A safety risk assessment system and calculation method for urban water supply networks

Abstract

The present application relates to the field of urban pipe network safety assessment, and in particular to an urban water supply pipe network safety risk assessment system and an assessment calculation method, which includes a native recording module, a history recording module, a patrol and maintenance module, an assessment calculation module, and a display module; the native recording module stores the pipe diameter, pipe material, and completion date of the water supply pipe network; the history recording module stores the acceptance data of each assessment, on-site investigation data, and historical damage and repair information of the interval pipe; the patrol and maintenance module stores the patrol data of the assessor; the assessment calculation module calculates the risk occurrence score value of the water supply pipe; the display module displays the above calculation results; and the display module displays the internal storage data of the native recording module, the history recording module, and the patrol and maintenance module. The present invention has the effect of improving the data collection efficiency of the water supply pipe network risk and the accuracy of the safety risk assessment.

Description

Technical Field

[0001] The present application relates to the field of urban pipe network safety assessment, and in particular to an urban water supply pipe network safety risk assessment system and an assessment calculation method. Background Art

[0002] Urban pipe network is a pipeline system used to transport various media in the city, including water supply pipe network, drainage pipe network, gas pipe network, heat pipe network, power and communication pipeline, etc. These pipe network systems are an important part of urban infrastructure and play a vital role in ensuring the normal operation of the city and the lives of residents.

[0003] With the increase in population and the improvement of urban construction level, the urban pipeline network is intricate, especially the overall number of water supply pipelines is huge and accounts for a high proportion. However, some pipelines were laid a long time ago. The immature technology at that time made the pipelines backward and aging, resulting in frequent pipe damage incidents, causing serious economic losses and social impacts. At present, due to the different management methods of each area within the city, the construction of the water supply pipeline network uses pipeline materials of different calibers, different pipes, and different production batches. The regional environment, road construction and other factors have different effects on the degree of damage to different pipeline materials. Simply relying on a unified pipeline safety risk assessment method has a certain regional subjectivity and is difficult to accurately assess. Therefore, for regular pipeline maintenance and risk assessment, the assessors use data acquisition equipment to gradually take samples and collect data according to the region.

[0004] In view of the above-mentioned related technologies, in order to achieve the corresponding refined governance and safe urban construction goals, the urban water supply network urgently needs to build a scientific risk assessment system and method to ensure the safe operation management needs of the water supply network.

[0005] Application Contents In order to improve the data collection efficiency of water supply network risks and the accuracy of safety risk assessment, the present invention provides a city water supply network safety risk assessment system and an assessment calculation method.

[0006] On the one hand, the present invention provides a city water supply network safety risk assessment system that adopts the following technical solutions: a city water supply network safety risk assessment system and an assessment calculation method, including a native recording module, a history recording module, an inspection and maintenance module, an assessment calculation module, and a display module; The native record module internally stores physical property information of the water supply network such as pipe diameter, pipe material, and completion date; The historical record module stores detailed progress and data information of multiple historical assessments, including acceptance data and field survey data of each assessment; it also includes historical damage and repair information of interval pipelines; The inspection and maintenance module internally stores the inspection data of the assessor; The evaluation and calculation module is connected to the native recording module, the historical record module, and the inspection and maintenance module, retrieves and integrates the existing stored data of the native recording module, the historical record module, and the inspection and maintenance module, and calculates the risk occurrence score value of the water supply pipeline through the evaluation and calculation method; The display module is connected to the evaluation and calculation module to display the calculation results of the evaluation and calculation module; the display module is connected to the native recording module, the historical record module, and the inspection and maintenance module to display the internal storage data of the native recording module, the historical record module, and the inspection and maintenance module.

[0007] By adopting the above technical solution, the primary record module, historical record module, and patrol and maintenance module store the main information of the single assessment safety risk of the water supply pipeline. Among them, the primary record module stores the main material and installation information of the pipeline when it is installed, such as the pipe network topology, pipe diameter, completion date, etc. The assessor can know the connection relationship between the water supply pipes based on the pipe network topology. When assessing the pipe life in the pre-taken interval, the assessor can intercept the pipe data in the adjacent interval or with a connection relationship as a reference. The assessor can intuitively understand the ideal service life of the pipe based on the pipe diameter. The assessor uses the completion date as the time reference to understand the time when the pipe is put into use. The historical assessment process and detailed data information recorded in the history module are manually filled in by the assessors after each regular assessment, and are important reference data for subsequent multiple pipeline safety risk assessments; The inspection data recorded in the inspection and maintenance module are inspection data when the water supply pipeline is put into normal use, in addition to the pipeline assessment data. In addition to regular safety risk assessment, the urban water supply network also needs to be routinely inspected by relevant safety inspectors to ensure the normal implementation of the water supply network. After the routine inspection, the safety inspectors need to enter the normal operation of the interval pipelines and the visual aging degree into the inspection and maintenance module. If there is abnormal aging or pipeline damage, the safety inspectors should report it in time; The evaluation calculation module stores calculation instruction files internally, connects to the native recording module, history record module, and patrol and maintenance module, and calculates the security assessment value through the stored data of the native recording module, history record module, and patrol and maintenance module according to the instructions of the assessor during a single security risk assessment cycle.

