage treatment facility 12 through the third outlet. This method not only relieves the pressure of the sewage branch pipe 10, but also makes full use of the resources of the sewage treatment facility 12 and makes reasonable use of resources.

[0073] Example 6

[0074] See also Figure 2 As shown, after the interception part is closed to cut off the sewage branch pipe and the combined branch pipe, the volume of the sewage branch pipe itself or the volume of the septic tank to accommodate the rainy day sewage may be insufficient to accommodate the sewage, and the unit area may be flooded with sewage. Therefore, based on embodiments 1-4, as a preferred embodiment, this embodiment provides a drainage system based on a municipal road combined pipe network, which also includes:

[0075] The system is also provided with a buffer section 4. The first outlet of the interception section 2 is connected to the combined branch pipe 1. The interception section 2 is provided with a second outlet connected to the buffer section 4. The buffer section 4 is used to cache part of the domestic sewage flowing out of the septic tank. The buffer section 4 is used to store part of the domestic sewage on rainy days. The rainwater flowing out of the rainwater outlet 11 is merged into the combined branch pipe 1, which prevents the domestic sewage from mixing into the rainwater. The rainwater is diverted to the downstream pipeline or natural water body of the diversion facility 3 through the diversion facility 3. On rainy days, the domestic sewage is temporarily stored, and the combined branch pipe and the municipal combined pipe are used as rainwater pipes to discharge rainwater, delaying the discharge of domestic sewage. The control method is simple and the treatment effect is good.

[0076] Further preferably, the intercepting portion 2 and the buffer portion 4 in the above scheme are combined into a storage pool of an integrated structure, a partition is arranged in the storage pool to divide the interior of the pool body into the intercepting portion 2 and the buffer portion 4, the second outlet is located on the partition, and an inlet and a first outlet are arranged on the pool body enclosing the intercepting portion 2.

[0077] In addition, the storage pool of the present embodiment is an excavated pool structure that is at least partially located underground, and an overflow wall is arranged in the pool structure. The buffer corridor enclosed by the front side of the dividing wall and the surrounding pool body is equivalent to the interception part 2, and the storage space enclosed by the rear side of the dividing wall and the surrounding pool body is equivalent to the buffer part 4, wherein a first outlet is arranged on one side wall of the buffer corridor, a water switch is arranged near the first outlet, and a second outlet is arranged on the dividing wall. If the dividing wall is an overflow wall, the overflow port of the overflow wall is the second outlet. As another method, a second outlet may also be arranged on the dividing wall, and a water switch, i.e., a second water switch, may be arranged near the second outlet. The specific operation and use are as follows: on sunny days, the first water switch near the first outlet is turned on, the first outlet is connected, and the domestic sewage from the septic tank flows into the combined branch pipe 1 from the first outlet of the buffer corridor; on rainy days, the first water switch near the first outlet is turned off, the first outlet is cut off, and the domestic sewage from the septic tank overflows from the overflow port above the overflow wall, that is, the second outlet, into the buffer part 4 for storage, or the second water switch is turned on to connect the second outlet, so that the domestic sewage on rainy days is stored in the buffer part 4, and the rainwater flowing out of the rainwater outlet 11 flows into the combined branch pipe 1. The control method is simple, the operability is strong, and the rainwater and sewage diversion can be achieved from the source.

[0078] In another preferred embodiment, the interception part 2 and the buffer part 4 in the above embodiment are split structures, the interception part 2 is a diversion well, an interception well or a discarded well, and the buffer part 4 is a pool structure or a tank body with a storage space. When the diversion well, the interception well or the discarded well adopts a weir structure or a slot weir structure, a first outlet and a second outlet are set on the well body of the diversion well, the interception well or the discarded well, and a hydraulic switch, i.e., a first hydraulic switch, can be installed only near the first outlet, and the second outlet is located downstream of the overflow weir in the well. Diversion wells, interception wells or discarded wells of other structures need to be provided with a second hydraulic switch near the second outlet to control the water flow through the second outlet. The interception part 2 and the buffer part 4 can be installed in appropriate areas according to the specific conditions of the use environment, which is flexible and convenient and has a wide range of applications.

[0079] In another preferred embodiment, the buffer part 4 in the above embodiment can be connected to the outlet of a septic tank or the outlets of multiple septic tanks and / or the sewage branch pipe 10. The storage space of the buffer part 4 is designed according to the amount of sewage generated by the catchment area corresponding to the septic tank and the sewage branch pipe 10 connected thereto, and the design is reasonable, and the resources are allocated and merged.

