A method for classifying the types and levels of functional defects in water supply pipelines.

Abstract

This invention relates to a method for classifying and grading functional defects in water supply pipelines. The method includes the following steps: classifying various pipeline functional defects according to their names and grades to obtain multiple grades and names of pipeline functional defects; based on the obtained multiple grades and names of pipeline functional defects, constructing a correspondence between each pipeline functional defect and its defect score, pressure influence coefficient, and defect length influence coefficient; detecting pipeline damage, assigning values ​​to the detection results according to the aforementioned correspondence, and calculating the functional defect status assessment score and the pipeline segment functional defect density; determining the water supply pipeline functional defect grade based on the functional defect status assessment score, and determining the water supply pipeline functional defect type based on the pipeline segment functional defect density. This method clarifies the classification of water supply pipeline functional defect types and grades, reduces errors caused by qualitative analysis, facilitates accurate assessment of water supply pipeline damage, and provides a basis for subsequent pipeline maintenance and repair.

Description

Technical Field

[0001] This invention relates to the field of municipal pipeline defect monitoring technology, specifically a method for classifying the types and levels of functional defects in water supply pipelines. Background Technology

[0002] Aging and leakage of water supply pipes are unavoidable problems for future urban development. Pipeline defects are generally divided into structural defects and functional defects. Before repairing water supply pipes, it is necessary to use technologies such as television inspection, sonar inspection, and ultrasonic inspection to inspect the condition of defective pipes. Based on the inspection results, the condition of the pipes is evaluated, and a report is generated to provide feasible suggestions for pipe maintenance and repair.

[0003] In the existing technology, there is a relatively complete technical standard system for the inspection and evaluation of drainage pipeline engineering. The drainage pipeline evaluation system classifies drainage pipeline defects by name, code, and level. However, the existing technology lacks a method for classifying the types and levels of functional defects in water supply pipelines, making it difficult to accurately assess the damage status of water supply pipelines. Summary of the Invention

[0004] To address the problems existing in the prior art, the purpose of this invention is to provide a method for classifying the types and levels of functional defects in water supply pipelines. This method can reduce errors caused by qualitative analysis, facilitate a more accurate assessment of the damage status of water supply pipelines, and provide a reliable basis for subsequent pipeline maintenance and repair.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A method for classifying and classifying functional defects in water supply pipelines includes the following steps:

[0007] Various pipeline functional defects are classified according to their names and levels, resulting in pipeline functional defects with multiple levels and names;

[0008] Based on the obtained pipeline functional defects of multiple levels and names, a correspondence is constructed between each pipeline functional defect and its defect score, pressure influence coefficient, and defect length influence coefficient.

[0009] The damage condition of the pipeline to be tested is detected to obtain the detection results containing the functional defects of the pipeline. The detection results are assigned values ​​according to the corresponding relationship, and the functional defect status assessment score and the functional defect density of the pipeline segment 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 functional defect density of the pipeline segment.

[0010] Furthermore, the functional defect status assessment score G is calculated as follows:

[0011]

[0012] Y max =max{P j}

[0013] Where: G—the functional defect score of the pipe section;

[0014] Y max —The score for the most severe functional defect in the pipeline segment;

[0015] Y—The average value of functional defects in the pipe section, calculated based on the number of defect points;

[0016] P j —The defect score of the j-th defect;

[0017] E j —The defect length coefficient of the j-th defect;

[0018] n — the number of defects in the pipe section.

[0019] Furthermore, the functional defect level assessment of the pipeline 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 serious defect; and when G>7, the defect level is an extremely serious defect.

[0020] Furthermore, the calculation method for the functional defect density of the pipe section is as follows:

[0021]

[0022] In the formula: D G —Density of functional defects in the pipe section;

[0023] L—Total length of the pipe segment being evaluated;

[0024] L j — The longitudinal distance length of the j-th defect.

[0025] Furthermore, when hour,

[0026] Furthermore, when D G When ≤0.1, the functional defect type of the pipe section is determined to be a local defect; when 0.1 < D G When D ≤ 0.5, the functional defect type of the pipe section is determined to be a partial defect; when D G When the value is greater than 0.5, the functional defect type of the pipe section is determined to be an overall defect.

