CN101504283B - Detection method for pipe diameter of underground non-metal pipe - Google Patents
Detection method for pipe diameter of underground non-metal pipe Download PDFInfo
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- CN101504283B CN101504283B CN2009100378955A CN200910037895A CN101504283B CN 101504283 B CN101504283 B CN 101504283B CN 2009100378955 A CN2009100378955 A CN 2009100378955A CN 200910037895 A CN200910037895 A CN 200910037895A CN 101504283 B CN101504283 B CN 101504283B
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- 238000001514 detection method Methods 0.000 title claims abstract description 28
- 229910052755 nonmetal Inorganic materials 0.000 title claims description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 239000002689 soil Substances 0.000 claims description 9
- 230000005540 biological transmission Effects 0.000 claims description 5
- 230000015572 biosynthetic process Effects 0.000 claims description 5
- 230000011514 reflex Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 8
- 230000008901 benefit Effects 0.000 abstract description 2
- 239000004033 plastic Substances 0.000 description 10
- 239000011152 fibreglass Substances 0.000 description 6
- 230000006872 improvement Effects 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000005755 formation reaction Methods 0.000 description 4
- 238000009412 basement excavation Methods 0.000 description 3
- 244000062793 Sorghum vulgare Species 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 235000019713 millet Nutrition 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
一种地下非金属管管径的探测方法，充分利用了雷达发射电磁波的多次反射波之间的走时间距，本发明使用地质雷达探测采取地下非金属管道的多次反射波后；在雷达主机上依次读取地质雷达多次反射波的反射走时；根据反射波之间的走时间距的特点按照运算式求取管道的管径。本发明经济效益高，探测精度高，使用范围广泛。
A method for detecting the pipe diameter of an underground non-metallic pipe fully utilizes the travel time distance between multiple reflected waves of electromagnetic waves emitted by radar. The present invention uses geological radar to detect multiple reflected waves of underground non-metallic pipes; The main engine reads the reflection travel time of multiple reflection waves of the geological radar in sequence; according to the characteristics of the travel time distance between the reflection waves, the pipe diameter of the pipeline is obtained according to the calculation formula. The invention has high economic benefit, high detection precision and wide application range.
Description
Technical field
The present invention relates to the detection method of underground non-metal caliber, specifically is that the applied geology radar is realized the detection to underground nonmetallic pipe caliber.
Background technology
In the acceptance survey work of underground utilities, the caliber of pipeline is a very important attribute.Because in urban road, pipeline not only quantity is huge, and the distribution of pipeline and arrange intricate.To accurately distinguish various pipelines, unlikelyly cause erroneous judgement, will grasp the unusual attribute of actual measurement pipeline as far as possible fully.This wherein caliber be a very important attribute.Such as, the original diameter of the pipeline that has is 100mm, becomes 200mm after the transformation; Do not remove and old pipeline is only discarded; When surveying, can find two pipelines simultaneously, except the caliber difference of pipeline, other attributes of these two pipelines are all identical; At this time, the size of detection caliber just becomes the important evidence of distinguishing two pipelines.
At present, geological radar is able to widespread use in underground utilities are surveyed, and has technically obtained great progress.But all the time, geological radar just is used for surveying the position and the buried depth of underground utilities basically, for the caliber of pipeline, all is to utilize given data or excavation evidence obtaining basically.Sometimes also can utilize the width of radar wave that caliber is estimated, but that its error of such way tends to is very big, technology is very immature.
Summary of the invention
For addressing the above problem; The invention discloses a kind of detection method of underground non-metal caliber; The applied geology radar carries out line to underground nonmetallic pipe and surveys; Through the electromagnetic repeatedly computing of walking time interval between the reflection wave, realize accurate detection to the pipeline caliber to the geology radar emission.
Geological radar exploration is a kind of geophysical prospecting method that the difference in dielectric constant with underground different medium is the basis.Show that like Fig. 1 to the pulse of underground emission high-frequency electromagnetic, this pulse can produce reflection wave when in the underground propagation process, running into the change in dielectric constant interface on object and stratum in the stratum through emitting antenna for it.Reflection wave is propagated back and is received antenna behind the face of land and receives; And import it into main frame and write down and show; Each measuring point receives electromagnetic waveforms one, on survey line all the electromagnetic waveforms of measuring points be arranged in together, form complete radar section; Through the aftertreatment of data, just carry out the parameters such as position, distribution range, buried depth that inversion interpretation can obtain subsurface formations (like surface layer, cement stabilizing layer) or underground object (like underground utilities, cavity, reinforcing bar, canal case etc.).
