CN111692979A - System and method for detecting height of tunnel secondary lining cloth based on thermal imaging - Google Patents
System and method for detecting height of tunnel secondary lining cloth based on thermal imaging Download PDFInfo
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- CN111692979A CN111692979A CN202010554592.7A CN202010554592A CN111692979A CN 111692979 A CN111692979 A CN 111692979A CN 202010554592 A CN202010554592 A CN 202010554592A CN 111692979 A CN111692979 A CN 111692979A
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- 238000001931 thermography Methods 0.000 title claims abstract description 48
- 239000004744 fabric Substances 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title abstract description 11
- 238000012545 processing Methods 0.000 claims abstract description 38
- 238000001228 spectrum Methods 0.000 claims abstract description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 14
- 238000001514 detection method Methods 0.000 claims description 7
- 229910052742 iron Inorganic materials 0.000 claims description 7
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 5
- 238000001914 filtration Methods 0.000 abstract description 6
- 238000010276 construction Methods 0.000 abstract description 5
- 238000005260 corrosion Methods 0.000 abstract description 4
- 230000007797 corrosion Effects 0.000 abstract description 4
- 230000011218 segmentation Effects 0.000 abstract description 4
- 239000000463 material Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000002146 bilateral effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
- G01B11/06—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material
- G01B11/0608—Height gauges
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T5/00—Image enhancement or restoration
- G06T5/20—Image enhancement or restoration using local operators
- G06T5/30—Erosion or dilatation, e.g. thinning
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/10—Segmentation; Edge detection
- G06T7/136—Segmentation; Edge detection involving thresholding
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/30—Subject of image; Context of image processing
- G06T2207/30108—Industrial image inspection
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- Physics & Mathematics (AREA)
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- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Lining And Supports For Tunnels (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
The invention relates to the field of tunnel construction, in particular to a system and a method for detecting the height of a tunnel secondary lining cloth based on thermal imaging, which comprises a thermal imaging camera, a tunnel secondary lining trolley and a heat source, and has the advantages that the thermal imaging camera is utilized to receive energy emitted by a template and the heat source of the tunnel secondary lining trolley in an infrared wavelength spectrum and process the infrared energy to generate a thermal image, image processing and analyzing software is utilized to carry out processing such as filtering, corrosion, threshold segmentation and the like on the thermal image, the image quality of the thermal image is improved, a clear concrete high-temperature area being poured is obtained, then the height of the concrete pouring position from the ground is calculated, the progress of the pouring cloth of the secondary lining is known in real time, a cloth distributing machine is conveniently controlled and switched and connected, a head does not need to be stretched into a window by a worker for observation, the labor intensity of the worker is reduced, and the potential safety, the safety of workers is guaranteed, and necessary conditions are provided for realizing full-automatic construction of the two linings.
Description
Technical Field
The invention relates to the field of tunnel processing, in particular to a system and a method for detecting the height of a tunnel secondary lining material based on thermal imaging.
Background
The tunnel secondary lining concrete adopts an integral hydraulic tunnel trolley as a template, after the concrete transportation tank car is transported to the site, the concrete transportation tank car pours the concrete layer by layer from bottom to top through a concrete delivery pump, and the poured section from the opening direction is poured towards the palm surface direction by utilizing the chute and the pouring window in a one-way sequential bilateral symmetry manner, and the two linings on the upper layer can be continuously poured after the two linings on the lower layer are poured, but the traditional detection of the cloth height of the two linings is observed by the electro-manual lighting through the head of a worker extending into the pouring window, so that the labor capacity of the worker is increased, and certain potential safety hazards exist.
Disclosure of Invention
The invention provides a system for detecting the height of a secondary lining cloth in a tunnel based on thermal imaging, which aims to solve the problems that the height of the secondary lining pouring cloth is detected by a worker stretching the head into a pouring window through flashlight illumination in the prior art, the labor capacity of the worker is increased, and certain potential safety hazards exist.