[0027] Furthermore, the defect names include tube nodules, obstructions, redundant interfaces, deposits, air sacs, and suspended matter. Each defect name is divided into three levels and assigned a different defect score.

[0028] Furthermore, each defect name is divided into three levels, including:

[0029] The first level of hemangioma is when the water flow loss caused by hemangioma is no more than 10%, the second level is when the water flow loss caused by hemangioma is between 10% and 20%, and the third level is when the water flow loss caused by hemangioma is greater than 20%.

[0030] The first level of obstacles is when the cross-sectional loss of water passage is no more than 10%, the second level is when the cross-sectional loss of water passage is 10% to 20%, and the third level is when the cross-sectional loss of water passage is greater than 20%.

[0031] The first level of redundant interfaces is when the diameter of the branch pipe is no more than 20% of the diameter of the main pipe; the second level is when the diameter of the branch pipe is between 20% and 40% of the diameter of the main pipe; and the third level is when the diameter of the branch pipe is more than 40% of the diameter of the main pipe.

[0032] The first level of sedimentation is when the sediment thickness is no more than 10% of the pipe diameter; the second level is when the sediment thickness is 10% to 20% of the pipe diameter; and the third level is when the sediment thickness is greater than 20% of the pipe diameter.

[0033] The first level of airbags 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.

[0034] The first level of suspended solids is clear water with a small amount of suspended matter; the second level is relatively clear water with a large amount of suspended matter; and the third level is relatively turbid water with a large amount of suspended matter.

[0035] Furthermore, the defect scores for the three grades of duct nodules are 2, 4, and 6, respectively;

[0036] The three levels of defect scores for obstacles are 2, 4, and 6, respectively;

[0037] The defect scores for the three levels of redundant interfaces are 1, 3, and 5, respectively.

[0038] The defect scores for the three levels of deposition are 2, 4, and 5, respectively;

[0039] The three levels of defect scores for airbags are 3, 6, and 10, respectively.

[0040] The defect scores for the three levels of suspended matter are 1, 4, and 7, respectively.

[0041] Furthermore, the method for assigning the defect length influence coefficient of the tube nodule is as follows: 1.0 is taken when the longitudinal distance of the defect is not greater than 2m; and 1.1 is taken when the longitudinal distance of the defect is greater than or equal to 2m.

[0042] The method for assigning the influence coefficient of the defect length of the obstacle is as follows: 1.0 is taken when the longitudinal distance of the defect is not greater than 2m; 1.1 is taken when the longitudinal distance of the defect is not less than 2m.

[0043] The defect length impact coefficient of redundant interfaces is assigned a value of 1.0;

[0044] The method for assigning the influence coefficient of the deposition defect length is as follows: 1.0 is taken for defects with a longitudinal distance of no more than 2m; 1.1 is taken for defects with a longitudinal distance of 2m or more.

[0045] The method for assigning the influence coefficient of the defect length of the airbag is as follows: 1.0 for defect longitudinal distance not greater than 4m; 1.1 for defect longitudinal distance between 4m and 9m; and 1.2 for defect longitudinal distance greater than or equal to 9m.

[0046] The method for assigning the defect length influence coefficient of suspended matter is to take 1.0.

[0047] In summary, the present invention has the following advantages:

[0048] This invention covers various common functional defects in water supply pipelines, classifying them by name and level. Different levels of functional defects clearly define the corresponding damage parameters for different pipe sections. Through quantitative analysis and calculation, the functional defect status assessment scores and density are obtained. This method clarifies the classification of functional defects and levels in water supply pipelines, reducing errors from qualitative analysis and facilitating accurate assessment of pipeline damage. It provides a reliable basis for subsequent pipeline maintenance and repair. Detailed Implementation

[0049] The present invention will now be described in further detail.

[0050] A method for classifying and classifying functional defects in water supply pipelines includes the following steps:

[0051] Various pipeline functional defects are classified according to their names and levels, resulting in pipeline functional defects with multiple levels and names;

[0052] Based on the obtained pipeline functional defects of multiple levels and names, a correspondence is constructed between each pipeline functional defect and its defect score, pressure influence coefficient, and defect length influence coefficient.

