CN114623391B - Positioning method for leakage position of gas pipeline - Google Patents
Positioning method for leakage position of gas pipeline Download PDFInfo
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- CN114623391B CN114623391B CN202210372033.3A CN202210372033A CN114623391B CN 114623391 B CN114623391 B CN 114623391B CN 202210372033 A CN202210372033 A CN 202210372033A CN 114623391 B CN114623391 B CN 114623391B
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000001514 detection method Methods 0.000 claims abstract description 156
- 238000005086 pumping Methods 0.000 claims abstract description 29
- 230000000630 rising effect Effects 0.000 claims abstract description 19
- 239000007789 gas Substances 0.000 abstract description 154
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 24
- 238000009412 basement excavation Methods 0.000 abstract description 20
- 238000004080 punching Methods 0.000 abstract description 12
- 239000002689 soil Substances 0.000 abstract description 12
- 239000002737 fuel gas Substances 0.000 abstract description 6
- 238000011161 development Methods 0.000 abstract description 3
- 238000009792 diffusion process Methods 0.000 description 15
- 238000000605 extraction Methods 0.000 description 6
- 230000000903 blocking effect Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000001174 ascending effect Effects 0.000 description 2
- 238000009933 burial Methods 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/02—Preventing, monitoring, or locating loss
Abstract
The invention relates to the technical field of pipeline detection and discloses a positioning method of a gas pipeline leakage position, which comprises the following steps that firstly, the position of the gas pipeline is determined by taking a ground leakage point as a center; digging at least two detection holes above the gas pipeline; step three, adopting a vacuum pump to respectively pump air from each detection hole, closing the vacuum pump after the first period of air pumping, and recording the gas concentration of each detection hole when and after the vacuum pump is pumped and closed in real time; and step four, comparing the gas concentration falling speed and the gas concentration rising speed of each detection hole to determine the leakage position. The direction of excavation of the subsequent detection holes is guided according to the change of the concentration speed of the fuel gas, so that the times of punching can be reduced, and the strength of workers is reduced; the leakage of the gas pipeline is subjected to the gradual development process from the initial stage again, and the gradient change and time difference of methane in the soil are increased, so that an operator can more accurately judge the relative position of the punching point from the real leakage point.
Description
Technical Field
The invention relates to the technical field of pipeline detection, in particular to a positioning method for a leakage position of a gas pipeline.
Background
The gas pipeline is an important part of municipal construction of cities, and with the development of cities, the area covered by the pipe network is larger and larger, and the complex external environment and time function enable the corrosion risk of the pipe network to be larger and larger.
When pipe corrosion causes gas leakage, such leakage is typically of unknown location, and the leakage rate is typically small, but the possibility of accumulation of leakage or increased pipe damage over time is not precluded. Because the pipe network is generally buried underground by 1 meter, emergency personnel cannot intuitively judge the specific leakage position and repair the leakage position when the pipeline corrodes and leaks, the continuous excavation, the gas leakage concentration detection and the personal experience are usually carried out for judgment, and finally the leakage position is determined and repaired.
However, when the leakage position is judged by adopting continuous excavation, gas concentration detection and personal experience, the actual leakage position is difficult to judge when the methane concentration in the leakage area is more high, and multiple excavation verification is needed to find the actual leakage position, so that the excavation area is large; meanwhile, the operation of cities depends on the cooperation operation of various systems, temporary blocking risks exist in roads, traffic and the like, and the reaction can be further aggravated when the road surface is excavated in a large area; in addition, in order to avoid the influence on society, first-line emergency personnel usually control the scene in advance under the condition of controllable leakage, wait for the road condition to be better, carry out the operation when the people flow less, in other words, generally carry out the work at rest time such as evening of normal work crowd. When excavation is carried out for many times, each invalid excavation can cause delay of the whole rescue repair time, the working strength of first-line personnel is increased, and carbon emission for the environment is increased.
Disclosure of Invention
The purpose of the invention is that: the positioning method for the leakage position of the gas pipeline is provided, so that the problems that in the prior art, an maintainer excavates a road surface for many times and detects the concentration to determine the leakage position of the gas, the excavation area is large, the number of times is large, the normal operation of society is affected, and the working intensity of first-line staff is high are solved.