The invention adopts the following technical scheme: a system and a method for detecting the height of a secondary lining cloth of a tunnel based on thermal imaging comprise a thermal imaging camera, a tunnel trolley and a heat source, wherein the outer surface of the tunnel trolley is tightly attached to the surface of a reinforcing steel bar frame covering the inner wall of the tunnel;
the thermal imaging camera is movably arranged in the tunnel trolley and is right opposite to the inner wall of the tunnel trolley;
the thermal imaging camera is wirelessly connected with the image processing and analyzing software, and the image processing and analyzing software is connected with the display through the serial server;
the number of the heat sources is three, the heat sources are all arranged on the same axial vertical plane in the tunnel trolley, and a right-angled triangle structure is formed among the three heat sources.
A detection method of a system for detecting the height of a tunnel secondary lining cloth based on thermal imaging is characterized by comprising the following steps: firstly, fixing three heat sources close to a tunnel on one side of a second lining; fixing the tunnel at one side far away from the second lining by using the thermal imaging camera, starting pouring the second lining of the tunnel, receiving energy emitted from an iron plate of the tunnel trolley and three heat sources by using the thermal imaging camera in an infrared wavelength spectrum, and processing the infrared energy to generate a real-time thermal image; thirdly, transferring the thermal image generated by the thermal imaging camera to image processing and analyzing software in a wireless mode; fourthly, the thermal image can be filtered, corroded and the like by utilizing image processing and analyzing software; fifthly, segmenting the image by using a threshold value through image processing and analyzing software to generate a corresponding binary image; selecting a high-temperature area by using a minimum rectangular frame through image processing and analyzing software, calculating the positions and distances among three heat sources at the corners of the rectangular frame by using the three heat sources as the original points and the coordinate system of the thermal image, and obtaining the height of the concrete pouring position from the ground according to the proportion of the distances among the three heat sources on the thermal image to the distances among the three heat sources in the real tunnel; and seventhly, displaying and storing the processed real-time thermal image and the calculated height of the concrete being poured in a display by the image processing and analyzing software through a serial server, namely finishing the detection of the pouring height of the secondary lining cloth of the tunnel.
From the above description of the structure of the present invention, compared with the prior art, the present invention has the following advantages: the method comprises the steps of receiving energy emitted by an iron plate and a heat source of a tunnel trolley through an infrared wavelength spectrum by using a thermal imaging camera, processing the infrared energy to generate a thermal image, carrying out filtering, corrosion, threshold segmentation and other processing on the thermal image by using image processing and analyzing software, improving the image quality of the thermal image to obtain a clear high-temperature area of concrete being poured, then calculating the height of the concrete being poured away from the ground, knowing the progress of pouring and distributing of a secondary lining in real time, conveniently controlling and switching a distributing machine, pouring different layers through different windows, and observing without extending heads into the windows by workers.
Drawings
Fig. 1 is a schematic structural view of a tunnel trolley.
Fig. 2 is a schematic view of the position structure of the thermal imaging camera, the tunnel trolley and the heat source.
Fig. 3 is a schematic diagram of an electrical connection structure of the thermal imaging camera, the image processing and analyzing software, the serial server and the display.
Fig. 4 is a schematic diagram of a thermal image generated by a thermal imaging camera.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
As shown in fig. 2, a system for detecting the height of a tunnel secondary lining material based on thermal imaging comprises a thermal imaging camera 1, a tunnel trolley 2 and a heat source 4, wherein a window 21 on the outer surface of the tunnel trolley 2 is tightly attached to the surface of a reinforcing steel bar frame 3 covering the inner wall of a tunnel, concrete is continuously conveyed along a pipeline by using pressure through a concrete conveying pump truck during pouring, and then the concrete is injected onto the reinforcing steel bar frame 3 between the tunnel trolley 2 and the inner wall of the tunnel from the window 21 through a material distributor and a chute for tunnel secondary lining.
