Fuel gas trenchless repair technology feasibility judgment and selection method and device

Abstract

The invention provides a feasibility judgment and selection method and device for a non-excavation repair technology for fuel gas. The method comprises the steps that a basic information base is established; according to environmental data of a to-be-repaired pipeline, basic parameters are determined in combination with the basic information base; according to the basic parameters, an urban combustion pipeline trenchless repair experiment platform is generated, and the urban combustion pipeline trenchless repair experiment platform is used for simulating the to-be-repaired pipeline; and carrying out feasibility judgment on the to-be-repaired pipeline and the repair technology by utilizing the urban combustion pipeline trenchless repair experiment platform. According to the method, the feasibility of the non-excavation repair technology for the fuel gas can be judged, manpower and material resources are saved, and the use efficiency of the non-excavation repair technology for the fuel gas is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of trenchless repair of gas pipelines, and in particular to a method and device for determining the feasibility and selecting trenchless repair technology for gas. Background Art

[0002] Urban pipelines are one of the important infrastructures that support social development and ensure people's lives. Pipeline maintenance is a necessary means to ensure its normal mechanism and function. Usually, pipeline repair work is mainly carried out through two repair methods: excavation repair and non-excavation repair.

[0003] Trenchless repair is a low-impact, low-maintenance repair method for infrastructure that has gradually gained attention. However, before conducting trenchless repair, how to judge whether the trenchless repair technology is feasible has become a more important link. Conducting trenchless repair on a feasible basis can save manpower and material resources. Therefore, how to judge whether the trenchless repair technology is feasible has become an urgent problem to be solved. Summary of the invention

[0004] The present invention aims to provide a method and device for determining the feasibility and selecting trenchless repair technology for gas that overcomes the above-mentioned problems or at least partially solves the above-mentioned problems.

[0005] To achieve the above object, the technical solution of the present invention is specifically implemented as follows:

[0006] One aspect of the present invention provides a method for determining the feasibility and selecting a trenchless repair technology for gas, comprising:

[0007] Establishing a basic information database, the basic information database includes: pressure level system, pipe material, pipe diameter, elbow angle and curvature radius;

[0008] According to the environmental data of the pipeline to be repaired, combined with the basic information database, basic parameters are determined, and the basic parameters include: the pressure level of the pipeline to be repaired, the elbow angle of the pipeline to be repaired, the curvature radius of the pipeline to be repaired, the number of elbows of the pipeline to be repaired, the elbow interval of the pipeline to be repaired, the number of observation holes, the position of the observation holes and the size of the observation holes;

[0009] According to the basic parameters, a trenchless repair experimental platform for urban gas pipelines is generated, and the trenchless repair experimental platform for urban gas pipelines is used to simulate the pipeline to be repaired;

[0010] Using the urban gas pipeline trenchless repair experimental platform to determine the feasibility of the pipeline to be repaired;

[0011] Wherein, the feasibility determination of the pipeline to be repaired and the repair technology by using the urban gas pipeline trenchless repair experimental platform includes:

[0012] Determining the passability indicators of the pipeline to be repaired and the repair technology;

[0013] Determine the roundness index of the pipeline to be repaired and the repair technology;

[0014] The air tightness index of the pipeline to be repaired and the repair technology is determined.

[0015] Optionally, the elbow interval of the pipeline to be repaired is calculated by the following formula:

[0016]

[0017] Wherein: L is the distance of the straight pipe section between two adjacent elbows, R is the radius of curvature of the elbow, n is the total number of elbows in the pipeline to be repaired, and t is the safety factor.

[0018] Optionally, the position of the observation hole is set in the following manner:

[0019] Use the removable part above the pipe fitting as an observation hole at the place where the pipe fitting is cut off;

[0020] An observation hole is set in the middle of the elbow, and observation holes are set at the 0 o'clock, 3 o'clock and 9 o'clock directions of the elbow. At least one elbow is set with both inner and outer observation holes;

[0021] Observation holes are set at 3 o'clock and 9 o'clock positions on the straight pipe section between the two elbows and the straight pipe section after the reducer.

[0022] Optionally, the size of the observation hole is set in the following manner:

[0023] If it is a straight pipe section or an elbow with R=1.5D, the observation hole is set to have a length of L=100-150mm and a width of W=(4%-5%)*Π*D;

[0024] If it is an R=5D elbow, the observation hole is set to have a length of L=2*Π*D and a width of W=(4%-5%)*Π*D;

[0025] Where D is the pipe diameter and R is the radius of curvature of the elbow.