In order to achieve the above purpose, the invention provides a positioning method for a leakage position of a gas pipeline, comprising the following steps of firstly, taking a ground leakage point as a center, and determining the position of the gas pipeline around the ground leakage point; step two, two detection holes are formed above the gas pipeline in the step one by taking a ground leakage point as a center, and the detection holes are arranged at intervals along the extending position of the gas pipeline; step three, connecting each detection hole in the step two with a vacuum pump respectively, adopting the vacuum pump to pump air from each detection hole respectively, closing the vacuum pump after the first period of air pumping or operating the vacuum pump with low power lower than that of the air pumping, and recording the gas concentration of each detection hole when the vacuum pump pumps air and after the vacuum pump is closed in real time; and step four, comparing the gas concentration falling speed of each detection hole when the vacuum pump is pumping, and the gas concentration rising speed when the vacuum pump is closed or in low-power operation, determining the detection hole with the slowest gas concentration falling speed and the fastest rising speed, and repeating the steps two to four by taking the detection hole obtained in the step four as the center until the detection hole with the slowest gas concentration falling speed when the vacuum pump is pumping and the fastest gas concentration rising speed after the vacuum pump is closed in all the detection holes is obtained, wherein the real leakage point is around the detection hole.
Preferably, one of the two detection holes is defined as a first detection hole, and the other is defined as a second detection hole, wherein when no third-party pipeline exists around the gas pipeline, the first detection hole is the intersection point between the ground leakage point and the vertical line of the gas pipeline and the gas pipeline; when a third-party pipeline exists around the ground leakage point, the first detection hole is the intersection point of the gas pipeline and the third-party pipeline.
Preferably, two second detection holes are arranged on two sides of the first detection hole along the extending direction of the gas pipeline.
Preferably, the hole depth of each detection hole is smaller than or equal to the burial depth of the gas pipeline.
Preferably, in the second step, the intervals of the respective detection holes are the same.
Preferably, the interval between the respective detection holes is 0.5-5m.
Preferably, in the fourth step, a graph between the gas concentration and time in each detection hole is drawn, and the gas concentration falling speed and the gas concentration rising speed are determined according to the graph.
Preferably, in the third step, the condition for turning off the vacuum pump is: the gas concentration of each detection hole tends to zero, or the gas concentration of each detection hole tends to be stable, or the vacuum pump exceeds the set pumping time.
Preferably, in the third step, when some of the detection holes are pumped, other detection holes are temporarily blocked.
Compared with the prior art, the positioning method for the leakage position of the gas pipeline has the beneficial effects that: digging two detection holes in the extending direction of the gas pipeline, wherein the closer to the real leakage point, the slower the gas concentration in the detection holes decreases when the vacuum pump is pumping, and the faster the gas concentration in the detection holes increases when the vacuum pump is closing or in low-power operation, so that the digging direction of the subsequent detection holes is guided, an operator simultaneously records the gas concentration change trend in a plurality of detection holes, the times of punching can be reduced, the digging area is reduced, and the strength of workers is reduced; in addition, the gas concentration in the soil is reduced by utilizing the vacuum pump to pump gas, so that the leakage of the gas pipeline is subjected to the process of gradually developing from the initial stage, and the gradient change of methane in the soil and the time difference are increased, thereby being convenient for operators to judge the relative position of the punching point from the real leakage point more accurately.
Drawings
FIG. 1 is a schematic diagram of a vacuum pump suction of a method of locating a leak location of a gas conduit of the present invention;
FIG. 2 is a schematic illustration of the determination of a first detection hole without a third party line in the method for locating a leak location in a gas pipeline according to the present invention;
FIG. 3 is a schematic illustration of the determination of a first detection hole when a third party pipeline is crossed in the method for locating a gas pipeline leakage position according to the present invention;
FIG. 4 is a schematic view of the range of natural gas leakage in soil in the method for locating the leakage position of a gas pipeline according to the present invention;
FIG. 5 is a schematic illustration of the excavation of each of the test holes in the method for locating the leak location of a gas pipeline of the present invention;
FIG. 6 is a schematic view of gas leakage when the vacuum pump is pumping in the method for locating the leakage position of the gas pipeline according to the invention;
FIG. 7 is a schematic view of gas leakage after the vacuum pump is turned off in the method for locating the gas pipe leakage position according to the present invention;
FIG. 8 is a schematic view showing the decrease in gas concentration during pumping of the vacuum pump at the detection holes of D, E and F in the method for locating the leakage position of the gas pipeline according to the present invention;
fig. 9 is a schematic diagram showing the gas concentration rise when the vacuum pump is turned off at the D, E and F points in the gas pipe leakage position locating method of the present invention.
