Railway tunnel operation geological radar detection support and detection method

Abstract

The application discloses an operating railway tunnel geological radar detection support and a detection method, and belongs to the technical field of radar antennas. The detection support comprises a clamping mechanism, a supporting telescopic rod device and a magnetic type base. The clamping mechanism is connected with the upper supporting rod of the supporting telescopic rod device through a universal cross byte mechanism. The supporting telescopic rod device comprises an upper supporting rod with a guide rail, a gear fixing device and a lower supporting rod. The gear fixing device is fixed on the lower supporting rod and connected with the guide rail of the upper supporting rod to adjust the length of the device. The bottom of the lower supporting rod is fixedly connected with the magnetic type base. The application does not need manual holding of the antenna, can adapt to detection requirements of different cross-section tunnels and various operation platforms, guarantees continuous and stable detection data, reduces operation safety hazards and improves detection efficiency.

Description

Technical Field

[0001] This specification relates to the field of radar antenna technology, and in particular to a geological radar detection bracket and detection method for operating railway tunnels. Background Technology

[0002] In the routine maintenance and inspection of operating railway tunnels, ground-penetrating radar (GPR) detection is a crucial technical means to investigate internal defects such as cracks, voids, and water leakage in the tunnel lining. The degree of contact between the GPR antenna and the lining surface directly determines the reliability of the detection data, playing a vital role in ensuring railway operational safety. With the continuous increase in the mileage of operating railway tunnels in my country, the workload of tunnel lining inspection is constantly increasing, placing higher demands on the efficiency and accuracy of inspection operations.

[0003] Currently, most ground-penetrating radar (GPR) inspections rely on manual handheld antennas for data acquisition. During the operation, operators must constantly hold the antenna and keep it in close contact with the lining surface. Due to human error and physical exertion, the antenna is prone to shifting or detaching from the inspection surface, compromising the continuity and stability of the inspection data. Furthermore, manual handheld operation is labor-intensive, inefficient, and poses significant safety risks in track areas, making it difficult to meet the demands of large-scale, high-frequency tunnel inspections.

[0004] Existing ground-penetrating radar detection auxiliary supports generally suffer from insufficient adaptability. They are incompatible with different types of radar antennas and are difficult to adapt to the detection needs of different locations such as the arch and sidewalls of tunnels with different cross-sectional sizes. Furthermore, the installation and disassembly process of the supports on the work platform is complicated, the fixation reliability is poor, and the antenna angle cannot be adaptively adjusted according to the undulation of the lining surface during the detection process, which still makes it difficult to effectively improve the efficiency of detection operations and data quality. Summary of the Invention

[0005] This specification provides one or more embodiments of a geological radar detection bracket for operating railway tunnels, including a clamping mechanism, a support telescopic rod device, and a magnetic base.

[0006] The clamping mechanism is connected to the upper support rod of the support telescopic rod device via a universal joint mechanism;

[0007] The telescopic support rod device includes an upper support rod with a guide rail, a gear fixing device, and a lower support rod. The gear fixing device is fixed to the lower support rod and connected to the guide rail of the upper support rod to adjust the length of the telescopic support rod device.

[0008] The bottom of the lower support rod is fixedly connected to the magnetic base.

[0009] In some embodiments, the clamping mechanism includes a rubber damping wheel, a structural main beam, an elastic bracing mechanism, a bracing, a universal joint mechanism, and a ground-penetrating radar antenna limiting device, wherein the rubber damping wheel, the elastic bracing mechanism, the bracing, and the ground-penetrating radar antenna limiting device are all disposed on the structural main beam.

[0010] In some embodiments, the rubber damping wheel rotates about a central axis and is in contact with the surface of the ground-penetrating radar antenna.

[0011] In some embodiments, the diagonal bracing elastic mechanism consists of a longitudinal tie rod and a spring. The main beam of the structure is provided with a plurality of adjustment holes, and the diagonal bracing elastic mechanism can be detachably installed on the adjustment holes for adjusting the clamping force.

[0012] In some embodiments, one end of the diagonal brace is hinged to the rubber damping wheel, and the other end is connected to the main structural beam, for transmitting the frictional force of the rubber damping wheel and the tension of the diagonal brace elastic mechanism.

[0013] In some embodiments, the ground-penetrating radar antenna limiting device has an L-shaped structure and is located at the forward direction end of the clamping mechanism.

[0014] In some embodiments, the universal ten-byte mechanism includes a driving fork, a driven fork, a cross shaft, and a needle roller bearing;

[0015] The active fork is rigidly connected to the main structural beam, and the driven fork is rigidly connected to the upper support rod.

[0016] The cross shaft has two pairs of mutually perpendicular journals, and the needle roller bearing is installed between the journals of the cross shaft and the universal joint fork hole.

[0017] The driving fork and the driven fork are used to swing relative to each other in any plane about the center of the cross axis.

[0018] In some embodiments, the upper support rod includes a force transmission mechanism and a telescopic guide rail control mechanism, the telescopic guide rail control mechanism being engaged with the gear fixing device; the gear fixing device is provided with an adjustment knob, the adjustment knob being connected to the gear, for driving the gear to rotate by rotating the adjustment knob, thereby causing the guide rail of the upper support rod to slide.

[0019] In some embodiments, the magnetic base includes a non-magnetic body, a magnetic body, and a magnetic body;

[0020] The magnetic body is a rotatable bar permanent magnet, located at the internal center of the magnetic base;

[0021] The non-magnetic material is disposed between the magnetic material and the magnetic material;

[0022] The magnetic conductor is the external base structure of the magnetic base, and the magnetic conductor is made of soft magnetic material;

[0023] The magnetic base is equipped with a rotating handle, which is connected to the magnetic body to achieve the rotation of the magnetic body.

[0024] One or more embodiments of this specification also provide a method for detecting ground-penetrating radar in operating railway tunnels, including the following steps:

[0025] S1. Place the ground-penetrating radar antenna in the clamping mechanism so that the antenna is in contact with the surface of the rubber damping wheel. Use the ground-penetrating radar antenna limiting device to limit the antenna axially. According to the antenna size and clamping requirements, install the inclined brace elastic mechanism in the corresponding hole of the main beam of the structure and adjust the spring tension.

[0026] S2. Use fixing screws to connect the driven fork of the universal joint mechanism to the top of the upper support rod of the support telescopic rod device, and adjust the swing angle of the universal joint mechanism to allow the clamping mechanism to rotate freely in the front, back and left and right.

