Pipeline non-excavation top pulling expansion replacement process and replacement evaluation method and system thereof

Abstract

The invention provides a pipeline non-excavation top pulling expansion replacement process and a replacement evaluation method thereof, and relates to the technical field of pipeline replacement. A three-dimensional coordinate system is established, coordinates of the inner wall of a replacement pipe are uniformly collected, three-dimensional coordinate analysis and correlation analysis are adopted, and a centrifugal index is calculated through a specific mathematical formula; the displacement evaluation result is more accurate, the potential structure problem of the pipeline can be effectively identified, the deflection degree of the displacement pipe is comprehensively reflected in combination with the centrifugal index, the maximum centrifugal index and the comprehensive centrifugal index, and meanwhile relevant displacement data influencing the compression degree of the displacement pipe are collected and analyzed. And generating a replacement pipe wall thickness index for reflecting the required pipe wall thickness degree under the current replacement condition, performing correlation analysis on the comprehensive centrifugal index and the replacement pipe wall thickness index, generating a replacement evaluation index for reflecting the durability index of the replacement pipe under the current replacement process, and outputting the durability degree grade of the replacement pipe.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline replacement, and in particular to a pipeline trenchless top expansion replacement process and a replacement evaluation method and system thereof. Background Art

[0002] With the acceleration of urbanization, the laying and maintenance of underground pipelines have become increasingly important. Traditional pipeline replacement methods usually rely on excavation processes, which not only increases construction costs and time, but also has a certain impact on the surrounding environment. In order to solve this problem, trenchless technology has emerged, among which the top expansion replacement process based on MASHDPE (modified high-density polyethylene) pipes has gradually received attention. This technology greatly reduces the interference to the surface environment by replacing pipelines under trenchless conditions, and has higher construction efficiency and safety. As a new type of trenchless pipeline, MASHDPE pipe is widely used in the replacement of urban sewage, rainwater and water supply pipeline systems due to its excellent physical and chemical properties. However, in actual applications, the replacement effect and durability of MASHDPE pipes are affected by many factors, such as the geometry of the pipeline, construction conditions, etc.

[0003] In practical applications, the geometric shape of the replacement pipe will reflect the degree of deflection of the entire replacement pipe. If the replacement pipe is too deflected, it means that part of the replacement pipe deviates from the center line during the replacement process, which will cause uneven force on the replacement pipe during actual use, resulting in reduced durability. At the same time, the parameters of the soil on the side of the pipe will also affect the durability of the replacement pipe. The existing replacement pipe evaluation methods mostly rely on experience and intuitive judgment, which will lead to inaccurate evaluation results.

[0004] The above information disclosed in this Background section is only for enhancement of understanding of the background of the present disclosure and therefore it may contain information that does not constitute the prior art that is already known to one of ordinary skill in the art. Summary of the invention

[0005] The object of the present invention is to provide a pipeline trenchless top expansion replacement process and a replacement evaluation method and system thereof, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The pipeline trenchless top expansion replacement process and its replacement evaluation method include the following specific steps:

[0008] 1) Pipeline plugging: Use air bags to plug the upstream and downstream of the pipeline that needs to be replaced to prevent water or other substances from entering the construction area;

[0009] 2) Pipeline desilting: remove sediment, debris and dirt in the pipeline;

[0010] 3) Pipeline inspection: The pipeline inspection robot records pipeline damage information, providing a basis for subsequent solutions;

[0011] 4) Plan deepening: Based on the pipeline inspection results, optimize the pipeline replacement plan and plan the construction process;

[0012] 5) Pipeline structure restoration: Use a professional restoration guide head to restore the original pipeline with structural defects;

[0013] 6) Crushing of original pipeline: Use professional crushing guide head to crush and clean the restored pipeline;

[0014] 7) Top expansion cycle construction: Use a professional expansion guide head to radially expand and extrude the original pipe after cutting, and the top expansion cycle construction is completed to replace the original pipe with structural defects;

[0015] 8) Water-tightness test;

[0016] 9) Evaluation work after replacement;

[0017] The post-replacement assessment work includes the following steps:

[0018] S1. After the replacement of the replacement tube is completed, a three-dimensional coordinate system is established, and N sections of the replacement tube are placed in the three-dimensional coordinate system, wherein the centers of both ends of the replacement tube are placed on the X-axis;

