CN116611809A - Method for determining maintenance order of urban sewage pipeline based on supply and demand balance - Google Patents
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Abstract
The invention discloses a method for determining maintenance priority of an urban sewage pipeline based on supply-demand balance, which comprises the steps of obtaining an actual health degree influence factor library and a failure result influence factor library of the urban sewage pipeline; two independent sewage pipeline evaluation systems are constructed, namely an evaluation system (1) which is a health degree evaluation index system and an evaluation system (2) which is a failure result evaluation index system; according to the corresponding score values of two sets of evaluation systems of each sewage pipeline, matrix multiplication is adopted to combine supply and demand, and two types of unbalanced pipelines are identified; the subareas count the unbalanced pipe ratio of each street in the target area, and identify the street areas with serious unbalance which need urgent attention. The invention identifies two types of unbalanced sewage pipelines through supply and demand combination, and provides a novel development direction for the maintenance priority of urban sewage pipelines. Two sets of independent urban sewage pipeline evaluation systems evaluate the actual health state of each sewage pipeline and the influence generated after failure.
Description
Technical Field
The invention relates to a method for determining maintenance priority of urban sewage pipelines, in particular to a method for identifying unbalanced urban sewage pipelines based on a supply-demand balance theory.
Background
In recent years, with the acceleration of urban level and population proliferation, the urban sewage water load is gradually increased; secondly, the phenomenon of 'heavy construction, light management and light maintenance' of urban drainage pipe networks in China is common, and the problems of structural damage, corrosion, blockage and the like of sewage pipelines are increasingly prominent, so that various operation challenges such as overflow, external water infiltration and the like are caused. At present, most of the repair of pipelines in most cities is passive maintenance after the pipelines are continuously leaked and damaged, so that the repair cost is high and the environment pollution is easy to cause. Furthermore, due to budget cuts and resource allocations inadequacies, municipalities need to develop cost effective methods to maintain and repair municipal sewage pipe network infrastructure. A review of the existing research shows that when the maintenance priority of the pipeline is determined, the supply-demand balance relation between urban sewage pipeline health evaluation and the failure result in space is ignored, so that the invention considers analyzing unbalanced pipelines and provides a new thought for determining the maintenance priority of the urban sewage pipeline.
The distributed giant system (publication number: CN 102739420A) based on the operation management and maintenance of the digital drainage pipe network adopts a technology and a management means, is coupled with a drainage pipe network simulation model and a data analysis method, realizes the digital management of the drainage pipe network, and provides support for the operation and management of the drainage pipe network. However, in actual operation, the data amount and technical level are high, and the influence generated after the failure is not considered when determining and maintaining the pipeline.
Disclosure of Invention
Aiming at the problem of determining the maintenance priority of the urban sewage pipeline, two independent urban sewage pipeline evaluation index systems are constructed based on a supply-demand balance theory, and a comprehensive evaluation method is adopted to determine the supply and demand of the urban sewage pipeline, namely the health status score and the failure result score of the urban sewage pipeline. And determining a supply-demand balance value by a matrix product method according to the scoring condition of an index layer corresponding to the supply and demand of each sewage pipeline, so as to identify two types of unbalanced pipelines. The method for determining the maintenance priority of the urban sewage pipeline by introducing the supply-demand balance theory is strong in feasibility and novel in thought, and as a result, the efficiency of the municipal authorities in the aspect of daily repair and maintenance of the sewage pipeline can be improved.
The technical scheme adopted by the invention is as follows:
a method for determining maintenance order of municipal sewage pipes based on supply and demand balance, comprising the steps of:
step 1: identifying key influence factors related to the actual health state and failure results of the sewage pipeline, and forming an actual health degree influence factor library and a failure result influence factor library of the urban sewage pipeline;
step 2: constructing two sets of sewage pipeline evaluation systems, namely a health degree evaluation index system (an evaluation system (1)) and a failure result evaluation index system (an evaluation system (2)), wherein the two sets of evaluation index systems are mutually independent;
step 3: determining a supply quantity of the municipal sewage pipeline, wherein the evaluation system (1) aims at evaluating the actual health state of the municipal sewage pipeline, and the supply quantity is an actual health state score of the sewage pipeline;
step 4: determining the demand of the urban sewage pipeline, wherein the evaluation system (2) aims at evaluating the consequences and the influence generated after the urban sewage pipeline fails, and the demand is the score of the consequences of the sewage pipeline failure;
step 5: according to the score values of two sets of evaluation systems of each sewage pipeline, calculating a supply-demand balance result by adopting a matrix product method, and identifying two types of unbalanced pipelines;
step 6: in combination with street partitioning within the target area, the area of streets requiring urgent attention is identified by partitioning the statistical unbalanced pipeline occupancy by the balance relationship between sewer supply and demand.