[0053] The pipeline damage condition is inspected, and the inspection results are assigned values ​​according to the aforementioned correspondence to calculate the functional defect status assessment score and the functional defect density of the pipe section. The functional defect level of the water supply pipeline is determined based on the functional defect status assessment score G, and the functional defect density of the pipe section D is determined based on the functional defect level D. G Determine the type of functional defect in the water supply pipeline.

[0054] Specifically, pipeline functional defects refer to changes in the cross-sectional area of ​​the pipeline that affect the flow rate and water quality. Based on testing data, design data, operation and maintenance data, and survey data, the method of this invention uses quantitative analysis to classify the types and levels of functional defects in water supply pipelines, as follows:

[0055] 1. This invention addresses potential functional defects in pipelines by classifying these defects by name and level. Different levels of defects have corresponding scores, pressure influence coefficients, and defect length influence coefficients, as shown in Table 1.

[0056] Table 1. Names, levels, and scores of functional defects.

[0057]

[0058]

[0059] 2. After pipeline inspection, based on the inspection results and other relevant data, the parameters for pipeline damage status are calculated using the table above, and the functional defect status assessment score is calculated using the following formula:

[0060]

[0061] Y max =max{P j (Equation 3)

[0062] Where: G—the functional defect score of the pipe section;

[0063] Y max —The score for the most severe functional defect in the pipeline segment;

[0064] Y – The average value calculated based on the number of defect points in the functional defects of the pipe section.

[0065] P j —The defect score of the j-th defect;

[0066] E j —The defect length coefficient of the j-th defect;

[0067] n — the number of defects in the pipe section.

[0068] The density of functional defects in pipelines should be calculated using the following formula:

[0069]

[0070] In the formula: D G —Density of functional defects in the pipe section;

[0071] L—Total length of the pipe segment being evaluated (m);

[0072] L j —The longitudinal distance (m) of the j-th defect. When hour,

[0073] The assessment of the functional defect level of a pipe section shall comply with the provisions of Table 2. The assessment of the functional defect type of a pipe section may be determined according to Table 3.

[0074] Table 2. Evaluation Table of Functional Defect Levels of Pipe Sections

[0075] Defect Level Rating G General defects G≤1 Major defects 1＜G≤4 Major defects 4＜G≤7 Particularly significant defects G＞7

[0076] Table 3 Reference Table for Assessing Functional Defect Types of Pipe Sections

[0077] <![CDATA[Defect density D G > <![CDATA[D G ≤0.1]]> <![CDATA[0.1<D G ≤0.5]]> <![CDATA[D G >0.5]]> Pipeline segment functional defect types Local defects Some defects Overall defects

[0078] Advantages of this invention:

[0079] This invention proposes a method for classifying the types and levels of functional defects in water supply pipelines. It covers various common functional defects in water supply pipelines, classifying them by name and level. Different levels of functional defects clearly define the corresponding damage parameters of the pipe sections. Based on pipeline inspection data, the functional defect status assessment score and functional defect density can be obtained through quantitative analysis, determining the type and level of the pipeline functional defects. This method clarifies the classification of functional defect types and levels in water supply pipelines, reduces errors caused by qualitative analysis, and facilitates a more accurate assessment of water supply pipeline damage, providing a reliable basis for subsequent pipeline maintenance and repair.