[0019] S2, uniformly collect 3*N groups of inner wall coordinates of the replacement tube, each section of the replacement tube has 3 groups of inner wall coordinates, and the plane formed by each group of inner wall coordinates is perpendicular to the X axis;

[0020] S3, performing correlation analysis on the inner wall coordinates to generate a replacement tube centrifugal index LX, where the replacement tube centrifugal index LX is used to reflect the overall deflection degree of the replacement tube;

[0021] S4. performing correlation analysis on the inner wall coordinates to generate a maximum centrifugal index ZLX of the replacement tube, where the maximum centrifugal index ZLX of the replacement tube is used to reflect the maximum degree of deflection of the replacement tube;

[0022] S5. performing correlation analysis on the maximum centrifugal index of the replacement tube and the centrifugal index of the replacement tube to generate a comprehensive centrifugal index ZZL of the replacement tube, wherein the comprehensive centrifugal index ZZL of the replacement tube is used to reflect the degree of eccentricity of the replacement tube;

[0023] S6, collecting replacement data;

[0024] S7, analyzing the replacement data to generate a replacement pipe wall thickness index, where the replacement pipe wall thickness index T is used to reflect the pipe wall thickness coefficient required under the current replacement condition;

[0025] S8, performing correlation analysis on the replacement pipe wall thickness index T and the comprehensive evaluation index ZPz to generate a replacement evaluation index ZP;

[0026] S9. Compare the replacement evaluation index ZP with the replacement threshold value, and output the durability grade of the replacement pipe.

[0027] Furthermore, in S2, all inner wall coordinate points are numbered, wherein the inner wall coordinate point of the i-th group is numbered as Indicates that its inner wall coordinates are

[0028] Furthermore, the inner wall coordinates are subjected to correlation analysis to generate the center coordinates of the i-th group of inner wall coordinate points: The formula is:

[0029]

[0030] After combining the above formulas, y is output through matlabe software i and z i The specific value of the center coordinate of the i-th group of inner wall coordinate points Used to reflect the center point position of the inner wall of the displacement tube.

[0031] Furthermore, for the i-th group of inner wall coordinate points, the center coordinates Correlation analysis was performed to generate the replacement tube centrifugal index LX, based on the formula:

[0032]

[0033] The replacement tube centrifugal index LX is used to reflect the overall deflection of the replacement tube.

[0034] Furthermore, for the i-th group of inner wall coordinate points, the center coordinates Correlation analysis was performed to generate the maximum centrifugal index ZLX of the replacement tube, based on the formula:

[0035]

[0036] The maximum centrifugal index ZLX of the replacement tube is used to reflect the maximum deflection degree of the replacement tube, where max(*) is used to indicate the maximum value of *, and min(*) is used to indicate the minimum value of *;

[0037] The correlation analysis of the maximum centrifugal index and the centrifugal index of the replacement tube was performed to generate the comprehensive centrifugal index ZZL of the replacement tube. The formula is: ZZL = LX * ZLX + LX ZLX The comprehensive centrifugal index ZZL of the replacement tube is used to reflect the degree of eccentricity of the replacement tube.

[0038] Furthermore, the replacement data are collected and analyzed, and the replacement data include the groundwater level height H w , pipeline laying depth H, pipe top soil thickness H s , ellipticity reduction factor C, water buoyancy factor R W , elastic modulus E of the pipeline, elastic support coefficient B, elastic modulus E of the soil beside the pipe T , generate the replacement pipe wall thickness index T, based on the formula:

[0039]

[0040] in, The replacement pipe wall thickness index T is used to reflect the pipe wall thickness index required under current conditions.

[0041] Furthermore, the correlation analysis was performed on the replacement tube wall thickness index T and the replacement tube comprehensive centrifugal index ZZL to generate the replacement evaluation index ZP, based on the formula:

[0042]

[0043] The replacement evaluation index ZP is used to reflect the durability index of the replacement tube under the current replacement process, where G is the wall thickness of the replacement tube.

