CN107289332B - The method that infrared thermal imagery couples soil temperature and humidity detection buried thermo-pipeline exception - Google Patents
The method that infrared thermal imagery couples soil temperature and humidity detection buried thermo-pipeline exception Download PDFInfo
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- CN107289332B CN107289332B CN201710333351.8A CN201710333351A CN107289332B CN 107289332 B CN107289332 B CN 107289332B CN 201710333351 A CN201710333351 A CN 201710333351A CN 107289332 B CN107289332 B CN 107289332B
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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
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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
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Abstract
The present invention relates to a kind of methods of infrared thermal imagery coupling soil temperature and humidity detection buried thermo-pipeline exception.It is moved towards along buried pipe network, detects directly buried heat distribution pipeline road surface temperature, shoot four width Infrared Thermograms, according to temperature anomaly region area and temperature change, earth's surface temperature anomaly area is positioned.To there are the regions of insulating layer breakage or leakage failure, with soil temperature-moisture sensor measurement, the record soil moisture and volumetric water content.Show bigger temperature gradient in vertical direction, and when the volumetric water content of the normal/abnormal region underlying soil of surface temperature is consistent with the trend of change in depth but abnormal area soil moisture content is slightly above normal region, judgement is that buried pipe network insulating layer is damaged；Above-mentioned two region underground temperature and volumetric water content are in significant difference with the variation of depth, then the surface temperature abnormal phenomenon is buried pipe network leakage.Heat distribution pipeline leakage point, insulating layer breaking point position can be accurately positioned in the present invention, and guide maintenance personnel repairing reduces blindness excavated pavement, improves first-aid repair efficiency.
Description
Technical field
The present invention relates to a kind of methods of infrared thermal imagery coupling soil temperature and humidity detection buried thermo-pipeline exception, specially
Determine that using the method for Infrared Thermography Technology coupling soil temperature and humidity detection, directly buried heating pipeline system leakage or insulating layer are damaged
Method.Heat distribution pipeline leakage point or insulating layer breaking point position can be accurately positioned in the present invention, instruct pipeline maintenance personnel couple
This region is excavated, repairs work, is reduced loss brought by blindness excavated pavement, is improved first-aid repair efficiency.
Background technique
Invest that small, construction speed is fast, land occupation less and is easy to and other underground pipings and facility phase since directly buried installation has
The advantages that coordination, therefore, in city old town, the location that street is narrow, underground utilities are intensive, heating network mostly uses direct-burried to apply
If but directly buried installation can be created great difficulties to detection, the maintenance of heat distribution pipeline leakage point or insulating layer breaking point；If cannot
The leakage point or insulating layer breaking point of positioning heat distribution pipeline in time, can bring great energy waste and property loss.
After directly buried heat distribution pipeline road insulating layer is damaged, damaged part can be to strong heat dissipation around, so that heat occurs for surrounding soil
Moisture migration finally makes top earth's surface formation temperature exceptions area；After directly buried heat distribution pipeline road local leakage, hot water can be constantly to week
Soil infiltration is enclosed, until soil reaches saturated aqueous state, with the increase of leakage rate, hot water permeable areas can constantly expand,
So that top earth's surface also will form temperature anomaly area.It therefore, can be different by the surface temperature above analysis directly buried heat distribution pipeline road
Reason condition judges that it is damaged with the presence or absence of leakage or insulating layer.