Further, the specific method for constructing the evaluation system (1) in the step 3 of the invention is as follows:
the actual health condition of the urban sewage pipeline is evaluated, and the urban sewage pipeline comprises 25 evaluation indexes in total, namely corrosion, cracking, deformation, dislocation, disjointing, invasion, leakage, mud accumulation, scaling, sundries, water pool, plugging, tree root, pipe diameter, pipe length, pipe age, pipe, gradient, burial depth, load state, flow rate, pipeline function, bearing load, soil type and underground water level.
Further, the specific method for constructing the evaluation system (2) in the step 4 of the invention is as follows:
the social economy, environmental consequences and influence generated after the failure of the urban sewage pipeline are evaluated, wherein the evaluation comprises 9 evaluation indexes in total, namely the distance from a building, the distance from a river, the distance from a park and entertainment facilities, the distance from a degraded rainwater pipeline, the road type, whether the urban sewage pipeline intersects a railway, the regional importance, the distance from a hospital and the distance from a school.
Further, the specific method for identifying two types of unbalanced pipelines in the step 5 is as follows:
the higher the health degree of the sewage pipeline is, the higher the score of the evaluation system (1) is; the higher the sewage pipeline failure result, the higher the score of the evaluation system (2). Two types of unbalanced pipelines can be identified by matrix multiplication, namely, the scores of two sets of evaluation index systems are multiplied. The first type of unbalanced pipelines are low in health degree and high in failure result, and the pipelines need to be repaired and maintained preferentially; the second type of unbalanced pipeline is high in health and low in failure result, and the municipal authorities temporarily do not consider the pipeline under the conditions of budget reduction and insufficient resource allocation.
Further, the specific method for identifying the serious street unbalance area in the step 6 of the invention is as follows:
considering the unbalanced proportion of sewage pipes in each street of a target area, according to pipe length statistics, for example, n sewage pipes in a certain street area are counted, the total pipe length is li (i=1, 2 … n), and the unbalanced pipe length is l Loss of i (wherein i=1, 2 … n), then the street area unbalanced pipe ratio
The beneficial effects of the invention are as follows:
(1) The invention is based on the supply and demand balance theory, and based on the supply and demand of the maintenance demands of the urban sewage pipelines, the supply and demand combination identifies two types of unbalanced sewage pipelines, thereby providing a novel development direction for the maintenance priority of the urban sewage pipelines.
(2) Besides considering the analysis of unbalanced pipelines, the invention constructs two sets of independent urban sewage pipeline evaluation systems, and comprehensively evaluates the actual health state of each sewage pipeline and the influence generated after failure.
Description of the drawings:
the invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a flow chart of a city sewage pipeline supply and demand matching method according to an embodiment of the invention;
FIG. 2 is an example of an urban sewage pipeline evaluation index system according to the present invention;
FIG. 3 is a graph showing the evaluation index weight values according to the embodiment of the present invention;
FIG. 4 is a diagram showing a quantitative index membership function of a municipal sewage pipeline according to an embodiment of the invention;
FIG. 5 shows the spatial distribution of urban sewage pipeline supply in a cold water river basin according to an embodiment of the present invention;
FIG. 6 is a spatial distribution of urban sewage pipeline demand in a cold water river basin according to an embodiment of the present invention;
FIG. 7 is a spatial distribution of supply and demand balance values of urban sewage pipelines in a cold water river basin according to an embodiment of the invention;
FIG. 8 is a statistical diagram of first type unbalanced pipeline partitions of urban sewage in a cold water river basin according to an embodiment of the invention;
FIG. 9 is a chart showing statistics of the second type of unbalanced pipeline sections of urban sewage in a cold water river basin according to an embodiment of the invention.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and all the inventions which make use of the inventive concept are protected by the following claims insofar as various changes are within the spirit and scope of the present invention as defined and defined by the appended claims.