In the figure, 1, a gas pipeline; 2. ground leakage points; 3. a first detection hole; 4. a third party pipeline; 5. a vacuum pump; 6. a flexible conduit; 7. and (5) a real leakage point.
Detailed Description
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
A preferred embodiment of a method for locating a leakage position of a gas pipe according to the present invention, as shown in fig. 1 to 9, includes the steps of:
step one, the position of the gas pipeline 1 around the ground leakage point 2 is determined by taking the ground leakage point 2 as the center.
In general, under hard road surfaces, due to the difference in diffusivity, the fuel gas is continuously diffused under the hard road surfaces to form a group of high concentration areas, and meanwhile, the higher methane concentration is not detected on the road surfaces above the leakage points. The diffusion of methane can leak out in the space of a valve well, a sewer, a road crack and the like, and can be found by personnel at the moment, so that the apparent ground leakage point 2 is not necessarily a real leakage point, and the positions of the gas pipelines 1 are required to be determined around the ground leakage point 2 and the leakage positions are required to be positioned.
The ground leakage point 2 is usually located around the actual leakage point of the gas pipeline 1, and the position of the gas pipeline 1 is determined by taking the ground leakage point 2 as the center, so that the workload can be reduced. In addition, the position of the gas pipeline 1 is determined, and the position of other third-party pipelines around the ground leakage point 2 can be determined, so that the excavation position of the detection hole can be determined.
And step two, searching and opening two detection holes above the gas pipeline 1 in the step one by taking the ground leakage point 2 as the center, wherein the detection holes are arranged at intervals along the extending position of the gas pipeline 1.
When two detection holes are excavated, the vacuum pump 5 can be used for pumping air and comparing the gas concentration change rate of each detection hole, so that the position direction of the real leakage point 7 relative to the two detection holes is determined, the excavation position of the subsequent detection holes is guided, the times of punching can be reduced, the excavation area is reduced, the strength of workers is reduced, and the excavation direction can be determined according to the gas concentration change rate in the first two detection holes at the position of the subsequent detection holes.
And thirdly, connecting each detection hole with the vacuum pump 5, adopting the vacuum pump 5 to pump air to each detection hole, closing the vacuum pump 5 after the first period of air pumping or operating the vacuum pump 5 with low power lower than that of the air pumping, and recording the gas concentration of each detection hole when the vacuum pump 5 is pumped and after the vacuum pump 5 is closed or in low power operation in real time.
When the gas concentration change in the detection holes is measured, each detection hole is connected with a vacuum pump 5 through a flexible pipeline 6, the vacuum pump 5 adopts an explosion-proof vacuum pump 5, and meanwhile, a gas concentration detector with a wireless transmission function is connected at the joint of the flexible pipeline 6; in this embodiment, the object of detection by the gas concentration detector is methane, and the gas concentration is represented by detecting the concentration of methane.
After the vacuum pump 5 is turned off, the gas concentration of each detection hole is continuously recorded for a certain time, so that the change condition of the gas concentration in the detection hole along with the time is completely recorded. Before air extraction, the methane concentration at each point below the soil is high due to the long-time diffusion effect and the blocking effect of the hard pavement, so that the real leakage condition is difficult to judge. Therefore, the gas concentration in the soil is reduced by the vacuum pump 5, so that the leakage of the gas pipeline 1 is subjected to the gradual development process from the initial stage again, and the methane gradient change and the time difference in the soil are increased, thereby being convenient for operators to judge the relative position of the punching point from the real leakage point 7 more accurately.
If the vacuum pump 5 is completely shut down, the speed of the combustible gas diffusing from the detection hole to the position of the gas detection device may be slow when the ground air extraction end adopts the automatic methane concentration detection equipment; if the vacuum pump 5 is kept running at a low power, this is equivalent to a sampling process (e.g. a pump is sucked in when a manual hand-held detector detects it, so that the efficiency of sampling the detection hole is improved.