Directly buried heating pipeline system detection generallys use manual inspection method, by directly observing and utilizing " putting warm rifle " detection heating power
The laying earth's surface surface appearance of pipe network positions the leakage point and insulating layer breaking point of heat distribution pipeline, and still, the method is only applicable in
In detecting that surface temperature abnormality degree is very big, insulating layer is damaged or the serious pipeline fault of abnormal leakage, it is difficult to realize to entire
The real-time detection of heat distribution pipe network failure.Zhao Kai describes a kind of heat distribution pipe network leakage in " heat supply network Research on fault diagnosis method "
Isolation detection method, the valve for closing portions isolates corresponding pipeline section from entire heat supply network, passes through observation rate of water make-up
And the situation of change of hydraulic pressure, determine whether isolated part pipeline section leaks；But whether this method can only determine isolation pipeline section
There are leakage failures, and leakage point can not but be accurately positioned.Dan Lijun describes one in " discussion of heat supply pipeline leakage detection method "
Kind heat distribution pipe network leaks sound and vibration detection method, i.e., when monitoring well interior conduit and pipe fitting leakage using equipment such as audition stick, leakage measuring instrument by sonic
The voice signal of generation, and then leakage is determined whether there is, then artificially judge the distance between leakage point and test point；But
It is that this method requires high, detection signal to interfere vulnerable to ambient noise the experience level of staff, and is difficult to accurately sentence
Where disconnected leakage point position.Li Huizeng " infrared thermal imaging technique be applied to heat distribution pipe network heat preservation with leak detection technique grind
Study carefully " a kind of detection method that surface temperature is shot along directly buried pipeline trend, using thermal infrared imager is proposed, pass through comparative analysis
It simultaneously include the Infrared Thermogram of surface temperature exceptions area and the normal area of temperature, to determine the leakage of directly buried heat distribution pipeline road or heat preservation
Layer is damaged, and this method can intuitively, fast position directly buried heating pipeline system abort situation, still, but be difficult to differentiate between
It is leaked on earth with differentiation heat distribution pipe network or insulating layer is damaged.
Summary of the invention
The object of the present invention is to provide a kind of sides of infrared thermal imagery coupling soil temperature and humidity detection buried thermo-pipeline exception
Heat distribution pipeline leakage point or insulating layer breaking point institute can be accurately positioned in method with overcome the deficiencies in the prior art, the present invention
In position, and it is capable of the fault type in accurate judgement directly buried heat distribution pipeline road, so that pipeline maintenance personnel be instructed to carry out this region
It is reasonable to excavate, repair work, the loss of blindness excavated pavement bring is reduced, first-aid repair efficiency is improved.
The method of infrared thermal imagery coupling soil temperature and humidity detection buried thermo-pipeline exception provided by the invention includes as follows
Step:
1) it is moved towards along buried pipe network, directly buried heat distribution pipeline road surface temperature is detected using hand-held thermal infrared imager, to earth's surface
Temperature anomaly area is positioned；
2) to oriented surface temperature Wen Changqu, (being advisable within time interval 5-24 hours) is shot at a certain time interval
At least four width Infrared Thermograms, by analyzing the temperature anomaly region area and temperature value that compare in four width earth's surface Infrared Thermograms
Situation of change, judge heat distribution pipe network with the presence or absence of failure.Under similar weather conditions, if surface temperature abnormal area area
It remains unchanged or persistently increases, maximum temperature value remains unchanged or constantly improve, then determines that there are insulating layers for underground pipe network at this
Damaged or leakage failure；Otherwise, then it will be used as emphasis monitoring object at this, is periodically detected.
3) for having determined that the region there are insulating layer breakage or leakage failure, in temperature anomaly region and adjacent temperature
Suitable position at normal region each selected one, takes soil using geotome vertical drilling.When hole depth is 100mm, stops and take out
Geotome out after soil temperature-moisture sensor indicating value is stablized, is recorded in the soil of soil temperature-moisture sensor insertion bottom hole
The soil moisture and volumetric water content extract Temperature Humidity Sensor out；Then, repetition is above-mentioned takes soil and Temperature and Humidity step, respectively
In 200mm, 300mm, 400mm, 500mm, 600mm or even the deeper position detection soil moisture and volumetric water content, hole depth is most
Vertical range between big value and buried pipeline upper surface is advisable with 200mm.