[0044] Furthermore, the replacement threshold Δ is 1.68, and the replacement evaluation index ZP is compared with the replacement threshold to output the durability level of the replacement tube. When ZP>Δ, it means that the durability level of the replacement tube is level two, the durability is unqualified, and the replacement tube needs to be readjusted and repaired; when ZP≤Δ, it means that the durability level of the replacement tube is level one, and the durability is qualified.

[0045] The present invention also provides a replacement evaluation system based on the MASHDPE pipe trenchless top expansion replacement process, which is used to perform the pipeline trenchless top expansion replacement process and a replacement evaluation method thereof, including:

[0046] A definition module, used to define a three-dimensional coordinate system for the entire displacement tube;

[0047] A coordinate acquisition module is used to collect the coordinate data of points on the inner circle of each replacement tube;

[0048] A fitting analysis module is used to perform correlation analysis on the inner wall coordinates and generate the centrifugal index of the replacement tube and the maximum centrifugal index of the replacement tube;

[0049] A comprehensive evaluation index module is used to perform correlation analysis on the centrifugal index of the replacement tube and the maximum centrifugal index of the replacement tube to generate a comprehensive centrifugal index of the replacement tube;

[0050] An acquisition module is used to acquire and analyze replacement data to generate a replacement pipe wall thickness index;

[0051] The replacement evaluation module is used to perform correlation analysis on the replacement pipe wall thickness index T and the comprehensive evaluation index ZPz, generate the replacement evaluation index ZP and output the replacement pipe durability grade.

[0052] Compared with the prior art, the present invention has the following beneficial effects:

[0053] 1. The present invention uses a professional restoration guide head to restore the original pipeline with structural defects, which is convenient for the alignment of the original pipeline joints and the entry of the guide head; at the same time, during the top expansion cycle construction process, the original pipeline is more conducive to replacement after alignment.

[0054] 2. By establishing a three-dimensional coordinate system and uniformly collecting the inner wall coordinates of the replacement pipe, using three-dimensional coordinate analysis and correlation analysis, and calculating the centrifugal index through a specific mathematical formula, the replacement evaluation result is more accurate, and the potential structural problems of the pipeline can be effectively identified. The centrifugal index, maximum centrifugal index and comprehensive centrifugal index are combined to comprehensively reflect the degree of deflection of the replacement pipe. At the same time, relevant replacement data that affect the pressure degree of the replacement pipe are collected and analyzed to generate a replacement pipe wall thickness index that reflects the required wall thickness under the current replacement conditions. The comprehensive centrifugal index and the replacement pipe wall thickness index are correlated and analyzed to generate a replacement evaluation index that reflects the durability index of the replacement pipe under the current replacement process, and the durability level of the replacement pipe is output. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 It is a schematic diagram of the evaluation process after replacement of the present invention;

[0056] Figure 2 It is a schematic diagram of the process flow of trenchless top expansion replacement of pipelines according to the present invention. DETAILED DESCRIPTION

[0057] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0058] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0059] Example:

[0060] See also Figure 1-2 , the present invention provides a technical solution:

[0061] Pipeline trenchless top expansion replacement process and its replacement evaluation method. In actual application, the geometric shape of the replacement pipe will reflect the degree of deflection of the overall replacement pipe. If the replacement pipe is too deflected, it means that part of the replacement pipe deviates from the center line during the replacement process, which will cause uneven force on the replacement pipe in actual use, resulting in reduced durability. At the same time, the parameters of the soil on the side of the pipe will also affect the durability of the replacement pipe. The existing replacement pipe evaluation methods mostly rely on experience and intuitive judgment, which will lead to inaccurate evaluation results. In order to conduct a comprehensive analysis of the degree of eccentricity of the replacement pipe and the parameters of the soil on the side of the pipe, the durability of the replacement pipe is output.

[0062] As some drainage pipes have been in service for a long time, there are damages such as pipe dislocation, rupture, collapse, leakage, corrosion, etc., which affect the normal use of the pipes and the surrounding environment. Therefore, the MASHDPE pipe non-excavation top tension and expansion replacement process is adopted for pipe network replacement. The drainage pipe needs to be replaced by MASHDPE pipe non-excavation top tension and expansion replacement. The replacement pipe material is generally MASHDPE top-pull composite steady-state pipe, the pipe color is white, and it is connected by a self-locking double sealing rubber ring. The physical and mechanical requirements of MASHDPE top-pull composite steady-state pipe are: ring stiffness>32kN / m2, ring flexibility>50%, the inner wall should be smooth, without reverse bending and cracking.