Although the previous researches comprise urban sewage pipeline health evaluation researches (detection technology, multi-index evaluation and the like), urban sewage pipeline risk evaluation researches (failure probability and failure result evaluation), urban sewage pipeline network operation risk researches (key point monitoring, hydraulic model simulation and the like). However, in the comprehensive view, when determining the maintenance priority of the pipeline, the supply and demand balance relation between the sewage pipeline health evaluation and the failure result in space is ignored, and the unbalanced pipeline is considered to be analyzed. In order to remedy the above-mentioned shortcomings, in this embodiment, the maintenance priority of the urban sewage pipeline determined based on the supply-demand balance theory is selected as the object, and fig. 1 shows the flow and technical route related to the method, including the following steps:
step 1: identifying key influence factors related to the actual health state and failure results of the sewage pipeline, and forming an actual health degree influence factor library and a failure result influence factor library of the urban sewage pipeline;
step 2: constructing two sets of sewage pipeline evaluation systems, namely a health degree evaluation index system (an evaluation system (1)) and a failure result evaluation index system (an evaluation system (2)), wherein the two sets of evaluation index systems are mutually independent;
step 3: determining a supply quantity of the municipal sewage pipeline, wherein the evaluation system (1) aims at evaluating the actual health state of the municipal sewage pipeline, and the supply quantity is an actual health state score of the sewage pipeline;
step 4: determining the demand of the urban sewage pipeline, wherein the evaluation system (2) aims at evaluating the consequences and the influence generated after the urban sewage pipeline fails, and the demand is the score of the consequences of the sewage pipeline failure;
step 5: according to the score values of two sets of evaluation systems of each sewage pipeline, calculating a supply-demand balance result by adopting a matrix product method, and identifying two types of unbalanced pipelines;
step 6: in combination with street partitioning within the target area, the area of streets requiring urgent attention is identified by partitioning the statistical unbalanced pipeline occupancy by the balance relationship between sewer supply and demand.
Firstly, identifying relevant influence factors of the actual health state and failure results of the sewage pipeline, and constructing an urban sewage pipeline actual health and failure result evaluation index system; then, determining index weights by adopting an analytic hierarchy process AHP; and finally, obtaining the actual health state score and the failure result score of each sewage pipeline by adopting a fuzzy comprehensive evaluation method FCA, and determining the supply and demand of the maintenance requirements of the urban sewage pipelines.
Referring to fig. 2, an actual health evaluation index system of the municipal sewage pipeline is established, which comprises 25 evaluation indexes in total, namely corrosion, cracking, deformation, dislocation, disjointing, invasion, seepage, mud accumulation, scaling, sundries, water pool, plugging, tree root, pipe diameter, pipe length, pipe age, pipe material, gradient, burial depth, load state, flow rate, pipeline function, bearing load, soil type and underground water level. Determining the weight W of each index by using AHP: based on expert scoring, applying a 1-9 scale method to the same layer element to obtain a comparison scale (a ij ) n×n Constructing a judgment matrix A ij The method comprises the steps of carrying out a first treatment on the surface of the Normalization processing is carried out on the judgment matrix to obtain a weight vector W= (W) j ) n×1 Calculating the maximum eigenvector of the judgment matrix; passing consistency test; the weight value W was calculated by the AHP method, and the result is shown in fig. 3.
Referring to fig. 2, an urban sewage pipeline failure result evaluation index system is established, which comprises 9 evaluation indexes in total, namely a distance from a building, a distance from a river, a distance from a park and amusement facilities, a distance from a deteriorated rainwater pipeline, a road type, whether the road type is intersected with a railway, an area importance, a distance from a hospital and a distance from a school. Similarly, the weight W of each index is determined by using AHP, and the result is shown in fig. 3.
