A ground penetrating radar for tunnel and a detection line auxiliary positioning device carried by the ground penetrating radar

Abstract

The utility model discloses a kind of ground penetrating radar for tunnel and the detection survey line auxiliary positioning device carried by it, including optical signal transceiver unit, central control unit, alarm unit, data storage unit;Optical signal transceiver unit includes digital-analog converter and the adaptive ball type laser ranging device, planar laser ranging device respectively connected with it;Central control unit includes central control single-chip microcomputer and the distance threshold setting module connected with it;Central control single-chip microcomputer is connected optical signal transceiver unit, alarm unit and data storage unit respectively, for according to the collection information of two ranging devices of the optical signal transceiver unit and the alarm threshold value control alarm unit alarm of distance threshold setting module, and control data storage unit stores survey line real-time position information.The above-mentioned auxiliary positioning device can be flexibly installed on ground penetrating radar antenna, effectively solve the problems of heavy mechanical equipment, poor space adaptability, insufficient positioning accuracy and high artificial dependence in traditional method.

Description

Technical Field

[0001] This utility model relates to the field of ground penetrating radar detection, and in particular to a ground penetrating radar for tunnels and its mounted detection survey line auxiliary positioning device. Background Technology

[0002] As underground space development moves towards greater precision, traditional shallow subsurface media detection methods suffer from inherent limitations such as insufficient directional control and significant geological disturbances, severely restricting their application scope. Against this backdrop, Ground Penetrating Radar (GPR) technology, based on the principle of electromagnetic wave reflection, has gradually become the mainstream solution for non-destructive testing in underground engineering. Since its engineering application in the 1990s, this technology has been successfully applied to scenarios such as tunnel lining structure integrity detection, surrounding rock condition assessment, and hidden defect identification, thanks to its advantages of non-contact detection and efficient data acquisition. Particularly in the field of highway tunnel engineering inspection, GPR technology has formed a complete technical system encompassing hardware equipment, data acquisition, and image interpretation methods. Its ability to simultaneously acquire multi-dimensional information such as structural thickness and defect distribution in a single inspection has established its irreplaceable position in the industry.

[0003] However, engineering practice shows that the core limiting factor for the detection effectiveness of ground-penetrating radar lies in the accuracy control of the survey line positioning. In tunnel arch inspection operations, when the antenna trajectory deviates from the preset survey line by more than the allowable deviation threshold, the following technical defects will occur:

[0004] 1) Mismatch between detection data and spatial location information leads to errors in the location of structural defects;

[0005] 2) Repeated detection of the same section generates data redundancy, reducing detection efficiency;

[0006] 3) Areas missed during inspection create blind spots for potential safety hazards.

[0007] In existing technologies, line positioning mainly relies on two solutions: manual marking and vehicle-mounted auxiliary devices. The former relies on ground observers instructing operators to adjust the antenna attitude in real time, which suffers from the problem of accumulated human error. The latter, such as the detection vehicle solution proposed in patent CN202410384919A (A Tunnel Ground Penetrating Radar Advanced Prediction Auxiliary Detection Vehicle), achieves three-dimensional antenna positioning through mechanized devices, but its vehicle-type structure limits the device's size, making it unsuitable for the confined space of the tunnel arch during operation. Similarly, patent CN117075059A (Vehicle-mounted Ground Penetrating Radar Tunnel On-site Line Positioning and Real-time Marking Method and Device) uses a laser-marking rod composite positioning system, but it is still constrained by the vehicle's mobility, making it difficult to achieve continuous and accurate positioning in the arch area. Further research reveals the following common bottlenecks in current technological development:

[0008] 1) External positioning devices (such as the measurement marking device of CN219320499U (a device for rapid measurement marking radar detection of tunnel survey lines), the portable carrier of CN106855617A (a portable carrier and method for tunnel detection radar)) need to be mounted on the radar antenna through mechanical connection, which increases the effective load of the antenna by about 20% to 25%, significantly affecting the detection mobility;

[0009] 2) Rigid structural design is difficult to adapt to changes in tunnel curvature, which will cause attitude deviation when detecting irregular cross-sections and make it difficult to ensure that the antenna is continuously in close contact with the detection surface, resulting in a reduction in the quality of raw data acquisition.

[0010] 3) In the manual-assisted positioning mode of the surface observer, due to factors such as noisy environment and long sound propagation time at the detection site, the operator may miss hearing or delay response, resulting in a lag in trajectory correction.