[0063] The MASHDPE pipe trenchless top expansion replacement process is a process that uses the old pipe to be replaced as a guide to carry out trenchless top expansion replacement repair of the pipe. It is suitable for reinforced concrete pipes, plastic pipes and other pipes. It is a relatively feasible and once-and-for-all pipe network renewal and replacement process in the current pipeline renewal and reconstruction. The specific pipe replacement process method is as follows:

[0064] 1) Pipeline plugging: Use air bags to plug the upstream and downstream of the pipeline that needs to be replaced to prevent water or other substances from entering the construction area to ensure safe and smooth construction.

[0065] 2) Pipeline desilting: Remove sediment, debris and dirt from the pipeline to ensure the smooth progress of the replacement process.

[0066] 3) Pipeline inspection: The pipeline damage information recorded by the pipeline inspection robot provides a basis for subsequent plans to formulate targeted replacement strategies.

[0067] 4) Plan deepening: Based on the pipeline inspection results, combined with factors such as the pipeline material, diameter, and surrounding environment, further optimize the pipeline replacement plan and plan details such as construction process, personnel arrangements, equipment deployment, and safety measures.

[0068] 5) Pipeline structure restoration: Use a professional restoration guide head to restore the original pipeline with structural defects.

[0069] 6) Crushing of original pipeline: Use professional crushing guide head to crush and clean the restored pipeline.

[0070] 7) Top-tension and expansion cycle construction: Use a professional hole expansion guide head to radially expand and extrude the original pipe after cutting, and the top-tension and expansion cycle construction is completed to replace the original pipe with structural defects.

[0071] 8) Water-tightness test: After replacement, the drainage pipe should be subjected to a water-tightness test before backfilling.

[0072] 9) Evaluation work after replacement.

[0073] The post-replacement assessment work includes the following steps:

[0074] Step 1: After the replacement of the replacement tube is completed, a three-dimensional coordinate system is established, and N sections of the replacement tube are placed in the three-dimensional coordinate system, wherein the centers of both ends of the replacement tube are placed on the X-axis; after the coordinate system is established, relevant data can be input into the coordinate system for calculation, which is convenient for statistical analysis;

[0075] Step 2, uniformly collect 3*N groups of inner wall coordinates of the replacement tube, each section of the replacement tube has 3 groups of inner wall coordinates, and the plane formed by each group of inner wall coordinates is perpendicular to the X-axis; when collecting the inner wall coordinates of the replacement tube, a total station is used to measure and calibrate the coordinates;

[0076] All the inner wall coordinate points are numbered, where the jth inner wall coordinate point of the i-th group is numbered Indicates that its inner wall coordinates are There are 3 coordinates in each group, that is, the values ​​of j are 1, 2, and 3, and there are 3N groups in total.

[0077] In order to evaluate the degree of centrifugation of the displacement tube, the center point of each set of coordinates of the displacement tube is first calculated. The calculation steps are as follows:

[0078] Step 3, performing correlation analysis on the inner wall coordinates to generate a replacement tube centrifugal index LX, where the replacement tube centrifugal index LX is used to reflect the overall deflection degree of the replacement tube;

[0079] Perform correlation analysis on the inner wall coordinates to generate the center coordinates of the i-th group of inner wall coordinate points The formula is:

[0080]

[0081] The above formula is the center coordinates of the i-th group of inner wall coordinate points The coordinates of the intersection of the vertical lines are the center point, and then the above formulas are combined and input into the matlabe software to output y i and z i The specific value of the center coordinate of the i-th group of inner wall coordinate points Used to reflect the center point position of the inner wall of the replacement tube;

[0082] Comprehensively analyze the center coordinates of all inner wall coordinate points to generate the replacement tube centrifugal index LX;

[0083] For the i-th group of inner wall coordinate points, the center coordinates Correlation analysis was performed to generate the replacement tube centrifugal index LX, based on the formula:

[0084]

[0085] The replacement tube centrifugal index LX is used to reflect the overall deflection of the replacement tube.