Firstly, determining an index set (shown in figure 2) of an object to be evaluated and a judgment grade domain set { I, II, III, IV, V }, as shown in tables 1 and 2, by adopting a fuzzy comprehensive evaluation FCA method; obtaining a membership matrix R: for quantitative indexes, aiming at the characteristics of each factor, triangle and trapezoid membership functions are adopted to represent membership functions of the most important indexes in branches of each class, such as pipe length, pipe gradient, pipe burial depth and the like (as shown in figure 4); and finally, carrying out fuzzy operation on the membership matrix R and the weight vector set W of the index, and normalizing to obtain a fuzzy comprehensive judgment result set beta.
TABLE 1 actual health evaluation index grading table for urban sewage pipelines
TABLE 2 evaluation index grading table for failure results of urban sewage pipelines
The corresponding evaluation grade sets { I, II, III, IV, V } of the indexes are judged by the expert, the score value set of the corresponding evaluation grade sets is {10,7.5,5,2.5,0}, wherein the lower the score is, the worse the actual health condition of the sewage pipeline is, the higher the failure result is, and the health score S of each sewage pipeline is 1 And failure outcome score S 2 All adopt fuzzy comprehensive judgment result set transposition beta T * A membership matrix R.
S 1 ＝β 1 T *R 1
S 2 ＝β 2 T *R 2
According to the health score S of each sewage pipeline 1 And failure outcome score S 2 Fig. 5 shows a spatial distribution of urban sewage pipe supply in a cold water river, and fig. 6 shows urban sewage pipe demand in a cold water riverHierarchical rendering of supply and demand is a method of determining cut-off values using natural break point hierarchy in Arcgis software, which is a method of finding the best cut-off value for a partitioned dataset by minimizing the standard deviation within the same group and maximizing the inter-group standard deviation.
The higher the health degree of the sewage pipeline is, the higher the score of the evaluation system (1) is; the higher the sewage pipeline failure result, the higher the score of the evaluation system (2). Two sets of evaluation index system scores are multiplied by s=s 1 *S 2 Two types of unbalanced pipes may be identified. Fig. 7 is a spatial distribution of supply and demand balance values of urban sewage pipelines in cold water river basin according to an embodiment of the invention, and a natural break point grading method is still adopted for graded rendering of supply and demand combination scores. The first type of unbalanced pipelines are low in health degree and high in failure result, and the pipelines need to be repaired and maintained preferentially, namely S is located between 13.58 and 47.36, and 6518 pipelines are added in total; the second type of unbalanced pipelines are high in health degree and low in failure result, and under the conditions of budget reduction and insufficient resource allocation, the municipalities don't consider the pipelines temporarily, namely S is between 81.98 and 92.99, and the total number of the pipelines is 2237.
Finally, carrying out partition statistics according to streets in the target area, and counting the ratio of the pipe length of two types of unbalanced pipes in each street area, wherein the total pipe length is li (i=1, 2 … n) and the unbalanced pipe length is l, for example, n sewage pipes in a certain street area are shared Loss of i (where i=1, 2 … n), then the street area unbalance pipe ratioUnbalanced street areas that require urgent attention can be identified. The spatial distribution of the street unbalance degree adopts a natural break point grading method in Arcgis software to determine a cut-off value, and the first and second type unbalance pipeline proportion (counted according to the pipeline length) is shown in fig. 8 and 9.