[0008] Optionally, a regional information module is also included; The regional information module stores environmental information data of regional water supply pipelines, including soil cover depth, road grade, soil moisture, and soil strength of the regional water supply pipelines; The regional information module is connected to the evaluation and calculation module, and the evaluation and calculation module retrieves the storage data of the regional information module; the display module is connected to the regional information module and displays the storage data inside the regional module.

[0009] By adopting the above technical solution, the regional information module mainly records the environment around the system, such as the regional environment and road grade above the water supply network, so that the assessor can directly understand the application scenario of the soil where the water supply network is located in the area, such as the cover depth, and the assessor can clearly locate the depth of the water supply network; Optionally, it also includes an operation and maintenance record module; The operation and maintenance record module internally stores normal operation and maintenance data of the water supply pipeline, including water supply pressure and water supply flow rate; The operation and maintenance record module is connected to the evaluation and calculation module, and the evaluation and calculation module retrieves the storage data of the operation and maintenance record module; the display module is connected to the operation and maintenance record module to display the storage data inside the operation and maintenance record module.

[0010] By adopting the above technical solution, the operation and maintenance record module maintains real-time monitoring of the water flow and water pressure of the water supply pipeline. The water flow and water pressure in each section should be kept within the normal range. When the water flow or water pressure is too small, it means that the pipeline in the area is leaking and damaged. The operation and maintenance record module can also store water quality information in the water supply pipe, which can be inquired by relevant personnel from the water supply bureau during the pipeline safety risk assessment. After the pipeline safety risk assessment, the water quality test results will be written into the operation and maintenance record module, which can be retrieved by assessors of subsequent pipeline safety risk assessments. Water quality information can also be measured by photoelectric methods. Photoelectric sensors are set to detect the transmittance of water flow. Turbid water is an important cause of congestion in water supply pipes. Therefore, water quality testing is important data for estimating the service life of water supply pipes.

[0011] Optionally, an operation control module is also included; The operation control module provides a channel for the assessor to input instructions. The operation control module is connected to the native recording module, the history recording module, the inspection and maintenance module, the assessment and calculation module, and the operation and maintenance recording module to retrieve data from any module and any time period; The operation control module is connected to the evaluation and calculation module to fit and calculate the selected data.

[0012] By adopting the above technical solution, the operation control module is used for the assessor to specifically control the safety risk assessment system. In a single safety risk assessment system, the assessor specifically enters relevant instructions through the operation control module to retrieve part or all of the pipeline information in the above native recording module, a single or all information recorded in the history recording module, the pipeline normal operation statistical record in the inspection and maintenance module, and the water flow transportation information of the water supply pipeline in any time period in the operation and maintenance record module; or, after the information is retrieved, the assessor operates the assessment calculation module to calculate and fit the data of any interval segment, and selects the display form through the operation control module; In summary, the above-mentioned calling, calculating, and fitting instructions are all performed through the operation control module.

[0013] Optionally, an external coordination module is also included; The external coordination module is used for external communication and transmission of external system data and related instructions required for water supply pipeline safety risk assessment.

[0014] By adopting the above technical solution, the external coordination module is used for assessors to retrieve data outside the system, enhance assessors' understanding of pipeline safety risks, and expand assessors' access to the system; Specifically, the evaluation and calculation module should provide an interface for connecting to the external coordination module. The external coordination module can be connected to the system according to the needs of the assessor. When the data retrieved by the external coordination module needs to be brought into the system for calculation, the evaluation and calculation module should be connected. The assessor directly inputs the retrieved data into the evaluation and calculation module through the operation module and issues calculation and fitting instructions, and uses the data of the external coordination module as the basis for pipeline safety risk assessment. If the assessor only retrieves data from the external coordination module for reference and has no calculation requirements, there is no need to connect the evaluation and calculation module. The evaluation and calculation module should be able to remotely connect to the internal system of the water supply company or water conservancy bureau, and have the authority to retrieve the completion acceptance data of the water supply network, network archive information, distribution of buildings along the pipeline, nearby construction conditions, etc.