And step four, comparing the gas concentration descending speed of each detection hole when the vacuum pump 5 is pumping with the gas concentration ascending speed after the vacuum pump 5 is closed, and determining the detection hole with the slowest gas concentration descending speed and the fastest ascending speed.
The closer the distance from the real leakage point 7 is, the slower the falling speed of the gas concentration when the vacuum pump 5 pumps the detection holes is, and the faster the rising speed of the gas concentration after the vacuum pump 5 is closed, so that the distance between the detection holes and the real leakage point 7 can be judged according to the gas concentration falling record and the rising record recorded in the third step, so that the digging direction of the subsequent detection holes is guided, an operator can record the gas concentration change trend in a plurality of detection holes at the same time, the punching times can be reduced, the digging area can be reduced, and the strength of workers can be reduced.
And fifthly, repeating the second to fourth steps by taking the detection hole obtained in the fourth step as the center until the detection holes with the slowest gas concentration falling speed and the fastest gas concentration rising speed after the vacuum pump 5 is closed in the vacuum pumps 5 in all the detection holes are obtained, wherein the real leakage points 7 are around the detection holes.
When the gas is pumped, the gas concentration of the gas tends to zero under the following three conditions that 1, the pumping speed is larger than the gas diffusion speed; 2. the air extraction rate is equal to the gas diffusion rate, and the gas concentration is all stable; 3. the air extraction rate is smaller than the diffusion speed, and the concentration of the fuel gas is unchanged. According to research and practice, the diffusion rate of the fuel gas is influenced by two factors, namely convection caused by pressure difference and diffusion caused by concentration difference, and the diffusion caused by concentration difference is mainly caused at a position far from the leakage point.
Only in the vicinity above the leak point, it is possible that the pumping rate is less than the diffusion rate, so that when the pumping rate is less than the diffusion rate, the leak position of the gas pipe 1 can be directly obtained, and the position is also the position in all the detection holes that is closest in space to the real leak point 7. The detection hole is used as the center for digging, so that the leakage position can be accurately found, the punching times can be reduced, the digging area is reduced, and the strength of workers is reduced.
Defining the positions of the detection holes as a point A, a point B, a point C, a point D, a point E and a point F respectively, and pumping three detection holes of the point D, the point E and the point F as shown in fig. 8 and 9, wherein in a descending interval, namely, when the vacuum pump 5 pumps air, the concentration of D ignition gas is slow to descend, the time for reaching stable gas concentration is long, the concentration of F ignition gas is fast to descend, and the time for reaching stable gas concentration is short; meanwhile, in the gas concentration rising interval, namely after the vacuum pump 5 is turned off, the rising speed of the D ignition gas concentration is high, the time for reaching the same gas concentration is short, the final gas concentration is high, the rising speed of the F ignition gas concentration is slow, the time for reaching the same gas concentration is long, and the final gas concentration is lower; and the comparison of the rising and falling sections of the gas concentration is integrated, so that the D point can be judged to be closer to the real leakage point.
From the above, it is known that the verification should be performed by punching holes (points a, B, and C) on the left side of point D at this time, and further, the true leakage point should be determined and confirmed. As shown in fig. 1, 5, 6 and 7, the above flow is repeated to display that the point C among the points a, B and C is closer to the leakage point, so that the leakage point can be confirmed to be near the CD segment, thereby accurately judging the leakage position and guiding the excavation rescue work.
Preferably, in the second step, one of the two detection holes is defined as a first detection hole 3, and the other is defined as a second detection hole, and when the third party pipeline 4 is not arranged around the gas pipeline 1, the first detection hole 3 is the intersection point between the ground leakage point 2 and the vertical line of the gas pipeline 1 and the gas pipeline 1; when the third party pipeline 4 exists around the gas pipeline 1, the first detection hole 3 is the intersection point of the gas pipeline 1 and the third party pipeline 4.
When there is no third party line 4 around the gas pipe 1, the spontaneous combustion of the gas in the soil can be approximately considered to be diffused, so that the first detection hole 3 is excavated on the gas pipe 1 nearest to the ground leakage point 2. When a plurality of gas pipelines 1 exist around the ground leakage point 2, the first detection holes 3 are sequentially selected according to the distance between the ground leakage point 2 and each gas pipeline 1.