[0027] S3. Place the magnetic base in the desired position on the metal work platform, rotate the external handle on the magnetic base to rotate the magnetic body to the up and down direction of the two poles, so that the magnetic base is firmly attached to the work platform.

[0028] S4. Fix the bottom of the lower support rod of the telescopic support device into the fixed seat of the magnetic base, check the connection strength, and ensure that the telescopic support device and the magnetic base are not loose.

[0029] S5. According to the tunnel cross-section dimensions and detection height requirements, rotate the gear fixing device adjustment knob on the rotating support telescopic rod device to drive the gear to rotate, which will cause the upper support rod to slide up and down along the guide rail, and adjust the overall length of the support telescopic rod device until the ground radar antenna is tightly attached to the tunnel lining detection surface.

[0030] S6. Propel the work platform along the tunnel track to conduct ground radar detection. During the detection process, the universal joint mechanism automatically adjusts the angle according to the undulation of the tunnel lining surface. The rubber damping wheel rotates freely with the antenna to ensure that the antenna is always in close contact with the lining surface and completes continuous data acquisition.

[0031] S7. After the inspection is completed, rotate the gear fixing device adjustment knob in the opposite direction to shorten the length of the support telescopic rod device. Then rotate the external handle of the magnetic base to drive the magnetic body to rotate to the horizontal direction of the two poles, release the magnetic adsorption, remove the inspection bracket from the work platform, disassemble the ground radar antenna, and complete the inspection operation.

[0032] Beneficial effects

[0033] 1. By combining a clamping mechanism, an adjustable-length support telescopic rod device, and a magnetic base with a universal joint movable connection structure, the operation of railway tunnel geological radar detection eliminates the need for manual operation of the antenna. It can adapt to the detection needs of tunnels with different cross-sections and various operating platforms, effectively ensuring the continuous and stable detection data, while reducing operational safety hazards and improving detection efficiency.

[0034] 2. By integrating the rubber damping wheel, the diagonal brace elastic mechanism, the diagonal brace, the ground-penetrating radar antenna limiting device, and the universal joint mechanism onto the main structural beam, the clamping mechanism becomes an independently detachable clamping functional unit. This not only adapts to ground-penetrating radar antennas of various sizes but also facilitates rapid on-site assembly and maintenance, thereby improving the preparation efficiency of detection operations.

[0035] 3. By adopting a clamping structure that uses a rubber damping wheel that can rotate around its own central axis to fit the surface of the ground radar antenna, the sliding friction generated by the relative movement of the antenna and the lining surface is converted into rolling friction. This reduces the resistance to movement and the wear on the antenna surface. At the same time, the damping characteristics of the rubber material can prevent unnecessary movement of the antenna when it is subjected to external forces, ensuring the stability of the antenna clamping state.

[0036] 4. By setting multiple adjustment holes on the main structural beam for disassembly and installation of the diagonal bracing elastic mechanism, it is possible to flexibly adapt to the clamping force requirements of different sizes and models of ground-penetrating radar antennas, ensuring stable antenna clamping while avoiding damage to the antenna shell due to excessive clamping force.

[0037] 5. By adopting a diagonal bracing structure with one end hinged to the rubber damping wheel and the other end connected to the main structural beam, the tension output by the diagonal bracing elastic mechanism can be evenly transmitted to the rubber damping wheel, so that the wheel surface of the rubber damping wheel is evenly pressed against the side surface of the ground-penetrating radar antenna, avoiding antenna loosening and displacement caused by insufficient local pressing force. It can also smoothly transmit the frictional force of antenna movement on the rubber damping wheel during the detection process to the main structural beam, avoiding the rubber damping wheel from swaying under force, preventing jamming and uneven wear of the rubber damping wheel, and extending the service life of the rubber damping wheel while ensuring the antenna clamping firmness.

[0038] 6. By setting an L-shaped ground-penetrating radar antenna limiting device at the forward direction end of the clamping mechanism, the antenna can be directly prevented from axial displacement due to reverse friction during the detection process. There is no need to add additional straps, buckles or other auxiliary fixing structures, which simplifies the antenna disassembly and assembly steps. At the same time, it can ensure that the antenna installation position is always consistent with the preset detection position, further improving the stability of antenna fixing and avoiding interference from antenna displacement to the detection operation.

[0039] 7. By adopting a universal joint structure with a cross shaft and needle roller bearings, and by rigidly connecting the active fork to the main structural beam, the driven fork to the upper support rod, and the universal joint with a rigid connection between the cross shaft and the main support beam, and by limiting the range of the universal joint's swing angle, the detection bracket can flexibly adapt to the installation requirements of different detection positions such as tunnel arches and sidewalls. It can ensure that the antenna is always in contact with the lining surface without repeated manual adjustments, effectively improving the efficiency of detection operations and the quality of data acquisition.

[0040] 8. The telescopic adjustment structure, which uses the guide rail with meshing teeth on the upper support rod and the adjustment knob of the gear fixing device, allows the length of the support telescopic rod device to be conveniently and accurately adjusted to meet the various detection height requirements of tunnels with different cross-sections. After adjustment, the support state can be stably locked to prevent the support height from shifting during operation, effectively ensuring the fit between the ground radar antenna and the lining surface.

[0041] 9. By adopting a magnetic base structure with an internal rotatable bar permanent magnet, a non-magnetic body, a soft magnetic material magnetic body, and a matching rotating handle, the testing bracket can be quickly fixed and disassembled on a metal work platform without additional installation tools. In the fixed state, the support is stable and there is no displacement, which effectively improves the efficiency of on-site testing and the stability of the bracket during the testing process.

[0042] 10. By adopting a standardized inspection process that sequentially completes the following steps: adapter clamping of the ground-penetrating radar antenna, connection of the clamping mechanism to the support structure, rapid adsorption and fixation of the magnetic base, precise adjustment of the support height, follow-up detection and acquisition, and rapid disassembly and completion, the ground-penetrating radar inspection of operating railway tunnels eliminates the need for manual antenna handling. This ensures that the antenna remains in close contact with the lining surface throughout the inspection process, obtaining continuous, stable, and high-precision inspection data. It also significantly reduces the labor intensity of operators and the safety risks of trackside operations. Furthermore, it can flexibly adapt to the operational needs of tunnels with different cross-sectional dimensions, different types of radar antennas, and different inspection locations such as arches and sidewalls. Attached Figure Description

[0043] This specification will be further described by way of exemplary embodiments, which will be described in detail with reference to the accompanying drawings. These embodiments are not limiting; in these embodiments, the same reference numerals denote the same structures, wherein:

[0044] Figure 1 This is a schematic diagram of the overall structure of a ground-penetrating radar detection bracket for an operating railway tunnel, as shown in some embodiments of this specification.

