Method for dividing types and grades of functional defects of water supply pipeline

Abstract

The invention relates to a water supply pipeline functional defect type and grade dividing method which comprises the following steps: dividing various pipeline functional defects according to names and grades to obtain pipeline functional defects of multiple grades and multiple names; on the basis of the obtained pipeline functional defects of the multiple levels and the multiple names, the corresponding relation between each pipeline functional defect and the defect score, the pressure influence coefficient and the defect length influence coefficient is constructed; detecting the damage condition of the pipeline, assigning a detection result according to the corresponding relation, and calculating to obtain a functional defect state evaluation score and the functional defect density of the pipe section; and determining the functional defect grade of the water supply pipeline according to the functional defect state evaluation score, and determining the functional defect type of the water supply pipeline according to the functional defect density of the pipe section. The classification of the types and grades of the functional defects of the water supply pipeline is defined, errors caused by qualitative analysis are reduced, the damage condition of the water supply pipeline can be correctly evaluated, and a basis is provided for follow-up pipeline maintenance and repair.

Description

Technical Field

[0001] The present invention relates to the technical field of municipal pipeline defect monitoring, and in particular to a method for classifying types and grades of functional defects of water supply pipelines. Background Art

[0002] Water supply network is an important infrastructure on which urban development and production depend. With the development of global urbanization, more and more cities are facing challenges caused by leakage due to aging water supply facilities.

[0003] The leakage problem of water supply pipe network has been plaguing the entire water supply industry. According to relevant statistics, the current pipeline leakage rate in my country has generally reached 20% to 30%, and the average leakage rate in major cities has reached 40%, with an annual leakage volume of nearly 10 billion cubic meters. In addition to affecting the water quality and supply efficiency of urban water supply, aging and leakage of water supply pipes will also cause disasters such as urban road collapse, seriously affecting the lives of urban residents.

[0004] Therefore, aging and leakage of water supply pipelines are inevitable problems for future urban development. Pipeline defects are generally divided into structural defects and functional defects. Before repairing water supply pipelines, it is necessary to detect the status of defective pipelines through television detection, sonar detection, ultrasonic detection and other technologies, evaluate the status of pipelines based on the detection results, form a results report, and provide feasible suggestions for pipeline maintenance and repair.

[0005] In the prior art, there is a relatively complete technical standard system for drainage pipeline engineering inspection and evaluation. In the drainage pipeline evaluation system, drainage pipeline defects are classified by name, code, and grade. However, the prior art still lacks a method for classifying the types and grades of functional defects in water supply pipelines, which makes it difficult to correctly evaluate the damage status of water supply pipelines. Summary of the invention

[0006] In view of the problems existing in the prior art, the purpose of the present invention is to provide a method for classifying the types and grades of functional defects of water supply pipelines, which can reduce the errors caused by qualitative analysis, is more conducive to the correct assessment of the damage condition of water supply pipelines, and provides a reliable basis for subsequent pipeline maintenance and repair.

[0007] In order to achieve the above object, the present invention adopts the following technical solution:

[0008] A method for classifying the types and grades of functional defects of a water supply pipeline comprises the following steps:

[0009] Various pipeline functional defects are divided according to names and levels, and pipeline functional defects with multiple levels and multiple names are obtained;

[0010] Based on the obtained pipeline functional defects of multiple levels and multiple names, the corresponding relationship between each pipeline functional defect and the defect score, pressure influence coefficient, and defect length influence coefficient is established;

[0011] The damage condition of the pipeline to be tested is tested to obtain a test result containing functional defects of the pipeline, the test result is assigned a value according to the corresponding relationship, and the functional defect status assessment score and the pipe section functional defect density are calculated; the functional defect level of the water supply pipeline is determined according to the functional defect status assessment score, and the functional defect type of the water supply pipeline is determined according to the pipe section functional defect density.

[0012] Furthermore, the functional defect status assessment score G is calculated as follows:

[0013]

[0014] Y max =max{P j}

[0015] Where: G——pipe section functional defect score;

[0016] Y max ——the score of the most serious functional defect of the pipe section;

[0017] Y——the average value calculated by the number of defect points in the functional defects of the pipe section;

[0018] P j ——defect score of the jth defect;

[0019] E j ——defect length coefficient of the jth defect;

[0020] n is the number of defects in the pipe section.

[0021] Furthermore, the evaluation of the functional defect level of the pipe section includes: when G≤1, the defect level is a general defect; when 1<G≤4, the defect level is a major defect; when 4<G≤7, the defect level is a major defect; when G>7, the defect level is a particularly major defect.