4) in buried pipe network top surface temperature normal region, with the increase of Temperature and Humidity point depth, the soil moisture
The trend being gradually increased is presented with volumetric water content.If the soil moisture under surface temperature abnormal area is showed in vertical direction
Bigger temperature gradient out, and the volumetric water content of the normal/abnormal region underlying soil of surface temperature is with the trend of change in depth
When unanimously but abnormal area soil moisture content is slightly above normal region, it can determine that the surface temperature abnormal phenomenon is buried pipe network
Caused by insulating layer is damaged.If above-mentioned two region underground temperature and volumetric water content present significant with the changing rule of depth
Difference then can determine that the surface temperature abnormal phenomenon is caused by buried pipe network leakage.
Suitable for -40 DEG C of thermal infrared imager test temperature ~ 120 DEG C of the present invention, soil temperature-moisture sensor temperature measures model
Enclose -40 DEG C ~ 120 DEG C, volumetric water content measurement range 0% ~ 100%(or m3/m3).
The present invention provides the methods of infrared thermal imagery coupling soil temperature and humidity detection buried thermo-pipeline exception.By infrared
Thermal imaging system can intuitively, quickly and correctly position the temperature anomaly area of earth's surface above directly buried heat distribution pipeline road；For having determined
The pipeline section leaked, temperature anomaly area that thermal imaging system is measured it is determined that be the position of heat distribution pipeline leakage point, thus
It instructs pipeline maintenance personnel to carry out excavating repairing work to this region, reduces the loss of blindness excavated pavement bring, improve repairing
Efficiency；The temperature of soil and volumetric water content at this are measured with the changing condition of depth of soil by soil temperature and humidity instrument, thus
Determine pipeline unusual condition, heat distribution pipeline leakage need to carry out excavating repairing work as early as possible, and heat pipeline heat insulation layer breakage can be with
Carry out maintenance work in non-heating period.In short, guilty culprit position and the event of buried thermo-pipeline can be accurately positioned in the present invention
Hinder type, the testing cost, raising fault diagnosis rate, the energy of reduction heating network for facilitating reduction heat distribution pipe network unusual condition are former
Waste.
Detailed description of the invention
Fig. 1 is Infrared Thermogram of the high mausoleum section surface temperature exceptions area of 1 heat distribution pipe network of embodiment in different moments.
Fig. 2 is the high fixed line segment L1 Temperature Distribution of mausoleum section surface temperature exceptions area infrared image of 1 heat distribution pipe network of embodiment.
Fig. 3 is the high fixed line segment L2 Temperature Distribution of mausoleum section surface temperature exceptions area infrared image of 1 heat distribution pipe network of embodiment.
Fig. 4 is the high mausoleum section surface temperature exceptions area of 1 heat distribution pipe network of embodiment and the normal area's soil moisture of temperature with depth
Variation.
Fig. 5 be 1 heat distribution pipe network of embodiment high mausoleum section surface temperature exceptions area and the normal area's volumetric soil water content of temperature with
The variation of depth.
Fig. 6 is that (insulating layer is broken for the excavation result of 1 heat distribution pipe network of embodiment high mausoleum section surface temperature exceptions area position
Damage).
Fig. 7 is Infrared Thermogram of the young section surface temperature exceptions area of 2 heat distribution pipe network of embodiment one in different moments.
Fig. 8 is 2 heat distribution pipe network of embodiment, the one fixed line segment L1 Temperature Distribution of children section surface temperature exceptions area infrared image.
Fig. 9 is 2 heat distribution pipe network of embodiment, the one fixed line segment L2 Temperature Distribution of children section surface temperature exceptions area infrared image.
The young section surface temperature exceptions area of 2 heat distribution pipe network of Figure 10 embodiment one and the normal area's soil moisture of temperature with depth change
Change.
The young section surface temperature exceptions area of 2 heat distribution pipe network of Figure 11 embodiment one and the normal area's volumetric soil water content of temperature are with depth
The variation of degree.