[0045] Figure 2 This is a top view of the clamping mechanism shown in some embodiments of this specification;

[0046] Figure 3 yes Figure 2 Side view in the AA direction;

[0047] Figure 4 yes Figure 2 Side view in the middle BB direction;

[0048] Figure 5 These are schematic diagrams of the rubber wheel structure shown in some embodiments of this specification;

[0049] Figure 6 This is a schematic diagram of the support telescopic rod device shown in some embodiments of this specification;

[0050] Figure 7 for Figure 1 A cross-sectional view of the magnetic base in the CC direction.

[0051] Reference numerals: 1. Clamping mechanism; 11. Rubber damping wheel; 12. Main structural beam; 13. Diagonal bracing elastic mechanism; 14. Diagonal brace; 15. Universal joint mechanism; 16. Ground-penetrating radar antenna limiting device; 2. Support telescopic rod device; 21. Upper support rod; 211. Force transmission mechanism; 212. Telescopic guide rail control mechanism; 22. Gear fixing device; 23. Lower support rod; 3. Magnetic base; 31. Non-magnetic body; 32. Magnetic body; 33. Magnetic body. Detailed Implementation

[0052] To more clearly illustrate the technical solutions of the embodiments in this specification, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are merely some examples or embodiments of this specification. For those skilled in the art, these drawings can be applied to other similar scenarios without creative effort. Unless obvious from the context or otherwise specified, the same reference numerals in the drawings represent the same structures or operations.

[0053] It should be understood that the terms “system,” “device,” “unit,” and / or “module” used herein are one way to distinguish different components, elements, parts, sections, or assemblies at different levels. However, if other terms can achieve the same purpose, they may be replaced by other expressions.

[0054] As indicated in this specification and claims, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" do not specifically refer to the singular and may also include the plural. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements.

[0055] Flowcharts are used in this specification to illustrate the operations performed by the system according to embodiments of this specification. It should be understood that the preceding or following operations are not necessarily performed in exact order. Instead, the steps can be processed in reverse order or simultaneously. Furthermore, other operations can be added to these processes, or one or more steps can be removed from them.

[0056] like Figure 1-7 As shown, one or more embodiments of this specification provide a ground-penetrating radar detection bracket for operating railway tunnels, including a clamping mechanism 1, a support telescopic rod device 2, and a magnetic base 3;

[0057] The clamping mechanism 1 is connected to the upper support rod 21 of the support telescopic rod device 2 via a universal joint mechanism 15;

[0058] The telescopic support rod device 2 includes an upper support rod 21 with a guide rail, a gear fixing device 22, and a lower support rod 23. The gear fixing device 22 is fixed to the lower support rod 23 and connected to the guide rail of the upper support rod 21 to adjust the length of the telescopic support rod device 2.

[0059] The bottom of the lower support rod 23 is fixedly connected to the magnetic base 3.

[0060] When in use, first fix the magnetic base 3 in the preset position of the metal working platform such as the railcar or the power grid maintenance vehicle to provide a stable bearing foundation for the entire bracket and prevent the bracket from shifting or shaking during the testing process.

[0061] The bottom of the lower support rod 23 of the support telescopic rod device 2 is fixedly connected to the magnetic base 3 to ensure the overall stability of the support structure. When it is necessary to adapt to the detection height of different tunnel sections, the gear fixing device 22 fixed on the lower support rod 23 is operated. Through the meshing of the gear fixing device 22 with the guide rail of the upper support rod 21, the upper support rod 21 is driven to slide axially, thereby adjusting the overall length of the support telescopic rod device 2. This allows the clamping mechanism 1 connected to the top of the upper support rod 21 to reach the corresponding detection height, meeting the height requirements of different detection positions such as the arch and sidewall.

[0062] The clamping mechanism 1 is used to fix the ground-penetrating radar antenna. It is connected to the upper support rod 21 through the universal joint mechanism 15, so that the clamping mechanism 1 can make multi-directional angle adaptive adjustment according to the undulation of the tunnel lining surface, ensuring that the ground-penetrating radar antenna is always in close contact with the lining detection surface. As the working platform moves forward at a constant speed along the tunnel track, it can continuously and stably collect detection data, replacing the traditional manual hand operation method and avoiding the problems of unstable antenna contact and poor data continuity caused by manual operation.

[0063] By combining the clamping mechanism 1, the adjustable length support telescopic rod device 2, and the magnetic base 3 with the movable connection structure of the universal joint, the operation of the railway tunnel geological radar detection eliminates the need for manual operation of the antenna. It can adapt to the detection needs of tunnels with different cross sections and various operating platforms, effectively ensuring the continuous and stable detection data, while reducing operational safety hazards and improving detection efficiency.

[0064] In some embodiments, the clamping mechanism 1 includes a rubber damping wheel 11, a structural main beam 12, an elastic bracing mechanism 13, a bracing 14, a universal joint mechanism 15, and a ground-penetrating radar antenna limiting device 16. The rubber damping wheel 11, the elastic bracing mechanism 13, the bracing 14, and the ground-penetrating radar antenna limiting device 16 are all disposed on the structural main beam 12.

[0065] The rubber damping wheel 11 is a wheel-shaped component with damping characteristics, mounted on the main structural beam 12, whose surface can fit against the surface of the ground-penetrating radar antenna, and which can rotate around its own central axis to ensure smooth antenna movement. The main structural beam 12 is the main load-bearing structure of the clamping mechanism 1, used to install and fix the rubber damping wheel 11, the inclined elastic mechanism 13, the inclined brace 14, and the ground-penetrating radar antenna limiting device 16. The main structural beam 12 serves as the overall load-bearing base of the clamping mechanism 1, and the rubber damping wheel 11, the inclined elastic mechanism 13, the inclined brace 14, the ground-penetrating radar antenna limiting device 16, and the universal joint mechanism 15 are all integrated and installed on the main structural beam 12, forming an independent clamping functional unit.

