CN210803324U - Long-term monitoring device for cracks of cross-welded holes of orthotropic steel box girder - Google Patents
Long-term monitoring device for cracks of cross-welded holes of orthotropic steel box girder Download PDFInfo
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- CN210803324U CN210803324U CN201920731754.2U CN201920731754U CN210803324U CN 210803324 U CN210803324 U CN 210803324U CN 201920731754 U CN201920731754 U CN 201920731754U CN 210803324 U CN210803324 U CN 210803324U
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Abstract
The utility model relates to a long-term monitoring devices of orthotropic steel box girder solder hole crackle, the device includes: a power module: used for providing power for the linear transmission component; the linear transmission component: the micro-distance camera is in transmission connection with the power module and used for enabling the micro-distance camera to move linearly; microspur camera: the device is arranged on the linear transmission assembly and used for collecting the apparent image of the welding seam of the orthotropic steel box girder. Compared with the prior art, the utility model has the advantages of modularization, expansibility are good, it is clear to shoot, angle freedom, thing allies oneself with the management.
Description
Technical Field
The utility model belongs to the technical field of steel box girder safety monitoring and specifically relates to a long-term monitoring devices of orthotropic steel box girder cross welding hole crackle is related to.
Background
The steel box girder is currently applied to a large number of cable-stayed bridges and suspension bridges, but the combined action of the internal stress of the long-term wheel load action and the welding residual stress leads to stress concentration at the welding and section abrupt change positions, thereby generating fatigue cracks on the steel box girder. And along with the increase of the service life of the bridge, the crack can be rapidly expanded. Therefore, the cracks of the steel box girder need to be regularly detected and even monitored so as to obtain the development condition of the cracks and further adopt proper reinforcement measures to control the cracks.
At present, the crack detection of the steel box girder is mainly based on manual detection, namely, a detection worker enters the girder and identifies and records the crack by adopting methods such as visual inspection, ultrasonic detection and the like. But the manual detection method has low efficiency and consumes more manpower and material resources; the standardization degree of manual detection is low, the method is easily influenced by subjective factors of detection workers, and reliable crack identification and measurement criteria are difficult to form; meanwhile, manual detection is limited by the structure and the processing mode of the steel box girder, and corners in the girder such as the over-welding holes are inconvenient for manual detection and measurement.
Aiming at the defects of the traditional manual detection method, a series of research and development and exploration works are carried out by scholars at home and abroad. For example, crack detection is performed by using a novel detection technology such as an acoustic emission technology, so that the detection precision is improved; in a fatigue experiment, a pre-embedded capacitance sensor or a multifunctional carbon nano tube and the like are adopted to monitor cracks; the magnetic crawling robot is developed and used for carrying out inspection work inside the steel box girder and the like. But the developed equipment has low automation degree and still depends on a large amount of manpower; most monitoring sensors need to be embedded, and the real bridge is inconvenient; the inspection robot is limited by the complex environment inside the steel box girder and is in the test stage at present. Therefore, no perfect solution is available at present for automatic detection or long-term monitoring of the cracks of the steel box girder.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a long-term monitoring devices of orthotropic steel box girder solder hole crackle in order to overcome the defect that above-mentioned prior art exists.
The purpose of the utility model can be realized through the following technical scheme:
a long-term monitoring device for the cracks of an orthotropic steel box girder through welding holes comprises:
a power module: used for providing power for the linear transmission component;
the linear transmission component: the micro-distance camera is in transmission connection with the power module and used for enabling the micro-distance camera to move linearly;
microspur camera: the device is arranged on the linear transmission assembly and used for collecting the apparent image of the welding seam of the orthotropic steel box girder.
The linear transmission assembly comprises a collection shell with an opening on the upper surface, a linear guide rail fixed in the collection shell through a bolt, a guide rail slide block sliding on the linear guide rail, and a limit switch and an idler wheel which are arranged at the far end of the linear guide rail, wherein the limit switch and the idler wheel are arranged on the far end of the linear guide rail, and the microspur camera is fixed on the guide rail slide block.
The power module constitute by power module middle section and the power module outer section of pegging graft respectively in the power module middle section left and right sides, the power module middle section pass through to be connected the mouth and gather the shell fixedly, be equipped with step motor in the left side power module outer section, step motor pass through the synchronizing wheel and be connected with the idler transmission with the last guide rail slider of linear guide, be equipped with the usb receiver on the power module outer section of right side, the usb receiver in be equipped with the control panel for information transmission, this control panel is connected with microspur camera and step motor.
The macro camera is an HFUS-B4.5 macro camera, and the linear guide rail is an ST5C linear guide rail.
The control panel is a NanoPi main control panel, a network antenna interface, a signal interface, a power interface, an indicator light and a switch are arranged on the control panel, the network antenna interface is used for accessing an antenna to supply signals, and the signal interface is used for being connected with a network in a wired mode.
The power module is fixed on the steel box girder top plate through the mechanical magnetic gauge stand, and freely rotates to adjust the angle through a lever arm on the mechanical magnetic gauge stand, so that the acquisition image capture in the full range is realized.