[0022] Furthermore, the calculation method of the functional defect density of the pipe section is as follows,

[0023]

[0024] Where: D G ——functional defect density of pipe section;

[0025] L——total length of the assessed pipe section;

[0026] L j——The longitudinal distance length of the jth defect.

[0027] Furthermore, when hour,

[0028] Furthermore, when D G ≤0.1, the functional defect type of the pipe section is determined to be a local defect; when 0.1<D G When D G When >0.5, the functional defect type of the pipe section is determined to be an overall defect.

[0029] Furthermore, the defect names include tube tumor, obstacle, redundant interface, deposition, air pocket, and suspended matter. Each defect name is divided into three levels and assigned different defect scores.

[0030] Furthermore, each defect name is divided into three levels including,

[0031] The first level of tube tumor is that the water flow section loss caused by the tube tumor is not more than 10%, the second level is that the water flow section loss caused by the tube tumor is between 10% and 20%, and the third level is that the water flow section loss caused by the tube tumor is more than 20%;

[0032] The first level of obstacles is that the water section loss is no more than 10%, the second level is that the water section loss is 10% to 20%, and the third level is that the water section loss is more than 20%;

[0033] The first level of redundant interface is that the diameter of the branch pipe accounts for no more than 20% of the diameter of the main pipe, the second level is that the diameter of the branch pipe accounts for between 20% and 40% of the diameter of the main pipe, and the third level is that the diameter of the branch pipe accounts for more than 40% of the diameter of the main pipe;

[0034] The first level of deposition is when the deposition thickness is no more than 10% of the pipe diameter, the second level is when the deposition thickness is 10% to 20% of the pipe diameter, and the third level is when the deposition thickness is more than 20% of the pipe diameter;

[0035] The first level of the airbag is that the airbag is no larger than 10% of the pipe diameter, the second level is that the airbag is 10% to 30% of the pipe diameter, and the third level is that the airbag is larger than 30% of the pipe diameter;

[0036] The first level of suspended matter is clear water with a small amount of suspended matter, the second level is relatively clear water with more suspended matter, and the third level is relatively turbid water with more suspended matter.

[0037] Furthermore, the three levels of defect scores for ductal tumors are 2, 4, and 6;

[0038] The three levels of obstacle defect scores are 2, 4, and 6;

[0039] The three levels of defect scores for redundant interfaces are 1, 3, and 5;

[0040] The three levels of deposition defect scores are 2, 4, and 5;

[0041] The three levels of defect scores for airbags are 3, 6, and 10;

[0042] The three levels of suspended matter defects have scores of 1, 4, and 7 respectively.

[0043] Furthermore, the defect length influence coefficient of the tube tumor is assigned as follows: if the defect longitudinal distance is not greater than 2m, it is 1.0; if the defect longitudinal distance is greater than or equal to 2m, it is 1.1;

[0044] The value assignment method of the defect length influence coefficient of the obstacle is: if the defect longitudinal distance is not greater than 2m, it is 1.0; if the defect longitudinal distance is not less than 2m, it is 1.1;

[0045] The defect length influence coefficient of the redundant interface is assigned a value of 1.0;

[0046] The method for assigning the influence coefficient of the length of the deposited defect is as follows: if the longitudinal distance of the defect is not greater than 2m, it is 1.0; if the longitudinal distance of the defect is greater than or equal to 2m, it is 1.1;

[0047] The value assignment method of the defect length influence coefficient of the airbag is: 1.0 for the defect longitudinal distance not greater than 4m; 1.1 for the defect longitudinal distance between 4m and 9m; 1.2 for the defect longitudinal distance greater than or equal to 9m;

[0048] The value of the defect length influence coefficient of suspended solids is assigned as 1.0.

[0049] In general, the present invention has the following advantages:

[0050] The present invention covers various common functional defects of water supply pipelines, divides the names and levels of functional defects, and clarifies the corresponding pipe section damage condition parameters for different levels of different functional defects. The pipeline functional defect status assessment score and functional defect density are obtained through quantitative analysis and calculation. This method clarifies the classification of water supply pipeline functional defect types and levels, reduces the errors caused by qualitative analysis, is more conducive to the correct assessment of the damage status of water supply pipelines, and provides a reliable basis for subsequent pipeline maintenance and repair. DETAILED DESCRIPTION

[0051] The present invention will be described in further detail below.