[0080] Further preferably, the drainage system also includes a control system, and the control system includes a first monitoring device and a controller. The first monitoring device is connected to the controller signal, and the first monitoring device is used to monitor the rainfall signal. The controller is used to control the hydraulic switch action of the first outlet, the second outlet, the third outlet, and the fourth outlet according to the rainfall signal. The first monitoring device in this embodiment is at least one of a device for monitoring the liquid level of a water body, a device for monitoring the water quality of a water body, a device for monitoring the rainfall, and a device for monitoring the total amount of water. Correspondingly, the rainfall signal is at least one of a water level signal, a water quality signal, a rainfall signal, and a total amount of water signal. Its control logic is as follows: when a sunny signal is detected, the first outlet of the interception part 2 is opened, the third outlet of the diversion facility 3 is opened, and the fourth outlet is closed. The dirty water on sunny days is diverted to the sewage treatment facility 12 in sequence through the first outlet, the combined branch pipe 1, the municipal combined pipe, the diversion facility 3, and the third outlet;

[0081] When a rainy day signal is detected, the first outlet of the interception part 2 is closed, the third outlet of the diversion facility 3 is closed, and the fourth outlet is opened, and the rainwater is diverted to the pipeline or natural water body downstream of the diversion facility 3 through the combined branch pipe 1, the municipal combined pipe, the diversion facility 3, and the fourth outlet. If a second hydraulic switch is set, the second hydraulic switch is turned on at this time, and the domestic sewage flowing out of the septic tank enters the buffer part 4 for storage, and the sewage in the buffer part 4 is sent to the sewage treatment facility 12 when it is sunny or the sewage treatment facility 12 has the capacity to accept it. The separation of rainwater and sewage is achieved upstream of the combined branch pipe 1, and the discharge of domestic sewage on rainy days is delayed. The existing pipe network system does not need to be modified much, and the clean and dirty diversion of the combined branch pipe 1 can be achieved.

[0082] If the rainfall signal in this embodiment is a liquid level signal, the device for monitoring the liquid level of the water body is a liquid level meter, which is arranged in the diversion facility 3. When rainfall occurs, the water level in the diversion facility 3 rises. Therefore, it is possible to determine whether rainfall has occurred by monitoring the liquid level value in the diversion facility 3. The control logic is as follows: a liquid level threshold is set. When the monitored liquid level value is higher than the liquid level threshold, the controller controls the first hydraulic switch near the first outlet to close, and the first outlet is cut off. If a second hydraulic switch is set at the second outlet, the second hydraulic switch is controlled to open, and the second outlet is turned on. At the same time, the third hydraulic switch is closed and the third outlet is closed, and the fourth hydraulic switch is opened and the fourth outlet is opened. Conversely, the controller controls the first hydraulic switch to open, and the first outlet is turned on. If a second hydraulic switch is set at the second outlet, the second hydraulic switch is controlled to close, and the second outlet is cut off. At the same time, the third hydraulic switch is opened and the third outlet is opened, and the fourth hydraulic switch is closed and the fourth outlet is cut off.

[0083] If the rainfall signal in this embodiment is a water quality signal, the device for monitoring the water quality of the water body is a COD sensor, which is arranged in the diversion facility 3. Because the pollutant concentration in the water is higher when there is no rainwater mixed in the diversion facility 3, when rainwater is mixed in, the sewage is diluted and the pollutant concentration is reduced. Therefore, it is possible to judge whether it will rain by monitoring the pollutant concentration value in the diversion facility 3. The specific control logic is as follows: a first pollutant concentration threshold is set. When the monitored pollutant concentration value is lower than the pollutant concentration threshold, the controller controls the first hydraulic switch to close and the first outlet to be cut off. If the second hydraulic switch is set at the second outlet, the second hydraulic switch is controlled to open and the second outlet is turned on. At the same time, the third hydraulic switch is closed and the third outlet is closed, and the fourth hydraulic switch is opened and the fourth outlet is opened; otherwise, the controller controls the first hydraulic switch to open and the first outlet is turned on. If the second hydraulic switch is set at the second outlet, the second hydraulic switch is controlled to close and the second outlet is cut off. At the same time, the third hydraulic switch is opened and the third outlet is opened, and the fourth hydraulic switch is closed and the fourth outlet is cut off.

[0084] If the rainfall signal in this embodiment is a rainfall signal, the device for monitoring rainfall is a rain gauge, which is generally arranged outside the diversion facility 3. The rain gauge can monitor whether it is raining, and the control logic is as follows: set a rainfall threshold. When the monitored rainfall value is greater than the rainfall threshold, the controller controls the first hydraulic switch to close and the first outlet to be cut off. If a second hydraulic switch is set at the second outlet, the second hydraulic switch is controlled to open and the second outlet is turned on. At the same time, the third hydraulic switch is closed and the third outlet is closed, and the fourth hydraulic switch is opened and the fourth outlet is opened. Conversely, the controller controls the first hydraulic switch to open and the first outlet is turned on. If a second hydraulic switch is set at the second outlet, the second hydraulic switch is controlled to close and the second outlet is cut off. At the same time, the third hydraulic switch is opened and the third outlet is opened, and the fourth hydraulic switch is closed and the fourth outlet is cut off.