Therefore as shown in Figure 2, be the principle of geologic radar detection pipeline: during the downward launching electromagnetic wave of radar antenna, have certain side angle, when antenna and no show pipeline top side, the electromagnetic wave of its emission " shifts to an earlier date " and detects pipeline.As shown in Figure 2: when radar antenna moved to the A point, its electromagnetic wave was emitted to pipe and goes up A ' point, reflexes to radar antenna, and the distance of its operation is 2AA ', and be 2AA '/V working time
C soil, V wherein
C soilBeing electromagnetic wave travelling speed in the native medium, on the radar record time cross-section, is 2AA '/V in the A following time of point correspondingly just like this
C soilRadar return appears in the place, and when native medium evenly the time, the distance of its demonstration is exactly AA ', i.e. A under A point " put reflection wave, AA appear "=AA '.Several points that so occur as: A " B " C " D ", the arc reflection wave of formation promptly is the radar reflection wave mode of pipeline like this.
Repeatedly the formation of reflection wave is as shown in Figure 3 for it: when electromagnetic wave was emitted to pipe and goes up A ' point, it can be decomposed into pipeline tangential direction A ' E and point to two components of center of circle O (direction is A ' O) perpendicular to tangential direction, continued to propagate downwards along the electromagnetic wave of A ' E direction; Electromgnetically-transparent along A ' O direction is gone in the pipeline, propagates through the center of circle through pipeline internal medium and arrives pipeline to millet cake F point, meets tube wall and produces reflection again; Directly be back to A ' point along FA ' direction; Produce reflection and transmission at A ' some place, transmitted wave direction wherein is along A ' F ', and it is along the component of A ' A direction; Being back to radar antenna is that radar receives; The radar secondary reflection ripple of Here it is pipeline, the path of its operation is 2AA '+2A ' F, the time of operation is 2AA '/V
C soil+ 2A ' F/Vc, wherein V
C soilBe electromagnetic wave travelling speed in the native medium, and Vc is the electromagnetic wave travelling speed of pipeline medium.When the pipeline medium was water, its velocity of wave was about 1/3 of native medium.Therefore, the radar secondary reflection ripple of the underground non-metal pipeline position that can occur should be at Mintrop wave A " 2A ' F/Vc place is equivalent to 6A ' F/V under the point
C soil, promptly can appear at Mintrop wave A " the following A of 3d (pipe diameter) of point " " position, but not the Mintrop wave A of people's imagination " the some A ' of d (pipe diameter) down " position, to such an extent as to people can be regarded as irrelevant interference with it by mistake.Like this; Radar is gone in the pipeline at the Electromgnetically-transparent of A ' O direction, propagates through the center of circle through pipeline internal medium and arrives pipeline to millet cake F point, meets tube wall and produces reflection again; Directly be back to A ' point and form reflection wave again again, so form reflection wave repeatedly along FA ' direction.Thereby repeatedly walk time interval between the reflection wave according to above-mentioned radar emission is electromagnetic, through rational collecting method and computing, can accurately survey the caliber of underground non-metal line.
Be realization the object of the invention, a kind of detection method of underground non-metal caliber, the detection method of said underground non-metal caliber adopts geological radar, it is characterized in that, and underground non-metal is in the state of the medium that is full of low velocity of wave high-k; Angle between the vertical direction of the electromagnetic wave of the transmission antennas transmit of said geological radar and said underground non-metal pipeline is α, and 0 °≤α≤45 °, and the step of the detection method of said underground non-metal caliber is:
A. use geologic radar detection to take the repeatedly reflection wave of underground non-metal pipeline, its concrete steps are: select to survey profile position, the geological radar section is perpendicular to the trend of underground non-metal pipeline, and it is smooth that the ground of geological radar section keeps; Select the frequency of geological radar antenna; Connect main frame, antenna and power supply, acquisition parameter is set after opening the geological radar main frame; Promote the geological radar car, gather the geological radar section, obtain repeatedly geological radar reflection wave;
B. on radar host computer, read repeatedly T during the reflecting away of reflection wave of geological radar successively
1, T
2, T
3T
4
C. ask for the caliber of pipeline by arithmetic expression, said arithmetic expression is:
D＝Vc×∑(T
i+1-T
i)/2(n-1)，
In said arithmetic expression: Vc is the velocity of electromagnetic wave of the medium of said low velocity of wave high-k, and unit is m/ns; T
I+1, T
iWhen being the walking of adjacent up and down reflection wave, unit is ns; N is the geological radar wave reflection total degree that detects.