[0080] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A method for classifying the types and levels of functional defects in water supply pipelines, characterized in that: Includes the following steps, Various pipeline functional defects are classified according to their names and levels, resulting in pipeline functional defects with multiple levels and names; Based on the obtained pipeline functional defects of multiple levels and names, a correspondence is constructed between each pipeline functional defect and its defect score, pressure influence coefficient, and defect length influence coefficient. The damage condition of the pipeline under test is inspected to obtain the detection results containing the functional defects of the pipeline. The detection results are assigned values ​​according to the aforementioned correspondence, and the functional defect status assessment score G and the functional defect density D of the pipeline segment are calculated. G ; The functional defect level of the water supply pipeline is determined based on the functional defect status assessment score G, and the functional defect density D of the pipeline section is also considered. G Determine the type of functional defect in the water supply pipeline; The functional defect status assessment score G is calculated as follows: Y max =max{P j } Where: G—the functional defect score of the pipe section; Y max —The score for the most severe functional defect in the pipeline segment; Y—The average value of functional defects in the pipe section, calculated based on the number of defect points; P j —The defect score of the j-th defect; E j —The defect length coefficient of the j-th defect; n—the number of defects in the pipe section; The calculation method for the functional defect density of a pipe section is as follows: In the formula: D G —Density of functional defects in the pipe section; L—Total length of the pipe segment being evaluated; L j —The longitudinal distance length of the j-th defect; The defect names include tube nodules, obstructions, redundant interfaces, deposits, air bladders, and suspended matter. Each defect name is divided into three levels and assigned a different defect score. Each defect name is divided into three levels, including: The first level of hemangioma is when the water flow loss caused by hemangioma is no more than 10%, the second level is when the water flow loss caused by hemangioma is between 10% and 20%, and the third level is when the water flow loss caused by hemangioma is greater than 20%. The first level of obstacles is when the cross-sectional loss of water passage is no more than 10%, the second level is when the cross-sectional loss of water passage is 10% to 20%, and the third level is when the cross-sectional loss of water passage is greater than 20%. The first level of redundant interfaces is when the diameter of the branch pipe is no more than 20% of the diameter of the main pipe; the second level is when the diameter of the branch pipe is between 20% and 40% of the diameter of the main pipe; and the third level is when the diameter of the branch pipe is more than 40% of the diameter of the main pipe. The first level of sedimentation is when the sediment thickness is no more than 10% of the pipe diameter; the second level is when the sediment thickness is 10% to 20% of the pipe diameter; and the third level is when the sediment thickness is greater than 20% of the pipe diameter. The first level of airbags 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 solids is clear water with a small amount of suspended matter; the second level is relatively clear water with a large amount of suspended matter; and the third level is relatively turbid water with a large amount of suspended matter.

2. The method for classifying the types and levels of functional defects in water supply pipelines according to claim 1, characterized in that: The functional defect level assessment of the pipeline 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 serious defect; and when G>7, the defect level is an extremely serious defect.

3. The method for classifying the types and levels of functional defects in water supply pipelines according to claim 1, characterized in that: when hour, 4. The method for classifying the types and levels of functional defects in water supply pipelines according to claim 1, characterized in that: When D G When ≤0.1, the functional defect type of the pipe section is determined to be a local defect; when 0.1 < D G When D ≤ 0.5, the functional defect type of the pipe section is determined to be a partial defect; when D G When the value is greater than 0.5, the functional defect type of the pipe section is determined to be an overall defect.

5. The method for classifying the types and levels of functional defects in water supply pipelines according to claim 1, characterized in that: The three grades of duct nodules are scored as 2, 4, and 6, respectively. The three levels of defect scores for obstacles are 2, 4, and 6, respectively; The defect scores for the three levels of redundant interfaces are 1, 3, and 5, respectively. The defect scores for the three levels of deposition are 2, 4, and 5, respectively; The three levels of defect scores for airbags are 3, 6, and 10, respectively. The defect scores for the three levels of suspended matter are 1, 4, and 7, respectively.

6. The method for classifying the types and levels of functional defects in water supply pipelines according to claim 1, characterized in that: The method for assigning the defect length influence coefficient of tube nodules is as follows: 1.0 is taken when the longitudinal distance of the defect is not greater than 2m; 1.1 is taken when the longitudinal distance of the defect is greater than or equal to 2m. The method for assigning the influence coefficient of the defect length of the obstacle is as follows: 1.0 is taken when the longitudinal distance of the defect is not greater than 2m; 1.1 is taken when the longitudinal distance of the defect is not less than 2m. The defect length impact coefficient of redundant interfaces is assigned a value of 1.0; The method for assigning the influence coefficient of the deposition defect length is as follows: 1.0 is taken for defects with a longitudinal distance of no more than 2m; 1.1 is taken for defects with a longitudinal distance of 2m or more. The method for assigning the influence coefficient of the defect length of the airbag is as follows: 1.0 for defect longitudinal distance not greater than 4m; 1.1 for defect longitudinal distance between 4m and 9m; and 1.2 for defect longitudinal distance greater than or equal to 9m. The method for assigning the defect length influence coefficient of suspended matter is to take 1.0.

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