[0011] Therefore, the aforementioned technical deficiencies have, to some extent, limited the reliability of ground-penetrating radar detection in complex tunnel environments, and the industry urgently needs a new line-finding solution. Utility Model Content

[0012] The technical problem to be solved by this utility model is to provide a detection and positioning auxiliary device for tunnel ground penetrating radar, which can be flexibly installed on the antenna of the tunnel ground penetrating radar. It effectively solves the problems of heavy mechanical equipment, poor spatial adaptability, insufficient positioning accuracy and high dependence on manual labor in traditional methods. Ultimately, it realizes accurate spatial mapping between hidden defects in the lining and the coordinates of the survey line, and significantly improves the level of intelligence in tunnel detection operations.

[0013] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0014] This utility model provides a detection and positioning auxiliary device for tunnel ground penetrating radar, which is mounted on the ground penetrating radar antenna and includes an optical signal transceiver unit, a central control unit, an alarm unit, and a data storage unit.

[0015] The optical signal transceiver unit includes a digital-to-analog converter and an adaptive spherical laser rangefinder and a planar laser rangefinder connected thereto. The adaptive spherical laser rangefinder is used to acquire vertical optical signals; the planar laser rangefinder is used to acquire horizontal optical signals; and the digital-to-analog converter is used to convert optical signals into electrical signals.

[0016] The central control unit includes a central control microcontroller and a distance threshold setting module connected to it; the distance threshold setting module is used to set alarm thresholds for antenna line offset in the vertical and horizontal directions; the central control microcontroller is connected to an optical signal transceiver unit, an alarm unit, and a data storage unit, respectively, and is used to control the alarm unit to sound an alarm based on the information collected by the two ranging devices of the optical signal transceiver unit and the alarm threshold of the distance threshold setting module, and to control the data storage unit to store the real-time position information of the survey line.

[0017] As a further improvement of this utility model, the optical signal transceiver unit also includes optical glass respectively disposed in front of the adaptive spherical laser rangefinder and the planar laser rangefinder, the optical glass being used to enhance light focusing.

[0018] Furthermore, the electrical signals generated by the digital-to-analog converter in the optical signal transceiver unit are connected to the central control microcontroller through independent internal circuits and component connection interfaces to realize parallel processing of vertical and horizontal information acquisition. When both reach or exceed the upper limit of the threshold, an alarm is triggered.

[0019] Furthermore, the distance threshold setting module includes an LED display screen, a threshold setting panel, and buttons on the threshold setting panel.

[0020] Furthermore, the alarm unit is an audible and visual alarm unit, including a vibration sound-generating device and a warning light.

[0021] Furthermore, the data storage unit includes a data storage panel and an SD memory card inserted therein, and the data storage unit is used to store real-time location information of the survey line under non-threshold triggering conditions.

[0022] Furthermore, it also includes a rechargeable battery pack that powers the entire device and a charging interface connected to it.

[0023] Furthermore, it also includes a housing, with the adaptive spherical laser rangefinder mounted on one side of the housing, the planar laser rangefinder mounted on the front of the housing, and the back of the housing serving as the mounting surface for the ground-penetrating radar antenna sidewall.

[0024] Furthermore, an adhesive gasket is installed on the mounting surface of the ground-penetrating radar antenna sidewall of the housing.

[0025] This utility model also provides a ground-penetrating radar for tunnels, including a ground-penetrating radar antenna and a detection line auxiliary positioning device mounted on the aforementioned ground-penetrating radar for tunnels. The detection line auxiliary positioning device is fixedly installed on the side wall of the ground-penetrating radar antenna.

[0026] By adopting the above technical solution, this utility model has at least the following advantages:

[0027] (1) The auxiliary positioning device of this utility model can be flexibly mounted on various types of ground-penetrating radar antennas. It is a closed system including an optical signal transceiver unit, a central control unit, an alarm unit and a data storage unit, which overcomes the problems of heavy mechanical equipment and inability to adapt to complex tunnel detection environments in traditional positioning methods.

[0028] (2) This utility model, by setting up an optical signal transceiver unit containing an adaptive spherical laser rangefinder and a planar laser rangefinder, and in conjunction with a central control unit containing a distance threshold setting module and a central control microcontroller, as well as an alarm unit, enables on-site testing. By setting a measurement line offset threshold mode, the testing personnel can adjust the acquisition posture in a very short time, thereby ensuring uninterrupted acquisition of high-quality data. By combining with a data storage unit, the on-site testing process can achieve real-time export of measurement line position information by setting a real-time recording mode for measurement line position information, completing the matching of testing data and spatial position information, and effectively improving the accuracy of ground penetrating radar data interpretation.