[0015] Optionally, a wireless module is also included; The wireless module is connected to the external coordination module and is used for communication and data transmission between the external coordination module and a module outside the system; The wireless module is used for information transmission between the native recording module, the historical record module, the inspection and maintenance module, the display module, the regional information module, the operation and maintenance recording module and the evaluation and calculation module; The wireless module is used for transmitting instructions between the operation control module and the evaluation and calculation module.

[0016] By adopting the above technical solution, the above wireless modules should correspond to the native recording module, historical record module, inspection and maintenance module, display module, regional information module, operation and maintenance recording module, and evaluation and calculation module for integrated settings, and be used for data transmission or remote transmission of instructions between the above modules; under technical requirements, the evaluation and calculation module should be integrated into the server of the municipal bureau or water supply company. Therefore, in the field evaluation, it is necessary to maintain a remote connection with the evaluation and calculation module to obtain the evaluation and fitting results in real time; The wireless module is also used to transmit remote commands to the operation control module, allowing the evaluator to directly operate remotely, send data retrieval commands to the native recording module, history recording module, patrol and maintenance module, regional information module, and operation and maintenance recording module, retrieve data stored internally in multiple modules, send control commands to the display module to display the required data and fitting results, and send calculation commands to the evaluation calculation module to complete the calculation of the data.

[0017] Optionally, an alarm module is also included; The alarm module is connected to the wireless module, and is connected to the evaluation and calculation module through the wireless module, and the alarm module issues an alarm when the calculation result of the evaluation and calculation module is abnormal; The alarm module is connected to the operation and maintenance recording module. When there is an abnormality in the water supply data recorded by the operation and maintenance recording module, the alarm module sends out an alarm.

[0018] By adopting the above technical solution, the alarm module and the operation and maintenance recording module are directly connected and instantly accessible. The operation and maintenance recording module is mainly used to detect water pressure and water flow. When the operation and maintenance recording module records abnormal water pressure and water flow, the alarm module sends a command through the wireless module to notify the evaluator or notify the terminal management personnel through the wireless module to perform immediate maintenance to ensure residents' water supply.

[0019] Optionally, it also includes an information service platform; The information service platform is connected to the wireless module, the native recording module, the historical record module, the inspection and maintenance module, the regional information module, and the operation and maintenance recording module, and stores all collected data in the cloud to build a data display platform. The assessors can log in to the display platform remotely and in real time through the mobile terminal.

[0020] By adopting the above technical solutions, the information service platform has built a platform for storing data and real-time retrieval and display of information for the native record module, history module, inspection and maintenance module, regional information module, and operation and maintenance record module. The assessors log in to the information service platform through the mobile terminal, which provides convenience in the pipeline safety risk assessment process; The information service platform and the evaluation and calculation module are connected via a wireless module. Evaluators can retrieve the settlement and fitting results of the evaluation and calculation module through the information service platform and use them whenever they want.

[0021] On the other hand, the present application provides a method for evaluating and calculating the safety risk of a city water supply network, comprising the following steps: A method for evaluating and calculating the safety risk of a city water supply network, characterized in that it comprises: The recorded information of pipe diameter, measured pipe diameter, pipe age, soil cover depth, pipe network leakage rate, pipe material, road grade in the paving area, road type in the paving area, and number of historical pipe damages were retrieved to make 8 groups of scores for the water supply network. The score values ​​were added together, and the score values ​​were positively correlated with the possibility of safety risks in the water supply network. Also includes: The number of users of the regional water supply network and the number of pipe connections in the regional water supply network are retrieved, and the scoring values ​​are added together. The scoring values ​​are positively correlated with the impact after the occurrence of water supply network safety risks.

[0022] By adopting the above steps, a total of 8 measurement dimensions, including pipe diameter, pipe age, soil cover depth, pipe network leakage rate, pipe material, road grade in the paving area, road type in the paving area, and number of historical pipe losses, are closely related to the service life of the pipeline. The size of the pipe diameter is closely related to its structural strength and stress bearing capacity; pipe age refers to the length of use. The pipe wall and pipe connection structure with a longer pipe age are prone to aging; soil cover depth is related to the impact of the ground on it. The greater the soil cover depth, the longer its service life; the road grade and road type in the paving area represent the road vehicle commuting rate in the paving area. The service life of the water supply network at large intersections is significantly shorter than that of the water supply network under the green belt and pedestrian path; therefore, the above 8 sets of data are comprehensively evaluated and a scoring system (rating system) is adopted to accurately estimate the possibility of safety risks; Secondly, the number of water supply network users and the number of pipeline connections in the area represent the impact of the water supply network, that is, the magnitude of the impact when the water supply network is damaged. For areas with large impacts, technical personnel should pay more attention and give priority to regular risk assessments of pipelines.