[0066] During antenna fixing, the ground-penetrating radar antenna is placed within the accommodating space formed by multiple sets of rubber damping wheels 11, ensuring that the two side surfaces of the antenna are in contact with the wheel surfaces of the corresponding rubber damping wheels 11. The installation position and pre-tightening force of the diagonal brace elastic mechanism 13 are adjusted according to the antenna's size specifications. The tension is transmitted through the diagonal brace 14 hinged to the rubber damping wheels 11, providing a clamping force towards the antenna to the rubber damping wheels 11. This ensures that the multiple sets of rubber damping wheels 11 evenly clamp the antenna, achieving adaptive fixing for antennas of different sizes. After installation, the ground-penetrating radar antenna limiting device 16 located at the forward end of the clamping mechanism 1 will lock onto the forward end face of the antenna, preventing axial movement of the antenna due to the frictional force of the lining during subsequent testing, thus ensuring the accuracy of the antenna's detection position.

[0067] The clamping mechanism 1 is connected to the upper support rod 21 of the support telescopic rod device 2 through the universal joint mechanism 15. It can drive the clamped antenna to swing freely in any direction within a preset angle range. During the detection process, it can adaptively adjust its posture according to the undulation of the tunnel lining surface to ensure that the antenna is always in close contact with the lining detection surface.

[0068] During the inspection operation, as the work platform moves along the tunnel track, the rubber damping wheel 11 can rotate freely around its central axis, converting the sliding friction generated by the relative movement of the antenna and the lining surface into rolling friction. This reduces movement resistance and antenna surface wear, while preventing excessive friction from causing the antenna to shift, thus ensuring the stability of the inspection process. By integrating the rubber damping wheel 11, the inclined brace elastic mechanism 13, the inclined brace 14, the ground-penetrating radar antenna limiting device 16, and the universal joint mechanism 15 onto the main structural beam 12, the clamping mechanism 1 becomes an independently detachable clamping functional unit. This allows it to accommodate ground-penetrating radar antennas of various sizes and facilitates rapid on-site assembly and maintenance, improving the preparation efficiency of the inspection operation.

[0069] In some embodiments, the rubber damping wheel 11 rotates around a central axis and fits against the surface of the ground-penetrating radar antenna.

[0070] In actual use, when the ground-penetrating radar antenna is placed into the accommodating space of the clamping mechanism 1, the wheel surface of the rubber damping wheel 11 directly contacts the side surface of the ground-penetrating radar antenna, providing stable lateral clamping support for the antenna. When the working platform drives the support to move along the tunnel track to carry out detection, the force generated by the contact between the antenna and the lining surface will be transmitted to the contacting rubber damping wheel 11. The rubber damping wheel 11 can rotate smoothly around its own central axis, converting the sliding friction at the contact position between the antenna and the damping wheel into rolling friction. This reduces the resistance during the antenna movement and reduces the friction loss of the antenna shell. At the same time, the damping characteristics of the rubber material can prevent unnecessary movement of the antenna when subjected to external forces, ensuring the stability of the antenna clamping state.

[0071] In some embodiments, the diagonal bracing elastic mechanism 13 is composed of a longitudinal tie rod and a spring. The main structural beam 12 is provided with a plurality of adjustment holes. The diagonal bracing elastic mechanism 13 is detachably installed on the adjustment holes for adjusting the clamping force.

[0072] The longitudinal tie rod is a rod-shaped force transmission component that is arranged along the length of the main beam 12 of the structure, used to connect springs and fix the diagonal bracing elastic mechanism 13 to the main beam 12 of the structure; the adjustment hole is a through hole that is opened at intervals along the length of the main beam 12 of the structure, allowing the diagonal bracing elastic mechanism 13 to select different installation positions to adjust the clamping force.

[0073] In practical applications, the adjustment hole position on the main beam 12 can be pre-selected according to the external dimensions of the ground-penetrating radar antenna to be clamped and the required clamping force. The inclined bracing elastic mechanism 13, which is composed of longitudinal tie rods and springs, can be detachably installed at the selected adjustment hole position.

[0074] One end of the longitudinal tie rod of the inclined brace elastic mechanism 13 is connected to the inclined brace 14 at the corresponding position, and the other end is fixedly assembled with the adjustment hole through the spring. The pre-tightening force generated by the spring can be transmitted to the inclined brace 14 through the longitudinal tie rod, thereby driving the inclined brace 14 to drive the rubber damping wheel 11 to fit tightly against the side surface of the ground radar antenna, providing a stable clamping force for the antenna.

[0075] When a greater clamping force is required, the inclined support elastic mechanism 13 can be installed in an adjustment hole further away from the clamping center. By increasing the spring's tensile deformation, the pre-tightening force is increased, thereby increasing the clamping force. When adapting to a smaller antenna or when a reduced clamping force is required, the inclined support elastic mechanism 13 can be installed in an adjustment hole closer to the clamping center. By reducing the spring's tensile deformation, the pre-tightening force is reduced, preventing excessive clamping force from damaging the antenna housing. This allows for flexible adjustment of the clamping force under different clamping requirements.

[0076] By setting multiple adjustment holes on the main structural beam 12 for the disassembly and installation of the diagonal bracing elastic mechanism 13, it is possible to flexibly adapt to the clamping force requirements of different sizes and models of ground-penetrating radar antennas, ensuring stable antenna clamping while avoiding excessive clamping force that could damage the antenna housing.

[0077] In some embodiments, one end of the diagonal brace 14 is hinged to the rubber damping wheel 11, and the other end is connected to the main structural beam 12, for transmitting the frictional force of the rubber damping wheel 11 and the tension of the diagonal brace elastic mechanism 13.

[0078] In practical applications, one end of the diagonal brace 14 is hinged to the rubber damping wheel 11, allowing the rubber damping wheel 11 to have a small range of movement to adapt to the shape of the ground-penetrating radar antenna. The other end is connected to the main structural beam 12 to form a stable force-bearing fulcrum. This not only evenly transmits the tension output by the diagonal brace elastic mechanism 13 to the rubber damping wheel 11, making the wheel surface of the rubber damping wheel 11 evenly press against the side surface of the ground-penetrating radar antenna, avoiding antenna loosening and displacement caused by insufficient local pressing force, but also smoothly transmits the frictional force of antenna movement on the rubber damping wheel 11 during the detection process to the main structural beam 12, preventing the rubber damping wheel 11 from swaying under force, and preventing jamming and uneven wear of the rubber damping wheel 11. This ensures the antenna clamping firmness while extending the service life of the rubber damping wheel 11.

[0079] In some embodiments, the ground-penetrating radar antenna limiting device 16 has an L-shaped structure and is located at the forward direction end of the clamping mechanism 1.