[0029] (3) The auxiliary positioning device of this utility model is an embedded survey line positioning system based on an improved acoustic-optical ranging module. By using a flexible detachable and mountable adhesive coupling device to integrate the high-precision positioning module onto the outside of the ground penetrating radar antenna, it can effectively solve the problems of mechanical equipment description, poor spatial adaptability, insufficient positioning accuracy and high dependence on manual labor in traditional methods. Ultimately, it can achieve accurate spatial mapping between the hidden defects of the lining and the survey line coordinates, and significantly improve the level of intelligence in tunnel inspection operations. Attached Figure Description

[0030] The above is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model, the following describes this utility model in further detail with reference to the accompanying drawings and specific embodiments.

[0031] Figure 1 This is a schematic diagram illustrating the implementation principle of the detection and positioning auxiliary device mounted on the ground-penetrating radar for tunnels according to this utility model.

[0032] Figure 2 This is a cross-sectional view of the internal structure of a detection and mapping auxiliary positioning device mounted on a ground-penetrating radar for tunnels, according to an embodiment of the present invention.

[0033] Figure 3 This is a front view of a detection and mapping auxiliary positioning device mounted on a tunnel ground-penetrating radar according to an embodiment of the present invention.

[0034] Figure 4 This is a side view of a detection and mapping auxiliary positioning device mounted on a ground-penetrating radar for tunnels according to an embodiment of the present invention;

[0035] Figure 5 This is a top view of a detection and mapping auxiliary positioning device mounted on a ground-penetrating radar for tunnels according to an embodiment of the present invention.

[0036] The components are as follows: 1-LED display screen; 2-distance threshold setting module; 3-slide switch; 4-button; 5-threshold setting panel; 6-central control microcontroller; 7-light-emitting diode; 8-warning light; 9-vibration sound generator; 10-data storage panel; 11-SD memory card; 12-optical glass; 13-planar laser rangefinder; 14-rechargeable battery pack; 15-charging interface; 16-adaptive spherical laser rangefinder; 17-screw; 18-digital-to-analog converter; 19-component connection interface; 20-integrated circuit board; 21-housing; 22-bonding gasket. Detailed Implementation

[0037] Exemplary embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0038] like Figure 1 As shown, this utility model discloses a detection and positioning auxiliary device for tunnel ground-penetrating radar, which is mounted on the ground-penetrating radar antenna and includes four parts: an optical signal transceiver unit, a central control unit, an alarm unit, and a data storage unit; wherein:

[0039] The optical signal transceiver unit includes an adaptive spherical laser rangefinder 16, a planar laser rangefinder 13, and a digital-to-analog converter 18. The adaptive spherical laser rangefinder 16 and the planar laser rangefinder 13 are respectively connected to the digital-to-analog converter 18. The adaptive spherical laser rangefinder 16 is used to acquire vertical optical signals. For example, the adaptive spherical laser rangefinder 16 can automatically rotate its internal transmitting device according to gravity sensing to ensure that the laser signal is always emitted vertically downwards, so that the light source is projected onto the reference ground in real time. The planar laser rangefinder 13 is used to acquire horizontal optical signals. The digital-to-analog converter 18 is used to convert the optical signals into electrical signals.

[0040] The central control unit includes a central control microcontroller 6 and a distance threshold setting module 2 connected to it. The distance threshold setting module 2 is used to set alarm thresholds for antenna line offset in the vertical and horizontal directions. The central control microcontroller 6 is connected to the optical signal transceiver unit, the alarm unit, and the data storage unit, respectively. It is used to control the alarm unit to sound an alarm based on the information collected by the two ranging devices of the optical signal transceiver unit and the alarm threshold of the distance threshold setting module 2, and to control the data storage unit to store the real-time position information of the measuring line, so as to realize the comprehensive control of the entire device. The alarm unit is preferably an audible and visual alarm unit, including a vibration sound-generating device 9 and a warning light 8, used for vibration sound generation and light flashing to alert on-site inspection personnel to adjust the measuring line position in time. The data storage unit includes a data storage panel 10 and an SD memory card 11 inserted therein. The data storage unit is used to store the real-time position information of the measuring line under non-threshold triggering conditions.