[0085] In addition, if the problem of water flow delay or runoff pollution in the pipeline is considered, timers, liquid level meters, COD sensors and other equipment can be set up to combine into rainfall-liquid level method, rainfall-water quality method, rainfall-time method, etc. Taking the rainfall-time method as an example, when the rainfall value is greater than the rainfall threshold, the timing starts, the first hydraulic switch is closed, the third hydraulic switch is opened, and the fourth hydraulic switch is closed. After a delay, the third hydraulic switch is controlled to be closed and the fourth hydraulic switch is opened. By analogy, multiple monitoring devices can be used in combination to achieve precise control of clean and dirty diversion.

[0086] Further preferably, the control system also includes a second monitoring device, which is used to monitor the liquid level height signal in the buffer part 4, and the controller is used to control the hydraulic switch action of the first outlet, the third outlet and the fourth outlet according to the liquid level height signal and the rainfall signal. The second monitoring device provided in this embodiment is a liquid level meter, which is installed in the buffer part 4 to monitor the liquid level height signal of the buffer part 4. Generally, the volume of the buffer part 4 is designed as a reference based on the total amount of sewage generated by its corresponding catchment area during the peak period of sewage generation in the residential area during the three time periods of morning, noon and evening when there is more domestic sewage. The buffer part 4 can be vacated on a sunny day, or it can be vacated after the buffer part 4 is fully stored. The specific control logic is as follows: when the monitored rainfall signal is a sunny day, the first outlet is opened, the third outlet is opened, and the fourth outlet is closed, so that the sewage that continues to enter the intercepting part 2 enters the diversion facility 3 and then enters the sewage treatment facility 12; if it is monitored that the liquid level in the buffer part reaches the set liquid level, the water in the buffer part 4 is pumped out or discharged by gravity into the intercepting part 2, flows out from the first outlet, enters the diversion facility 3, and then enters the sewage treatment facility 12 to empty the buffer part 4.

[0087] Furthermore, the system is also provided with a third monitoring device, which is used for the capacity in the sewage treatment facility. The controller controls the action of the first, third and fourth hydraulic switches according to the rainfall signal and the capacity signal monitored in the sewage treatment facility. The control logic is similar to the logic of Example 5 and can be deduced by analogy; when the controller can also control the action of the first, third and fourth hydraulic switches according to the rainfall signal, the capacity signal of the buffer part and the capacity signal monitored in the sewage treatment facility, if there is a second hydraulic switch, the action of the second hydraulic switch is also controlled. The specific control logic is as follows: the capacity in the sewage treatment facility monitored by the third monitoring device, the rainfall monitored by the first monitoring device is lower than the set rainfall and the liquid level value of the buffer part 4 monitored by the second monitoring device reaches the set capacity and the third monitoring device monitors that the sewage treatment facility has capacity, the first and third hydraulic switches are opened, the first and third outlets are opened, the fourth hydraulic switch is closed, the fourth outlet is closed, the buffer part 4 is emptied or partially emptied or the sewage flowing out of the septic tank enters the combined branch pipe 1.

[0088] Further preferably, the system is further provided with a fourth monitoring device for monitoring the rainfall intensity in the unit area, and the controller controls the operation of the water switches of the first outlet, the third outlet and the fourth outlet according to the rainfall signal and the rainfall intensity signal. The specific control logic is as follows: when the rainfall intensity is relatively low, the first and third hydraulic switches are opened, the first and third outlets are opened, the fourth hydraulic switch is closed, and the fourth outlet is closed. The sewage in the sewage branch pipe and the rainwater gathered at the rainwater outlet are mixed in the combined branch pipe and then diverted to the sewage treatment facility by the diversion facility; at this time, the water in the buffer section 4 is also pumped or gravity-discharged into the interception section 2, flows out from the first outlet into the diversion facility 3, and then enters the sewage treatment facility 12 to empty the buffer section 4; when the rainfall intensity is relatively high, the first and third hydraulic switches are closed, the first and third outlets are closed, the fourth hydraulic switch is opened, and the fourth outlet is opened, the sewage branch pipe and the combined pipe are cut off. If a second hydraulic switch is set, the second hydraulic switch is opened, the sewage in the sewage branch pipe enters the buffer section for storage, and the rainwater gathered at the rainwater outlet enters the pipeline or natural water body downstream of the diversion facility through the combined branch pipe, the municipal combined pipe, and the fourth outlet of the diversion facility. The fourth monitoring device in this embodiment is the same device as the first monitoring device, and the rainfall intensity signal is converted from the signal monitored by the first monitoring device. If the first monitoring device is a rain gauge, the rainfall intensity can be converted according to the rainfall monitored by the rain gauge. The fourth monitoring device can also be a separate device, which is set according to actual use requirements. Among them, a large rainfall intensity means that the rainfall intensity is higher than the set rainfall intensity threshold, and a small rainfall intensity means that the rainfall intensity is lower than the set rainfall intensity threshold. Therefore, the size of the rainfall intensity is determined according to the set rainfall intensity threshold, and the setting of the rainfall intensity threshold is determined by the perennial rainfall environment of the unit area and the capacity of the sewage pipe, which is not specifically limited in this embodiment.