[0080] In practical applications, the L-shaped ground-penetrating radar antenna limiting device 16 is fixed at the forward direction end of the clamping mechanism 1. When the clamping mechanism 1 fixes the ground-penetrating radar antenna and moves along the tunnel track with the working platform, the reverse friction force generated by the antenna contacting the tunnel lining surface will cause the antenna to tend to move towards the rear of the clamping mechanism 1. At this time, the vertical blocking part of the L-shaped limiting device just abuts against the front end of the antenna, directly preventing the antenna from axially displacing. There is no need to add additional straps, buckles or other auxiliary fixing structures, which simplifies the antenna disassembly and assembly steps. At the same time, it can ensure that the antenna installation position is always consistent with the preset detection position, further improving the stability of the antenna fixation and avoiding interference from antenna displacement to the detection operation.

[0081] In some embodiments, the universal joint 15 includes a driving fork, a driven fork, a cross shaft, and a needle roller bearing;

[0082] The active fork is rigidly connected to the main structural beam 12, and the driven fork is rigidly connected to the upper support rod 21;

[0083] The cross shaft has two pairs of mutually perpendicular journals, and the needle roller bearing is installed between the journals of the cross shaft and the universal joint fork hole.

[0084] The driving fork and the driven fork are used to swing relative to each other in any plane around the center of the cross axis, with the swing angle ranging from 45° to 50°.

[0085] The driving fork is a universal joint connector that is rigidly connected to the main beam 12 of the clamping mechanism 1 and can swing synchronously with the clamping mechanism 1; the driven fork is a universal joint connector that is rigidly connected to the upper support rod 21 and provides support for the swing of the driving fork; the cross shaft is a universal joint core connecting component with two pairs of mutually perpendicular journals that pass through the corresponding holes of the driving fork and the driven fork to achieve multi-angle relative rotation between the two; the needle roller bearing is a bearing component installed between the journal of the cross shaft and the universal joint fork hole to reduce the rotational frictional resistance between the cross shaft and the driving fork and the driven fork; the universal joint fork hole is a through hole structure opened on the driving fork and the driven fork to fit and install the journal of the cross shaft; the swing angle is the maximum deflection angle allowed between the central axis of the driving fork and the central axis of the driven fork.

[0086] In practical applications, the active fork of the universal joint mechanism 15 is rigidly connected to the main structural beam 12 of the clamping mechanism 1, and the driven fork is rigidly connected to the upper support rod 21 of the support telescopic rod device 2. The two pairs of mutually perpendicular journals of the cross shaft are matched with the fork holes of the active and driven forks. The needle roller bearing is installed between the journal of the cross shaft and the corresponding fork hole, which can greatly reduce the frictional resistance during rotation and ensure the smoothness of angle adjustment.

[0087] When the tunnel lining surface undulates during the inspection process, the ground-penetrating radar antenna attached to the lining surface will cause the clamping mechanism 1 to deflect at an angle according to the shape of the lining. At this time, the active fork swings around the center of the cross axis together with the main beam 12 of the structure, while the driven fork remains relatively fixed with the upper support rod 21. This allows the active and driven forks to swing relative to each other in any plane. The swing angle can be flexibly adjusted within the range of 45°-50°, which can not only adapt to the angle installation requirements of different inspection positions such as the arch and sidewall, but also automatically adjust the orientation of the clamping mechanism 1 according to the height changes of the lining surface during the movement of the work platform. This ensures that the ground-penetrating radar antenna is always in close contact with the lining surface, avoiding the antenna from being suspended from the inspection surface or damaged by excessive force due to lining undulations, and effectively ensuring the continuity and accuracy of the inspection data.

[0088] With the matching structure of the universal ten-element and the limitation of the swing angle range of 45°-50°, the detection bracket can be flexibly adapted to the installation requirements of different detection positions such as tunnel arch and sidewall. It can ensure that the antenna is always in contact with the lining surface without repeated manual adjustments, effectively improving the efficiency of detection operations and the quality of data acquisition.

[0089] In some embodiments, the upper support rod 21 includes a force transmission mechanism 211 and a telescopic guide rail control mechanism 212. The telescopic guide rail control mechanism 212 meshes with the gear fixing device 22. The gear fixing device 22 is provided with an adjustment knob, which is connected to a gear. The adjustment knob is used to drive the gear to rotate by rotating the adjustment knob, thereby causing the guide rail of the upper support rod 21 to slide.

[0090] The force transmission mechanism 211 is a rigid load-bearing component on the upper support rod 21 that receives the external force transmitted by the clamping mechanism 1 and transmits it to the lower support rod 23, ensuring the overall force balance of the support structure. The telescopic guide rail control mechanism 212 is a guide rail component on the upper support rod 21 that is arranged along the axial direction of the rod body and has continuous meshing teeth on the side that are adapted to the gear, used to cooperate with the gear rotation to achieve axial displacement. The gear fixing device 22 is a fixed seat structure that is fixedly installed on the top of the lower support rod 23, has a transmission gear inside, and is used to provide guidance and transmission support for the extension and retraction of the upper support rod 21. The adjustment knob is an operating component exposed on the outer surface of the gear fixing device 22, rigidly connected to the internal transmission gear, and is rotated by the operator to input the extension and retraction adjustment power. The guide rail sliding is the extension and retraction action of the upper support rod 21 reciprocating linear motion relative to the lower support rod 23 along its own axial direction under the action of the gear meshing driving force.

[0091] In practical applications, this part of the structure is used to achieve precise adjustment of the length of the support telescopic rod device 2, so as to adapt to the detection height requirements of different locations such as the arch and sidewalls of tunnels with different cross-sectional dimensions.

[0092] The gear fixing device 22 is rigidly fixed to the outer side of the top of the lower support rod 23 in advance. The gear installed inside it meshes with the telescopic guide rail control mechanism 212 (toothed guide rail structure) of the upper support rod 21. The adjustment knob extends out of the gear fixing device 22 and is rigidly connected to the gear. The lower half of the upper support rod 21 passes through the internal cavity of the lower support rod 23 and can slide axially. The force transmission mechanism 211 of the upper support rod 21 bears the load of the upper clamping mechanism 1 and the ground radar antenna and transmits it downward stably.

[0093] When the support height needs to be adjusted, the operator rotates the adjustment knob, which drives the rigidly connected gear to rotate synchronously. The gear, through the toothed meshing with the telescopic guide rail control mechanism 212, converts its rotational motion into a linear driving force along the axial direction of the upper support rod 21, causing the upper support rod 21 to slide upward or downward along the axial direction of the lower support rod 23, thereby adjusting the overall length of the support telescopic rod device 2. When the ground-penetrating radar antenna is completely in contact with the tunnel lining detection surface, the adjustment knob is stopped. The meshing structure between the gear and the telescopic guide rail control mechanism 212 has a self-locking capability, which can maintain the current support length unchanged. The force transmission mechanism 211 of the upper support rod 21 evenly transmits the force borne by the upper structure to the lower support rod 23, ensuring the stability of the entire support structure, preventing the support length from shifting during the detection operation, and ensuring that the antenna is always in close contact with the lining surface.

