Pipe network problem troubleshooting method based on online monitoring indexes of key nodes of sewage pipe network

Abstract

The invention relates to the field of municipal sewage pipe networks, and discloses a sewage pipe network key node on-line monitoring index-based pipe network problem troubleshooting method, which comprises the steps of basic data collection, pipeline data information integration, and informatization integration of pipeline topology information and elevation data. Making a dynamic flow diagram of a pipe network, and making the dynamic flow diagram of the pipe network according to the elevation data and a field investigation result; a monitoring scheme and drainage partitions are formulated, monitoring points with high practicability, representativeness and feasibility are selected according to a pipeline flow direction relation graph and a monitoring point layout principle, and diagnosis partitions are divided according to the monitoring points; checking the monitoring data, wherein the checking comprises flow checking, liquid level checking and water quality calibration. Technical breakthrough is made in the aspect of pipe network troubleshooting, the risk troubleshooting range can be narrowed through information integration, data analysis and problem diagnosis, problem types and nodes can be diagnosed, the efficiency of urban pipeline troubleshooting is improved, and important practical value is brought to urban drainage pipe network troubleshooting work.

Description

Technical Field

[0001] The invention relates to the field of municipal sewage pipe networks, and in particular to a method for troubleshooting pipe network problems based on online monitoring indicators of key nodes of the sewage pipe network. Background Art

[0002] Municipal sewage pipe networks are a core component of urban infrastructure. They are responsible for the effective transportation and discharge of sewage, and are essential for maintaining urban environmental sanitation and the public health of residents. With the acceleration of my country's urbanization process, the structure of the drainage pipe network is becoming increasingly complex, and the troubleshooting of pipe network problems is becoming more difficult. If the pipes are not maintained for a long time, problems such as direct discharge of sewage, backflow of river and lake water, groundwater infiltration, and overflow of sewage wells may occur, seriously affecting the sustainable development of the city. Therefore, timely detection of pipeline problems and maintenance and management of sewage pipe networks are the key to solving urban pipe network problems and ensuring the healthy development of cities.

[0003] At present, the monitoring technologies used to inspect sewage pipe networks mostly include closed-circuit monitoring (CCTV), periscope monitoring (QV) and sonar detection. Comprehensive inspections of large-scale sewage pipe network systems are not only costly and labor-intensive, but also inefficient, and the judgment of various pipeline problems is not accurate enough. Summary of the invention

[0004] The main purpose of the present invention is to solve the technical problem that the determination of various pipeline problems in the prior art is not accurate enough. A pipeline problem troubleshooting method based on online monitoring indicators of key nodes of a sewage pipeline network comprises:

[0005] Basic data collection, including data collection and preparation and on-site investigation steps, collecting basic data of the pipeline network, obtaining information on pipeline location distribution, pipe diameter, and pipeline flow direction, determining the flow direction of the main pipeline and the fulcrum merging into the main pipeline, and obtaining pipeline topology information and elevation data;

[0006] Pipeline data information integration, which integrates pipeline topology information and elevation data; pipeline network dynamic flow diagram production, which produces pipeline network dynamic flow diagram based on elevation data and on-site survey results;

[0007] Formulate monitoring plans and drainage zones, select monitoring points with high practicality, representativeness and feasibility according to pipeline flow relationship diagram and monitoring point layout principles, and divide diagnostic zones according to monitoring points;

[0008] Monitoring data verification, including flow verification, liquid level verification and water quality calibration:

[0009] Flow verification: By comparing the monitoring data of consecutive days, observe whether the daily average change pattern of the data is consistent;

[0010] Liquid level verification: The liquid level monitoring data of the pipe network is verified by the box plot method, that is, the basic principle of the box plot is used to perform statistics on the monitoring data and identify abnormal parameters;

[0011] Water quality calibration: Based on the changes in continuous monitoring data, observe whether the daily average change pattern of the data is consistent.