[0026] Optionally, the determining of the passability index of the pipeline to be repaired and the repair technology includes:

[0027] Determine speed and traction;

[0028] Determine surface scratches;

[0029] Wherein, the determining of speed and traction force includes:

[0030] Whether the speed of the repair material passing through the cut pipe and elbow is within the preset range;

[0031] During the pulling process, whether the pulling force is always less than the maximum pulling force F allowed by the repair material, wherein the maximum pulling force F is calculated by the following formula:

[0032] F=nN1F0

[0033] Among them, F is the allowable pulling force, F0 is the average breaking strength of a single warp fiber, n is the number of warp fiber strands, and N1 is the safety factor.

[0034] Optionally, the determining of the roundness index of the pipeline to be repaired and the repair technology includes:

[0035] Observe from the observation hole to see if all the tapes have collapsed and whether the fit between the straight pipe section and the elbow meets the preset conditions.

[0036] Optionally, the determining of the air tightness index of the pipeline to be repaired and the repair technology includes:

[0037] Whether the corrected pressure drop is less than a preset value, wherein the corrected pressure drop is calculated by the following formula:

[0038]

[0039] Wherein, P' is the corrected pressure drop, H1 and H2 are the pressure gauge readings at the beginning and end of the test, B1 and B2 are the barometer readings at the beginning and end of the test, and t1 and t2 are the medium temperatures in the pipe at the beginning and end of the test.

[0040] Optionally, the method further includes: forming qualitative and quantitative evaluation conclusions on whether the trenchless repair technology is feasible, and outputting the evaluation conclusions.

[0041] Another aspect of the present invention provides a device for determining the feasibility and selecting a trenchless repair technology for gas, comprising:

[0042] An establishment module is used to establish a basic information database, wherein the basic information database includes: pressure level system, pipe material, pipe diameter, elbow angle and curvature radius;

[0043] A determination module, used to determine basic parameters according to the environmental data of the pipeline to be repaired and in combination with the basic information database, wherein the basic parameters include: the pressure level of the pipeline to be repaired, the elbow angle of the pipeline to be repaired, the curvature radius of the pipeline to be repaired, the number of elbows of the pipeline to be repaired, the elbow interval of the pipeline to be repaired, the number of observation holes, the position of the observation holes and the size of the observation holes;

[0044] A generation module, used to generate a trenchless repair experimental platform for urban gas pipelines according to the basic parameters, wherein the trenchless repair experimental platform for urban gas pipelines is used to simulate the pipeline to be repaired;

[0045] A determination module, used to determine the feasibility of the pipeline to be repaired and the repair technology by using the urban gas pipeline trenchless repair experimental platform;

[0046] The determination module uses the urban gas pipeline trenchless repair experimental platform to determine the feasibility of the pipeline to be repaired and the repair technology in the following manner:

[0047] Determining the passability indicators of the pipeline to be repaired and the repair technology;

[0048] Determine the roundness index of the pipeline to be repaired and the repair technology;

[0049] The air tightness index of the pipeline to be repaired and the repair technology is determined.

[0050] Optionally, the device further comprises: an evaluation module, configured to form qualitative and quantitative evaluation conclusions on whether the trenchless repair technology is feasible, and output the evaluation conclusions.

[0051] It can be seen that through the feasibility determination and selection method and device of non-excavation repair technology for gas provided by the present invention, the feasibility of non-excavation repair technology for gas can be determined, manpower and material resources can be saved, and the efficiency of the use of non-excavation repair technology for gas can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0053] Figure 1 A flow chart of a method for determining the feasibility and selecting a trenchless repair technology for gas provided in an embodiment of the present invention;

[0054] Figure 2 A schematic diagram of commonly used elbow angles for town gas pipelines provided in an embodiment of the present invention;

[0055] Figure 3 A schematic diagram of the shape of the observation hole of the straight pipe section provided in an embodiment of the present invention;

[0056] Figure 4 A schematic diagram of the shape of the elbow observation hole provided in an embodiment of the present invention;

[0057] Figure 5 A schematic diagram of the experimental platform design provided by an embodiment of the present invention;

[0058] Figure 6 A schematic diagram of the structure of a feasibility determination and selection device for trenchless repair technology for gas provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0059] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0060] Figure 1 A flowchart showing the feasibility determination and selection method of the trenchless repair technology for gas provided in an embodiment of the present invention is shown. Figure 1 The feasibility determination and selection method of the trenchless repair technology for gas provided in the embodiment of the present invention includes:

[0061] S1, establishing a basic information database, the basic information database includes: pressure level system, pipe material, pipe diameter, elbow angle and curvature radius;.