As shown in fig. 2, the thermal imaging camera 1 is movably disposed inside the tunnel trolley 2, and the thermal imaging camera 1 faces the inner wall of the tunnel trolley 2. When the height of the casting cloth of the tunnel secondary lining needs to be detected, the thermal imaging camera 1 is moved in the tunnel trolley 2, the thermal imaging camera 1 is far away from the tunnel on one side of the tunnel on the secondary lining to be fixed, the wide angle of the thermal imaging camera 1 is ensured to be enough to irradiate the top of the tunnel trolley 2, the temperature of an iron plate of the tunnel trolley 2 at the position is higher than that of other positions due to the fact that the temperature of concrete which is just cast is high, the thermal imaging camera 1 receives energy emitted by the iron plate of the tunnel trolley 2 through an infrared wavelength spectrum and processes the infrared energy to generate a thermal image, and a thermal mode in a scene is detected in real time.
As shown in fig. 3, the thermal imaging camera 1 is wirelessly connected to the image processing and analyzing software 5, the thermal image generated by the thermal imaging camera 1 is wirelessly transmitted to the image processing and analyzing software 5, the image processing and analyzing software 5 can perform filtering, erosion and other processing on the thermal image, and the image filtering is to suppress the noise of the target image under the condition of keeping the detail features of the image as much as possible, the image erosion is mainly used in morphology to remove some parts of the image so as to eliminate the noise and tiny holes generated in the formation and transmission processes of the thermal image, so as to improve the quality of the thermal image and make the display effect of the thermal image clearer, and then the image is divided by using a threshold value, which is a widely used dividing technique, and the image is regarded as a combination of two types of regions (target region and background region) with different gray levels by using the difference in the gray characteristics between the target region to be extracted and the background in the image, and selecting a reasonable threshold value to determine whether each pixel point in the image belongs to a target area or a background area, so as to generate a corresponding binary image, so that the display effect of the thermal image is clearer, and a clear concrete high-temperature area being poured is obtained.
As shown in fig. 3, the image processing and analyzing software 5 is connected with the display 7 through the serial server 6, the image processing and analyzing software 5 displays and stores the processed real-time thermal image and the calculated height of the concrete being poured in the display 7 through the serial server 6, the serial server 6 is used as a communication bridge between the display 7 and the image processing and analyzing software 5, the display 7 and the serial server 6 are connected through a network cable, the serial server 6 supplies power through DC24V, and a power supply mode of converting AC220V into DC24V is collected in the power distribution control cabinet.
As shown in fig. 2 and fig. 4, three heat sources 4 are provided, the heat sources 4 are all arranged on the same axial vertical plane in the tunnel trolley 2, a right-angled triangle structure is formed between the three heat sources 4, two heat sources 4 on the right-angled sides are placed on the ground, the heat sources 4 are preferably spherical heating wires, the heating effect is good, the temperature is high, and the heat sources are convenient for the thermal imaging camera 1 to capture, when the height of the cast fabric of the tunnel secondary lining needs to be detected, the three heat sources 4 are moved in the tunnel trolley 2, so that the three heat sources 4 are close to the tunnel on one side of the secondary lining to be fixed, the thermal imaging camera 1 can display the three heat sources 4 on a thermal image when generating the thermal image, an isosceles right-angled triangle structure is formed between the three heat sources 4, the length of the sides is 1 meter, and the heat source 4 on the intersection point of the two sides, and the other two heat sources 4 vertical to the origin are used as coordinate systems, the image processing and analyzing software 5 is used for selecting the high-temperature area by using a minimum rectangular frame, calculating the positions and distances between the three heat sources 4 at the corner of the rectangular frame, obtaining the distance between the corner of the rectangular frame and the heat source 4 in the real tunnel according to the proportion of the distance between the three heat sources 4 on the thermal image to the distance between the three heat sources 4 in the real tunnel, the height that the concrete is being poured promptly, the thermal image that utilizes thermal imaging camera 1 to shoot can know the pouring progress of two linings in real time, and the cloth machine is switched in the control of being convenient for, goes different window 21 pouring different layers, need not the workman and stretches into window 21 to observe, alleviates workman's amount of labour, gets rid of the potential safety hazard, ensures workman's safety, can improve the efficiency of construction of two linings simultaneously, provides the essential condition for the full-automatic construction of two linings.