[0089] Furthermore, the capacity of the buffer part 4 can be considered to select whether to transfer the buffer part 4 to the sewage treatment facility 12, thereby completely or partially emptying the buffer part 4, so as to meet more situations and reasonably utilize resources.

[0090] In addition, the rainfall intensity of this embodiment can be obtained by monitoring the rainfall, and the specific operation method is as follows:

[0091] Taking rainfall as an example, a first rainfall threshold and a second rainfall threshold are set;

[0092] When the monitored rainfall is higher than the first rainfall threshold, the first outlet is closed, the third outlet is closed, and the fourth outlet is opened; when the liquid level of the buffer 4 is higher than the set liquid level threshold and the rainfall is higher than the first rainfall threshold and lower than the second rainfall threshold, the first outlet is opened, the third outlet is opened, and the fourth outlet is closed, and the sewage flowing out of the septic tank flows out from the first outlet into the diversion facility 3 and then sent to the sewage treatment facility 12 for treatment, thereby reducing the amount of sewage entering the buffer 4. Furthermore, if a second hydraulic switch is set, the second hydraulic switch can be opened, and the water gravity of the buffer 4 enters the interception part 2 and flows out from the first outlet into the diversion facility 3 and then sent to the sewage treatment facility 12. If there is no second hydraulic switch, the buffer 4 can be emptied by pumping, and the pumped water is also sent to the sewage treatment facility 12; if the liquid level of the buffer 4 is higher than the set liquid level threshold and the monitored rainfall value is higher than the second rainfall threshold, the first outlet can be closed, the third outlet can be closed, and the fourth outlet can be opened. The rainfall in this embodiment can also be replaced by other data converted from rainfall, such as rainfall intensity.

[0093] Furthermore, for special circumstances, such as when the buffer 4 has a small capacity and the rainfall period is long, it is necessary to divert the sewage to the sewage treatment facility 12 on rainy days. The first capacity threshold and the second capacity threshold can be set in combination with the capacity of the sewage treatment facility 12 monitored by the third monitoring device.

[0094] If the rain signal is given and the capacity of the buffer 4 is higher than the second capacity threshold and the capacity of the sewage treatment facility 12 is lower than the first capacity threshold, the first outlet of the interception part 2 is opened, the third outlet of the diversion facility 3 is opened, and the fourth outlet is closed, and the dirty water is diverted to the sewage treatment facility 12 through the first outlet, the diversion facility 3, and the third outlet. As a variation, the buffer 4 can be emptied or partially emptied at this time, and the water in the buffer 4 is gravity-flowed or pumped to the interception part 2 through the combined branch pipe 1, the diversion facility 3 and the third outlet to enter the sewage treatment facility 12. It is also possible not to consider the sewage in the buffer 4 flowing out and only reduce the continuous water inflow of the buffer 4. If a second hydraulic switch is set, the second hydraulic switch can be closed, and the first and third hydraulic switches can be opened, and the water flowing out of the septic tank enters the sewage treatment facility 12 through the first outlet, the combined branch pipe 1, the diversion facility 3, and the third outlet.