[0012] The pipe network problem troubleshooting method also includes drainage pipe network tracing:

[0013] Start from the sewage lifting pump or the front end of the sewage treatment plant in the drainage area, follow the principle of primary first and secondary later, and gradually trace back to the upstream nodes. The node water quality monitoring indicator is COD. According to the background value survey of the drainage area, the COD concentration reference value is determined to be P. First, trace upward from the node in the front end of the sewage lifting pump. The COD of node A is greater than P, and the COD of node B is greater than P. Therefore, it is necessary to continue tracing upward. The COD of node C is greater than P. There are two branches tracing upward from point C. The key nodes of the two branches are traced respectively. If the COD of node D is less than P, there is no need to continue tracing, which indicates that there is a problem of mixed connection of rainwater and sewage in this section of the pipe; if the COD of node EA is greater than P, continue to trace upward, among which node B is downstream of node A, node C is downstream of node B, and node D and node E are both downstream of node C.

[0014] The pipe network problem troubleshooting method also includes infiltration and inflow diagnosis:

[0015] The determination of infiltration is based on the following principles: the flow rate in the sewage pipe section increases significantly on rainy days or when the river water level increases; the sewage water quality concentration of the sewage pipe on rainy days is low; the COD water quality indicator of the adjacent pipe section decreases too much, and there is suspected external water intrusion; the buried depth of the pipe section is lower than the groundwater and river water levels, and there is a risk of external water intrusion; the overall concentration of the pipe section does not change significantly after the drainage household water is discharged, and the drainage household drainage water quality concentration may be abnormal.

[0016] The pipe network problem troubleshooting method also includes external water intrusion calculation: introducing water quality characteristic indicators, and establishing an equation to calculate external water intrusion according to the law of conservation of matter:

[0017] Q w =Q F +Q E

[0018]

[0019] Where: Q W Indicates the actual sewage volume (m 3 / d); Q F Indicates the amount of raw sewage (m 3 / d); Q E Indicates the amount of external water intrusion (m 3 / d); CW Indicates the concentration of water quality characteristic indicators in actual sewage; C F is the concentration of water quality characteristic index in raw sewage; C E It is the concentration of characteristic water quality indicators in the invaded external water.

[0020] The pipe network problem troubleshooting method also includes calculating groundwater infiltration, and the groundwater infiltration is calculated using the following formula:

[0021] Q 入渗 =e 0.8002ΔH+0.19463

[0022] Where: Q 入渗 is the groundwater infiltration, unit: m 3 km -1 ·d -1 ; ΔH is the difference between the groundwater level and the bottom of the pipe, in meters. The above formula greatly improves the accuracy of the groundwater infiltration meter. Compared with the existing calculation method, the error of this algorithm is reduced by 54%.

[0023] The pipe network problem troubleshooting method also includes water quality index determination:

[0024] According to the differences between sewage and water quality indicators of different water bodies, water quality indicators that characterize different types of water bodies are determined. The principles for determining water quality indicators are:

[0025] a. The concentration should be significantly different in different types of external water sources; b. The concentration should be similar in the same type of external water sources; c. Basically no physical, chemical or biological reactions occur; d. It should have good detection limit, repeatability and sensitivity.

[0026] The present invention also relates to a sewage pipe network problem troubleshooting system based on online monitoring indicators of key nodes of the sewage pipe network, comprising:

[0027] Basic data collection unit, including data collection and preparation and on-site investigation steps, collecting basic data of the pipeline network, obtaining pipeline location distribution, pipe diameter, pipeline flow direction information, determining the flow direction of the main pipeline and the fulcrum merging into the main pipeline, and obtaining pipeline topology information and elevation data;

[0028] The pipeline data information integration unit integrates the pipeline topology information and elevation data; the pipeline network dynamic flow map production unit produces the pipeline network dynamic flow map based on the elevation data and the results of the on-site survey;

[0029] Formulate monitoring plans and drainage zoning units, select monitoring points with high practicality, representativeness and feasibility according to the pipeline flow relationship diagram and monitoring point layout principles, and divide diagnostic zones according to the monitoring points;

[0030] Monitoring data calibration unit, including flow calibration unit, liquid level calibration unit and water quality calibration unit:

[0031] Flow verification unit: By comparing the monitoring data of consecutive days, observe whether the daily average change pattern of the data is consistent;

[0032] Liquid level verification unit: Verify the liquid level monitoring data of the pipe network through the box plot method, that is, use the basic principle of the box plot to perform statistics on the monitoring data and identify abnormal parameters;

[0033] Water quality calibration unit: Based on the changes in continuous monitoring data, observe whether the daily average change pattern of the data is consistent.