[0062] Specifically, the present invention first designs a basic information database for non-excavation repair experiments of urban gas pipelines, prefabricates relevant information on non-excavation of urban gas pipelines into a basic database, and provides a basis for selecting various parameters for subsequent experimental platform design.

[0063] The basic information database includes but is not limited to:

[0064] 1. Pressure level system and pipe material selection

[0065] The non-excavation repair pressure level classification of urban gas pipelines can be divided into 4 levels. The first level is the medium and low pressure level, covering the pressure of 0.4MPa and below, and the pipe material is #20 steel or Q235B; the second level is the medium and high pressure level, covering the pressure of 0.4-1.6MPa, and the pipe material is #20 steel or L245M; the third level is the high pressure B level, covering the pressure of 1.6-2.5MPa, and the pipe material is #20 steel or L290M; the fourth level is the high pressure A level, covering the pressure of 2.5-4MPa, and the pipe material is Q345D or L360M.

[0066] 2. Elbow angle and curvature radius

[0067] like Figure 2As shown in the figure, the commonly used elbow angles of urban gas pipelines are 22.5°, 45°, and 90°, and the difficulty of trenchless repair materials passing through elbows is ranked as 90°>45°>22.5°. According to the different pressure levels, 90° elbows are mainly divided into two types of curvature radii. The 90° elbows of medium and low pressure gas pipelines are mainly 1.5D in curvature radius, and the 90° elbows of medium and high pressure gas pipelines and above are mainly 5D in curvature radius.

[0068] 3. Other specifications:

[0069] It mainly includes pipe diameter and wall thickness. The pipe diameter needs to be determined according to the pipe diameter to be repaired. The wall thickness has no effect on the simulation. After the pipe diameter is determined, it can be set according to the standard wall thickness.

[0070] S2, according to the environmental data of the pipeline to be repaired, combined with the basic information database, determine basic parameters, the basic parameters include: the pressure level of the pipeline to be repaired, the elbow angle of the pipeline to be repaired, the curvature radius of the pipeline to be repaired, the number of elbows of the pipeline to be repaired, the elbow interval of the pipeline to be repaired, the number of observation holes, the position of the observation holes and the size of the observation holes.

[0071] The present invention completes the basic parameter design of the overall experimental platform through basic information database and formula design. The present invention completes the basic parameter selection such as pipe material, elbow angle and corresponding curvature radius information according to the situation of the pipeline to be repaired (existing environmental data) in combination with the basic information database. Among them, the environmental data mainly refers to the pipe diameter, pressure, whether there is an elbow and the elbow angle, and other pipe fittings information. The diameter of the simulated pipeline is determined according to the pipe diameter. The pipe material is determined according to the pressure, and if there is an elbow, the curvature radius of the elbow can be determined according to the pressure level system. According to other pipe fittings information, it can be determined whether the simulated pipeline contains the pipe fitting.

[0072] The basic parameters include but are not limited to:

[0073] 1. Number and spacing of elbows

[0074] Combined with the actual laying status of pipelines, the total number of elbows should not be too many, and should not exceed 5. The specific principles are as follows:

[0075] 1. At least one 90° elbow should be provided;

[0076] 2. The total number of 22.5° and 45° elbows should be no less than 2.

[0077] As an optional implementation of the embodiment of the present invention, the elbow interval of the pipeline to be repaired is calculated by the following formula:

[0078]

[0079] Wherein: L is the distance of the straight pipe section between two adjacent elbows, R is the radius of curvature of the elbow, n is the total number of elbows in the pipeline to be repaired, and t is the safety factor.

[0080] The more elbows there are, the greater the traction force required. At the same time, the distance between the straight pipe sections of adjacent elbows should not be too short, otherwise the required traction force will increase significantly. The length of the straight pipe section between elbows is set with reference to the pipeline to be repaired and is designed according to the following formula:

[0081]

[0082] Where:

[0083] L----the distance of the straight pipe section between two adjacent elbows (m);

[0084] R----Elbow curvature radius (m);

[0085] n----The total number of elbows in the experimental tube;

[0086] t----Safety factor, when R=1.5D, take 0.1-0.5, when R=5D, take 0.5-1

[0087] 2. Other design requirements

[0088] 1. Prefabricated parts

[0089] There are mainly two types of prefabricated parts for gas pipelines: wiring and tangent. Wiring fittings are mainly used for new branches. Trenchless repair technology is currently not suitable for pipelines with wiring fittings. If there are any, they need to be disconnected at the branch and repaired in sections. Therefore, the platform only includes tangent fittings when designing prefabricated parts.