[0086] In order to evaluate the centrifugal degree of the replacement tube, it is also necessary to analyze the maximum centrifugal degree of the replacement tube. The analysis steps are as follows:

[0087] Step 4, performing correlation analysis on the inner wall coordinates to generate the maximum centrifugal index ZLX of the replacement tube, where the maximum centrifugal index ZLX of the replacement tube is used to reflect the maximum deflection degree of the replacement tube;

[0088] For the i-th group of inner wall coordinate points, the center coordinates Correlation analysis was performed to generate the maximum centrifugal index ZLX of the replacement tube, based on the formula:

[0089]

[0090] The maximum centrifugal index ZLX of the replacement tube is used to reflect the maximum deflection degree of the replacement tube, where max(*) is used to indicate the maximum value of *, and min(*) is used to indicate the minimum value of *;

[0091] Step 5, performing correlation analysis on the maximum centrifugal index of the replacement tube and the centrifugal index of the replacement tube to generate a comprehensive centrifugal index ZZL of the replacement tube, wherein the comprehensive centrifugal index ZZL of the replacement tube is used to reflect the degree of eccentricity of the replacement tube;

[0092] The correlation analysis of the maximum centrifugal index and the centrifugal index of the replacement tube was performed to generate the comprehensive centrifugal index ZZL of the replacement tube. The formula is: ZZL = LX * ZLX + LX ZLX The comprehensive centrifugal index ZZL of the replacement tube is used to reflect the comprehensive eccentricity of the replacement tube. If the replacement tube is too skewed, it means that part of the replacement tube deviates from the center line during the replacement process, which will cause uneven force on the replacement tube during actual use, resulting in reduced durability.

[0093] The durability of the replacement pipe also depends on the data that affect the stress of the replacement pipe, such as the groundwater level, pipeline laying depth, pipe top soil thickness, ovality reduction factor, water buoyancy factor, etc. At the same time, the elastic modulus of the pipeline, the support coefficient of the support, and the elastic modulus of the soil on the side of the pipe will also affect the stress of the replacement pipe. Therefore, relevant data are collected and analyzed, as follows:

[0094] Step 6: Collect replacement data; collect replacement data and analyze the replacement data. The replacement data includes the groundwater level height H w , pipeline laying depth H, pipe top soil thickness H s , ellipticity reduction factor C, water buoyancy factor R W , elastic modulus E of the pipeline, elastic support coefficient B, elastic modulus E of the soil beside the pipe T ;

[0095] Step 7, analyzing the replacement data to generate a replacement pipe wall thickness index, where the replacement pipe wall thickness index T is used to reflect the required pipe wall thickness coefficient under the current replacement conditions;

[0096] The replacement pipe wall thickness index T is generated based on the formula:

[0097]

[0098] in, The replacement pipe wall thickness index T is used to reflect the pipe wall thickness index required under current conditions.

[0099] Step 8, performing correlation analysis on the replacement pipe wall thickness index T and the comprehensive evaluation index ZPz to generate a replacement evaluation index ZP;

[0100] Step 9: Compare the replacement evaluation index ZP with the replacement threshold value and output the durability grade of the replacement pipe.

[0101] The replacement evaluation index ZP is generated by performing a correlation analysis on the replacement tube wall thickness index T and the replacement tube comprehensive centrifugal index ZZL. The formula is as follows:

[0102]

[0103] The replacement evaluation index ZP is used to reflect the durability index of the replacement tube under the current replacement process, where G is the wall thickness of the replacement tube.

[0104] Furthermore, the replacement threshold Δ is 1.68, and the replacement evaluation index ZP is compared with the replacement threshold to output the durability level of the replacement tube. When ZP>Δ, it means that the durability level of the replacement tube is level two, the durability is unqualified, and the replacement tube needs to be readjusted and repaired; when ZP≤Δ, it means that the durability level of the replacement tube is level one, the durability is qualified, and the larger the value of the replacement evaluation index ZP, the worse the durability.