[0094] The structure design of the upper support rod 21 with meshing teeth guide rail and gear fixing device 22 adjustment knob makes the length of the support telescopic rod device 2 easy and precise to adjust, adapting to the detection height requirements of different cross-section tunnels. After adjustment, the support state can be stably locked to avoid the support height from shifting during operation, effectively ensuring the fit between the ground radar antenna and the lining surface.

[0095] In some embodiments, the magnetic base 3 includes a non-magnetic body 31, a magnetic body, and a magnetic body; the magnetic body is a rotatable bar permanent magnet disposed at the internal center of the magnetic base 3; the non-magnetic body 31 is disposed between the magnetic body and the magnetic body; the magnetic body is the external base structure of the magnetic base 3, and the magnetic body is made of soft magnetic material; the magnetic base 3 is provided with a rotating handle, which is connected to the magnetic body to realize the rotation of the magnetic body.

[0096] The non-magnetic body 31 is a non-magnetic material component located inside the magnetic base 3, between the magnetic body and the magnetic guide body, used to block the magnetic circuit in the non-working state to prevent magnetic leakage. The magnetic guide body is a soft magnetic component that constitutes the external base structure of the magnetic base 3, made of soft magnetic material, used to form a closed magnetic circuit with the metal working platform being attracted when the magnetic poles of the magnetic body are arranged vertically to generate an attraction force. The magnetic body is a bar-shaped permanent magnet component located at the center of the magnetic base 3, which can be rotated in a controlled manner, used to switch the attraction and non-attraction states of the magnetic base 3 by adjusting the orientation of the magnetic poles through its own rotation. The soft magnetic material is a magnetic material with low remanence, which is easily magnetized and demagnetized, used to make the magnetic guide body to achieve rapid switching of the attraction state of the magnetic base 3.

[0097] In practical applications, the magnetic base 3 can quickly achieve adsorption and fixation or disassembly and release with the metal work platform by switching the internal magnetic circuit path.

[0098] When the base needs to be fixed, the operator turns the handle to rotate the internal bar magnet synchronously until the N and S poles of the magnet are vertically aligned. At this time, the magnetic lines of force generated by the magnet penetrate downward through the bottom magnetic conductor and form a closed magnetic circuit with the surface of the metal working platform below. After the soft magnetic conductor is magnetized, it generates a strong magnetic attraction force, which can firmly attach the entire base to the metal working platform such as the railcar or the power grid maintenance vehicle. The non-magnetic conductor 31 blocks the magnetic path between the side of the magnet and the magnetic conductor, ensuring that the magnetic lines of force are concentrated and conducted in the upward and downward directions, avoiding magnetic leakage and loss, and improving the adsorption stability.

[0099] When the base needs to be disassembled, the operator rotates the handle in the opposite direction, causing the magnetic body to rotate until the N and S poles are horizontal. At this time, the magnetic lines of force form a closed loop inside the base: starting from the N pole of the magnetic body, passing through the magnetic conductor on the side, and returning to the S pole. The non-magnetic conductor 31 blocks the magnetic path in the vertical direction, and the magnetic lines of force will not be conducted outward to the metal working platform below. The base has no obvious magnetic attraction to the outside, so it can be easily removed from the working platform. The entire adsorption and release process does not require additional installation tools, is easy to operate, and the magnetic attraction is stable in the adsorption state. It will not loosen due to vibration during operation, which can effectively ensure the overall stability of the bracket during the testing process.

[0100] The magnetic base 3 with rotation control structure allows the testing bracket to be quickly fixed and disassembled on the metal work platform without additional installation tools. In the fixed state, it provides stable support without displacement, effectively improving the efficiency of on-site testing and the stability of the bracket during the testing process.

[0101] One or more embodiments of this specification also provide a method for detecting ground-penetrating radar in operating railway tunnels, including the following steps:

[0102] S1. Place the ground-penetrating radar antenna in the clamping mechanism 1 so that the antenna is in contact with the surface of the rubber damping wheel 11. Use the ground-penetrating radar antenna limiting device 16 to limit the antenna axially. According to the antenna size and clamping requirements, install the inclined bracing elastic mechanism 13 in the corresponding hole of the main beam 12 and adjust the spring tension.

[0103] S2. Use fixing screws to connect the driven fork of the universal joint mechanism 15 to the top of the upper support rod 21 of the support telescopic rod device 2, and adjust the swing angle of the universal joint mechanism 15 so that the clamping mechanism 1 can rotate freely in the front, back and left and right.

[0104] S3. Place the magnetic base 3 in the desired position on the metal work platform, rotate the external handle on the magnetic base 3 to rotate the magnetic body to the up and down direction of the two poles, so that the magnetic base 3 is firmly attached to the work platform.

[0105] S4. Fix the bottom of the lower support rod 23 of the support telescopic rod device 2 into the fixed seat of the magnetic base 3, check the connection strength, and ensure that the support telescopic rod device 2 and the magnetic base 3 are not loose.

[0106] S5. According to the tunnel cross-section size and detection height requirements, adjust the knob of the gear fixing device 22 on the rotating support telescopic rod device 2 to drive the gear to rotate, and drive the upper support rod 21 to slide up and down along the guide rail to adjust the overall length of the support telescopic rod device 2 until the ground radar antenna is closely attached to the tunnel lining detection surface.

[0107] S6. Propel the work platform along the tunnel track to conduct ground radar detection. During the detection process, the universal joint mechanism 15 automatically adjusts the angle according to the undulation of the tunnel lining surface, and the rubber damping wheel 11 rotates freely with the antenna to ensure that the antenna is always in close contact with the lining surface and completes continuous data acquisition.

[0108] S7. After the inspection is completed, rotate the gear fixing device 22 adjustment knob in the opposite direction to shorten the length of the support telescopic rod device 2, then rotate the external handle of the magnetic base 3 to drive the magnetic body to rotate to the horizontal direction of the two poles, release the magnetic adsorption, remove the inspection bracket from the work platform, disassemble the ground radar antenna, and complete the inspection operation.