[0090] 2. Reducer

[0091] Based on the principles of trenchless repair technology and the condition of the pipeline to be repaired, determine whether to add a reducer to the experimental platform.

[0092] Among them, if the technical principle cannot pass the reducer, then the pipe needs to be cut off here; whether the pipeline to be repaired allows the flow rate to be reduced, if not, it needs to be disconnected; if the pipeline to be repaired allows the flow rate to be reduced after repair, and the technical principle is acceptable, then the simulation pipeline needs to add a reducer.

[0093] 3. Passability and safety related parameters

[0094] 1. Design principles for the number and location of observation holes

[0095] (1) The number of observation holes should be determined based on the number of elbows and pipe fittings to avoid affecting the pipeline structure and strength test safety.

[0096] (2) Design principles for observation hole location

[0097] As an optional implementation of the embodiment of the present invention, the position of the observation hole is set in the following manner:

[0098] Use the removable part above the pipe fitting as an observation hole at the place where the pipe fitting is cut off;

[0099] An observation hole is set in the middle of the elbow, and observation holes are set at the 0 o'clock, 3 o'clock and 9 o'clock directions of the elbow. At least one elbow is set with both inner and outer observation holes;

[0100] Observation holes are set at 3 o'clock and 9 o'clock positions on the straight pipe section between the two elbows and the straight pipe section after the reducer.

[0101] Specifically, at the cut-off point of the pipe fitting, observation can be carried out by utilizing the detachable method above the pipe fitting, without the need to provide an additional observation hole.

[0102] The observation hole at the elbow is set in the middle, and observation holes must be set at the 0, 3, and 9 o'clock directions of the elbow. The number of observation holes at the same elbow should not exceed 2 to avoid affecting the structural strength of the elbow. At least one elbow should be set with inner and outer observation holes at the same time to observe the fit of key parts.

[0103] Observation holes are set at 3 o'clock and 9 o'clock positions on the straight pipe section between the two elbows and the straight pipe section after the reducer to observe whether the expansion of the repair material is symmetrical.

[0104] (3) Observation hole size design principles (tube diameter, curvature radius)

[0105] As an optional implementation of the embodiment of the present invention, the size of the observation hole is set in the following manner:

[0106] If it is a straight pipe section or an elbow with R=1.5D, the observation hole is set to have a length of L=100-150mm and a width of W=(4%-5%)*Π*D;

[0107] If it is an R=5D elbow, the observation hole is set to have a length of L=2*Π*D and a width of W=(4%-5%)*Π*D;

[0108] Where D is the pipe diameter and R is the radius of curvature of the elbow.

[0109] A. Straight pipe section

[0110] The shape of the observation hole is Figure 3 As shown, the length L = 100-150 mm, the width W (semicircle diameter) = (4%-5%)*Π*D, and D is the pipe diameter.

[0111] B, R = 1.5D elbow

[0112] The turning radius is small, and the same observation hole size as the straight pipe section can be used, with a length of L = 100-150 mm and a width of W (semicircle diameter) = (4%-5%)*Π*D.

[0113] C, R = 5D elbow (R is the radius of curvature of the elbow)

[0114] The shape of the observation hole is Figure 4 As shown, the length L = 2*Π*D, and the width W (semicircle diameter) = (4%-5%)*Π*D.

[0115] S3, generating a trenchless repair experimental platform for urban gas pipelines according to the basic parameters, wherein the trenchless repair experimental platform for urban gas pipelines is used to simulate the pipeline to be repaired.

[0116] Specifically, the present invention completes the design of a complete urban gas pipeline non-excavation repair experimental platform by inputting the above parameters (pressure level system, elbow angle, curvature radius, number of elbows, elbow spacing, etc.), such as Figure 5 shown.

[0117] S4, using the urban gas pipeline trenchless repair experimental platform to determine the feasibility of the pipeline to be repaired and the repair technology;

[0118] Wherein, the feasibility determination of the pipeline to be repaired and the repair technology by using the urban gas pipeline trenchless repair experimental platform includes:

[0119] Determining the passability indicators of the pipeline to be repaired and the repair technology;

[0120] Determine the roundness index of the pipeline to be repaired and the repair technology;

[0121] The air tightness index of the pipeline to be repaired and the repair technology is determined.

[0122] Specifically, the present invention uses the experimental platform to conduct feasibility determination tests for a certain repair technology, and designs the following three categories, including both quantitative and qualitative indicators.