A detection method of a system for detecting the height of a tunnel secondary lining cloth based on thermal imaging is characterized by comprising the following steps:
moving three heat sources 4 in a tunnel trolley 2, enabling the three heat sources 4 to be close to a tunnel on one side of a second lining for fixing, and forming an isosceles right triangle structure among the three heat sources 4, wherein the length of a right-angle side is 1 m;
secondly, moving the thermal imaging camera 1 in the tunnel trolley 2, fixing the thermal imaging camera 1 far away from the tunnel on one side of the tunnel on which the two linings are arranged, ensuring that the wide angle of the thermal imaging camera 1 is enough to irradiate the top of the tunnel trolley 2 and the three heat sources 4, then continuously conveying concrete along a pipeline by using pressure through a concrete conveying pump truck, injecting the concrete into a reinforcing steel bar frame 3 between the tunnel trolley 2 and the inner wall of the tunnel from a window 21 through a material distributor and a chute to carry out tunnel two-lining pouring material distribution, and because the temperature of the concrete just poured is high, the temperature of an iron plate of the tunnel trolley 2 at the position is higher than that of other positions, the thermal imaging camera 1 can receive energy emitted from the iron plate of the tunnel trolley 2 and the three heat sources 4 by infrared wavelength spectrums and process infrared energy to generate a real-time thermal image so as to detect a thermal mode in a scene in time;
thirdly, transferring the thermal image generated by the thermal imaging camera 1 to image processing and analyzing software 5 in a wireless mode;
fourthly, the image processing and analyzing software 5 can be used for carrying out filtering, corrosion and other processing on the thermal image, wherein the image filtering is to suppress the noise of the target image under the condition of keeping the detailed characteristics of the image as much as possible, and the image corrosion is mainly used for removing some parts of the image in morphology so as to eliminate the noise and tiny holes generated in the forming and transmission processes of the thermal image, improve the image quality of the thermal image and enable the display effect of the thermal image to be clearer;
fifthly, segmenting the image by using a threshold through image processing and analyzing software 5, wherein the image threshold segmentation is a widely applied segmentation technology, the difference of the gray characteristics of a target area to be extracted from the image and the background of the target area is utilized, the image is regarded as the combination of two types of areas (the target area and the background area) with different gray levels, and a more reasonable threshold is selected to determine whether each pixel point in the image belongs to the target area or the background area, so that a corresponding binary image is generated, the display effect of the thermal image is clearer, and a clear concrete high-temperature area which is being poured is obtained;
sixthly, selecting a high-temperature area by using a minimum rectangular frame through image processing and analyzing software 5, calculating the positions and distances between the corner of the rectangular frame and three heat sources 4 by using the heat sources 4 at the intersection points of two right-angle sides as the original points of the thermal images and using the other two heat sources 4 perpendicular to the original points as coordinate systems, and obtaining the distance between the corner of the rectangular frame in the actual tunnel and the heat sources 4 in the vertical direction, namely the height of the place where the concrete is poured from the ground according to the proportion of the distance between the three heat sources 4 on the thermal images and the distance between the three heat sources 4 in the actual tunnel;
seventhly, the image processing and analyzing software 5 displays and stores the processed real-time thermal image and the calculated height of the concrete being poured in the display 7 through the serial server 6, namely, the detection of the pouring height of the two lining materials in the tunnel is completed, the progress of the two lining pouring materials is known in real time by utilizing the thermal image shot by the thermal imaging camera 1, the material distributing machine is convenient to control and switch, different windows 21 are used for pouring different layers, workers do not need to stretch heads into the windows 21 for observation, the labor capacity of the workers is reduced, potential safety hazards are eliminated, the safety of the workers is guaranteed, and basic conditions are provided for full-automatic construction of the two lining materials.