[0109] During implementation, the first step is to clamp and fix the ground-penetrating radar antenna: place the ground-penetrating radar antenna into the accommodating space of the clamping mechanism 1, so that the antenna surface is in contact with multiple sets of rubber damping wheels 11. The L-shaped ground-penetrating radar antenna limiting device 16 located at the forward direction end of the clamping mechanism 1 blocks the antenna from the end to prevent axial movement of the antenna during subsequent testing. According to the size, weight and required clamping force of the antenna to be clamped, select the corresponding adjustment hole position on the main beam 12 to install the diagonal brace elastic mechanism 13, adjust the preload of the spring, and transmit the tension through the diagonal brace 14 to the rubber damping wheels 11, so that each set of rubber damping wheels 11 evenly presses the antenna surface, realizing the firm clamping of antennas of different specifications. The rubber damping wheels 11 can rotate freely around their own central axis, which can reduce the frictional resistance when the antenna moves with the working platform.

[0110] Next, the connection between the clamping mechanism 1 and the support structure is completed: the driven fork of the universal joint mechanism 15 is rigidly connected to the top of the upper support rod 21 of the support telescopic rod device 2 using fixing screws. The active fork of the universal joint mechanism 15 is fixed to the main beam 12 of the structure as one unit. The cross shaft, in conjunction with the needle roller bearing, allows the active fork and the driven fork to swing in multiple directions around the center of the cross shaft within a range of 45°-50°, ensuring that the clamping mechanism 1 can freely adjust its front-to-back and left-to-right angles according to external forces, and has the ability to adaptively detect surface undulations.

[0111] Then, the magnetic base is attached and fixed: the magnetic base 3 is placed in the preset installation position of the metal working platform such as the railcar or the power grid maintenance vehicle. The exposed rotating handle is turned to drive the bar permanent magnet in the center of the magnetic base 3 to rotate synchronously until the N and S poles of the magnetic body are vertically aligned. At this time, the magnetic lines of force generated by the magnetic body penetrate downward through the soft magnetic material of the magnetic conductor and form a closed magnetic circuit with the metal working platform below. After the soft magnetic conductor is magnetized, it generates a strong magnetic attraction force. The non-magnetic material 31 filled between the magnetic body and the magnetic conductor blocks the magnetic path on the side of the magnetic body, avoiding magnetic force leakage and loss, so that the magnetic base 3 is firmly attached to the working platform without the risk of loosening or displacement.

[0112] Next, complete the installation of the support structure: embed the bottom of the lower support rod 23 of the support telescopic rod device 2 into the fixed seat at the top of the magnetic base 3 and lock it. Check the tightness of each connection part to ensure that there is no relative wobbling between the support telescopic rod device 2 and the magnetic base 3, so as to provide stable support for the upper structure.

[0113] Next, the detection height is adjusted: according to the cross-sectional dimensions of the tunnel to be inspected and the height requirements of the detection position, the adjustment knob of the gear fixing device 22 on the support telescopic rod device 2 is rotated to drive the gear inside the gear fixing device 22 to rotate. The gear meshes with the telescopic guide rail control mechanism 212 of the upper support rod 21, thereby driving the upper support rod 21 to slide smoothly along the axial guide rail, and accurately adjusting the overall length of the support telescopic rod device 2 until the ground radar antenna fixed on the clamping mechanism 1 is completely and tightly attached to the detection surface of the tunnel lining. After the adjustment is completed, the meshing structure of the gear guide rail can automatically lock the support length to prevent the length from changing on its own during the operation.

[0114] The inspection work is then carried out: the metal working platform equipped with the inspection bracket is pushed forward at a constant speed along the tunnel track. If there are undulations on the surface of the tunnel lining during the inspection process, the universal joint mechanism 15 will automatically adjust the swing angle according to the height change of the inspection surface. With the free rotation of the rubber damping wheel 11, the antenna is prevented from being stuck by the protruding parts. At the same time, the antenna is always kept in close contact with the lining surface. The uniform clamping force transmitted by the diagonal brace 14 and the axial limit of the L-shaped limit device together ensure that the antenna does not shift or move, so as to achieve continuous and stable inspection data acquisition.

[0115] After the inspection is completed, disassembly is carried out: the adjustment knob of the gear fixing device 22 is rotated in the opposite direction to drive the gear to rotate in the opposite direction, which drives the upper support rod 21 to slide down along the guide rail, shortening the overall length of the support telescopic rod device 2 and allowing the antenna to detach from the tunnel lining surface; then the rotating handle of the magnetic base 3 is rotated in the opposite direction to drive the internal bar permanent magnet to rotate until the N and S poles are horizontal. At this time, the magnetic lines of force form a closed loop inside the magnetic base 3. The non-magnetic body 31 blocks the magnetic path in the vertical direction, and the magnetic lines of force will not be conducted to the metal working platform below. The magnetic base 3 has no external magnetic attraction, so the inspection bracket can be easily removed from the working platform. Then the ground radar antenna in the clamping mechanism 1 is disassembled to complete the entire inspection operation.

[0116] By completing a standardized workflow in sequence—including adapting and clamping the ground-penetrating radar antenna, connecting the clamping mechanism 1 to the support structure, quickly adsorbing and fixing the magnetic base 3, precisely adjusting the support height, performing follow-up detection and acquisition, and quickly disassembling and finishing—the ground-penetrating radar detection of operating railway tunnels eliminates the need for manual antenna handling. This ensures that the antenna remains in close contact with the lining surface throughout the detection process, acquiring continuous, stable, and high-precision detection data. It also significantly reduces the labor intensity of operators and the safety risks of working alongside the track. Furthermore, it can flexibly adapt to the operational needs of tunnels with different cross-sectional dimensions, different types of radar antennas, and different detection locations such as arches and sidewalls.

[0117] The basic concepts have been described above. Obviously, for those skilled in the art, the detailed disclosure above is merely illustrative and does not constitute a limitation of this specification. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and corrections to this specification. Such modifications, improvements, and corrections are suggested in this specification and therefore remain within the spirit and scope of the exemplary embodiments described herein.

[0118] Furthermore, this specification uses specific terms to describe embodiments thereof. For example, "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic associated with at least one embodiment of this specification. Therefore, it should be emphasized and noted that references to "an embodiment," "one embodiment," or "an alternative embodiment" in different locations throughout this specification do not necessarily refer to the same embodiment. Moreover, certain features, structures, or characteristics in one or more embodiments of this specification can be appropriately combined.