The excavation result (pipe leakage) of the young section surface temperature exceptions area position of 2 heat distribution pipe network of Figure 12 embodiment one.
Specific embodiment
A kind of method for infrared thermal imagery coupling soil temperature and humidity detection buried thermo-pipeline exception that the present invention designs, mainly
Hardware includes thermal infrared imager, computer and soil temperature-moisture sensor, and above equipment is commercial product.Suitable for the present invention
- 40 DEG C of thermal infrared imager temperature measurement range ~ 120 DEG C, -40 DEG C of soil temperature-moisture sensor temperature measurement range ~ 120 DEG C, body
Product 0% ~ 100%(of measurement of water ratio range or m3/m3).
Specific embodiment is as follows:
1, during heating in winter, select sunny and wind speed lower night or there is no direct sunlight and wind speed it is lesser
It is moved towards along buried pipe network daytime, hand-held thermal infrared imager scans for formula detection, searches, positioning earth's surface temperature anomaly region.
2, to oriented surface temperature Wen Changqu, (being advisable within time interval 5-24 hours) is shot at a certain time interval
At least four width Infrared Thermograms carry software using thermal infrared imager and analyze the temperature anomaly area compared in earth's surface Infrared Thermogram
The situation of change of domain area and temperature value judges heat distribution pipe network with the presence or absence of failure.Under similar weather conditions, if earth's surface temperature
Degree abnormal area area remains unchanged or persistently increases, and maximum temperature value remains unchanged or constantly improve, then determines underground at this
There are insulating layer breakage or leakage failures for pipe network；Otherwise, then it will be used as emphasis monitoring object at this, is periodically detected.
3, for having determined that the region there are insulating layer breakage or leakage failure, in temperature anomaly region and adjacent temperature
Suitable position at normal region each selected one, takes soil using geotome vertical drilling.When hole depth is 100mm, stops and take out
Geotome out after soil temperature-moisture sensor indicating value is stablized, is recorded in the soil of soil temperature-moisture sensor insertion bottom hole
The soil moisture and volumetric water content extract Temperature Humidity Sensor out；Then, repetition is above-mentioned takes soil and Temperature and Humidity step, respectively
In 200mm, 300mm, 400mm, 500mm, 600mm or even the deeper position detection soil moisture and volumetric water content, hole depth is most
Vertical range between big value and buried pipeline upper surface is advisable with 200mm.
4, in buried pipe network top surface temperature normal region, with the increase of Temperature and Humidity point depth, the soil moisture
The trend being gradually increased is presented with volumetric water content.If the soil moisture under surface temperature abnormal area is showed in vertical direction
Bigger temperature gradient out, and the volumetric water content of the normal/abnormal region underlying soil of surface temperature is with the trend of change in depth
When unanimously but abnormal area soil moisture content is slightly above normal region, it can determine that the surface temperature abnormal phenomenon is buried pipe network
Caused by insulating layer is damaged.If above-mentioned two region underground temperature and volumetric water content present significant with the changing rule of depth
Difference then can determine that the surface temperature abnormal phenomenon is caused by buried pipe network leakage.
Test method without specific conditions in embodiment, usually according to normal condition and item described in handbook
Part, or according to the normal condition proposed by manufacturer；Common apparatus, material used etc. unless otherwise specified can be from business ways
Diameter obtains.
Application Example
In embodiment, the model FLIR Therma CAMTM S65(FLIR Systems of used thermal infrared imager
Company)；The infrared thermal image technique software installed on the computer is FLIR Therma CAM Researcher Pro 2.7
(FLIR Systems company).Soil temperature and relative humidity model OSA-9, OSA-1, display instrument model OSC-1
(Hebei Ou Su Electronic Science and Technology Co., Ltd.).