[0034] The present invention has the following beneficial effects:

[0035] By integrating the basic information of pipelines, creating a dynamic pipeline flow map, dividing the drainage area according to the pipeline flow direction, and then analyzing the online monitoring data of key nodes, narrowing the scope of key problem investigation in the pipeline network, and conducting judgments on infiltration and inflow, calculating the proportion of external water intrusion, fast and accurate data analysis points out the direction for the investigation of problems in the drainage area pipeline network, avoiding ineffective work, narrowing the scope of investigation, reducing the investment in manpower and financial resources for pipeline network investigation, quickly and effectively locking in risk areas, and improving investigation efficiency.

[0036] By integrating the basic information of pipelines, it is easy to integrate complex and diverse pipeline data, and to digitize and graph basic information, which provides convenience for pipeline data analysis, key node selection, and problem area locking. After the basic data is integrated, it is easy for managers to obtain, modify and manage multi-source information, which also provides an important guarantee for the subsequent maintenance and improvement of the pipeline network.

[0037] The present invention has achieved a technological breakthrough in the troubleshooting of pipe network problems. It can narrow the scope of risk investigation through information integration, data analysis, and problem diagnosis, diagnose problem types and nodes, improve the efficiency of urban pipeline problem investigation, and bring important practical value to the investigation of urban drainage pipe networks. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 The present invention is a flow chart of the method for troubleshooting mixed rainwater and sewage connections based on online monitoring of key nodes in the sewage pipe network.

[0039] Figure 2 This is a diagram of the source tracing method for mixed connections in sewage pipe networks. DETAILED DESCRIPTION

[0040] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "including" or "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0041] The purpose of the present invention is to provide a method for troubleshooting pipe network problems based on online monitoring indicators of sewage pipe networks, identify key areas of mixed rainwater and sewage in drainage areas, facilitate pipeline troubleshooting, and timely maintain the health of urban sewage pipe network systems. Figure 1 , the first embodiment comprises:

[0042] The purpose of the present invention is to provide a method for troubleshooting pipe network problems based on online monitoring indicators of sewage pipe networks, determine key areas of mixed rainwater and sewage in drainage areas, provide convenience for pipeline troubleshooting, and timely maintain the health of urban sewage pipe network systems.

[0043] The following are general steps on how to implement pipe network problems and troubleshooting methods based on online monitoring indicators of key nodes in the sewage pipe network:

[0044] Step S01: Data collection and preparation, specifically including:

[0045] Pipeline data: collect basic data of pipeline network, pipeline location distribution, pipe diameter, pipeline flow direction, elevation of inspection wells and historical pipeline defect investigation data, etc.;

[0046] Current environmental information: collect current land use maps, distribution maps of important drainage measures, current water quality of regional receiving water bodies, etc.

[0047] Step S02: On-site investigation, specifically including:

[0048] Determine the flow direction of pipelines: determine the flow direction of the main pipeline and the fulcrum merging into the main pipeline;

[0049] Types of drainage households in the area: Conduct on-site surveys of the main types of drainage households in the area, and daily usage conditions of residential buildings and parks;

[0050] Survey on the drainage outlets of the regional drainage network into the river: Survey on the drainage conditions of the main outlets along the river.