[0123] Indicators include but are not limited to:

[0124] 1. Passability Index

[0125] 1. Speed ​​and traction

[0126] As an optional implementation of the embodiment of the present invention, the determination of the passability index of the pipeline to be repaired and the repair technology includes:

[0127] Determine speed and traction;

[0128] Determine surface scratches;

[0129] Wherein, the determining of speed and traction force includes:

[0130] Whether the speed of the repair material passing through the cut pipe and elbow is within the preset range;

[0131] During the pulling process, whether the pulling force is always less than the maximum pulling force F allowed by the repair material, wherein the maximum pulling force F is calculated by the following formula:

[0132] F=nN1F0

[0133] Among them, F is the allowable pulling force, F0 is the average breaking strength of a single warp fiber, n is the number of warp fiber strands, and N1 is the safety factor.

[0134] In specific implementation, the speed of the repair material (such as fiber-reinforced plastic hose, HDPE pipe) is maintained in the range of 3-5m / min when passing through the cut-off pipe fittings and elbows, without any obvious speed drop, and the winch works smoothly without any jamming.

[0135] During the entire pulling process, the pulling force is always less than the maximum pulling force F allowed by the repair material. F should be calculated as follows:

[0136] F=nN1F0

[0137] Where:

[0138] F----allowable drag force (N);

[0139] F0----average breaking strength of single fiber in warp direction, in Newton (N);

[0140] n-----number of warp fiber strands;

[0141] N1----Safety factor, generally 0.6-0.8.

[0142] 2. Surface scratches

[0143] The end glass fiber tape is fully functional, the tape may be damaged to some extent but can maintain the U-shape of the liner pipe.

[0144] There are no serious scratches on the end of the repair material. When the length of the repaired pipe is L, the scratch length on the end is less than 1‰*L, and the scratch depth does not reach the middle braided layer.

[0145] 2. Roundness index

[0146] As an optional implementation of the embodiment of the present invention, the determination of the roundness index of the pipeline to be repaired and the repair technology includes:

[0147] Observe from the observation hole to see if all the tapes have collapsed and whether the fit between the straight pipe section and the elbow meets the preset conditions.

[0148] In specific implementation, the degree of fit is determined by the following method:

[0149] Observe from the observation hole and the tape is completely broken. The liner pipe in the straight pipe section must fit tightly with the inner wall of the steel pipe (except the reducer). The fitting conditions at the elbow are shown in Table 1.

[0150] Table 1

[0151]

[0152] 3. Air tightness index

[0153] As an optional implementation of the embodiment of the present invention, the determination of the air tightness index of the pipeline to be repaired and the repair technology includes:

[0154] Whether the corrected pressure drop is less than a preset value, wherein the corrected pressure drop is calculated by the following formula:

[0155]

[0156] Wherein, P' is the corrected pressure drop, H1 and H2 are the pressure gauge readings at the beginning and end of the test, B1 and B2 are the barometer readings at the beginning and end of the test, and t1 and t2 are the medium temperatures in the pipe at the beginning and end of the test.

[0157] During specific implementation, based on the design pressure PN of the pipeline to be repaired, the air tightness test pressure is 1.15PN and the pressure holding time is 24 hours. If the experimental platform is an overhead pipeline on the ground, the pressure will fluctuate greatly with temperature, and the test cycle should be no less than 72 hours to eliminate the impact of temperature differences between day and night.

[0158] After both ends of the pipeline are sealed, use an air compressor to slowly pressurize it. Stop pressurizing when the pressure reaches 1.15PN. After the pressure in the pipe rises to the tightness test pressure, start recording after the temperature and pressure stabilize. Use the intelligent Beidou air tightness monitoring device to monitor the experimental platform and determine whether it meets the air tightness requirements based on the pressure and temperature curves.

[0159] There are two types of air tightness determination methods. When the test platform is a buried pipeline and there are no prefabricated parts and reducers, type (1) determination method is applicable. When none of the above conditions are met, type (2) determination method is applicable:

[0160] (1) According to the industry standard CJJ33 "Construction and Acceptance Specifications for Urban Gas Transmission and Distribution Projects", when the corrected pressure drop is less than 133Pa, it is qualified. The corrected pressure drop should be determined by the following formula:

[0161]

[0162] Where P'--corrected pressure drop (Pa);

[0163] H1, H2--pressure gauge readings at the beginning and end of the test (Pa);

[0164] B1, B2--barometer readings at the beginning and end of the test (Pa);

[0165] t1, t2 – temperature of medium in the pipe at the beginning and end of the test (°C).

[0166] (2) Draw a pressure and temperature curve based on the continuous monitoring data. When the material expansion is relatively stable (≥24h), the difference between the pressure value corresponding to the highest temperature on the second day and the pressure value corresponding to the same temperature on the previous day in the monitoring data of the next two days is not less than 133Pa.