Embodiment 1: pipe insulating layer damage testing method and testing result
High mausoleum drought river pipeline section was once netted for Chengde heat supply and carries out infrared thermal imagery coupling Soil Temperature And Moisture on January 1st, 2017
Degree detection, pipe diameter 1000mm, buried depth 1.5m, 110 DEG C of supply water temperature at this, soil is organoclay.Infrared thermal imagery camera lens away from
From earth's surface 3m, other parameters setting is shown in Table 1.
1 infrared heat image instrument measuring parameter setting of table
| Detection time | Atmospheric temperature | Environment temperature | Relative air humidity | Emissivity | Temperature range |
| January 1 10:49 | -3℃ | -2℃ | 47% | 0.95 | -40℃~120℃ |
| January 2 09:52 | -7℃ | -6℃ | 57% | 0.95 | -40℃~120℃ |
| January 2 16:49 | 0℃ | 1℃ | 50% | 0.95 | -40℃~120℃ |
| January 3 07:46 | -8℃ | -7℃ | 59% | 0.95 | -40℃~120℃ |
Surface temperature exists abnormal above the high mausoleum segment pipe of Chengde heat distribution pipe network, hence it is evident that higher than the earth's surface temperature of adjacent area
Degree；4 moment Infrared Thermogram as shown in Figure 1, surface temperature abnormal area is rounded, area is about 1.5m2, with
Significant change does not occur for the passage of time, temperature anomaly region area.It is to run through in thermography in fixing line L1, L2(L1, L2
The vertical line and x wire of heart high-temperature region) on, surface temperature is in normal distribution form；Over time, the ground on L1, L2
Table profiling temperatures do not occur significantly to change, as shown in Figure 2 and Figure 3.According to the above phenomenon, underground pipe at this is tentatively inferred
There are insulating layer breakage or abnormal leakages for net, therefore, it is necessary to carry out Temperature and Humidity to underground at this, to further determine
Fault type.
The suitable position at temperature anomaly region and adjacent temperature normal region each selected one, it is vertical using geotome
Boring extracting soil, and using soil temperature-moisture sensor measurement different depth soil temperature and volumetric water content, the soil moisture and
Volumetric water content is as shown in Figure 4, Figure 5 with the changing rule of depth (0 ~ 600mm).In surface temperature normal region, with depth
Increase, soil moisture curve is presented the trend that slowly increases, reaches 21.9 DEG C in the depths 600mm；In surface temperature exceptions area
Domain, soil moisture curve is significant with the variation abnormality of depth, there is bigger temperature gradient, has reached 71.3 in the depths 600mm
DEG C, this illustrates heat distribution pipe network, and to surrounding soil, there are strong heat effects.But above-mentioned two regional soil volumetric water content
It is almost the same with the variation tendency of depth, and the soil moisture content in temperature anomaly region is slightly higher, this illustrates that there is no heating power at this
Soil moisture content greatly improves phenomenon caused by pipeline network leak, and the micro increase of volumetric soil water content is that the soil moisture improves
It is caused.
The above-mentioned testing result of comprehensive analysis determines that the surface temperature abnormal phenomenon is caused by buried pipe network insulating layer is damaged；
On March 20th, 2017, maintenance personal have organized to excavate and construct, and excavate result as shown in fig. 6, buried pipeline has occurred really at this
The insulating layer of large area is damaged.Prove effectiveness of the invention and correctness.
Embodiment 2: buried thermo-pipeline leakage detection method and testing result
Infrared thermal imagery coupling has been carried out for Chengde the first kindergarten of heating network branch net pipeline section on December 29th, 2016
Soil temperature and humidity detection, pipe diameter is 100mm, buried depth 1.2m at this, and water supplying pipe temperature is 110 DEG C；Its earth's surface is 100mm thick
Dutch brick, Dutch brick next coming in order are the cement sand bed and 200mm cement concrete layer with a thickness of 100mm, are further below
Sandy soil.Infrared thermal imagery distance of camera lens earth's surface 3m, other parameters setting are shown in Table 2.