[0023] The risk probability and risk consequence are combined through matrix method or weighted average method to obtain the risk score. The higher the score, the higher the pipeline risk level. In summary, the present application includes at least one of the following beneficial technical effects: 1. Through the comprehensive application of native recording module, historical record module, inspection and maintenance module and evaluation and calculation module, the comprehensive collection and analysis of physical property information, historical evaluation data and inspection data of water supply network is realized, which significantly improves the accuracy and reliability of risk assessment; 2. The evaluation and calculation module can retrieve and comprehensively process data from various modules in real time, and timely calculate the risk score of the water supply pipeline, effectively improving the accuracy and timeliness of water supply network safety monitoring; 3. The display module integrates and displays the results of the evaluation calculation module and the storage data of each module, which facilitates the evaluators to efficiently obtain and analyze information, and enhances the scientific nature of decision-making and management efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a system logic block diagram of an embodiment of the present application.

[0025] Figure 2 It is a "bathtub curve" diagram of the life cycle of the pipe age in the embodiment of the present application.

[0026] Explanation of the accompanying drawings: 1. Native recording module; 2. History recording module; 3. Regional information module; 4. Operation and maintenance recording module; 5. Inspection and maintenance module; 6. Wireless module; 7. Display module; 8. Evaluation and calculation module; 81. External coordination module; 82. Operation control module; 83. Alarm module; 84. Information service platform. DETAILED DESCRIPTION

[0027] The following is combined with Figure 1-2 This application is described in further detail.

[0028] First, the embodiment of the present application discloses a system for assessing the safety risk of urban water supply networks. Figure 1 A city water supply network safety risk assessment system and assessment calculation method include a native recording module 1, a history recording module 2, a regional information module 3, an operation and maintenance recording module 4, an inspection and maintenance module 5, a wireless module 6, an assessment and calculation module 8, an alarm module 83, a display module 7, an external coordination module 81, an operation control module 82, and an information service platform 84.

[0029] The native record module 1 stores the physical property information of the water supply network, such as the diameter, pipe material, and completion date, which are written by the management personnel when the water supply network is laid. The historical record module 2 stores the detailed process and detailed data information of multiple historical assessments, including the acceptance data of each assessment, the on-site investigation data, the estimated remaining life of the interval pipeline, the service life of the interval pipeline, and the historical damage and maintenance information of the interval pipeline, which are written by the assessors after each pipeline safety risk assessment. The inspection and maintenance module 5 stores the inspection data of the assessors, mainly including the specific situation information written by the inspectors during routine inspections, such as the normal operation of the interval pipeline and the visual aging degree. The regional information module 3 stores the environmental information data of the regional water supply pipeline, including the soil cover depth and road grade of the water supply pipeline in the region. The operation and maintenance record module 4 stores the normal operation and maintenance data of the water supply pipeline, including the water supply pressure, water supply flow rate, and water supply quality.

[0030] The above-mentioned native recording module 1, history recording module 2, regional information module 3, operation and maintenance recording module 4, and inspection and maintenance module 5 serve as information recording modules of the water supply network safety risk assessment system, which count all the information required for the pipeline safety assessment process and are specifically retrieved by the assessors.

[0031] Reference Figure 1 The evaluation and calculation module 8 is connected to the above-mentioned native recording module 1, historical record module 2, regional information module 3, operation and maintenance recording module 4, and inspection and maintenance module 5, and integrates, calculates, and analyzes the information of the above-mentioned five modules used for information data recording to obtain the results.