As improvement, in said step a, when selecting the frequency of geological radar antenna, the antenna frequencies of selecting when surveying the depth of burying greater than the underground non-metal pipeline of 3m is 100MHz; Surveying the depth of burying is 200MHz, 400MHz or 600MHz in the antenna frequencies that 3m selects during with interior underground non-metal pipeline.
As improvement, in said step a, when acquisition parameter is set: the time window be chosen as 80～150ns; Select automatic gain to transfer and establish detecting parameter, automatic gain is transferred when establishing, and geological radar antenna is passed through directly over underground non-metal pipeline; Range finding wheel parameter is selected, and the SI must not be greater than 0.1m.
As improvement, in said step a, obtain repeatedly the geological radar ripple after, if the data of gathering are undesirable, transfer again and establish gain: like overflow, then let antenna through reflection the most doughtily section gain and reset; As signal excessively a little less than, then let antenna gain and reset through the most weak location of reflection.
As improvement, in said step a,, the geological radar section is surveyed to the parallel row that moves again in both sides if still can not effectively survey after gain established in accent again.
As improvement, the medium of said low velocity of wave high-k is a water, in said arithmetic expression, and Vc
Water=0.033m/ns.
Compared with prior art; The present invention has made full use of that radar emission is electromagnetic repeatedly walks time interval between the reflection wave; Changed in the past when underground nonmetallic pipe line reflection multiple reflection occurs unusually, just be left in the basket always, even much thought the detection method of interference wave.In addition, the present invention is according to the detection method that time interval is designed a kind of brand-new underground non-metal caliber of walking between between multiple reflection reflection, and its beneficial effect is:
(I) promoted the use value and the detectivity of geological radar, changed geological radar and can only survey the position of underground utilities and the present situation of buried depth;
(II) have great economic benefit, utilized given data or excavation evidence obtaining to waste time and energy in the past, and expend greatlyyer, the present invention has practiced thrift a large amount of detection costs utilizing the purpose that can realize sound-pipe spool footpath under the situation at non-excavation of existing equipment;
(III) detection accuracy is high, and deviation range is minimum, combines the information such as buried and position of pipeline can help that the detection personnel are accurate to recognize underground different pipeline.
(IV) usable range is extensive, can be applied to the detection of multiple underground non-metal caliber.
Description of drawings
Fig. 1 is radar ultimate principle thoroughly;
Fig. 2 is that the radar return of pipeline forms principle schematic;
Fig. 3 is the formation principle schematic of the radar reflection multiple reflection of pipeline;
Fig. 4 is the first radar reflection image of first plastic tube;
Fig. 5 is the second radar reflection image of first plastic tube;
Fig. 6 is the first radar reflection image of second plastic tube;
Fig. 7 is the second radar reflection image of second plastic tube;
Fig. 8 is the first radar reflection image of glass reinforced plastic pipe;
Fig. 9 is the second radar reflection image of glass reinforced plastic pipe;
Figure 10 is the 3rd a radar reflection image of glass reinforced plastic pipe.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
Embodiment one
Extremely shown in Figure 7 like Fig. 4; One the street is numbered in the underground nonmetal feed pipe final acceptance of construction of 07J3345 in south, Dabu, Guangzhou; Two underground nonmetal feed pipes to be respectively first plastic tube and the caliber that caliber is 0.1m be second plastic tube of 0.15m, described two underground nonmetal feed pipes are in the state of water supply; Angle between the electromagnetic wave of the transmission antennas transmit of geological radar and the vertical direction of said underground nonmetal feed pipe is α, and 0 °≤α≤45 °, and its detection steps is:
A. use geologic radar detection to take the repeatedly reflection wave of underground non-metal pipeline.At first, the correct selection surveyed profile position: the radar section will be perpendicular to the trend of pipeline, and it is smooth that the ground of radar section will keep, and does not have interference such as well lid, iron block, electric wire, section not to be laid in the hi-line below on the section; Secondly, correctly select radar antenna, the range of choice of antenna frequencies is 100MHz～600MHz: select the 100MHz antenna when surveying the pipeline that is embedded in below the 3m, when investigation depth is selected 200MHz, 400MHz or 600MHz during with interior pipeline at 3m; Again and, connect main frame, antenna, power supply, open radar host computer, in main frame, start the K2 function software, acquisition parameter correctly is set: window is chosen as 80～150ns when (1), must not be greater than 150ns; (2) select " automatic gain " to transfer and establish detecting parameter, when the automatic gain accent is established, should let radar antenna directly over pipeline, pass through; (3) range finding wheel parameter is selected: the SI must not be greater than 0.1m; At last, promote radar truck, gather the radar section in the present embodiment and surpass 50, obtain like Fig. 5 to repeatedly geological radar ripple shown in Figure 8.