[0051] Background value survey of various water bodies, including:

[0052] (1) Surface water: the average value is obtained by sampling the upper, middle and lower reaches of the main rivers in the drainage area;

[0053] (2) Groundwater: The wells used all year round near the main pipes of the drainage area network are used as monitoring wells. The average value is taken by combining the actual measurement and historical monitoring data;

[0054] (3) Domestic sewage and industrial wastewater: Sampling was conducted at the discharge outlets of three types of plots in the region: residential areas, schools and other enterprises and institutions, and industrial areas. Sampling was conducted multiple times and the average values ​​were taken.

[0055] Basic data information processing, including:

[0056] Step S03: Pipeline data information integration: Informatization integration of pipeline topology information and elevation information;

[0057] Step S04: Preparation of a dynamic flow diagram of the pipe network: a dynamic flow diagram of the pipe network is prepared based on the elevation data of the drainage area pipelines and the results of the on-site investigation.

[0058] Step S05: Formulate monitoring plan and drainage zoning:

[0059] According to the pipeline flow relationship diagram and the monitoring point layout principles, select monitoring points with high practicality, representativeness and feasibility, and divide the diagnostic zones according to the monitoring points;

[0060] The layout of monitoring points should cover all diagnostic zones. The specific principles are as follows:

[0061] Principle of practicality: The layout of monitoring points should be centered around the monitoring purpose, and should be reasonably arranged according to the current status and existing problems of the drainage system to avoid excessive redundant data that increases workload;

[0062] The principle of combining decentralization and centralization is adopted: the monitoring points should be located in a way that covers all drainage zones; they should be relatively concentrated in the predictable cause of disease pipe network area;

[0063] Representative principle: The monitoring points should take into account various land uses, drainage types and pipe materials in the drainage area, but the land use type in the area covered by a single monitoring point should be relatively single, so as to measure the drainage patterns of a more representative drainage area.

[0064] Specific feasibility principle: The selection of monitoring points should be convenient and safe for installation and beneficial for subsequent maintenance.

[0065] Divide drainage zones according to pipeline flow direction, try to ensure that each drainage zone is relatively independent and not affected by other drainage zones, and monitor the water discharge status of drainage zones through key nodes;

[0066] The continuous sampling time includes at least one rainfall process, and the rainfall reaches 3mm / h. The rainfall process below this amount is ignored. Continuous monitoring equipment is used at key nodes to automatically monitor water quality results every 15 minutes.

[0067] Step S06: Monitoring data verification

[0068] In the actual monitoring process, due to the monitoring environment and pipe network problems, the sources of monitoring errors are various, mainly including errors in the basic data of the pipe network, errors in the pipe network partitioning, errors in monitoring equipment, and the operating conditions within the pipe network, which will cause large differences in the final monitoring results. Therefore, it is necessary to calibrate the monitoring data of the monitoring equipment in order to conduct subsequent data analysis and problem diagnosis more accurately.

[0069] Flow verification: By comparing the monitoring data of consecutive days, observe whether the daily average change pattern of the data is consistent.

[0070] Liquid level verification: The liquid level monitoring data of the pipe network is verified by the box plot method, that is, the basic principle of the box plot is used to perform statistics on the monitoring data and identify abnormal parameters:

[0071] H=h1-h2

[0072] IQR1=h1+1.5H

[0073] IQR2=h2-1.5H

[0074] In the formula, h1 represents the maximum value within the non-outlier range of this set of data, also known as the upper quartile, m; h2 represents the minimum value within the non-outlier range of this set of data, also known as the lower quartile, m; H represents the difference between the upper quartile and the lower quartile of this set of data, also known as the interquartile range, m.

[0075] Water quality calibration: The calibration of water quality monitoring data is based on the changes in continuous monitoring data to observe whether the daily average change pattern of the data is consistent.