[0095] Example 7

[0096] This embodiment 7 provides a drainage method for a combined sewer network, using the drainage system based on the municipal road combined sewer network of the above embodiments 1 to 6, specifically including the following control methods:

[0097] Method 1, see Figure 3 As shown,

[0098] Monitor rainfall signals to determine whether it is raining;

[0099] If not, the first outlet of the interception part 2 is opened, the third outlet of the diversion facility 3 is opened, and the fourth outlet is closed, and the dirty water on sunny days is diverted to the sewage treatment plant 12 through the first outlet, the combined branch pipe 1, the municipal combined pipe, and the third outlet of the diversion facility 3;

[0100] If so, the first outlet of the interception part 2 is closed, the third outlet of the diversion facility 3 is closed, and the fourth outlet is opened, and the clean water is diverted to the natural water body or the pipeline 13 downstream of the diversion facility 3 through the combined branch pipe, the municipal combined pipe, and the fourth outlet of the diversion facility 3. At this time, if a second hydraulic switch is set, the second hydraulic switch is opened, and the domestic sewage flowing out of the septic tank enters the buffer part 4 for storage, and the sewage in the buffer part 4 is sent to the sewage treatment plant 12 when it is sunny or the sewage treatment plant 12 has the capacity to accept it. The separation of rainwater and sewage is achieved upstream of the combined branch pipe 1, and the discharge of domestic sewage on rainy days is delayed. The modification of the existing pipe network system is not large, and the clean and dirty diversion of the combined branch pipe 1 can be achieved.

[0101] Method 2, see Figure 4 As shown,

[0102] On the basis of method 1, after rainfall is detected, the rainfall intensity signal is further monitored to determine whether the rainfall intensity is greater than the set rainfall intensity;

[0103] If not, the first outlet of the intercepting part 2 is opened, the third outlet of the diversion facility 3 is opened, and the fourth outlet is closed, and the dirty water in the sewage branch pipe is diverted to the sewage treatment plant 12 through the first outlet, the combined branch pipe 1, the diversion facility 3, and the third outlet; preferably, the water in the buffer part 4 is gravity-drained or pumped into the intercepting part 2;

[0104] If yes, the first outlet of the interception part 2 is closed, the third outlet of the diversion facility 3 is closed, and the fourth outlet is opened, and the clean water is diverted to the natural water body or the pipeline 13 downstream of the diversion facility through the diversion facility 3 and the fourth outlet. At this time, if a second hydraulic switch is set, the second hydraulic switch is opened, and the domestic sewage flowing out of the septic tank enters the buffer part 4 for storage.

[0105] This method 2 is suitable for situations where the capacity of sewage branch pipes or buffer sections is limited. When the rainfall intensity is low, as much space as possible should be freed up to provide safety guarantees for subsequent system operations.

[0106] Method 3, see Figure 5 As shown,

[0107] On the basis of method 2, when the monitored rainfall intensity is lower than the set rainfall intensity, further monitor whether the sewage treatment plant has capacity;

[0108] If not, the first outlet of the interception part 2 is closed, the third outlet of the diversion facility 3 is closed, and the fourth outlet is opened, and the clean water is diverted to the natural water body or the pipeline 13 downstream of the diversion facility through the combined branch pipe, the municipal combined pipe, the diversion facility 3, and the fourth outlet. At this time, if a second water switch is set, the second water switch is opened, and the domestic sewage flowing out of the septic tank enters the buffer part 4 for storage;

[0109] If so, the first outlet of the intercepting part 2 is opened, the third outlet of the diversion facility 3 is opened, and the fourth outlet is closed. The dirty water on sunny days is diverted to the sewage treatment plant 12 through the first outlet, the combined branch pipe 1, the municipal combined pipe, the diversion facility 3, and the third outlet; preferably, the water in the buffer part 4 is discharged into the intercepting part 2 by gravity or pump.

[0110] This method three further ensures the safety of pipe network drainage, comprehensively considers that the pipe network system can operate effectively, and empties or partially empties the sewage branch pipe or buffer section when the sewage treatment plant has capacity and the rainfall intensity is small, thereby preserving the water storage capacity and having a higher safety factor.

[0111] Method 4, see Figure 6 As shown,

[0112] On the basis of method 2, when the rainfall intensity is detected to be lower than the set rainfall intensity, the buffer is further monitored to see whether it has capacity;

[0113] If not, the first outlet of the intercepting part 2 is opened, the third outlet of the diversion facility 3 is opened, and the fourth outlet is closed. The dirty water in the sewage branch pipe is diverted to the sewage treatment plant 12 through the first outlet, the combined branch pipe 1, the municipal combined pipe, and the third outlet of the diversion facility 3. The purpose is to reduce the water inflow into the buffer part and reserve the volume of the buffer part; as a preferred embodiment, the water in the buffer part 4 can be gravity-drained or pumped into the intercepting part 2 at this time, and part of it is emptied;

[0114] If yes, the first outlet of the interception part 2 is closed, the third outlet of the diversion facility 3 is closed, and the fourth outlet is opened, and the clean water in the combined branch pipe is diverted to the natural water body or the pipeline 13 downstream of the diversion facility through the combined branch pipe, the municipal combined pipe, and the fourth outlet of the diversion facility 3. At this time, if a second water switch is set, the second water switch is opened, and the domestic sewage flowing out of the septic tank enters the buffer part 4 for storage.