The use method of the device comprises the following steps:
1) factory configuration: after the device is assembled, connecting the device with the Internet, and performing initial configuration through a server, wherein the initial configuration comprises equipment configuration and network configuration;
2) field installation: a mechanical magnetic gauge stand is adopted for installation and fixation, each welding hole is provided with one mechanical magnetic gauge stand, the transverse interval is 50cm, the longitudinal interval is 2-3cm, one end of each magnetic gauge stand is used for clamping the device shell, and the other end of each magnetic gauge stand is used for adsorbing the steel box girder top plate;
3) calibrating a camera: after the installation is finished, a standard checkerboard calibration board is adopted for camera calibration, camera parameters are obtained, and for size processing of crack images, perspective transformation processing of the images is utilized: obtaining camera parameters, generating a projection transmission transformation matrix consisting of a linear transformation matrix, a translation matrix and a perspective transformation matrix, and multiplying the original image coordinate points by the projection transmission transformation matrix to obtain a new standard crack image;
4) crack collection and uploading: for each crack acquisition, acquiring a series of continuous crack images, uploading the crack images through the cloud of a server, realizing communication between a client and a server through REST service, uploading the images one by one, obtaining feedback of each uploading, deleting the pictures if the uploading is successful, and keeping the pictures in the local area if the uploading is failed;
5) equipment management: after the crack image is uploaded, storing and managing pictures through a webpage end background embedded into a database for subsequent algorithm implantation and data analysis, firstly, enhancing the image through linear gray scale stretching, removing image noise through median filtering, segmenting a crack part in the image and a background image by using a threshold segmentation method based on pixel coordinate points, and finally, identifying gray scale difference change through edge detection to detect the crack and finish crack identification.
Compared with the prior art, the utility model has the advantages of it is following:
1) the device main body is modularized and is divided into an acquisition module, a power module and a control module, and other sensors can be connected to acquire corresponding data, so that the device has good expandability.
2) Utilize the macro lens, guarantee to cross the clear shooting of welding hole crackle, adopt magnetism to inhale the formula fixed, have fine suitability to the steel box girder environment.
3) And the Internet of things management is realized through a matched webpage end. And in the later stage, image splicing and recognition algorithms are deployed on the server, so that the automatic extraction and data analysis of the characteristics of the crack length, the crack width and the like are realized.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a front view of the structure of the present invention.
Fig. 3 is a schematic structural diagram of a power module.
Fig. 4 is a schematic structural diagram of the control board.
Fig. 5 is a flow chart of initial configuration.
Fig. 6 is a connection diagram for field installation.
Fig. 7 is a flow chart of camera calibration.
Fig. 8 is a flow chart of crack acquisition and upload.
The notation in the figure is:
1. the power module, 2, connect the mouth, 3, gather the shell, 4, linear guide, 5, rail block, 6, microspur camera, 7, endoscope shell, 8, limit switch, 9, idler, 10, power module outer segment, 11, power module middle section, 12, step motor, 13, synchronizing wheel, 14, usb receiver, 15, network antenna interface, 16, signal interface, 17, power source, 18, pilot lamp, 19, switch.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Examples
As shown in fig. 1-4, the utility model provides a long-term monitoring devices of orthotropic steel box girder solder hole crackle, the device passes through mechanical magnetic force gauge stand to be fixed on steel box girder roof, including HFUS-B4.5 microspur camera, camera linear transmission, USB receiver 14, gather shell 3 and linear guide 4, step motor 12, NanoPi main control board, switch 19 and pilot lamp 18.
The device is divided into the following modules according to functions:
a first module: the acquisition module comprises an HFUS-B4.5 macro camera 6, a linear transmission assembly, a USB storage box 14, an acquisition shell 3 and a linear guide rail 4;
and a second module: and a power module including a stepper motor 12.
And a third module: and the control module comprises a NanoPi main control panel, a switch 19 and an indicator light 18.
The connection relationship of the device is as follows:
the power module is fixed by a mechanical magnetic meter seat arranged on a top plate of the steel box girder through magnetic force formed by closed magnetic lines of force, and a strong magnetic lever arm on the mechanical magnetic meter seat can rotate freely after a connecting screw of the mechanical magnetic meter seat is unscrewed, so that the power module is driven to realize capture in all ranges; the acquisition module is screwed and fixed on the power module through screws, and the HFUS-B4.5 microspur camera is clamped into the ST5C linear guide rail, so that information transmission is realized through the USB wire storage box; the control module is fixed by a strong magnetic lever, the flat cable is connected with the other two parts, and the NanoPi is combined with the switch and the indicator light to jointly complete the control of the system.