Claims (7)
1. A method for determining maintenance order of municipal sewage pipelines based on supply-demand balance, characterized by:
the 'supply quantity' is an actual health state score of the urban sewage pipeline;
the "demand" is a score of the sewage pipeline failure result;
the 'supply and demand balance' is to realize the balance analysis of 'supply quantity' and 'demand quantity' through the matching of the health state of the sewage pipeline and the failure result of the sewage pipeline;
the matching is realized by a matrix multiplication method, the 'supply and demand balance' result of the sewage pipeline is obtained by multiplying the actual health score of the same sewage pipeline by the failure result score, and two types of unbalanced pipelines are identified, so that the maintenance order of the sewage pipeline is determined;
n sewage pipes are added up, and the actual health status score of the ith sewage pipe is a i I=1, 2 … n, failure outcome score b i I=1, 2 … n, then a i *b i Supply and demand balance results for the ith sewage pipeline:
the method comprises the following steps:
step 1: identifying key influence factors related to the actual health state and failure results of the sewage pipeline, and forming an actual health degree influence factor library and a failure result influence factor library of the urban sewage pipeline;
step 2: constructing two sets of sewage pipeline evaluation systems, namely an evaluation system (1) which is a health degree evaluation index system and an evaluation system (2) which is a failure result evaluation index system, wherein the two sets of evaluation index systems are mutually independent;
step 3: determining a supply quantity of the municipal sewage pipeline, wherein the evaluation system (1) aims at evaluating the actual health state of the municipal sewage pipeline, and the supply quantity is an actual health state score of the sewage pipeline;
step 4: determining the demand of the urban sewage pipeline, wherein the evaluation system (2) aims at evaluating the consequences and the influence generated after the urban sewage pipeline fails, and the demand is the score of the consequences of the sewage pipeline failure;
step 5: according to the score values of two sets of evaluation systems of each sewage pipeline, calculating a supply-demand balance result by adopting a matrix product method, and identifying two types of unbalanced pipelines;
step 6: in combination with street division in the target area, the proportion of unbalanced pipelines is counted by the balance relation between supply and demand of the sewage pipelines, for example, n sewage pipelines are arranged in a certain street area, the total pipe length is li, i=1, 2 … n, and the unbalanced pipe length is l Loss of i Where i=1, 2 … n, then the street area unbalanced pipe ratioStreet areas requiring urgent attention are identified.
2. The method for determining the maintenance sequence of the municipal sewage pipeline based on the supply and demand balance according to claim 1, wherein the evaluation system (1) evaluates the actual health condition of the municipal sewage pipeline, and the influence factor library comprises 25 evaluation indexes in total, namely corrosion, cracking, deformation, dislocation, disjointing, invasion, seepage, mud accumulation, scaling, sundries, water pool, plugging, tree root, pipe diameter, pipe length, pipe age, pipe material, gradient, burial depth, load state, flow rate, pipeline function, pressure load, soil type and underground water level.
3. The method for determining maintenance sequence of municipal sewage pipes based on supply and demand balance according to claim 1, wherein the evaluation system (2) evaluates social and environmental consequences and effects generated after failure of municipal sewage pipes, and the influence factor library comprises 9 evaluation indexes in total, namely distance from building, distance from river, distance from park and amusement facility, distance from degraded rainwater pipeline, road type, whether crossing railway, regional importance, distance from hospital and distance from school.
4. The method for determining maintenance sequence of urban sewage pipelines based on supply and demand balance according to claim 1, wherein two sets of evaluation index systems are constructed, the two sets of evaluation indexes are mutually independent, the indexes are not overlapped, and the health evaluation index system only evaluates the actual health state of the sewage pipelines and does not relate to the influence caused by failure of the sewage pipelines.
5. The method for determining maintenance order of municipal sewage pipes based on supply and demand balance according to claim 1, wherein the higher the health of the sewage pipes, the higher the score of the evaluation system (1); the higher the failure result of the sewage pipeline, the higher the score of the evaluation system (2); the matrix product method is adopted, the scores of the two sets of evaluation index systems are correspondingly multiplied to obtain the supply and demand result values of all sewage pipelines in the area, and the natural break point grading method is adopted to identify two types of unbalanced pipelines.
6. The method for determining maintenance order of municipal sewage pipes based on supply and demand balance according to claim 5, wherein the two types of unbalanced pipes are low in health and high in failure result, and the supply and demand result is high, and the two types of unbalanced pipes need to be repaired and maintained preferentially; the second type of unbalanced pipeline is high in health degree and low in failure result, and the municipal authorities temporarily do not consider the pipeline under the conditions of budget reduction and insufficient resource allocation due to low supply and demand result values.
7. The method for determining maintenance order of municipal sewage pipes based on supply and demand balance according to claim 1, wherein said identifying street areas requiring urgent attention considers the unbalanced occupancy of sewage pipes in each street in the target area according to the pipe length statistics.
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