[0115] This method four takes into account the actual operation conditions in combination with rainfall intensity and interception capacity, and further aims to preserve space for sewage branches and buffers, continue to maintain water storage capacity, and not build larger buffers, thus making rational use of resources.

[0116] Method 5, see Figure 7 As shown,

[0117] On the basis of method 4, if it is detected that the buffer has no capacity, further monitor whether the sewage treatment facility has capacity;

[0118] If the sewage treatment plant has capacity, the first outlet of the intercepting part 2 is opened, the third outlet of the diversion facility 3 is opened, and the fourth outlet is closed. The dirty water in the sewage branch pipe is diverted to the sewage treatment plant 12 through the first outlet, the combined branch pipe 1, the municipal combined pipe, and the third outlet of the diversion facility 3. The purpose is to reduce the water inflow into the buffer part and reserve the volume of the buffer part; as a preferred embodiment, the water in the buffer part 4 can be discharged by gravity or pumped into the intercepting part 2 at this time, and part of it can be emptied;

[0119] If there is no flow in the sewage treatment facility, the first outlet of the interception part 2 is closed, the third outlet of the diversion facility 3 is closed, and the fourth outlet is opened to divert the clean water in the combined branch pipe through the municipal combined pipe and the fourth outlet of the diversion facility 3 to the natural water body or the pipeline 13 downstream of the diversion facility.

[0120] This method five combines the capacity of the pipe network and the buffer section, ensuring the safety of the pipe network drainage system while maintaining the subsequent water storage capacity of the buffer section, controlling relatively confluence and providing high safety.

[0121] Method 6, see Figure 8 As shown,

[0122] Based on method 1, rainfall is detected and further monitored to see whether the rainfall signal reaches the set rainfall signal threshold.

[0123] If no, the first outlet of the interception part 2 is closed, the third hydraulic switch of the diversion facility is opened, the fourth outlet is opened, the fourth hydraulic switch is closed, the fourth outlet is closed, and the initial rainwater in the combined branch pipe is diverted to the sewage treatment plant or the initial rain storage tank or the rainwater treatment facility through the municipal reasonable pipe and the third outlet of the diversion facility;

[0124] If yes, close the first outlet of the interception part 2, close the third hydraulic switch of the diversion facility, close the third outlet, open the fourth hydraulic switch, open the fourth outlet, and divert the middle and late rainwater in the combined branch pipe to the natural water body or the pipeline downstream of the diversion facility through the municipal combined pipe and the fourth outlet of the diversion facility.

[0125] Method 7, see Fig. 9 As shown,

[0126] On the basis of method 7, if the monitored rainfall signal does not reach the set rainfall signal threshold, further monitoring is performed to see if the sewage treatment plant has capacity.

[0127] If not, the first outlet of the interception part 2 will be closed, the third hydraulic switch of the diversion facility will be closed, the third outlet will be closed, the fourth hydraulic switch will be opened, the fourth outlet will be opened, and the initial rainwater in the combined branch pipe will be diverted to the natural water body or the pipeline downstream of the diversion facility through the municipal combined pipe and the fourth outlet of the diversion facility.

[0128] If yes, close the first outlet of the interception part 2, open the third hydraulic switch of the diversion facility, open the fourth outlet, close the fourth hydraulic switch, close the fourth outlet, and divert the initial rainwater in the combined branch pipe to the sewage treatment plant through the municipal combined pipe and the third outlet of the diversion facility.

[0129] In the above methods six and seven, considering the problem of runoff pollution, the initial rainwater is diverted to the sewage treatment plant, and the mid- and late-stage rainwater is diverted to the natural water body or the pipeline downstream of the diversion facility. Whether it is initial rainwater or mid- and late-stage rainwater can be judged according to the liquid level method, water quality method, rainfall method, total amount method, time method and other methods. No specific limitation is made in this embodiment, and it is not limited to the division by rainfall time. The monitored rainfall signal is a liquid level signal, a water quality signal, a rainfall signal, a time signal, etc. The "monitored rainfall signal reaches the set rainfall signal threshold" in the above method can correspond to a water quality signal, and the water quality data is converted into an inverse to meet the conditions. Other conditions can also be set to meet the identification of initial rainwater and mid- and late-stage rainwater, and the corresponding diversion.