2 infrared heat image instrument measuring parameter setting of table
| Detection time | Atmospheric temperature | Environment temperature | Relative air humidity | Emissivity | Temperature range |
| December 29 16:19 | -3℃ | -1℃ | 41% | 0.93 | -40℃~120℃ |
| December 30 09:22 | -11℃ | -10℃ | 44% | 0.93 | -40℃~120℃ |
| December 30 16:54 | -3℃ | -2℃ | 51% | 0.93 | -40℃~120℃ |
| December 31 08:34 | -7℃ | -6℃ | 43% | 0.93 | -40℃~120℃ |
Surface temperature exists abnormal above the young segment pipe of Chengde heat distribution pipe network one, hence it is evident that higher than the earth's surface temperature of adjacent area
Degree；4 moment Infrared Thermogram as shown in fig. 7, surface temperature abnormal area in ellipticity, central high temperature region present item
Band-like, over time, the trend being gradually increased is presented in surface temperature abnormal area area and central high temperature area area.
In fixing line L1, L2, the surface temperature distribution of synchronization is more uniform, but over time, surface temperature is whole
The trend being gradually increasing is showed, as shown in Figure 8, Figure 9.△ is long with night the reason of t=40h period bulk temperature is declined
Time consecutive low temperature is related.According to the above phenomenon, tentatively infer that buried pipe network is damaged there are insulating layer at this or leaks, therefore,
It needs to carry out Temperature and Humidity to underground at this, to further determine fault type.
The suitable position at temperature anomaly region and adjacent temperature normal region each selected one, it is vertical using geotome
Boring extracting soil, and utilize the temperature and volumetric water content of soil temperature-moisture sensor measurement different depth soil；Due to children's pipe
There are Dutch brick, screed and concrete layers that overall thickness is 400mm for section earth's surface, therefore, the soil moisture and volumetric water content institute
There is measuring point to be physically located under concrete layer.The soil moisture and volumetric water content with depth (400-1000mm) changing rule such as
Shown in Figure 10, Figure 11, in surface temperature normal region, the soil moisture increases the trend for presenting and being gradually increased with depth, but it increases
Width is smaller, and in the depths 1000mm, the soil moisture only has 5.5 DEG C；In surface temperature abnormal area, close to the shallow soil of concrete layer
Earth temperature is about 65 DEG C, but the soil moisture of other depth, all at 90 DEG C or more, this illustrates that the soil around pipe network is added
Heat.In surface temperature normal region, volumetric soil water content is with depth in slightly increase trend；But in surface temperature exceptions area
The trend dramatically increased is presented with depth for domain, soil moisture content, and the volumetric water content of deep soil has been approached saturated aqueous state,
This illustrates the hot water infiltration completely in the soil of heat distribution pipe network leakage.
In summary testing result determines that surface temperature abnormal phenomenon is caused by buried thermo-pipeline leakage at this.2016
On December 31, in, maintenance personal have organized to excavate and construct, and excavation result is as shown in figure 12, and pipeline is there are one directly through 3mm at this
The leak of left and right.Demonstrate effectiveness of the invention and correctness.
In 2016-2017 Heating Season, applicant is based on infrared thermal imagery proposed by the present invention coupling soil temperature and humidity detection
The method of buried thermo-pipeline exception, to the local 70 kilometers of long buried thermo-pipelines of Chengde Co., Ltd, heating power group
Search type diagnosis has been carried out, has found failure more than 50 altogether.Later period excavates the results show that infrared thermal imagery coupling soil temperature and humidity detection
The method of the breakage of buried thermo-pipeline insulating layer and leakage, with 100% accuracy, for the said firm saved a large amount of operation,
Detection and maintenance cost.