[0032] Specifically, the urban water supply network safety risk assessment should adopt a quantitative method, and the results should include the estimation of the possibility of risk occurrence, the estimation of risk consequences and their combination. The estimation of the possibility of risk occurrence in the above-mentioned assessment calculation module 8 is calculated according to the following formula: Among them, Pof is the risk probability score value, which is rounded up according to the calculated value; Pi is the evaluation index parameter score value in the risk probability calculation, and the evaluator scores each evaluation index parameter and then brings it into the calculation; Ii is the weight corresponding to Pi, and n is the number of risk probability estimation index parameters; each evaluation index includes pipe material, pipe diameter, pipe age, road grade, cover depth, regional environment, soil strength (or soil corrosion), influence of adjacent overlapping pipelines, disturbance of adjacent overlapping pipelines, damage to the pipeline network, historical events, pipeline pressure stability, pipeline pressure amplitude, and all or part of the indicators in the operation and maintenance cycle. These indicators are all recorded by the above-mentioned native recording module 1, historical record module 2, regional information module 3, operation and maintenance recording module 4, and inspection and maintenance module 5.

[0033] The risk consequence estimation of the above evaluation and calculation module 8 is calculated according to the following formula: Among them, Pof is the score value of the risk consequence, which is rounded up according to the calculated value; Cj is the score value of the evaluation index parameter in the risk consequence calculation; Ij is the weight corresponding to Ci, and n is the number of risk probability estimation index parameters. Each scoring index includes the number of water users, laying area, pipe network reliability, pipe network leakage, water accumulation in roads and surrounding areas, and the duration of service suspension caused by water supply terminals. The above-mentioned water accumulation in roads and surrounding areas can be recorded by the regional information module 3, the pipe network leakage can be recorded by the historical record module 2, and the remaining indicators need to be evaluated by the external coordination module 81.

[0034] After calculating the risk probability estimate and risk consequence estimate, it is necessary to use the above two sets of data results to derive the risk assessment level R to make the data more intuitive. In practical applications, the risk level is generally divided into five levels. The higher the level value, the higher the pipeline risk.

[0035] R = f(P of , C of ) Reference Figure 1 , the external coordination module 81 is used for external communication, transmitting the system-external data and related instructions required for the water supply pipeline safety risk assessment. Specifically, the evaluation and calculation module 8 should be able to remotely connect to the system within the water supply company or the water conservancy bureau, and have the authority to retrieve the completion acceptance data of the water supply network pipeline, the network archives, the distribution of buildings along the pipeline, and the adjacent construction conditions, that is, the number of users of the above-mentioned water supply, the laying area, the reliability of the network, and the length of time that the water supply terminal causes the service to stop. The evaluation and calculation module 8 should provide an interface. When the data retrieved by the external coordination module 81 needs to be brought into the system for calculation, the evaluation and calculation module 8 should be connected. The assessor directly inputs the retrieved data into the evaluation and calculation module 8 through the operation module and issues calculation and fitting instructions, using the data of the external coordination module 81 as the basis for the pipeline safety risk assessment; if the assessor only retrieves data through the external coordination module 81 for reference and has no calculation requirements, there is no need to connect the evaluation and calculation module 8.

[0036] Reference Figure 1 The above-mentioned instructions for assessors to retrieve information are carried out through the operation control module 82. The operation control module 82 provides a channel for assessors to enter instructions, connects the native recording module 1, the history module 2, the inspection and maintenance module 5, the assessment calculation module 8, and the operation and maintenance recording module 4, and retrieves data from any module and any time period. In actual applications, the operation control module 82 needs to provide a key for entering instructions, and the assessors issue corresponding instructions through the operation keys.

[0037] Reference Figure 1The external coordination module 81 is used for assessors to retrieve collected data outside the safety risk assessment system of this embodiment, and is specifically used for wireless access to the internal system of the water supply bureau or the municipal bureau. The external coordination module 81 has the authority to connect to the internal system interface of the water supply bureau and the municipal bureau to retrieve data to enhance the assessors' understanding of pipeline safety risks and expand the assessors' data acquisition channels.

[0038] Reference Figure 1 , the wireless module 6 is connected to the external coordination module 81, and the communication between the external coordination module 81 and the water supply bureau or municipal bureau system outside the system of this embodiment is carried out through the wireless module 6; the wireless module 6 corresponding to the external coordination module 81 is preferably a 4 / 5G wireless communication module. The wireless module 6 is set corresponding to the native recording module 1, the historical record module 2, the inspection and maintenance module 5, the regional information module 3, and the operation and maintenance record module 4, and is used for wireless transmission of information of the above five modules; the wireless module 6 is set corresponding to the evaluation and calculation module 8, so that the evaluation and calculation module 8 is remotely connected to the native recording module 1, the historical record module 2, the inspection and maintenance module 5, the regional information module 3, and the operation and maintenance record module 4 to realize the instant transmission of instructions and data; the wireless module 6 corresponding to the native recording module 1, the historical record module 2, the inspection and maintenance module 5, the regional information module 3, the operation and maintenance record module 4, and the evaluation and calculation module 8 is preferably a 4 / 5G wireless communication module. In the case of a short distance in the same area, the zigbee wireless transmission module is preferably used. The wireless module 6 in this embodiment does not recommend the use of WiFi and Bluetooth modules.