[0041] like Figure 2 , 3 As shown, in this embodiment, the optical signal transceiver unit further includes optical glass 12 disposed in front of the adaptive spherical laser rangefinder 16 and the planar laser rangefinder 13, respectively. The adaptive spherical laser rangefinder 16, the planar laser rangefinder 13, and the optical glass 12 are all located to the left of the digital-to-analog converter 18. The optical glass 12 can converge and enhance the light sources emitted by the adaptive spherical laser rangefinder 16 and the planar laser rangefinder 13 to adapt to the detection environment with insufficient lighting. The optical signals generated by the adaptive spherical laser rangefinder 16 and the planar laser rangefinder 13 are converted into electrical signals by the digital-to-analog converter 18. During detection, an audible and visual alarm is triggered only when the distance information received by both sets of rangefinders reaches or exceeds the upper limit of the threshold.

[0042] like Figure 2 , 3 As shown, in this embodiment, the central control microcontroller 6 includes a component connection interface 19. The central control microcontroller 6 is connected to the digital-to-analog converter 18, the distance threshold setting module 2, the vibration sound generating device 9, and the warning light 8 through the component connection interface 19 and its internal circuitry. The electrical signals generated by the digital-to-analog converter 18 are connected to the central control microcontroller 6 through the component connection interface 19 via independent internal circuitry, enabling parallel processing of vertical and horizontal information acquired by the two sets of optical signal transceivers. The central control microcontroller 6 then determines whether to trigger an audible and visual alarm based on the upper limit of the threshold set by the distance threshold setting module 2.

[0043] like Figure 2 , 3As shown, the distance threshold setting module 2 includes an LED display screen 1, a threshold setting panel 5, and buttons 4 on the threshold setting panel 5. The desired threshold can be input by operating the buttons 4 on the threshold setting panel 5, and the input threshold can be displayed on the LED display screen 1. The distance threshold setting module 2 also includes a slide switch 3.

[0044] like Figure 2 As shown, the warning light 8 may contain two light-emitting diodes 7.

[0045] like Figure 2 As shown, the device also includes a rechargeable battery pack 14 that powers the entire device and a charging interface 15 connected thereto.

[0046] like Figure 2-5 As shown, the device includes a housing 21, an adaptive spherical laser rangefinder 16 mounted on one side (e.g., the left side) of the housing 21, a planar laser rangefinder 13 mounted on the front of the housing 21, and the back of the housing 21 serving as the sidewall mounting surface for the ground-penetrating radar antenna. An adhesive gasket 22 is mounted on the back of the housing. The entire device can be fixed to the ground-penetrating radar antenna using the adhesive gasket 22.

[0047] like Figure 2 As shown, the device disclosed in this utility model is a closed system. The electrical components involved are placed in the integrated circuit board 20 according to functional partitions, and the outer shell 21 is fastened and sealed by screws 17. Finally, an adhesive gasket 22 is added to the back of the outer shell 21.

[0048] The method of using the detection and mapping line auxiliary positioning device mounted on a ground-penetrating radar for tunnels according to this utility model includes the following steps:

[0049] 1) Fix the entire positioning device to the side wall of the ground-penetrating radar antenna using adhesive pads 22;

[0050] 2) Turn on the sliding switch 3 and select different ranging and positioning modes using the button 4. The first mode is the alarm distance threshold setting mode, which triggers the audible and visual alarm structure by setting the antenna offset thresholds in the vertical and horizontal directions to correct the offset measurement line in a timely manner. The specific threshold values ​​are displayed in real time on the LED display screen 1.

[0051] 3) When the ground penetrating radar starts working, the ranging and positioning function is activated simultaneously, and the electrical signal information converted by the digital-to-analog converter 18 will be transmitted to the central control single-chip microcomputer 6 in real time.

[0052] 4) When the offset between the ground-penetrating radar antenna and the predetermined measuring line reaches or exceeds the upper limit of the set threshold, the central control microcontroller 6 transmits a response signal to the vibration sound-generating device 9 and the warning light 8 to trigger an audible and visual alarm.

[0053] 5) On-site testing personnel adjust the antenna position according to the alarm information, reduce the offset between the antenna and the predetermined test line to within the set threshold range, and ensure that the antenna's direction of travel basically coincides with the predetermined test line, and the alarm is lifted.