[0105] The present invention also provides a replacement evaluation system based on the MASHDPE pipe trenchless top expansion replacement process, which is used to perform the pipeline trenchless top expansion replacement process and a replacement evaluation method thereof, including:

[0106] A definition module, used to define a three-dimensional coordinate system for the entire displacement tube;

[0107] A coordinate acquisition module is used to collect the coordinate data of points on the inner circle of each replacement tube;

[0108] A fitting analysis module is used to perform correlation analysis on the inner wall coordinates and generate the centrifugal index of the replacement tube and the maximum centrifugal index of the replacement tube;

[0109] A comprehensive evaluation index module is used to perform correlation analysis on the centrifugal index of the replacement tube and the maximum centrifugal index of the replacement tube to generate a comprehensive centrifugal index of the replacement tube;

[0110] An acquisition module is used to acquire and analyze replacement data to generate a replacement pipe wall thickness index;

[0111] The replacement evaluation module is used to perform correlation analysis on the replacement pipe wall thickness index T and the comprehensive evaluation index ZPz, generate the replacement evaluation index ZP and output the replacement pipe durability grade.

[0112] The above formulas are all dimensionless and numerical calculations. The formula is a formula for the most recent real situation obtained by collecting a large amount of data and performing software simulation. The preset parameters in the formula are set by technicians in this field according to actual conditions.

[0113] The above embodiments may be implemented in whole or in part by software, hardware, firmware or any other combination thereof. When implemented by software, the above embodiments may be implemented in whole or in part in the form of a computer program product. Those skilled in the art may appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein may be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed by hardware or software methods depends on the specific application and design constraints of the technical solution.

[0114] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, and may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0115] The above description is only a specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application.

Claims

1. A pipeline trenchless top expansion replacement process and a replacement evaluation method thereof, characterized in that: The specific steps include: 1) Pipeline plugging: Use air bags to plug the upstream and downstream of the pipeline that needs to be replaced to prevent water or other substances from entering the construction area; 2) Pipeline desilting: remove sediment, debris and dirt in the pipeline; 3) Pipeline inspection: The pipeline inspection robot records pipeline damage information, providing a basis for subsequent solutions; 4) Plan deepening: Based on the pipeline inspection results, optimize the pipeline replacement plan and plan the construction process; 5) Pipeline structure restoration: Use a professional restoration guide head to restore the original pipeline with structural defects; 6) Crushing of original pipeline: Use professional crushing guide head to crush and clean the restored pipeline; 7) Top expansion cycle construction: Use a professional expansion guide head to radially expand and extrude the original pipe after cutting, and the top expansion cycle construction is completed to replace the original pipe with structural defects; 8) Water-tightness test; 9) Evaluation work after replacement; The post-replacement assessment work includes the following steps: S1. After the replacement of the replacement tube is completed, a three-dimensional coordinate system is established, and N sections of the replacement tube are placed in the three-dimensional coordinate system, wherein the centers of both ends of the replacement tube are placed on the X-axis; S2, uniformly collect 3*N groups of inner wall coordinates of the replacement tube, each section of the replacement tube has 3 groups of inner wall coordinates, and the plane formed by each group of inner wall coordinates is perpendicular to the X axis; S3, performing correlation analysis on the inner wall coordinates to generate a replacement tube centrifugal index LX, where the replacement tube centrifugal index LX is used to reflect the overall deflection degree of the replacement tube; S4. performing correlation analysis on the inner wall coordinates to generate a maximum centrifugal index ZLX of the replacement tube, where the maximum centrifugal index ZLX of the replacement tube is used to reflect the maximum degree of deflection of the replacement tube; S5. performing correlation analysis on the maximum centrifugal index of the replacement tube and the centrifugal index of the replacement tube to generate a comprehensive centrifugal index ZZL of the replacement tube, wherein the comprehensive centrifugal index ZZL of the replacement tube is used to reflect the degree of eccentricity of the replacement tube; S6, collecting replacement data; S7, analyzing the replacement data to generate a replacement pipe wall thickness index, where the replacement pipe wall thickness index T is used to reflect the pipe wall thickness coefficient required under the current replacement condition; S8, performing correlation analysis on the replacement pipe wall thickness index T and the comprehensive evaluation index ZPz to generate a replacement evaluation index ZP; S9. Compare the replacement evaluation index ZP with the replacement threshold value, and output the durability grade of the replacement pipe.