[0039] Reference Figure 1 The display module 7 should be set in the control terminal for data display, and is connected to the native recording module 1, the history module 2, the inspection and maintenance module 5, the regional information module 3, the operation and maintenance recording module 4 through the wireless module 6, and is directly connected to the evaluation and calculation module 8, so that the evaluator or the terminal manager can retrieve the internally stored data information and instruction process in real time or remotely.

[0040] Reference Figure 1 The alarm module 83 has remote transmission capability, that is, it is set one by one corresponding to the wireless module 6. The alarm module 83 is integrated in the terminal control end and remotely connected to the evaluation and calculation module 8 through the wireless module 6. When there is an abnormality in the data calculation of the evaluation and calculation module 8, the alarm module 83 issues an alarm, so that the terminal control personnel can obtain the situation in real time; the alarm module 83 is directly connected to the operation and maintenance recording module 4 through the wireless module 6, and receives the abnormal signal issued by the operation and maintenance recording module 4. When there is an abnormality in the water supply data information detected in real time by the operation and maintenance recording module 4, the alarm module 83 receives the signal remotely and immediately and issues an alarm.

[0041] Reference Figure 1In order to further improve the work efficiency of the assessors, a cloud server for data storage, namely, an information service platform 84, is provided in the system of this embodiment. The cloud server is connected to the mobile terminal via the wireless module 6, so that the assessors can obtain data information through the mobile device with wireless network communication function during the urban water supply network safety risk assessment process. Specifically, the cloud server is remotely connected to the native recording module 1, the history module 2, the inspection and maintenance module 5, the regional information module 3, the operation and maintenance recording module 4, and the assessment calculation module 8. The assessors can remotely log in to the information service platform 84, enter the password to obtain the authority, and can arbitrarily retrieve the data information and instruction process stored in the platform.

[0042] The implementation principle of a city water supply network safety risk assessment system in an embodiment of the present application is as follows: the native recording module 1, the historical record module 2, the regional information module 3, the operation and maintenance record module 4, and the inspection and maintenance module 5 are data information collection and storage units, which collect data information related to the water supply network as the basis for the network safety risk assessment, and upload it to the information service platform 84 through the wireless module 6. The assessor can log in to the information service platform 84 through the mobile terminal to obtain the data.

[0043] At the same time, under specific needs, the evaluation and calculation module 8 is connected to the native recording module 1, the history recording module 2, the regional information module 3, the operation and maintenance recording module 4, and the inspection and maintenance module 5, retrieves the stored data and calculates and fits it, so that the evaluator can understand it intuitively.

[0044] Additionally, in combination with the above-mentioned urban water supply network safety risk assessment system, the embodiment of the present application discloses an evaluation and calculation method for water supply network safety risk assessment. An evaluation and calculation method for water supply network safety risk assessment can start from the dimensions of multiple water supply network composition architectures. Specifically, the above-mentioned risk occurrence possible indicators can be comprehensively considered from the dimensions of pipe diameter, pipe age, pipe material, soil cover depth, road grade, regional environment, pipe network leakage rate, and historical events; risk consequence indicator optimization can be comprehensively analyzed from the dimensions of the number of affected users, laying area, and pipe network reliability.

[0045] Risk Occurrence Possibility Indicator Rating: Pipe Diameter: From practical experience, we know that the smaller the pipe diameter, the thinner the pipe wall. On the one hand, the impact of corrosion on it is greater than that on pipes with larger diameters and thicker walls. Therefore, thinner pipes are more likely to fail due to corrosion; thinner pipe walls have relatively poor bearing capacity under the same load and ground movement, and are more sensitive to nearby construction activities, making the pipeline more fragile and increasing the possibility of failure. It is recommended that the score value gradually decreases as the pipe diameter increases.

[0046] Age: Reference Figure 2The life cycle of commonly used pipelines can be represented by a "bathtub curve", that is, the failure rate changes with the use time and is divided into three stages: early failure period, accidental failure period and wear and tear failure period: the first stage is the initial stage of burial, when the pipeline has been put into use for a short time, and pipeline accidents are mainly caused by the pipe itself or the quality of pipeline construction. Although pipeline accidents occur from time to time in this stage, the accident rate will gradually decrease after repair because it has just been put into use; the second stage is that the pipeline operation is relatively stable, and the performance of the pipeline is relatively ideal in this stage. Accidents in this stage are mainly caused by human damage or the pipeline is subjected to heavy loads, and the accident rate is relatively low; as the service life of the pipeline continues to increase, the life cycle enters the third stage. At this stage, the pipeline gradually ages and degrades, so the frequency of accidents increases.