[0167] As an optional implementation of an embodiment of the present invention, the method for determining the feasibility and selecting trenchless repair technology for gas provided in the embodiment of the present invention also includes: forming qualitative and quantitative evaluation conclusions on whether the trenchless repair technology is feasible, and outputting the evaluation conclusions.

[0168] Specifically, qualitative and quantitative evaluation conclusions are formed on whether the trenchless repair technology is feasible based on the simulation basis and test data sources.

[0169] The conclusion may include but is not limited to:

[0170] 1. Statistics of pipelines to be upgraded

[0171] (1) Design pressure and length of technical transformation pipeline

[0172] (2) The number of elbows and other pipe fittings included in the pipeline

[0173] (3) Angle and radius of curvature of the bend

[0174] (4) Whether the pipeline includes a branch line

[0175] (5) Original pipe material

[0176] For example: In terms of materials: the main distinction is between steel pipes and PE pipes. Currently, the CJJ14 technical regulations are being revised. After the release, it will determine which trenchless technologies can be used for steel pipes and which technologies can be used for PE pipes.

[0177] Ambient temperature: The buried depth of gas pipelines is generally about 1.5-2 meters, and some pipelines may be deeper. The ambient temperature may change, but not significantly. On the one hand, temperature changes themselves will cause pressure changes; on the other hand, the repair material may expand and contract when the ambient temperature changes, which will eventually cause pressure changes. Therefore, temperature correction is required when quantitatively evaluating air tightness.

[0178] Soil parameters had no effect on the qualitative and quantitative evaluations.

[0179] Second and third level indicators determine whether the pipe section to be modified is suitable for this technology:

[0180] 1. Basic condition indicators

[0181] (1) It is not applicable when the pipeline to be repaired has large-area perforations and local structural strength loss

[0182] (2) This does not apply when there are any structures or devices (such as pumping cylinders) inside the pipeline to be repaired that block the passage of the repair material.

[0183] (3) If there are branch lines and connecting pipes, the pipes must be cut and repaired at the branch lines or pipes.

[0184] 2. Passability index:

[0185] (1) The speed and traction meet the above criteria

[0186] (2) The material is complete and meets the above criteria

[0187] 3. Performance indicators:

[0188] (1) The pipe fit meets the above criteria

[0189] (2) The airtightness test meets the above-mentioned judgment indicators.

[0190] It can be seen that the feasibility determination and selection method of trenchless repair technology for gas provided by the embodiment of the present invention can determine the feasibility of trenchless repair technology for gas, save manpower and material resources, and improve the efficiency of using trenchless repair technology for gas.

[0191] Figure 6 The schematic diagram of the structure of the device for determining the feasibility and selecting the trenchless repair technology for gas provided by the embodiment of the present invention is shown. The device for determining the feasibility and selecting the trenchless repair technology for gas uses the above method. The following is a brief description of the structure of the device for determining the feasibility and selecting the trenchless repair technology for gas. For other matters not covered, please refer to the relevant description in the above method for determining the feasibility and selecting the trenchless repair technology for gas. Figure 6 The feasibility determination and selection device of the trenchless repair technology for gas provided in the embodiment of the present invention comprises:

[0192] An establishment module is used to establish a basic information database, wherein the basic information database includes: pressure level system, pipe material, pipe diameter, elbow angle and curvature radius;

[0193] A determination module, used to determine basic parameters according to the environmental data of the pipeline to be repaired and in combination with the basic information database, wherein the basic parameters include: the pressure level of the pipeline to be repaired, the elbow angle of the pipeline to be repaired, the curvature radius of the pipeline to be repaired, the number of elbows of the pipeline to be repaired, the elbow interval of the pipeline to be repaired, the number of observation holes, the position of the observation holes and the size of the observation holes;

[0194] A generation module, used to generate a trenchless repair experimental platform for urban gas pipelines according to the basic parameters, wherein the trenchless repair experimental platform for urban gas pipelines is used to simulate the pipeline to be repaired;

[0195] A determination module, used to determine the feasibility of the pipeline to be repaired and the repair technology by using the urban gas pipeline trenchless repair experimental platform;

[0196] The determination module uses the urban gas pipeline trenchless repair experimental platform to determine the feasibility of the pipeline to be repaired and the repair technology in the following manner:

[0197] Determining the passability indicators of the pipeline to be repaired and the repair technology;

[0198] Determine the roundness index of the pipeline to be repaired and the repair technology;

[0199] The air tightness index of the pipeline to be repaired and the repair technology is determined.