The utility model discloses orthotropic steel box girder crosses weld hole crackle long-term monitoring devices's application method specifically includes following step:
1) factory configuration: after the equipment is assembled according to all the modules, the equipment is firstly connected with the Internet and initially configured through the server side. The configuration includes device configuration and network configuration, as shown in fig. 5;
2) field installation: and (3) installing and fixing each module by adopting a magnetic gauge stand, installing one magnetic gauge stand at each over-welding hole, wherein the transverse interval is 50cm, the longitudinal interval is 2-3cm, one end of each magnetic gauge stand clamps the module shell, and the other end of each magnetic gauge stand adsorbs the steel box girder top plate. In addition, the acquisition module and the power module are screwed by screws, and the power module and the control module are transmitted by a flat cable, as shown in fig. 6;
3) calibrating a camera: after the installation is completed, the difficulty of measuring the viewing distance and the installation error make the obtained picture inaccurate. Therefore, camera calibration is required, camera parameters are calculated by adopting a standard checkerboard calibration plate, and for size processing of crack images, perspective transformation processing of the images is required: firstly, camera parameters need to be obtained, then a projection transmission transformation matrix consisting of a linear transformation matrix, a translation matrix and a perspective transformation matrix is generated according to the parameters, and the original image coordinate points are multiplied by the matrix to obtain a new standard crack image, as shown in fig. 7;
4) crack collection and uploading: crack collection and uploading are the main work of crack monitors. For each crack collection, the camera returns to the zero point, and the working steps of photographing and advancing are repeated until the work is finished, so that a series of continuous crack images are obtained. And then uploading the crack images through the cloud of the server, realizing communication between the client and the server through REST service, uploading the images one by one, and obtaining feedback of each uploading. If the uploading is successful, deleting the picture, and if the uploading is failed, keeping the picture locally, as shown in fig. 8;
5) equipment management: after the crack image is uploaded, the image is stored and managed through a webpage end background embedded into a database, and subsequent algorithm implantation and data analysis are carried out. The computer firstly enhances the image through linear gray stretching, removes image noise through median filtering, uses a threshold segmentation method based on pixel coordinate points to segment crack parts in the image from a background image, and finally identifies gray difference change through edge detection so as to detect cracks and finish crack identification work.
Claims (5)
1. The utility model provides a long-term monitoring devices of orthotropic steel box girder solder hole crackle, its characterized in that, the device includes:
power module (1): used for providing power for the linear transmission component;
the linear transmission component: the linear transmission assembly comprises a collection shell (3) with an opening on the upper surface, a linear guide rail (4) fixed in the collection shell (3) through a bolt, a guide rail sliding block (5) sliding on the linear guide rail (4), a limit switch and an idler wheel (9) arranged on the far end of the linear guide rail (4), wherein the limit switch and the idler wheel (9) are arranged on the far end of the linear guide rail (4), and the macro camera (6) is fixed on the guide rail sliding block (5);
macro camera (6): the device is arranged on the linear transmission assembly and used for collecting the apparent image of the welding seam of the orthotropic steel box girder.
2. The orthotropic steel box girder via-weld hole crack long-term monitoring device according to claim 1, it is characterized in that the power module (1) is composed of a power module middle section (11) and power module outer sections (10) respectively inserted at the left side and the right side of the power module middle section (11), the middle section (11) of the power module is fixed with the collecting shell (3) through a connecting nozzle (2), a stepping motor (12) is arranged in the outer section (10) of the power module on the left side, the stepping motor (12) is in transmission connection with a guide rail sliding block (5) and an idler wheel (9) on the linear guide rail (4) through a synchronizing wheel (13), a usb storage box (14) is arranged on the outer section (10) of the right power module, a control panel for information transmission is arranged in the usb storage box (14), the control board is connected with the macro camera (6) and the stepping motor (12).
3. The apparatus for monitoring the long-term crack of the over-welded hole of the orthotropic steel box girder according to claim 1, wherein the macro camera (6) is a HFUS-B4.5 macro camera, and the linear guide rail (4) is a ST5C linear guide rail.
4. The orthotropic steel box girder through-weld hole crack long-term monitoring device as claimed in claim 2, wherein the control board is a NanoPi master control board, a network antenna interface (15), a signal interface (16), a power interface (17), an indicator light (18) and a switch (19) are arranged on the control board, the network antenna interface (15) is used for connecting an antenna supply signal, and the signal interface (16) is used for connecting a network in a wired manner.
5. The orthotropic steel box girder through-weld hole crack long-term monitoring device as claimed in claim 1, wherein the power module (1) is fixed on the steel box girder top plate through a mechanical magnetic gauge stand, and freely rotates for angle adjustment through a lever arm on the mechanical magnetic gauge stand, so as to realize acquisition image capture in a full range.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920731754.2U CN210803324U (en) | 2019-05-21 | 2019-05-21 | Long-term monitoring device for cracks of cross-welded holes of orthotropic steel box girder |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920731754.2U CN210803324U (en) | 2019-05-21 | 2019-05-21 | Long-term monitoring device for cracks of cross-welded holes of orthotropic steel box girder |
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| CN210803324U true CN210803324U (en) | 2020-06-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110044925A (en) * | 2019-05-21 | 2019-07-23 | 上海黑塞智能科技有限公司 | A kind of orthotropic steel box girder crosses welding hole crackle long term monitoring device |
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- 2019-05-21 CN CN201920731754.2U patent/CN210803324U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110044925A (en) * | 2019-05-21 | 2019-07-23 | 上海黑塞智能科技有限公司 | A kind of orthotropic steel box girder crosses welding hole crackle long term monitoring device |
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