When other lines, such as telecommunication lines, cable lines, etc., are present at the leak location, the speed of the leaking gas diffusion in the casing is much greater than the speed of the leaking gas diffusion in the compacted soil, and therefore the crossover location should be selected as the first detection hole 3, because the telecommunication, cable, etc. lines are provided with a casing underground, and the casing is generally left empty.
The ground leak 2 may be located in a catch basin, a telecommunication well or the like, in which case it is first determined whether the third party line 4 runs to intersect the gas pipeline 1. Because of the possible presence of the casing in the third-party line 4, the efficiency of diffusion of the fuel gas through the space inside the third-party line 4 is greater than the natural diffusion efficiency in the soil.
Preferably, there are two second detection holes, which are arranged on both sides of the first detection hole 3 in the extending direction of the gas pipe 1.
The second detection holes are excavated at the two sides of the first detection hole 3, and the direction of the real leakage point 7 relative to the first detection hole 3 can be judged through the concentration change curves of the two detection holes, so that the excavation direction of the subsequent detection holes is guided, and the workload is reduced.
Preferably, the hole depth of each detection hole is equal to or less than the burial depth of the gas pipeline 1.
Under normal conditions, the gas can diffuse to the ground, the lowest point of the detection hole is located below the gas pipeline 1 due to the fact that the hole depth is too large, the gas pipeline 1 can be damaged at the moment, the concentration of the gas at the bottom of the detection hole is low due to too deep excavation, and the authenticity of the detection result is affected.
Preferably, in the second step, the intervals of the respective detection holes are the same.
Each detection hole is excavated at the same interval, so that the excavation position of each detection hole can be conveniently determined, and the efficiency is improved; meanwhile, the diffusion of the gas concentration in the ground suddenly is regular, so that the distance between the gas concentration and the real leakage point 7 can be estimated and judged according to the gas concentration change speed of the detection hole.
Preferably, the interval between the detection holes is 0.5-5m, and the value of L is 0.5-5m as shown in FIG. 1.
The excavation diameter is about 0.5-5m when gas is leaked, the intervals of the detection holes are matched with the excavation diameter, the concentration gradient and the concentration value difference are easy to react, the excavation is conveniently carried out by taking the detection hole as the center after the detection hole closest to the leakage point is determined, and the efficiency is improved.
Preferably, in the fourth step, a graph between the gas concentration and time in each detection hole is drawn, and the gas concentration falling speed and the gas concentration rising speed are determined according to the graph.
As shown in fig. 8 and 9, the horizontal axis represents time and the vertical axis represents gas concentration. The graph can intuitively reflect the gas concentration change condition in the detection holes, so that an maintainer can judge the falling speed of the gas concentration of each detection hole when the vacuum pump 5 is in air suction and the rising speed of the gas concentration after the vacuum pump 5 is closed. In addition, when the concentration is detected by adopting the gas concentration detector, a graph can be directly drawn through peripheral computing equipment, so that automatic operation is realized, and the overhaul efficiency is improved.
Preferably, in the third step, the condition for turning off the vacuum pump 5 is: the gas concentration of each detection hole tends to zero, or the gas concentration of each detection hole tends to be stable, or the vacuum pump 5 exceeds the set pumping time.
The distances between the different detection holes and the real leakage point 7 are different, so that the difference between the leakage rate of the fuel gas in the detection holes and the pumping rate of the vacuum pump 5 is different. When the leakage rate in the detection hole is smaller than the pumping rate of the vacuum pump 5, the gas concentration in the detection hole finally tends to zero; when the leakage rate in the detection holes is close to the air extraction rate of the vacuum pump 5, the gas concentration of each detection hole tends to be stable; when the leakage rate in the detection hole is larger than the pumping rate of the vacuum pump 5, the gas concentration in the detection hole is less changed, and the vacuum pump 5 can be turned off after pumping exceeds the set time.
The timing of closing the vacuum pump 5 is selected according to different air extraction conditions, so that the maintenance efficiency can be improved.
Preferably, in the third step, when some of the detection holes are pumped, other detection holes are temporarily blocked.