[0119] Furthermore, unless expressly stated in the claims, the order of processing elements and sequences, the use of numbers and letters, or other names described in this specification are not intended to limit the order of the processes and methods described herein. Although various examples have been discussed in the foregoing disclosure of some embodiments of the invention that are currently considered useful, it should be understood that such details are for illustrative purposes only, and the appended claims are not limited to the disclosed embodiments; rather, the claims are intended to cover all modifications and equivalent combinations that conform to the spirit and scope of the embodiments described herein. For example, while the system components described above can be implemented using hardware devices, they can also be implemented solely using software solutions, such as installing the described system on existing servers or mobile devices.

[0120] It should be understood that the embodiments described in this specification are merely illustrative of the principles of the embodiments described herein. Other variations may also fall within the scope of this specification. Therefore, alternative configurations of the embodiments described herein are intended to be consistent with the teachings of this specification, rather than as examples or limitations. Accordingly, the embodiments described herein are not limited to those explicitly introduced and described herein.

Claims

1. A ground-penetrating radar (GPR) support for operating railway tunnels, characterized in that, Includes a clamping mechanism, a support telescopic rod device, and a magnetic base; The clamping mechanism is connected to the upper support rod of the support telescopic rod device via a universal joint mechanism; The telescopic support rod device includes an upper support rod with a guide rail, a gear fixing device, and a lower support rod. The gear fixing device is fixed to the lower support rod and connected to the guide rail of the upper support rod to adjust the length of the telescopic support rod device. The bottom of the lower support rod is fixedly connected to the magnetic base.

2. The geological radar detection bracket for operating railway tunnels according to claim 1, characterized in that, The clamping mechanism includes a rubber damping wheel, a structural main beam, an elastic bracing mechanism, a bracing, a universal joint mechanism, and a ground-penetrating radar antenna limiting device. The rubber damping wheel, the elastic bracing mechanism, the bracing, and the ground-penetrating radar antenna limiting device are all mounted on the structural main beam.

3. The geological radar detection bracket for operating railway tunnels according to claim 2, characterized in that, The rubber damping wheel rotates around its central axis and comes into contact with the surface of the ground-penetrating radar antenna.

4. The geological radar detection bracket for operating railway tunnels according to claim 2, characterized in that, The diagonal bracing elastic mechanism consists of a longitudinal tie rod and a spring. The main beam of the structure is provided with multiple adjustment holes. The diagonal bracing elastic mechanism can be detachably installed on the adjustment holes for adjusting the clamping force.

5. The geological radar detection bracket for operating railway tunnels according to claim 2, characterized in that, One end of the diagonal brace is hinged to the rubber damping wheel, and the other end is connected to the main beam of the structure, which is used to transmit the friction force of the rubber damping wheel and the tension of the diagonal brace elastic mechanism.

6. The geological radar detection bracket for operating railway tunnels according to claim 2, characterized in that, The ground-penetrating radar antenna limiting device has an L-shaped structure and is located at the forward direction end of the clamping mechanism.

7. The geological radar detection bracket for operating railway tunnels according to claim 2, characterized in that, The universal joint mechanism includes an active fork, a driven fork, a cross shaft, and a needle roller bearing; The active fork is rigidly connected to the main structural beam, and the driven fork is rigidly connected to the upper support rod. The cross shaft has two pairs of mutually perpendicular journals, and the needle roller bearing is installed between the journals of the cross shaft and the universal joint fork hole. The driving fork and the driven fork are used to swing relative to each other in any plane around the center of the cross axis, with the swing angle ranging from 45° to 50°.

8. The geological radar detection bracket for operating railway tunnels according to claim 1, characterized in that, The upper support rod includes a force transmission mechanism and a telescopic guide rail control mechanism. The telescopic guide rail control mechanism meshes with the gear fixing device. The gear fixing device is provided with an adjustment knob, which is connected to the gear. The adjustment knob is used to drive the gear to rotate by rotating the adjustment knob, thereby causing the guide rail of the upper support rod to slide.

9. The geological radar detection bracket for operating railway tunnels according to claim 1, characterized in that, The magnetic base includes a non-magnetic body, a magnetic body, and a magnetic body; The magnetic body is a rotatable bar permanent magnet, located at the internal center of the magnetic base; The non-magnetic material is disposed between the magnetic material and the magnetic material; The magnetic conductor is the external base structure of the magnetic base, and the magnetic conductor is made of soft magnetic material; The magnetic base is equipped with a rotating handle, which is connected to the magnetic body to achieve the rotation of the magnetic body.

10. A method for detecting ground-penetrating radar in operating railway tunnels, characterized in that, Includes the following steps: S1. Place the ground-penetrating radar antenna in the clamping mechanism so that the antenna is in contact with the surface of the rubber damping wheel. Use the ground-penetrating radar antenna limiting device to limit the antenna axially. According to the antenna size and clamping requirements, install the inclined brace elastic mechanism in the corresponding hole of the main beam of the structure and adjust the spring tension. S2. Use fixing screws to connect the driven fork of the universal joint mechanism to the top of the upper support rod of the support telescopic rod device, and adjust the swing angle of the universal joint mechanism to allow the clamping mechanism to rotate freely in the front, back and left and right. S3. Place the magnetic base in the desired position on the metal work platform, rotate the external handle on the magnetic base to rotate the magnetic body to the up and down direction of the two poles, so that the magnetic base is firmly attached to the work platform. S4. Fix the bottom of the lower support rod of the telescopic support device into the fixed seat of the magnetic base, check the connection strength, and ensure that the telescopic support device and the magnetic base are not loose. S5. According to the tunnel cross-section dimensions and detection height requirements, rotate the gear fixing device adjustment knob on the rotating support telescopic rod device to drive the gear to rotate, which will cause the upper support rod to slide up and down along the guide rail, and adjust the overall length of the support telescopic rod device until the ground radar antenna is tightly attached to the tunnel lining detection surface. S6. Propel the work platform along the tunnel track to conduct ground radar detection. During the detection process, the universal joint mechanism automatically adjusts the angle according to the undulation of the tunnel lining surface. The rubber damping wheel rotates freely with the antenna to ensure that the antenna is always in close contact with the lining surface and completes continuous data acquisition. S7. After the inspection is completed, rotate the gear fixing device adjustment knob in the opposite direction to shorten the length of the support telescopic rod device. Then rotate the external handle of the magnetic base to drive the magnetic body to rotate to the horizontal direction of the two poles, release the magnetic adsorption, remove the inspection bracket from the work platform, disassemble the ground radar antenna, and complete the inspection operation.

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