[0047] Considering the above bathtub curve, the pipe damage accidents in the first stage are mainly caused by the pipe itself or the quality of pipeline construction. The accidents in this stage are not related to pipeline degradation, and certain management measures such as pipe selection and construction quality control can be used to avoid pipe damage in this stage. In addition, the longer the pipeline is laid, the more pipe damage will occur due to pipe aging. It is recommended that the pipe age scoring rule only considers the pipeline network safety issues caused by the aging of the pipeline network due to the increase in pipe age. Most studies have also shown that this law is an objective and effective law of pipeline network aging.

[0048] Tube: Gray cast iron in pipes: It is cheap and commonly used, but due to its production process and other factors, it has certain manufacturing defects, is brittle and has low strength. The main reason for its failure is its poor corrosion resistance. It is not suitable for working under conditions of excessive pressure inside the pipe or heavy load outside the pipe. It is a backward pipe. A high score is recommended.

[0049] Asbestos cement: As asbestos has a significant impact on the environment and human health, it is a backward pipe material and a high score is recommended.

[0050] Ductile iron pipe: Ductile iron pipe has better toughness, ductility, impact resistance, seismic resistance, and corrosion resistance than other pipes. It is resistant to bending and folding and has good adaptability to complex underground environments. The annual pipe loss rate of ductile iron pipe is only 1.37 per 100 kilometers. A low score is recommended.

[0051] Steel pipe: Although it is prone to corrosion, it has high strength, can withstand high pressure, has good hydraulic conditions, low failure rate, better corrosion resistance and higher safety; a lower score is recommended.

[0052] Cover depth: As the buried depth of the pipeline increases, the impact of ground vehicle load and temperature load on the pipeline decreases, and its pipe loss rate basically shows a downward trend. It is recommended that the score value decreases as the cover depth increases.

[0053] Road Grade: Different road grades mean different road vehicle loads on water supply pipelines. For the same pipeline with the same buried depth, the load on a high-grade road is greater, making the pipeline stress state more dangerous. It is recommended that the higher the road grade, the higher the score.

[0054] Regional environment: There is no vehicle load or a small vehicle load in green belts and sidewalks, so a low score is recommended; the superimposed effect of vehicle loads from different directions at traffic intersections has a more serious disruptive effect on the water supply network, so a high score is recommended.

[0055] Pipeline network leakage rate: According to relevant regulations, the leakage rate of urban public water supply pipelines across the country should gradually decrease. In order to adapt to the gradual reduction of the pipeline leakage rate, it is recommended that the indicator score value of the pipeline leakage rate of the pipeline operation and maintenance status gradually decreases as the pipeline leakage rate decreases.

[0056] Historical Events: Historical events are important evaluation indicators, and the historical events are reclassified. The more times they occur, the higher the score.

[0057] Risk consequence indicator score: Affected users: The calculation of the number of users affected takes into account the sudden pressure drop in the pipeline caused by the open pipe burst, which affects the water consumption of users; on the other hand, it takes into account the pressure drop or water outage caused to users due to the structure of the pipeline network after the valve of the pipeline is closed during the emergency repair. The higher the number of users affected, the higher the score. Pipeline network reliability: If the water supply network is redundant and has a ring network and a multi-way water supply network topology, then after an accident occurs in one section of the pipeline, its water supply function can be replaced by other pipelines, so the consequences are not serious and the value is small, and vice versa. Considering that there is no ring network and the risk consequences caused by the regional water supply trunk pipeline damage event, the score value should be the highest.

[0058] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A city water supply network safety risk assessment system, characterized by: It includes a native recording module (1), a history recording module (2), an inspection and maintenance module (5), an evaluation and calculation module (8), and a display module (7); The native recording module (1) internally stores physical property information of the water supply network such as pipe diameter, pipe material, and completion date; The historical record module (2) internally stores detailed processes and data information of multiple historical assessments, including acceptance data and on-site survey data of each assessment; it also includes historical damage and repair information of the interval pipeline; The inspection and maintenance module (5) internally stores the inspection data of the assessor; The evaluation and calculation module (8) is connected to the original recording module (1), the historical record module (2), and the inspection and maintenance module (5), retrieves and integrates the existing stored data of the original recording module (1), the historical record module (2), and the inspection and maintenance module (5), and calculates the risk occurrence score value of the water supply pipeline; The display module (7) is connected to the evaluation and calculation module (8) to display the calculation results of the evaluation and calculation module (8); the display module (7) is connected to the native recording module (1), the historical record module (2), and the inspection and maintenance module (5) to display the internal storage data of the native recording module (1), the historical record module (2), and the inspection and maintenance module (5).