[0130] The equipment for monitoring the capacity of the sewage treatment facility 12 involved in embodiments 1 to 7 may be a liquid level meter, which is installed in the sewage treatment facility 12. A sewage pipe liquid level threshold is set. If the monitored liquid level value is lower than the sewage pipe liquid level threshold, it can be considered that the sewage treatment facility 12 still has capacity. Otherwise, the sewage treatment facility 12 has no capacity.

[0131] For those skilled in the art, the hydraulic switches in Examples 1 to 7 may be gates, weir gates, valves, gate valves, air bags, air pillows, pipe clamp valves or flexible intercepting devices, and may be any device that can achieve the opening or closing of an outlet.

[0132] For those skilled in the art, the water switch being turned on in the embodiments 1 to 7 means that water flows through the water switch, and correspondingly, the water switch being turned off means that no water flows through the water switch.

[0133] For those skilled in the art, the monitoring equipment, controller and other electrical components used in Examples 1 to 7 do not specifically limit the models of the electrical components in this embodiment. Please refer to the selection manual of the corresponding equipment for selection in actual application.

[0134] For those skilled in the art, the higher or lower than used in the control logic of embodiments 1 to 7 may or may not include the present number, and is specifically set according to programming requirements.

[0135] For those skilled in the art, the thresholds set in Examples 1 to 7, such as the water quality concentration threshold, can be direct data (implementation monitoring data) or indirect data (the inverse of the data converted by the converter), as long as the corresponding operational purpose can be met.

[0136] Those skilled in the art may make various modifications and variations to the embodiments of the present invention. If these modifications and variations are within the scope of the claims of the present invention and their equivalents, these modifications and variations are also within the protection scope of the present invention.

[0137] The contents not described in detail in the specification are prior art known to those skilled in the art.

Claims

1. A drainage system based on a municipal road combined sewer network, characterized in that: include: A combined branch pipe (1), along which sewage branch pipes (10) and rainwater inlets (11) in the unit area are respectively connected; The intercepting portion (2) is arranged near the connection point where the sewage branch pipe (10) connects to the combined branch pipe (1) or upstream of the connection point, the intercepting portion (2) having an inlet and a first outlet, the inlet being connected to the sewage branch pipe (10), the first outlet being connected to the combined branch pipe (1), and a first hydraulic switch being arranged to control water flow through the first outlet; a buffer portion (4), the intercepting portion (2) being provided with a second outlet, the buffer portion (4) being connected to the second outlet, the buffer portion (4) being used to store sewage flowing out of the sewage branch pipe (10) on rainy days; A diversion facility (3) is arranged on a municipal combined pipe (13), the diversion facility (3) having an inlet, a third outlet and a fourth outlet, the inlet of the diversion facility (3) being connected to the combined branch pipe (1), the third outlet being connected to a sewage treatment facility (12), and the fourth outlet being connected to a pipeline or a natural water body downstream of the diversion facility (3), and the diversion facility (3) being located downstream of the combined branch pipe (1), the sewage branch pipe (10) and the rainwater inlet (11), the diversion facility (3) also having a hydraulic switch for controlling water flow through the third outlet and the fourth outlet respectively, and the diversion facility (3) being used to divert dirty water to the sewage treatment facility (12) and to divert clean water to a pipeline or a natural water body downstream of the diversion facility (3); The interception part (2) is a diversion well, an interception well, a discarding well, a buffer gallery or an installation well; the buffer part (4) is a pool structure or a tank structure with a storage space, and a hydraulic switch for controlling water flow through the second outlet is provided near the second outlet; The invention also includes a control system, wherein the control system includes a first monitoring device and a controller, wherein the first monitoring device is connected to the controller by signal; the controller is used to control the action of the first water switch of the first outlet according to the rainfall signal; The control system further comprises a third monitoring device, the third monitoring device being used to monitor a capacity signal of the sewage treatment facility (12) and transmit the capacity signal to the controller; The control system further comprises a second monitoring device, the second monitoring device being connected to the controller signal, the second monitoring device being used to monitor a liquid level height signal in the buffer portion (4).

2. A drainage system based on a municipal road combined sewer network as claimed in claim 1, characterized in that: include: A sewage receiving facility is provided between the sewage branch pipe (10) and the intercepting portion (2), and an inlet of the intercepting portion (2) is connected to an outlet of the sewage receiving facility.

3. The drainage system based on the municipal road combined sewer network according to claim 1, characterized in that: When the first monitoring device is at least one of a device for monitoring the liquid level of a water body, a device for monitoring the water quality of a water body, a device for monitoring the rainfall, and a device for monitoring the total amount of water; Correspondingly, the rainfall signal is at least one of a water body level signal, a water body water quality signal, a rainfall signal, and a water body total amount signal.