[0076] Step S07: Problem diagnosis

[0077] (1) Drainage network source tracing: Start from the sewage lifting pump or sewage treatment plant in the drainage area, follow the principle of primary first and secondary later, and gradually trace the source to the upstream nodes. The node water quality monitoring indicator is COD. The COD concentration reference value is determined as P based on the background value survey of the drainage area. First, trace the source upward from the node in front of the sewage lifting pump. A>P, B>P, so it is necessary to continue tracing upward, C>P. There are two branches tracing upward from point C. The key nodes of the two branches are traced respectively. If D<P, there is no need to continue tracing, which indicates that there is a problem of mixed connection between rainwater and sewage in this section of the pipe; if E>P, continue tracing upward, and the specific method is as above. The above method can narrow the scope of problem investigation and improve the efficiency of pipeline problem investigation and tracing. See. Figure 2 .

[0078] (2) Infiltration and inflow diagnosis:

[0079] The determination of infiltration and inflow is based on the following principles: the flow rate in the sewage pipe section increases significantly on rainy days or when the river water level increases (rainwater intrusion); the sewage water quality concentration transported by the sewage pipe on rainy days is low (water quality indicators such as COD on rainy days are generally lower than those on sunny days, and rainwater has invaded the sewage pipe section); the COD water quality indicator of the adjacent pipe section decreases too much, and there is suspected external water intrusion; the buried depth of the pipe section is lower than the groundwater and river water levels, and there is a risk of external water intrusion; the overall concentration of the pipe section does not change significantly after the drainage household water is discharged, and the drainage household drainage water quality concentration may be abnormal.

[0080] (3) Calculation of external water intrusion using the water quantity and quality balance method

[0081] External water intrusion is mainly caused by factors such as terrain, pipeline design defects, drainage system or illegal discharge, which leads to a large amount of external water being discharged into the pipeline system, causing adverse effects such as abnormal pipeline water concentration and high water level operation. The chemical properties of water vary depending on the source of the water. Through water quality and quantity monitoring and analysis, the type of external water in the region and the amount of water entering the pipeline network can be estimated.

[0082] Introduce water quality characteristic indicators and establish an equation based on the law of conservation of matter:

[0083] Q w =Q F +Q E

[0084]

[0085] Where: Q W Indicates the actual sewage volume (m 3 / d); Q F Indicates the amount of raw sewage (m 3 / d); Q E Indicates the amount of external water intrusion (m 3 / d); CW Indicates the concentration of water quality characteristic indicators in actual sewage; C F is the concentration of water quality characteristic index in raw sewage; C E It is the concentration of characteristic water quality indicators in the invaded external water.

[0086] External water intrusion analysis:

[0087] ① Groundwater infiltration

[0088] Generally speaking, the higher the groundwater level, the greater the probability of infiltration into the sewage pipe and the greater the amount of infiltration water. The analysis results of the infiltration of newly laid reinforced concrete pipes with a diameter of 1000-1350mm can derive the relationship equation between the water level difference and the amount of groundwater infiltration in the pipe:

[0089] Q 入渗 =e 0.8002ΔH+0.19463

[0090] Where: Q 入渗 is the groundwater infiltration (m 3 km -1 ·d -1 ) ; ΔH is the elevation difference between the groundwater level and the pipe bottom (m);

[0091] ② Determination of water quality indicators of various types of water such as raw sewage, groundwater, river water, etc.

[0092] The key to this method is to determine the appropriate water quality characteristic indicators. Water quality characteristic indicators should have the following characteristics: a. The concentration should have significant differences in different types of external water sources; b. The concentration should be similar in the same type of external water sources; c. It should be relatively stable (basically no physical, chemical, or biological reactions occur); d. It should have good detection limits, repeatability, and sensitivity. From the perspective of monitoring convenience, economy, and feasibility, COD, ammonia nitrogen, and conductivity can be considered as water quality characteristic indicator factors.

[0093] Based on the differences between sewage and water quality indicators of different water bodies, water quality indicators characterizing different types of water bodies are determined, such as using COD as a water quality characteristic factor to characterize groundwater; electrical conductivity is a characteristic factor of groundwater.

[0094] ③3③ Calculation of external water intrusion ratio

[0095] The water quality index at the end of the pipe section represents the actual sewage water quality index concentration, and the sewage source ratio is calculated based on the balance formula.