2. The urban water supply network safety risk assessment system according to claim 1, characterized in that: Also includes a regional information module (3); The regional information module (3) internally stores environmental information data of the regional water supply pipeline, including the soil cover depth, road grade, soil moisture, and soil strength of the regional water supply pipeline; The regional information module (3) is connected to the evaluation and calculation module (8), and the evaluation and calculation module (8) retrieves the stored data of the regional information module (3); the display module (7) is connected to the regional information module (3) and displays the stored data inside the regional module.

3. The urban water supply network safety risk assessment system according to claim 1, characterized in that: It also includes an operation and maintenance record module (4); The operation and maintenance recording module (4) internally stores normal operation and maintenance data of the water supply pipeline, including water supply pressure and water supply flow rate; The operation and maintenance record module (4) is connected to the evaluation and calculation module (8), and the evaluation and calculation module (8) retrieves the stored data of the operation and maintenance record module (4); the display module (7) is connected to the operation and maintenance record module (4) to display the stored data inside the operation and maintenance record module (4).

4. The urban water supply network safety risk assessment system according to claim 3 is characterized in that: Also included is an operation control module (82); The operation control module (82) provides a channel for the assessor to input instructions. The operation control module (82) is connected to the native recording module (1), the history recording module (2), the inspection and maintenance module (5), the assessment and calculation module (8), and the operation and maintenance recording module (4) to retrieve data from any module and any time period; The operation control module (82) is connected to the evaluation calculation module (8) to fit and calculate the selected data.

5. The urban water supply network safety risk assessment system according to claim 4 is characterized in that: Also included is an external coordination module (81); The external coordination module (81) is used for external communication and for transmitting external system data and related instructions required for water supply pipeline safety risk assessment.

6. A city water supply network safety risk assessment system according to claim 5, characterized in that: Also includes a wireless module (6); The wireless module (6) is connected to the external coordination module (81) and is used for communication and data transmission between the external coordination module (81) and a module outside the system; The wireless module (6) is used for information transmission between the native recording module (1), the history recording module (2), the inspection and maintenance module (5), the display module (7), the area information module (3), the operation and maintenance recording module (4) and the evaluation and calculation module (8); The wireless module (6) is used for transmitting instructions between the operation control module (82) and the evaluation and calculation module (8).

7. The urban water supply network safety risk assessment system according to claim 1 is characterized by: Also includes an alarm module (83); The alarm module (83) is connected to the wireless module (6), and is connected to the evaluation and calculation module (8) through the wireless module (6), and when the calculation result of the evaluation and calculation module (8) is abnormal, the alarm module (83) issues an alarm; The alarm module (83) is connected to the operation and maintenance recording module (4), and when the water supply data recorded by the operation and maintenance recording module (4) is abnormal, the alarm module (83) issues an alarm.

8. The urban water supply network safety risk assessment system and assessment calculation method according to claim 1 is characterized by: It also includes information service platform (84); The information service platform (84) is connected to the wireless module (6), the native recording module (1), the historical record module (2), the inspection and maintenance module (5), the regional information module (3), and the operation and maintenance recording module (4), and stores all collected data in the cloud to build a data display platform. The assessors can log in to the display platform remotely and in real time through the mobile terminal.

9. A method for evaluating and calculating the safety risk of a city water supply network, characterized in that: include: The water supply network was scored by taking the recorded information of pipe diameter, pipe age, soil cover depth, pipe network leakage rate, pipe material, road grade in the paving area, road type in the paving area, and number of historical pipe damage. The score values ​​were added together, and the score values ​​were positively correlated with the possibility of safety risks in the water supply network. Also includes: The number of users of the regional water supply network, the location of the network, and the number of pipe connections in the regional water supply network are retrieved, and the scoring values ​​are added together. The scoring values ​​are positively correlated with the impact after the occurrence of water supply network safety risks.

10. The risk probability and risk consequences are combined through matrix method or weighted average method to obtain the risk score value. The higher the score value, the higher the pipeline risk level.

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