2. The pipeline trenchless top expansion replacement process and replacement evaluation method according to claim 1 are characterized by: In S2, all inner wall coordinate points are numbered, wherein the inner wall coordinate point of the i-th group is numbered as Indicates that its inner wall coordinates are 3. The pipeline trenchless top expansion replacement process and replacement evaluation method according to claim 2 are characterized by: Perform correlation analysis on the inner wall coordinates to generate the center coordinates of the i-th group of inner wall coordinate points The formula is: After combining the above formulas, y is output through matlabe software i and z i The specific value of the center coordinate of the i-th group of inner wall coordinate points Used to reflect the center point position of the inner wall of the displacement tube.

4. The pipeline trenchless top expansion replacement process and replacement evaluation method according to claim 3 are characterized by: For the i-th group of inner wall coordinate points, the center coordinates Correlation analysis was performed to generate the replacement tube centrifugal index LX, based on the formula: The replacement tube centrifugal index LX is used to reflect the overall deflection of the replacement tube.

5. The pipeline trenchless top expansion replacement process and replacement evaluation method according to claim 4 are characterized by: For the i-th group of inner wall coordinate points, the center coordinates Correlation analysis was performed to generate the maximum centrifugal index ZLX of the replacement tube, based on the formula: The maximum centrifugal index ZLX of the replacement tube is used to reflect the maximum deflection degree of the replacement tube, where max(*) is used to indicate the maximum value of *, and min(*) is used to indicate the minimum value of *; The correlation analysis of the maximum centrifugal index and the centrifugal index of the replacement tube was performed to generate the comprehensive centrifugal index ZZL of the replacement tube. The formula is: ZZL = LX * ZLX + LX ZLX The comprehensive centrifugal index ZZL of the replacement tube is used to reflect the degree of eccentricity of the replacement tube.

6. The pipeline trenchless top expansion replacement process and replacement evaluation method according to claim 5 are characterized by: Collect and analyze replacement data, including groundwater level height H w , pipeline laying depth H, pipe top soil thickness H s , ellipticity reduction factor C, water buoyancy factor R W , elastic modulus E of the pipeline, elastic support coefficient B, elastic modulus E of the soil beside the pipe T , generate the replacement pipe wall thickness index T, based on the formula: in, The replacement pipe wall thickness index T is used to reflect the pipe wall thickness index required under current conditions.

7. The pipeline trenchless top expansion replacement process and replacement evaluation method according to claim 6 are characterized by: The replacement evaluation index ZP is generated by performing a correlation analysis on the replacement tube wall thickness index T and the replacement tube comprehensive centrifugal index ZZL. The formula is as follows: The replacement evaluation index ZP is used to reflect the durability index of the replacement tube under the current replacement process, where G is the wall thickness of the replacement tube.

8. The pipeline trenchless top expansion replacement process and replacement evaluation method according to claim 7 are characterized by: The replacement threshold Δ is 1.

68. The replacement evaluation index ZP is compared with the replacement threshold to output the durability level of the replacement tube. When ZP>Δ, it means that the durability level of the replacement tube is level two, the durability is unqualified, and the replacement tube needs to be readjusted and repaired; when ZP≤Δ, it means that the durability level of the replacement tube is level one, and the durability is qualified.

9. A pipeline trenchless top expansion replacement process and a replacement evaluation system thereof, used to execute the pipeline trenchless top expansion replacement process and a replacement evaluation method thereof as claimed in claim 1, characterized in that: include: A definition module, used to define a three-dimensional coordinate system for the entire displacement tube; A coordinate acquisition module is used to collect the coordinate data of points on the inner circle of each replacement tube; A fitting analysis module is used to perform correlation analysis on the inner wall coordinates and generate the centrifugal index of the replacement tube and the maximum centrifugal index of the replacement tube; A comprehensive evaluation index module is used to perform correlation analysis on the centrifugal index of the replacement tube and the maximum centrifugal index of the replacement tube to generate a comprehensive centrifugal index of the replacement tube; An acquisition module is used to acquire and analyze replacement data to generate a replacement pipe wall thickness index; The replacement evaluation module is used to perform correlation analysis on the replacement pipe wall thickness index T and the comprehensive evaluation index ZPz, generate the replacement evaluation index ZP and output the replacement pipe durability grade.

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