The control modes of the thermal imaging camera 1, the image processing analysis software 5, the serial server 6 and the display 7 are automatically controlled by the controller, the control circuit of the controller can be realized by simple programming of a person skilled in the art, and the method belongs to the common knowledge in the field.
The above description is only an embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modifications made by using the design concept should fall within the scope of infringing the present invention.
Claims (2)
1. The utility model provides a system for detecting two lining cloth height in tunnel based on thermal imaging which characterized in that: the device comprises a thermal imaging camera, a tunnel trolley and a heat source, wherein the outer surface of the tunnel trolley is tightly attached to the surface of a reinforcing steel bar frame covering the inner wall of a tunnel;
the thermal imaging camera is movably arranged in the tunnel trolley and is right opposite to the inner wall of the tunnel trolley;
the thermal imaging camera is wirelessly connected with the image processing and analyzing software, and the image processing and analyzing software is connected with the display through the serial server;
the number of the heat sources is three, the heat sources are all arranged on the same axial vertical plane in the tunnel trolley, and a right-angled triangle structure is formed among the three heat sources.
2. A detection method of a system for detecting the height of a tunnel secondary lining cloth based on thermal imaging is characterized by comprising the following steps:
firstly, fixing three heat sources close to a tunnel on one side of a second lining;
fixing the tunnel at one side far away from the second lining by using the thermal imaging camera, starting pouring the second lining of the tunnel, receiving energy emitted from an iron plate of the tunnel trolley and three heat sources by using the thermal imaging camera in an infrared wavelength spectrum, and processing the infrared energy to generate a real-time thermal image;
thirdly, transferring the thermal image generated by the thermal imaging camera to image processing and analyzing software in a wireless mode;
fourthly, the thermal image can be filtered, corroded and the like by utilizing image processing and analyzing software;
fifthly, segmenting the image by using a threshold value through image processing and analyzing software to generate a corresponding binary image;
selecting a high-temperature area by using a minimum rectangular frame through image processing and analyzing software, calculating the positions and distances among three heat sources at the corners of the rectangular frame by using the three heat sources as the original points and the coordinate system of the thermal image, and obtaining the height of the concrete pouring position from the ground according to the proportion of the distances among the three heat sources on the thermal image to the distances among the three heat sources in the real tunnel;
and seventhly, displaying and storing the processed real-time thermal image and the calculated height of the concrete being poured in a display by the image processing and analyzing software through a serial server, namely finishing the detection of the pouring height of the secondary lining cloth of the tunnel.
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| CN113585269A (en) * | 2021-09-27 | 2021-11-02 | 国能大渡河大数据服务有限公司 | Construction safety monitoring method and system for hydropower engineering |
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| 杨涛: "《探地雷达和红外热像仪在西藏寺院和敦煌石窟空鼓壁画保护中的应用》", 《中国博士学位论文全文数据库 •哲学与人文科学辑》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112523499A (en) * | 2020-12-07 | 2021-03-19 | 中建海峡建设发展有限公司 | Hydraulic creeping formwork and distributing machine integrated device and construction method |
| CN113585269A (en) * | 2021-09-27 | 2021-11-02 | 国能大渡河大数据服务有限公司 | Construction safety monitoring method and system for hydropower engineering |
| CN113585269B (en) * | 2021-09-27 | 2021-12-17 | 国能大渡河大数据服务有限公司 | Construction safety monitoring method and system for hydropower engineering |
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|---|---|
| CN111692979B (en) | 2021-11-05 |
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