[0054] 6) The second mode is the real-time recording mode of the survey line position information, that is, no offset threshold is set and no audible and visual alarm structure is triggered.

[0055] 7) When the ground penetrating radar starts working, the ranging and positioning function is activated simultaneously. The electrical signal information converted by the digital-to-analog converter 18 will be transmitted to the central control microcontroller 6 in real time. The central control microcontroller 6 will then input the real-time position information (coordinates) into the data storage panel 10, record the real-time position information, and save it to the SD memory card 11 so that the survey line position information can be exported and the detection data and spatial position information can be matched.

[0056] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications, equivalent changes or alterations made by those skilled in the art using the above-disclosed technical content shall fall within the protection scope of the present utility model.

Claims

1. A detection and mapping auxiliary positioning device mounted on a ground-penetrating radar for tunnels, characterized in that, Used to be mounted on a ground-penetrating radar antenna, including an optical signal transceiver unit, a central control unit, an alarm unit, and a data storage unit; The optical signal transceiver unit includes a digital-to-analog converter and an adaptive spherical laser rangefinder and a planar laser rangefinder connected thereto. The adaptive spherical laser rangefinder is used to acquire vertical optical signals; the planar laser rangefinder is used to acquire horizontal optical signals; and the digital-to-analog converter is used to convert optical signals into electrical signals. The central control unit includes a central control microcontroller and a distance threshold setting module connected to it; the distance threshold setting module is used to set alarm thresholds for antenna line offset in the vertical and horizontal directions; the central control microcontroller is connected to an optical signal transceiver unit, an alarm unit, and a data storage unit, respectively, and is used to control the alarm unit to sound an alarm based on the information collected by the two ranging devices of the optical signal transceiver unit and the alarm threshold of the distance threshold setting module, and to control the data storage unit to store the real-time position information of the survey line.

2. The detection and positioning auxiliary device mounted on a ground-penetrating radar for tunnels according to claim 1, characterized in that, The optical signal transceiver unit also includes optical glass disposed in front of the adaptive spherical laser rangefinder and the planar laser rangefinder, respectively, and the optical glass is used to enhance light focusing.

3. The detection and mapping auxiliary positioning device mounted on a ground-penetrating radar for tunnels according to claim 1, characterized in that, The electrical signals generated by the digital-to-analog converter in the optical signal transceiver unit are connected to the central control microcontroller through independent internal circuits and component connection interfaces to realize parallel processing of vertical and horizontal information acquisition. When both reach or exceed the upper limit of the threshold, an alarm is triggered.

4. The detection and mapping auxiliary positioning device mounted on a ground-penetrating radar for tunnels according to claim 1, characterized in that, The distance threshold setting module includes an LED display screen, a threshold setting panel, and buttons on the threshold setting panel.

5. The detection and positioning auxiliary device mounted on a ground-penetrating radar for tunnels according to claim 1, characterized in that, The alarm unit is an audible and visual alarm unit, which includes a vibration sound-generating device and a warning light.

6. The detection and mapping auxiliary positioning device mounted on a ground-penetrating radar for tunnels according to claim 1, characterized in that, The data storage unit includes a data storage panel and an SD memory card inserted therein. The data storage unit is used to store real-time location information of the survey line under non-threshold triggering conditions.

7. The detection and mapping auxiliary positioning device mounted on a ground-penetrating radar for tunnels according to claim 1, characterized in that, It also includes a rechargeable battery pack that powers the entire device and a charging interface connected to it.

8. The detection and mapping auxiliary positioning device mounted on a ground-penetrating radar for tunnels according to any one of claims 1-7, characterized in that, It also includes a housing, with the adaptive spherical laser rangefinder mounted on one side of the housing, the planar laser rangefinder mounted on the front of the housing, and the back of the housing serving as the mounting surface for the ground-penetrating radar antenna sidewall.

9. The detection and mapping auxiliary positioning device mounted on a ground-penetrating radar for tunnels according to claim 8, characterized in that, An adhesive gasket is installed on the mounting surface of the ground-penetrating radar antenna sidewall of the housing.

10. A ground-penetrating radar for tunnels, comprising a ground-penetrating radar antenna, characterized in that, It also includes a detection and positioning auxiliary device mounted on a ground-penetrating radar for tunnels as described in any one of claims 1-9, wherein the detection and positioning auxiliary device is fixedly installed on the side wall of the ground-penetrating radar antenna.

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