[0096] The embodiment of the present invention also includes a sewage pipe network problem troubleshooting system based on online monitoring indicators of key nodes of the sewage pipe network, including:

[0097] Basic data collection unit, including data collection and preparation and on-site investigation steps, collecting basic data of the pipeline network, obtaining pipeline location distribution, pipe diameter, pipeline flow direction information, determining the flow direction of the main pipeline and the fulcrum merging into the main pipeline, and obtaining pipeline topology information and elevation data;

[0098] The pipeline data information integration unit integrates pipeline topology information and elevation data;

[0099] The pipeline network dynamic flow diagram production unit produces the pipeline network dynamic flow line diagram based on the elevation data and the results of the on-site investigation;

[0100] Formulate monitoring plans and drainage zoning units, select monitoring points with high practicality, representativeness and feasibility according to the pipeline flow relationship diagram and monitoring point layout principles, and divide diagnostic zones according to the monitoring points;

[0101] Monitoring data calibration unit, including flow calibration unit, liquid level calibration unit and water quality calibration unit:

[0102] Flow verification unit: By comparing the monitoring data of consecutive days, observe whether the daily average change pattern of the data is consistent;

[0103] Liquid level verification unit: Verify the liquid level monitoring data of the pipe network through the box plot method, that is, use the basic principle of the box plot to perform statistics on the monitoring data and identify abnormal parameters;

[0104] Water quality calibration unit: Based on the changes in continuous monitoring data, observe whether the daily average change pattern of the data is consistent.

[0105] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the above-described system, device, or unit can refer to the corresponding process in the aforementioned method embodiment and will not be repeated here.

[0106] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk and other media that can store program codes.

[0107] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for troubleshooting pipe network problems based on online monitoring indicators of key nodes of a sewage pipe network, characterized in that: include: Basic data collection, including data collection and preparation and on-site investigation steps, collecting basic data of the pipeline network, obtaining information on pipeline location distribution, pipe diameter, and pipeline flow direction, determining the flow direction of the main pipeline and the fulcrum merging into the main pipeline, and obtaining pipeline topology information and elevation data; Pipeline data information integration, information integration of pipeline topology information and elevation data; Production of pipeline network dynamic flow direction diagram: based on elevation data and on-site survey results, production of pipeline network dynamic flow direction diagram; Formulate monitoring plans and drainage zones, select monitoring points with high practicality, representativeness and feasibility according to pipeline flow relationship diagram and monitoring point layout principles, and divide diagnostic zones according to monitoring points; Monitoring data verification, including flow verification, liquid level verification and water quality calibration: Flow verification: By comparing the monitoring data of consecutive days, observe whether the daily average change pattern of the data is consistent; Liquid level verification: The liquid level monitoring data of the pipe network is verified by the box plot method, that is, the basic principle of the box plot is used to perform statistics on the monitoring data and identify abnormal parameters; Water quality calibration: Based on the changes in continuous monitoring data, observe whether the daily average change pattern of the data is consistent.

2. A method for troubleshooting sewage pipe network problems based on online monitoring indicators of key nodes of sewage pipe network according to claim 1, characterized in that: The pipe network problem troubleshooting method also includes drainage pipe network tracing: Start from the sewage lifting pump or the front end of the sewage treatment plant in the drainage area, follow the principle of primary first and secondary later, and gradually trace back to the upstream nodes. The node water quality monitoring indicator is COD. According to the background value survey of the drainage area, the COD concentration reference value is determined to be P. First, trace upward from the node in the front end of the sewage lifting pump. The COD of node A is greater than P, and the COD of node B is greater than P. Therefore, it is necessary to continue tracing upward. The COD of node C is greater than P. There are two branches tracing upward from point C. The key nodes of the two branches are traced respectively. If the COD of node D is less than P, there is no need to continue tracing, which indicates that there is a problem of mixed connection of rainwater and sewage in this section of the pipe; if the COD of node EA is greater than P, continue to trace upward, among which node B is downstream of node A, node C is downstream of node B, and node D and node E are both downstream of node C.