[0200] As an optional implementation of the embodiment of the present invention, the determination module calculates the elbow interval of the pipeline to be repaired in the following manner:

[0201]

[0202] Wherein: L is the distance of the straight pipe section between two adjacent elbows, R is the radius of curvature of the elbow, n is the total number of elbows in the pipeline to be repaired, and t is the safety factor.

[0203] As an optional implementation of the embodiment of the present invention, the determination module sets the observation hole position in the following manner:

[0204] Use the removable part above the pipe fitting as an observation hole at the place where the pipe fitting is cut off;

[0205] An observation hole is set in the middle of the elbow, and observation holes are set at the 0 o'clock, 3 o'clock and 9 o'clock directions of the elbow. At least one elbow is set with both inner and outer observation holes;

[0206] Observation holes are set at 3 o'clock and 9 o'clock positions on the straight pipe section between the two elbows and the straight pipe section after the reducer.

[0207] As an optional implementation of the embodiment of the present invention, the determination module sets the observation hole size in the following manner:

[0208] If it is a straight pipe section or an elbow with R=1.5D, the observation hole is set to have a length of L=100-150mm and a width of W=(4%-5%)*Π*D;

[0209] If it is an R=5D elbow, the observation hole is set to have a length of L=2*Π*D and a width of W=(4%-5%)*Π*D;

[0210] Where D is the pipe diameter and R is the radius of curvature of the elbow.

[0211] As an optional implementation of the embodiment of the present invention, the determination module determines the passability index of the pipeline to be repaired and the repair technology in the following manner:

[0212] Determine speed and traction;

[0213] Determine surface scratches;

[0214] Wherein, the determining of speed and traction force includes:

[0215] Whether the speed of the repair material passing through the cut pipe and elbow is within the preset range;

[0216] During the pulling process, whether the pulling force is always less than the maximum pulling force F allowed by the repair material, wherein the maximum pulling force F is calculated by the following formula:

[0217] F=nN1F0

[0218] Among them, F is the allowable pulling force, F0 is the average breaking strength of a single warp fiber, n is the number of warp fiber strands, and N1 is the safety factor.

[0219] As an optional implementation of the embodiment of the present invention, the determination module determines the roundness index of the pipeline to be repaired and the repair technology in the following manner:

[0220] Observe from the observation hole to see if all the tapes have collapsed and whether the fit between the straight pipe section and the elbow meets the preset conditions.

[0221] As an optional implementation of the embodiment of the present invention, the determination module determines the air tightness index of the pipeline to be repaired and the repair technology in the following manner:

[0222] Whether the corrected pressure drop is less than a preset value, wherein the corrected pressure drop is calculated by the following formula:

[0223]

[0224] Wherein, P' is the corrected pressure drop, H1 and H2 are the pressure gauge readings at the beginning and end of the test, B1 and B2 are the barometer readings at the beginning and end of the test, and t1 and t2 are the medium temperatures in the pipe at the beginning and end of the test.

[0225] As an optional implementation manner of an embodiment of the present invention, the feasibility determination and selection of trenchless repair technology for gas provided in the embodiment of the present invention also includes: an evaluation module for forming qualitative and quantitative evaluation conclusions on whether the trenchless repair technology is feasible, and outputting the evaluation conclusions.

[0226] It can be seen that the feasibility determination and selection device for non-excavation repair technology for gas provided by the embodiment of the present invention can determine the feasibility of non-excavation repair technology for gas, save manpower and material resources, and improve the efficiency of using non-excavation repair technology for gas.

[0227] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A method for determining the feasibility and selecting a trenchless repair technology for gas, characterized in that: include: Establishing a basic information database, the basic information database includes: pressure level system, pipe material, pipe diameter, elbow angle and curvature radius; According to the environmental data of the pipeline to be repaired, combined with the basic information database, basic parameters are determined, and the basic parameters include: the pressure level of the pipeline to be repaired, the elbow angle of the pipeline to be repaired, the curvature radius of the pipeline to be repaired, the number of elbows of the pipeline to be repaired, the elbow interval of the pipeline to be repaired, the number of observation holes, the position of the observation holes and the size of the observation holes; According to the basic parameters, a trenchless repair experimental platform for urban gas pipelines is generated, and the trenchless repair experimental platform for urban gas pipelines is used to simulate the pipeline to be repaired; The feasibility of the pipeline to be repaired and the repair technology is determined by using the urban gas pipeline trenchless repair experimental platform; Wherein, the feasibility determination of the pipeline to be repaired and the repair technology by using the urban gas pipeline trenchless repair experimental platform includes: Determining the passability indicators of the pipeline to be repaired and the repair technology; Determine the roundness index of the pipeline to be repaired and the repair technology; The air tightness index of the pipeline to be repaired and the repair technology is determined.