B. on radar host computer, open the K2 program, check the radar waveform figure that has gathered, read T
1, T
2, T
3T
i
C. according to arithmetic expression D=Vc
Water* ∑ (T
I+1-T
iCalculate)/2 (n-1), wherein Vc
WaterBe the velocity of electromagnetic wave of water, Vc
Water=0.033m/ns; The PIPE DIAMETER CALCULATION value of first plastic tube is 0.033 * (30.2-12.2)/6=0.1m among Fig. 5, and error is 0; The first plastic tube PIPE DIAMETER CALCULATION value is 0.033 * (30.6-13.2)/6=0.097m among Fig. 6, and error is 0.003m, and relative error is 3%; The second plastic tube PIPE DIAMETER CALCULATION value is 0.033 * (44.0-6.4)/8=0.155m among Fig. 7, and error is 0.005m, and relative error is 3.33%; The second plastic tube PIPE DIAMETER CALCULATION value is 0.033 * (46.2-17.6)/6=0.157m among Fig. 8, and error is 0.007m, and relative error is 4.67%.
Wherein in above-mentioned steps a; If the data of gathering are undesirable; Select following method to repeat to survey: I, transfer and establish gain again, as overflow then let antenna through reflection the most doughtily section gain and reset, then let antenna gain a little less than crossing like signal and reset through the most weak location of reflection; II, still can not effectively survey like the I method, can the radar section be moved to both sides are parallel, row is surveyed again.
Embodiment two
As shown in Figure 8, when a underground non-metal was surveyed on the Xi Wan road in the Guangzhou, this underground non-metal was that caliber is the glass reinforced plastic pipe of 0.6m, and said glass reinforced plastic pipe is in the state of water supply; Angle between the electromagnetic wave of the transmission antennas transmit of geological radar and the vertical direction of said glass reinforced plastic pipe is α, and 0 °≤α≤45 °, and its detection steps is:
A. use geologic radar detection to take the repeatedly reflection wave of said underground GRP pipe.At first, the correct selection surveyed profile position: the radar section will be perpendicular to the trend of pipeline, and it is smooth that the ground of radar section will keep, and does not have interference such as well lid, iron block, electric wire, section not to be laid in the hi-line below on the section; Secondly, correctly select radar antenna, the range of choice of antenna frequencies is 100MHz～600MHz: select the 100MHz antenna when surveying the pipeline that is embedded in below the 3m, when investigation depth is selected 200MHz, 400MHz or 600MHz during with interior pipeline at 3m; Again and, connect main frame, antenna, power supply, open radar host computer, in main frame, start the K2 function software, acquisition parameter correctly is set: window is chosen as 80～150ns when (1), must not be greater than 150ns; (2) select " automatic gain " to transfer and establish detecting parameter, when the automatic gain accent is established, should let radar antenna directly over pipeline, pass through; (3) range finding wheel parameter is selected: the SI must not be greater than 0.1m; At last, promote radar truck, gather the radar section, obtain repeatedly geological radar ripple as shown in Figure 9.
B. on radar host computer, open the K2 program, check the radar waveform figure that has gathered, read T
1, T
2, T
3T
i
C. according to arithmetic expression D=Vc
Water* ∑ (T
I+1-T
iCalculate)/2 (n-1), wherein Vc
WaterBe the velocity of electromagnetic wave of water, Vc
Water=0.033m/ns; The PIPE DIAMETER CALCULATION value is 0.033 * (60.0-24.6)/2=0.584m among Fig. 8, and error is 0.016m, and relative error is 2.67%; The PIPE DIAMETER CALCULATION value is 0.033 * (67.8-31.2)/2=0.604m among Fig. 9, and error is 0.004m, and relative error is 0.67%; The PIPE DIAMETER CALCULATION value is 0.033 * (65.6-28.8)/2=0.607m among Figure 10; Error is 0.007m, and relative error is 1.17%.The material of GRP pipe, actual caliber are all examined through driving a well in the present embodiment.
Wherein in above-mentioned steps a; If the data of gathering are undesirable; Select following method to repeat to survey: I, transfer and establish gain again, as overflow then let antenna through reflection the most doughtily section gain and reset, then let antenna gain a little less than crossing like signal and reset through the most weak location of reflection; II, still can not effectively survey like the I method, can the radar section be moved to both sides are parallel, row is surveyed again.