3. A method for troubleshooting pipe network problems based on online monitoring indicators of key nodes of a sewage pipe network according to claim 1, characterized in that: The pipe network problem troubleshooting method also includes infiltration and inflow diagnosis: The determination of infiltration is based on the following principles: the flow rate in the sewage pipe section increases significantly on rainy days or when the river water level increases; the sewage water quality concentration of the sewage pipe on rainy days is low; the COD water quality indicator of the adjacent pipe section decreases too much, and there is suspected external water intrusion; the buried depth of the pipe section is lower than the groundwater and river water levels, and there is a risk of external water intrusion; the overall concentration of the pipe section does not change significantly after the drainage household water is discharged, and the drainage household drainage water quality concentration may be abnormal.

4. A method for troubleshooting pipe network problems based on online monitoring indicators of key nodes of a sewage pipe network according to claim 1, characterized in that: The pipe network problem troubleshooting method also includes external water intrusion calculation: introducing water quality characteristic indicators, and establishing an equation to calculate external water intrusion according to the law of conservation of matter: Q w =Q F +Q E Where: Q W Indicates the actual sewage volume (m 3 / d); Q F Indicates the amount of raw sewage (m 3 / d); Q E Indicates the amount of external water intrusion (m 3 / d); C W Indicates the concentration of water quality characteristic indicators in actual sewage; C F is the concentration of water quality characteristic index in raw sewage; C E It is the concentration of characteristic water quality indicators in the invaded external water.

5. A method for troubleshooting pipe network problems based on online monitoring indicators of key nodes of a sewage pipe network according to claim 1, characterized in that: The pipe network problem troubleshooting method also includes calculating groundwater infiltration, and the groundwater infiltration is calculated using the following formula: Q 入渗 =e 0.8002ΔH+0.19463 Where: Q 入渗 is the groundwater infiltration, unit: m 3 km -1 ·d -1 ; ΔH is the elevation difference between the groundwater level and the pipe bottom, unit: m.

6. A method for troubleshooting pipe network problems based on online monitoring indicators of key nodes of a sewage pipe network according to claim 1, characterized in that: The pipe network problem troubleshooting method also includes water quality index determination: According to the differences between sewage and water quality indicators of different water bodies, water quality indicators that characterize different types of water bodies are determined. The principles for determining water quality indicators are: a. The concentration should be significantly different in different types of external water sources; b. The concentration should be similar in the same type of external water sources; c. Basically no physical, chemical or biological reactions occur; d. It should have good detection limit, repeatability and sensitivity.

7. A sewage pipe network problem troubleshooting system based on online monitoring indicators of key nodes of the sewage pipe network, characterized in that: include: Basic data collection unit, including data collection and preparation and on-site investigation steps, collecting basic data of the pipeline network, obtaining information on pipeline location distribution, pipe diameter, and pipeline flow direction, determining the flow direction of the main pipeline and the fulcrum merging into the main pipeline, and obtaining pipeline topology information and elevation data; The pipeline data information integration unit integrates pipeline topology information and elevation data; The pipeline network dynamic flow direction diagram production unit produces the pipeline network dynamic flow direction diagram based on the elevation data and the results of the on-site investigation; Formulate monitoring plans and drainage zoning units, select monitoring points with high practicality, representativeness and feasibility according to the pipeline flow relationship diagram and monitoring point layout principles, and divide diagnostic zones according to the monitoring points; Monitoring data calibration unit, including flow calibration unit, liquid level calibration unit and water quality calibration unit: Flow verification unit: By comparing the monitoring data of consecutive days, observe whether the daily average change pattern of the data is consistent; Liquid level verification unit: Verify the liquid level monitoring data of the pipe network through the box plot method, that is, use the basic principle of the box plot to perform statistics on the monitoring data and identify abnormal parameters; Water quality calibration unit: Based on the changes in continuous monitoring data, observe whether the daily average change pattern of the data is consistent.

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