4. The drainage system based on the municipal road combined sewer network as claimed in claim 2, characterized in that: The number of the sewage branch pipe (10) is one, the number of the intercepting portion (2) is one, and a sewage receiving facility is provided between the sewage branch pipe (10) and the intercepting portion (2), and the inlet of the intercepting portion (2) is connected to the outlet of the sewage receiving facility; or, The number of the sewage branch pipes (10) is plural, the number of the intercepting parts (2) and the number of the sewage receiving facilities are both compatible with the number of the sewage branch pipes (10), and a corresponding sewage receiving facility is provided between each of the sewage branch pipes (10) and a corresponding intercepting part (2), and the inlet of each intercepting part (2) is connected to the outlet of a corresponding sewage receiving facility; or, The number of the sewage branch pipes (10) is several, the number of the intercepting parts (2) is matched to the number of the sewage receiving facilities, and the number of the intercepting parts (2) or the number of the sewage receiving facilities is less than the number of the sewage branch pipes (10), a part of the sewage branch pipes (10) among the several sewage branch pipes (10) is connected to a corresponding one of the intercepting parts (2) through a sewage receiving facility, and each of the sewage branch pipes (10) among the remaining part of the sewage branch pipes (10) is connected to a corresponding one of the intercepting parts (2) through a corresponding one of the sewage receiving facilities.

5. A drainage method for a combined sewer network, characterized in that: Applicable to the drainage system according to any one of claims 1 to 4, specifically as follows: When a clear weather signal is detected, the first outlet of the intercepting portion (2) is opened, the third outlet of the diversion facility (3) is opened, and the fourth outlet is closed, and the dirty water is diverted to the sewage treatment facility (12) through the first outlet, the combined branch pipe (1), the municipal combined pipe (13), and the third outlet of the diversion facility (3); When a rainy day signal is detected, the first outlet of the intercepting portion (2) is closed and the second outlet is opened, and the sewage in the sewage branch pipe (10) enters the buffer portion (4) for storage; the third outlet of the diversion facility (3) is closed and the fourth outlet is opened, and the water flowing in from the rainwater outlet (11) is gathered into the combined branch pipe (1) and diverted to the downstream of the diversion facility (3) through the municipal combined pipe (13), the diversion facility (3), and the fourth outlet; Also monitoring the capacity of the sewage treatment facility (12), setting the sewage treatment facility capacity threshold as a first capacity threshold, monitoring the capacity of the buffer section (4), and setting a second capacity threshold of the buffer section (4); When a rainy day signal is received and the monitored capacity of the sewage treatment facility (12) is lower than a first capacity threshold and the monitored capacity of the buffer section (4) is higher than a second capacity threshold, the first outlet of the interception section (2) is opened, the third outlet of the diversion facility (3) is opened, and the fourth outlet is closed, and the dirty water is mixed with the rainwater flowing into the combined branch pipe (1) from the rainwater outlet (11) and then flows into the sewage treatment facility (12) through the municipal combined pipe (13) and the third outlet of the diversion facility (3); When a rainy day signal is given and the capacity of the monitored sewage treatment facility (12) is higher than a first capacity threshold, the first outlet of the interception portion (2) is closed, the third outlet of the diversion facility (3) is closed, and the fourth outlet is opened, so that rainwater from the rainwater outlet (11) flows into the combined branch pipe (1) through the municipal combined pipe (13) and the fourth outlet of the diversion facility (3) and flows into the pipeline or natural water body downstream of the diversion facility (3).

6. A drainage method for a combined sewer network as claimed in claim 5, characterized in that: Other water body signals are also monitored and signal thresholds are set; When a rainy day signal is generated and the monitored water body signal is lower than a signal threshold, the first outlet of the interception portion (2) is opened or closed, the third outlet of the diversion facility (3) is opened, and the fourth outlet is closed, and the dirty water is diverted to the sewage treatment facility (12) through the combined branch pipe (1), the municipal combined pipe (13), and the third outlet of the diversion facility (3); When a rainy day signal is generated and the monitored water body signal value is higher than the signal threshold, the first outlet of the interception part (2) is closed, the third outlet of the diversion facility (3) is closed, and the fourth outlet is opened, so that rainwater flowing out of the rainwater outlet is collected into the combined branch pipe (1) and diverted through the municipal combined pipe and the fourth outlet of the diversion facility (3) to the pipeline or natural water body downstream of the diversion facility (3); The signal threshold is one of a rainfall time threshold, a liquid level threshold, a flow rate threshold or a pollutant concentration threshold. Correspondingly, the other monitored water body signals are a rainfall time signal, a water body liquid level signal in the diversion facility (3), a flow rate signal in the combined branch pipe (1), and a pollutant concentration signal in the water in the diversion facility (3).

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