[0052] A method for classifying the types and grades of functional defects of a water supply pipeline comprises the following steps:

[0053] Various pipeline functional defects are divided according to names and levels, and pipeline functional defects with multiple levels and multiple names are obtained;

[0054] Based on the obtained pipeline functional defects of multiple levels and multiple names, the corresponding relationship between each pipeline functional defect and the defect score, pressure influence coefficient, and defect length influence coefficient is established;

[0055] The pipeline damage condition is detected, and the detection results are assigned values ​​according to the corresponding relationship, and the functional defect status evaluation score and the pipe section functional defect density are calculated; the functional defect level of the water supply pipeline is determined according to the functional defect status evaluation score G, and the functional defect level of the water supply pipeline is determined according to the pipe section functional defect density D. G Determine the type of functional defects in water supply pipelines.

[0056] Specifically, pipeline functional defects refer to defects in which the water flow section of the pipeline changes, affecting the water flow rate and water quality. The method of the present invention classifies the types and levels of functional defects of water supply pipelines through quantitative analysis based on test data, design data, operation and maintenance data, and survey data, as follows:

[0057] 1. The present invention classifies the names and levels of functional defects that may occur in pipelines, and different levels of different defects have corresponding scores, pressure influence coefficients, and defect length influence coefficients, as shown in Table 1.

[0058] Table 1 Names, levels and scores of functional defects

[0059]

[0060]

[0061] 2. After the pipeline is inspected, according to the inspection results and other relevant information, the damage condition parameters of the pipe section are taken from the above table, and the functional defect status assessment score is calculated according to the following formula:

[0062]

[0063] Y max =max{P j} (Formula 3)

[0064] Where: G——pipe section functional defect score;

[0065] Y max ——the score of the most serious functional defect of the pipe section;

[0066] Y is the average value calculated based on the number of defect points in the functional defects of the pipe section.

[0067] P j ——defect score of the jth defect;

[0068] E j ——defect length coefficient of the jth defect;

[0069] n is the number of defects in the pipe section.

[0070] The functional defect density of pipeline shall be calculated as follows:

[0071]

[0072] Where: D G ——functional defect density of pipe section;

[0073] L——total length of the assessed pipe section (m);

[0074] L j ——The longitudinal distance length of the jth defect (m). hour,

[0075] The evaluation of the functional defect level of the pipe section shall comply with the provisions of Table 2. The evaluation of the functional defect type of the pipe section can be determined according to Table 3.

[0076] Table 2 Evaluation table of functional defect levels of pipe sections

[0077] Defect level Rating value G General defects G≤1 Big flaws 1＜G≤4 Major Defects 4＜G≤7 Particularly serious defects G＞7

[0078] Table 3 Reference table for evaluation of pipe segment functional defect types

[0079] <![CDATA[Defect density D G > <![CDATA[D G ≤0.1]]> <![CDATA[0.1<D G ≤0.5]]> <![CDATA[D G >0.5]]> Functional defect type of pipe segment Local defects Some defects Overall defects

[0080] Advantages of the present invention:

[0081] The present invention proposes a method for dividing the types and levels of functional defects of water supply pipelines, covering various common functional defects of water supply pipelines, dividing the names and levels of functional defects, and clarifying the corresponding pipe section damage condition parameters for different levels of different functional defects. According to the pipeline detection situation, the pipeline functional defect status assessment score and functional defect density can be obtained through quantitative analysis and calculation to determine the pipeline functional defect type and defect level. This method clarifies the division of water supply pipeline functional defect types and levels, reduces the errors caused by qualitative analysis, and is more conducive to the correct assessment of the damage status of water supply pipelines, providing a reliable basis for subsequent pipeline maintenance and repair.

[0082] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A method for classifying the types and grades of functional defects of water supply pipelines, characterized by: The following steps are included: Various pipeline functional defects are divided according to names and levels, and pipeline functional defects with multiple levels and multiple names are obtained; Based on the obtained pipeline functional defects of multiple levels and multiple names, the corresponding relationship between each pipeline functional defect and the defect score, pressure influence coefficient, and defect length influence coefficient is established; The damage condition of the pipeline to be tested is tested to obtain a test result containing functional defects of the pipeline, and the test result is assigned a value according to the corresponding relationship to calculate the functional defect status assessment score G and the functional defect density D of the pipe section. G ; The functional defect level of the water supply pipeline is determined according to the functional defect status assessment score G, and the functional defect density D of the pipe section is determined according to the functional defect status assessment score G. G Determine the type of functional defects in water supply pipelines.