Claims (2)
1. the detection method of a underground non-metal caliber, the detection method of said underground non-metal caliber adopts geological radar, it is characterized in that, and underground non-metal is in the state of the medium that is full of low velocity of wave high-k; Angle between the vertical direction of the electromagnetic wave of the transmission antennas transmit of said geological radar and said underground non-metal pipeline is α, and 0 °≤α≤45 °, and the step of the detection method of said underground non-metal caliber is:
A. use geologic radar detection to take the repeatedly reflection wave of underground non-metal pipeline, its concrete steps are: select to survey profile position, the geological radar section is perpendicular to the trend of underground non-metal pipeline, and it is smooth that the ground of geological radar section keeps; Select the frequency of geological radar antenna; Connect main frame, antenna and power supply, acquisition parameter is set after opening the geological radar main frame; Promote the geological radar car, gather the geological radar section, obtain repeatedly geological radar ripple;
B. on radar host computer, read repeatedly T during the reflecting away of reflection wave of geological radar successively
1, T
2, T
3T
i
C. ask for the caliber of pipeline by arithmetic expression, said arithmetic expression is:
D＝Vc×∑(T
i+1-T
i)/2(n-1)，
In said arithmetic expression: Vc is the velocity of electromagnetic wave of the medium of said low velocity of wave high-k, and unit is m/ns; T
I+1, T
iWhen being the walking of adjacent up and down reflection wave, unit is ns; N is the geological radar wave reflection total degree that detects; In said step a, when selecting the frequency of geological radar antenna, the antenna frequencies of selecting when surveying the depth of burying greater than the underground non-metal pipeline of 3m is 100MHz; Surveying the depth of burying is 200MHz, 400MHz or 600MHz in the antenna frequencies that 3m selects during with interior underground non-metal pipeline;
In said step a, when acquisition parameter is set: the time window be chosen as 80～150ns; Select automatic gain to transfer and establish detecting parameter, automatic gain is transferred when establishing, and geological radar antenna is passed through directly over underground non-metal pipeline; Range finding wheel parameter is selected, and the SI must not be greater than 0.1m;
In said step a, obtain repeatedly the geological radar ripple after, if the data of gathering are undesirable, transfer again and establish gain: like overflow, then let antenna through reflection the most doughtily section gain and reset; As signal excessively a little less than, then let antenna gain and reset through the most weak location of reflection;
In said step a,, the geological radar section is surveyed to the parallel row that moves again in both sides if still can not effectively survey after gain established in accent again;
When radar antenna moved to the A point, its electromagnetic wave was emitted to pipe and goes up A ' point, reflexes to radar antenna, and the distance of its operation is 2AA ', and be 2AA '/Vc working time
Soil, Vc wherein
SoilBeing electromagnetic wave travelling speed in the native medium, on the radar record time cross-section, is 2AA '/Vc in the A following time of point correspondingly just like this
SoilRadar return appears in the place, and when native medium was even, the distance of its demonstration was exactly AA '; I.e. A under the A point " reflection wave appears in point; AA "=AA ', several points that so occur as: A " B " C " D ", the arc reflection wave of formation promptly is the radar reflection wave mode of pipeline like this.
2. the detection method of a kind of underground non-metal caliber according to claim 1 is characterized in that: the medium of said low velocity of wave high-k is a water, in said arithmetic expression, and Vc
Water=0.033m/ns.
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| CN102353980B (en) * | 2011-09-30 | 2013-04-17 | 铁道第三勘察设计院集团有限公司 | Equidistant three-point seismic prospecting method for detecting deeply-buried nonmetallic pipeline |
| CN103675922B (en) * | 2013-12-13 | 2016-03-30 | 南京工业大学 | Operation period underground pipeline pipe diameter measuring method based on ground penetrating radar |
| CN104020495B (en) * | 2014-06-24 | 2015-05-06 | 中国矿业大学(北京) | Automatic underground pipeline parameter recognizing method on basis of ground penetrating radar |
| CN107677197B (en) * | 2017-09-19 | 2019-08-30 | 贵州电网有限责任公司 | A kind of volume measurement device and measurement method of buried target body |
| CN108680137A (en) * | 2018-04-24 | 2018-10-19 | 天津职业技术师范大学 | Earth subsidence detection method and detection device based on unmanned plane and Ground Penetrating Radar |
| CN109239788A (en) * | 2018-11-14 | 2019-01-18 | 广州瑾诚测绘有限公司 | A kind of detection method and device of pipe diameter of underground non-metal pipe |
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