2. The method according to claim 1, characterized in that The elbow interval of the pipeline to be repaired is calculated by the following formula: Wherein: L is the distance of the straight pipe section between two adjacent elbows, R is the radius of curvature of the elbow, n is the total number of elbows in the pipeline to be repaired, and t is the safety factor.

3. The method according to claim 2, characterized in that The position of the observation hole is set in the following manner: Use the removable part above the pipe fitting as an observation hole at the place where the pipe fitting is cut off; An observation hole is set in the middle of the elbow, and observation holes are set at the 0 o'clock, 3 o'clock and 9 o'clock directions of the elbow. At least one elbow is set with both inner and outer observation holes; Observation holes are set at 3 o'clock and 9 o'clock positions on the straight pipe section between the two elbows and the straight pipe section after the reducer.

4. The method according to claim 3, characterized in that: The size of the observation hole is set in the following manner: If it is a straight pipe section or an elbow with R=1.5D, the observation hole is set to have a length of L=100-150mm and a width of W=(4%-5%)*Π*D; If it is an R=5D elbow, the observation hole is set to have a length of L=2*Π*D and a width of W=(4%-5%)*Π*D; Where D is the pipe diameter and R is the radius of curvature of the elbow.

5. The method according to claim 4, characterized in that The determination of the passability index of the pipeline to be repaired and the repair technology includes: Determine speed and traction; Determine surface scratches; Wherein, the determining of speed and traction force includes: Whether the speed of the repair material passing through the cut pipe and elbow is within the preset range; During the pulling process, whether the pulling force is always less than the maximum pulling force F allowed by the repair material, wherein the maximum pulling force F is calculated by the following formula: F=nN1F0 Among them, F is the allowable pulling force, F0 is the average breaking strength of a single warp fiber, n is the number of warp fiber strands, and N1 is the safety factor.

6. The method according to claim 4, characterized in that The determination of the roundness index of the pipeline to be repaired and the repair technology includes: Observe from the observation hole to see if all the tapes have collapsed and whether the fit between the straight pipe section and the elbow meets the preset conditions.

7. The method according to claim 4, characterized in that The determination of the air tightness index of the pipeline to be repaired and the repair technology includes: Whether the corrected pressure drop is less than a preset value, wherein the corrected pressure drop is calculated by the following formula: Wherein, P' is the corrected pressure drop, H1 and H2 are the pressure gauge readings at the beginning and end of the test, B1 and B2 are the barometer readings at the beginning and end of the test, and t1 and t2 are the medium temperatures in the pipe at the beginning and end of the test.

8. The method according to any one of claims 1 to 7, characterized in that: Also includes: A qualitative and quantitative evaluation conclusion is formed as to whether the trenchless repair technology is feasible, and the evaluation conclusion is output.

9. A device for determining the feasibility and selecting trenchless repair technology for gas, characterized in that: include: An establishment module is used to establish a basic information database, wherein the basic information database includes: pressure level system, pipe material, pipe diameter, elbow angle and curvature radius; A determination module, used to determine basic parameters according to the environmental data of the pipeline to be repaired and in combination with the basic information database, wherein the basic parameters include: the pressure level of the pipeline to be repaired, the elbow angle of the pipeline to be repaired, the curvature radius of the pipeline to be repaired, the number of elbows of the pipeline to be repaired, the elbow interval of the pipeline to be repaired, the number of observation holes, the position of the observation holes and the size of the observation holes; A generation module, used to generate a trenchless repair experimental platform for urban gas pipelines according to the basic parameters, wherein the trenchless repair experimental platform for urban gas pipelines is used to simulate the pipeline to be repaired; A determination module, used to determine the feasibility of the pipeline to be repaired and the repair technology by using the urban gas pipeline trenchless repair experimental platform; The determination module uses the urban gas pipeline trenchless repair experimental platform to determine the feasibility of the pipeline to be repaired and the repair technology in the following manner: Determining the passability indicators of the pipeline to be repaired and the repair technology; Determine the roundness index of the pipeline to be repaired and the repair technology; The air tightness index of the pipeline to be repaired and the repair technology is determined.

10. The device according to claim 9, characterized in that Also includes: The evaluation module is used to form qualitative and quantitative evaluation conclusions on whether the trenchless repair technology is feasible, and output the evaluation conclusions.

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