2. A method for classifying types and levels of functional defects of water supply pipelines according to claim 1, characterized in that: The calculation method of functional defect status assessment score G is as follows: Y max =max{P j } Where: G——pipe section functional defect score; Y max ——the score of the most serious functional defect of the pipe section; Y——the average value calculated by the number of defect points in the functional defects of the pipe section; P j ——defect score of the jth defect; E j ——defect length coefficient of the jth defect; n is the number of defects in the pipe section.

3. A method for classifying types and levels of functional defects of water supply pipelines according to claim 2, characterized in that: The assessment of the functional defect level of the pipe section includes: when G≤1, the defect level is a general defect; when 1<G≤4, the defect level is a major defect; when 4<G≤7, the defect level is a major defect; when G>7, the defect level is a particularly major defect.

4. A method for classifying types and levels of functional defects of water supply pipelines according to claim 2, characterized in that: The calculation method of the functional defect density of the pipe section is as follows: Where: D G ——functional defect density of pipe section; L——total length of the assessed pipe section; L j ——The longitudinal distance length of the jth defect.

5. A method for classifying types and levels of functional defects of water supply pipelines according to claim 4, characterized in that: when hour, 6. A method for classifying types and levels of functional defects of water supply pipelines according to claim 4, characterized in that: When D G ≤0.1, the functional defect type of the pipe section is determined to be a local defect; when 0.1<D G When D G When >0.5, the functional defect type of the pipe section is determined to be an overall defect.

7. A method for classifying types and levels of functional defects of water supply pipelines according to claim 1, characterized in that: The defect names include tube aneurysm, obstacle, redundant interface, deposition, air pocket, and suspended matter. Each defect name is divided into three levels and assigned different defect scores.

8. A method for classifying types and levels of functional defects of water supply pipelines according to claim 7, characterized in that: Each defect name is divided into three levels including: The first level of tube tumor is that the water flow section loss caused by the tube tumor is not more than 10%, the second level is that the water flow section loss caused by the tube tumor is between 10% and 20%, and the third level is that the water flow section loss caused by the tube tumor is more than 20%; The first level of obstacles is that the water section loss is no more than 10%, the second level is that the water section loss is 10% to 20%, and the third level is that the water section loss is more than 20%; The first level of redundant interface is that the diameter of the branch pipe accounts for no more than 20% of the diameter of the main pipe, the second level is that the diameter of the branch pipe accounts for between 20% and 40% of the diameter of the main pipe, and the third level is that the diameter of the branch pipe accounts for more than 40% of the diameter of the main pipe; The first level of deposition is when the deposition thickness is no more than 10% of the pipe diameter, the second level is when the deposition thickness is 10% to 20% of the pipe diameter, and the third level is when the deposition thickness is more than 20% of the pipe diameter; The first level of the airbag is that the airbag is no larger than 10% of the pipe diameter, the second level is that the airbag is 10% to 30% of the pipe diameter, and the third level is that the airbag is larger than 30% of the pipe diameter; The first level of suspended matter is clear water with a small amount of suspended matter, the second level is relatively clear water with more suspended matter, and the third level is relatively turbid water with more suspended matter.

9. A method for classifying types and levels of functional defects of water supply pipelines according to claim 8, characterized in that: The three levels of defect scores for ductal tumors are 2, 4, and 6; The three levels of obstacle defect scores are 2, 4, and 6; The three levels of defect scores for redundant interfaces are 1, 3, and 5; The three levels of deposition defect scores are 2, 4, and 5; The three levels of defect scores for airbags are 3, 6, and 10; The three levels of suspended matter defects have scores of 1, 4, and 7 respectively.

10. A method for classifying types and levels of functional defects of water supply pipelines according to claim 7, characterized in that: The value assignment method of the defect length influence coefficient of the tube tumor is: if the defect longitudinal distance is not greater than 2m, it is 1.0; if the defect longitudinal distance is greater than or equal to 2m, it is 1.1; The value assignment method of the defect length influence coefficient of the obstacle is: if the defect longitudinal distance is not greater than 2m, it is 1.0; if the defect longitudinal distance is not less than 2m, it is 1.1; The defect length influence coefficient of the redundant interface is assigned a value of 1.0; The method for assigning the influence coefficient of the length of the deposited defect is as follows: if the longitudinal distance of the defect is not greater than 2m, it is 1.0; if the longitudinal distance of the defect is greater than or equal to 2m, it is 1.1; The value assignment method of the defect length influence coefficient of the airbag is: 1.0 for the defect longitudinal distance not greater than 4m; 1.1 for the defect longitudinal distance between 4m and 9m; 1.2 for the defect longitudinal distance greater than or equal to 9m; The value of the defect length influence coefficient of suspended solids is assigned as 1.0.

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