After blocking other detection holes, gas leakage from other detection holes can be avoided, so that gas leakage in the detection holes to be pumped is subjected to the process of gradually developing from the initial stage, the actual condition of gas leakage is more fitted, and the relative position of the punching point from the real leakage point 7 is more accurately judged.
In summary, the embodiment of the invention provides a positioning method for a leakage position of a gas pipeline, which comprises the steps of excavating at least two detection holes in the extending direction of the gas pipeline, wherein the closer to a real leakage point, the slower the gas concentration in the detection holes decreases when a vacuum pump is used for pumping, the faster the gas concentration in the detection holes rises after the detection holes are closed or during low-power operation, so that the excavating direction of the subsequent detection holes is guided, an operator simultaneously records the gas concentration change trend in a plurality of detection holes, the times of punching can be reduced, the excavating area is reduced, and the strength of workers is reduced; in addition, the gas concentration in the soil is reduced by utilizing the vacuum pump to pump gas, so that the leakage of the gas pipeline is subjected to the process of gradually developing from the initial stage, and the gradient change of methane in the soil and the time difference are increased, thereby being convenient for operators to judge the relative position of the punching point from the real leakage point more accurately.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present invention, and these modifications and substitutions should also be considered as being within the scope of the present invention.
Claims (7)
1. The method for positioning the leakage position of the gas pipeline is characterized by comprising the following steps of firstly, taking a ground leakage point as a center, and determining the position of the gas pipeline around the ground leakage point; step two, two detection holes are formed above the gas pipeline in the step one by taking a ground leakage point as a center, and the detection holes are arranged at intervals along the extending position of the gas pipeline; step three, connecting each detection hole in the step two with a vacuum pump respectively, adopting the vacuum pump to pump air from each detection hole respectively, closing the vacuum pump after the first period of air pumping or operating the vacuum pump with low power lower than that of the air pumping, and recording the gas concentration of each detection hole when the vacuum pump pumps air and after the vacuum pump is closed in real time; step four, comparing the gas concentration falling speed of each detection hole when the vacuum pump is pumping, the gas concentration rising speed when the vacuum pump is closing or low power operation, determining the detection hole with the slowest gas concentration falling speed and the fastest rising speed, step five, taking the detection hole obtained in the step four as the center, repeating the steps two to four until the detection hole with the slowest gas concentration falling speed when the vacuum pump is pumping and the fastest gas concentration rising speed after the vacuum pump is closing in all the detection holes is obtained, truly leaking points are around the detection hole with the slowest gas concentration falling speed when the vacuum pump is pumping and the fastest gas concentration rising speed after the vacuum pump is closing,
defining one of the two detection holes as a first detection hole and the other as a second detection hole, wherein when no third-party pipeline exists around the gas pipeline, the first detection hole is the intersection point between the ground leakage point and the vertical line of the gas pipeline and the gas pipeline; when the third party pipeline is crossed around the ground leakage point, the first detection hole is the intersection point of the gas pipeline and the third party pipeline,
the two second detection holes are arranged on two sides of the first detection hole along the extending direction of the gas pipeline.
2. The method for locating a leakage position of a gas pipe according to claim 1, wherein a hole depth of each of the detection holes is equal to or less than a buried depth of the gas pipe.
3. The method for locating a leakage position of a gas pipeline according to claim 1 or 2, wherein in the second step, intervals of the respective detection holes are the same.
4. A method of locating a leak location in a gas conduit according to claim 3, wherein the individual detection holes are spaced apart by 0.5-5m.
5. The method for locating a leakage position of a gas pipe according to claim 1 or 2, wherein in the fourth step, a graph between the gas concentration in each detection hole and time is drawn, and a gas concentration falling speed and a gas concentration rising speed are determined from the graph.
6. The method for locating a leakage position of a gas pipeline according to claim 1 or 2, wherein in the third step, the condition for turning off the vacuum pump is: the gas concentration of each detection hole tends to zero, or the gas concentration of each detection hole tends to be stable, or the vacuum pump exceeds the set pumping time.
7. The method for locating a leakage position of a gas pipeline according to claim 1 or 2, wherein in the third step, when the partial detection holes are pumped, the other detection holes are temporarily blocked.
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