Claims (3)
1. a kind of method of infrared thermal imagery coupling soil temperature and humidity detection buried thermo-pipeline exception, it is characterised in that including as follows
Step:
1) it is moved towards along buried pipe network, directly buried heat distribution pipeline road surface temperature is detected using hand-held thermal infrared imager, to surface temperature
Exceptions area is positioned；
2) to oriented surface temperature exceptions area, at least four width Infrared Thermograms was shot with 5-24 hours time intervals, are passed through
The situation of change of temperature anomaly region area and temperature value in four width earth's surface Infrared Thermograms is compared in analysis, judges heat distribution pipe network
With the presence or absence of failure；Under similar weather conditions, if surface temperature abnormal area area remains unchanged or persistently increases, highest
Temperature value remains unchanged or constantly improve, then determine the surface temperature exceptions area underground pipe network there are insulating layer is damaged or leakage therefore
Barrier；Otherwise, then it is periodically detected using the surface temperature exceptions area as emphasis monitoring object；
3) normal in temperature anomaly region and adjacent temperature for having determined that the region there are insulating layer breakage or leakage failure
Suitable position at region each selected one, takes soil using geotome vertical drilling；When hole depth is 100mm, stop and extract out to take
Earth boring auger after soil temperature-moisture sensor indicating value is stablized, records soil in the soil of soil temperature-moisture sensor insertion bottom hole
Temperature and volumetric water content extract Temperature Humidity Sensor out；Then, repetition is above-mentioned takes soil and Temperature and Humidity step, exists respectively
200mm, 300mm, 400mm, 500mm, 600mm or even the deeper position detection soil moisture and volumetric water content；
4) in buried pipe network top surface temperature normal region, with the increase of Temperature and Humidity point depth, the soil moisture and body
The trend being gradually increased is presented in product moisture content；If the soil moisture under surface temperature abnormal area is shown more in vertical direction
Big temperature gradient, and the volumetric water content of the normal/abnormal region underlying soil of surface temperature with change in depth trend it is consistent,
But when abnormal area soil moisture content is slightly above normal region, it can determine that the surface temperature abnormal phenomenon is buried pipe network insulating layer
Caused by breakage；If the two region underground temperature in above-mentioned surface temperature normal region and surface temperature abnormal area and volume contain
Significant difference is presented with the changing rule of depth in water rate, then can determine that the surface temperature abnormal phenomenon is buried pipe network leakage institute
It causes；
The thermal infrared imager temperature-measuring range is -40 DEG C -120 DEG C.
2. according to the method described in claim 1, it is characterized in that soil temperature and humidity test point spacing described in step 3) is
100mm, the vertical range between hole depth maximum value and buried pipeline upper surface are advisable with 200mm.
3. according to the method described in claim 1, it is characterized in that the soil temperature-moisture sensor temperature measurement range -40
℃-120℃；Volumetric water content measurement range 0%-100% or m3/m3。
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| CN111579434B (en) * | 2020-05-24 | 2023-02-17 | 河北工业大学 | Method for establishing soil heat-moisture coupling model test similarity criterion |
| CN112113448B (en) * | 2020-09-23 | 2021-07-09 | 安徽农业大学 | Method for determining equivalent heat transfer coefficient of heat pipe embedded in oscillating plow breast |
| CN112396943A (en) * | 2020-12-04 | 2021-02-23 | 河北工业大学 | Experiment box and experiment method for simulating leakage of underground heat distribution pipeline |
| CN113945244B (en) * | 2021-11-09 | 2023-04-25 | 广东电网有限责任公司电力科学研究院 | Soil state monitoring device for direct-buried GIL fault early warning |
| CN114216063B (en) * | 2021-12-17 | 2023-10-24 | 天津求实飞博科技有限公司 | Method for determining leakage information of thermal pipeline |
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| RU2549564C1 (en) * | 2014-02-20 | 2015-04-27 | Общество с ограниченной ответственностью АП "ДИсСО" | Method to determine transport heat losses in underground heat supply network in operation mode |
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